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CA08104001E For more information, visit: www.eaton.com/consultants

September 2011

Contents

Power Circuit Breakers & Insulated-Case Circuit Breakers26

Sheet 26001

PowerC

ircuitB

reakers

&

Insulated-CaseCircuitBreakers

Power Circuit Breakers & Insulated-Case Circuit Breakers

Breaker Type Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.0-2

Magnum Product Family

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.1-1

Magnum DS Low Voltage Power Circuit Breakers . . . . . . . . . . . . . . . . . .

26.1-5

Magnum SB Insulated-Case Circuit Breakers . . . . . . . . . . . . . . . . . . . . . .

26.1-12

Breaker-Mounted Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.1-14

Trip Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.1-15

Technical and Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.1-21

Accessories and Peripheral Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.1-27

Series NRX Product Family

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.2-1

Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.2-1

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.2-2

Trip Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.2-4

Communications Adapter Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26.2-5

Specifications

See Eatons Product Specification Guide

, available on CD or on the Web.CSI Format: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 2010

Power Circuit BreakersMagnum DS and Series NRXPower Circuit Breakers . . . . . . . . . . . . . . . Section 16475 Section 26 28 11

Insulated Case Circuit BreakersMagnum SB and Series NRXInsulated-Case Circuit Breakers . . . . . . . . Section 16475 Section 26 28 11

Electronic Trip Units

. . . . . . . . . . . . . . . . . . . Section 16904 Section 26 28 50

Low Voltage Circuit Breakers

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Breaker Type Comparison

002

Summary of Differences Between Low Voltage Power Circuit Breakers,Insulated-Case Circuit Breakers and Molded-Case Circuit Breakers

There are two main classificationsof low voltage circuit breakersmolded-case circuit breakers and low

voltage power circuit breakers. AllUL

, NEMA

and ANSI standards arefor molded-case circuit breakers andlow voltage power circuit breakers.

The industry recognizes three types ofcircuit breakersmolded-case circuitbreakers (MCCB), insulated-case circuitbreakers (ICCB) and low voltage powercircuit breakers LVPCB). Insulated-casecircuit breakers are designed to meetthe standards for molded-case circuitbreakers.

Low voltage power circuit breakerscomply with the following standards:

ANSI Std. C37.16Preferred Ratings

ANSI Std. C37.17Trip Devices forLVPCB

ANSI Std. C37.50Test Procedures

IEEE

Std. C37.13LVPCB Used inEnclosures

UL 1066LVPCB

Molded-case circuit breakers andinsulated-case circuit breakers typicallycomply with the following standards:

UL 489MCCB

UL 489Molded-Case Switches(MCS)

NEMA AB1MCCB and MCS

NEMA AB3MCCB Application

Table 26.0-1. Breaker Type Comparison Chart

Description LVPCB

(Type Magnum DS and Series NRX)

ICCB

(Type Magnum SB and Series NRX)

MCCB

(QUICKLAG

/Series C

/Series G

)

Select tripshort-time rating

Selective trip over full range of faultcurrents up to interrupting rating(high short-time ratings)

Selective trip over partial range of faultcurrents within the interrupting rating(medium short-time ratings). Typicallyup to 35 kA

Selective trip over a smaller range of faultcurrents within the interrupting rating (lowshort-time ratings). Typically 1013 timesthe frame size

Operator type Types of operators: mechanicallyoperated and electrically operatedtwo-step stored energy

Types of operators: mechanicallyoperated and electrically operatedtwo-step stored energy

Types of operators: mechanically operatedover-center toggle or motor operator

Closing speed 5-cycle closing for electricallyoperated devices

5-cycle closing for electricallyoperated devices

Greater than 5-cycle closing for electricallyoperated devices

Mounting Available in drawout constructionpermitting racking to a distinct testposition and removal for maintenance

Available in drawout constructionpermitting racking to a distinct testposition and removal for maintenance

Typically fixed-mounted but largeframe sizes may be available in drawoutconstruction

Interrupting rating Interrupting duty at 635 Vac:42100 kA and current limitingwith or without fuses up to 200 kA

Interrupting duty at 508 Vac:35 150 kA

Interrupting duty at 480 Vac:22100 kA without fuses and up to200 kA with integral fuses or for current-limiting type

Current limiting Special current limiting types availablewith or without fuses up to 200 kA

Special current limiting types availablewithout fuses up to 150 kA

Current limiting available with and withoutfuses up to 200 kA

Relative cost Higher Medium Low

Availableframe sizes

Small number of frame sizes available.Typical 8006000A

Small number of frame sizes available.Typical 8006000A

Large number of frame sizes available.Typical 1002500A

Maintenance Extensive maintenance possible on allframe sizes

Limited maintenance possible on largerframe sizes

Very limited maintenance possible on largerframe sizes

Enclosure types Used in enclosures, MCCs,switchboards and switchgear

Used in enclosures, MCCsand switchboards

Used in enclosures, panelboards,switchboards, MCCs and control panels

Series ratings Not available in series ratings Not available in series ratings Available in series ratings

Enclosed rating 100% continuous current rated inits enclosure

80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosure

80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosure

Standards ANSI/IEEE C37UL 1066

NEMA AB1/AB3UL 489 or UL 1066

NEMA AB1/AB3UL 489

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Sheet 26

Low Voltage Power/Insulated-Case Circuit BreakersMagnum DS and SB

003

Magnum Low VoltagePower Circuit Breakersfor Global Application

Magnum low voltage power circuit

breakers enable comprehensivesolutions to meet and exceed theunique and wide-ranging require-ments of todays global powerdistribution systems. This powerfulcircuit breaker offering is designedfor ultimate custom configuration andapplication flexibility, with the needsof the power distribution equipmentuser and the electrical equipmentmanufacturer in mind.

Standards

Magnum DS circuit breakers meetor exceed all applicable requirementsof ANSI Standards C37.13, C37.17,

C37.50 and CSA.

See Tab 20

for ANSI/UL 1558low voltage drawout switchgearapplication considerations, includingsystem voltage and frequency,continuous current ratings, ambienttemperature, altitude, and otherunusual environmental andoperating conditions.

See Tab 21

for UL 891 switchboardapplication considerations,ratings and layouts.

Three Product Families

Magnum consists of three product families; each provides specific ratingfeatures and approvals to optimize performance when applied in powerdistribution equipment and custom enclosures:

Magnum DS Low Voltage Power Circuit Breakers

for ANSI/UL 1558 Rated Switchgear Applications

Up to 635 Vac

2006000A continuous

42200 kA interrupting

Magnum DS Low Voltage Power Circuit Breaker FamilyANSI Rated for Switchgear Applications

Magnum SB Low Voltage Insulated-Case Circuit Breakersfor UL 891 Switchboard Applications

Up to 635 Vac

2006000A continuous

50150 kA interrupting

Magnum SB Low Voltage Insulated-Case Circuit Breaker FamilyUL Rated for Switchboard Applications

Magnum IEC Rated Air Circuit Breakersfor IEC Rated Switchboard Applications

Up to 690 Vac

2006300A continuous

40105 kA I

cu

/I

cs

Magnum IEC Rated Low Voltage Air Circuit BreakerFamily for IEC Switchboard Applications

For more information on Magnum IECair circuit breakers, please visitwww.eaton.com/electrical

.
http://www.eaton.com/electricalhttp://www.eaton.com/electricalhttp://www.eaton.com/electricalhttp://www.eaton.com/electrical

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004

All Magnum Breaker TypesFeatures, Benefitsand Functions

Interruption ratings up to 200 kA

with current limiting performanceand low current let-through toreduce damaging energy to down-stream equipment at high faultlevels or with high short-timeratings for increased selectivity

Short-time ratings up to 100 kA

to maximize system coordinationand selectivity

Four physical frame sizes

(narrow, standard, doublenarrow and double) to promotebreaker application in compactmodular enclosures

Continuous current ratings from8006000A

with 100% rating at 40C

and no derating on most ratingsup to 50C in a properly sized andventilated enclosure

Fixed breaker mountingconfigurations

with horizontaland optional vertical and frontconnected terminal connections

Drawout breaker mountingconfigurations

with cassetteand optional safety shutters

Three- and four-pole breakerconfigurations

Through-the-door design

forhuman interface with the breakercompartment door closed

Two-step stored energy mechanism

for manually and electricallyoperated breakers

Digitrip RMS Trip Unit familyprotection

with four models eachproviding increasing levels ofprotection and feature optionsfor coordination, informationand diagnostics:

Microprocessor-based rms sensing

Basic to programmable over-current protection and alarms

Local display for information,status and diagnostics

Ampere, voltage andpower metering

Power quality, harmonicsand waveform capture

Communications with translatorsto common protocols

Zone selective interlocking forimproved coordination

Integral Arcflash ReductionMaintenance System

Breaker health monitoring

Field-installable accessories

(UL listed) common across thebreaker frames and designed tobe easily installed in the field toservice or modify the breaker atthe point of use

Secondary terminal contacts

mounted at the top front of thebreaker and away from the primaryvoltage areas for improved safetyand access. Finger-safe terminalblocks accommodate ring-tongue or

spade type terminals as standard

Through-the-Door Design for Human Interfacewith the Breaker Compartment Door Closed

High Technology Microprocessor-Based Digitrip RMS 1150+ Trip Unitsare Available with Advanced Features Like Programmable OvercurrentSettings, Power Metering, Power Quality and Communications

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005

Breaker Features onFront Cover

The controls and indicators arefunctionally grouped on the breakerfaceplate to optimize the human

interface, visibility and ease of use.For maximum safety, a modern,through-the-door design permitsaccess to the breaker levering system,trip unit, controls and indicators withthe door closed.

Mechanical trip flag pop-outindicator (optional)redInterlocked indicator requiringmanual reset is also available

Accessory viewing windows for:

Shunt Trip Attachment (STA)

Spring Release device (SR)

Undervoltage Release (UVR)device or second STA

Digitrip RMS trip unit (Model 520Mshown) protected by clear cover

Contact status indicators:

OPENgreen

CLOSEDred

Spring status indicators:

Chargedyellow

Dischargedwhite

Push OFF (open) pushbuttonred

Push ON (close) pushbuttongreen

Manual spring charging handlefor manually charging the storedenergy springs

Mechanical operationscounter (optional)

Key off lock (optional)

Padlockable levering deviceshutter for drawout breakers

Color-coded position indicatorfor drawout breakers:

CONNECTred

TESTyellow DISCONNECTgreen

Magnum DS Drawout Breaker

Accessory Viewing Windows VisiblyConfirm the Breaker Shunt Trip,Spring Release, UVR Installationand Their Control Voltage Rating

Through-the-Door Design for HumanInterface with the Breaker CompartmentDoor Closed, for Example, ManuallyCharging the Stored Energy Springs

Drawout Breaker Levering Can beAccomplished with the CompartmentDoor Closed without the Need for aSpecial Levering Tool

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Low Voltage Power/Insulated-Case Circuit BreakersMagnum DS and SB006

Breaker Internal Features

Magnum circuit breakers are designedfor ease of access for inspection,modification and maintenance at thepoint of use. The breaker front cover

is easily removed with four captivebolts, revealing the modular internalbreaker features.

Secondary terminal points forinternal standardized breakerwiring connections

Breaker accessory mounting deckwith three positions for mounting:

Shunt Trip Attachment (STA)

Spring Release device (SR)

Undervoltage Release (UVR)device or second STA

Digitrip RMS Trip Unit

(Model 1150+ shown) Spring charging motor (optional)

for electrically charging the storedenergy springs

Manual spring charging handlefor manually charging the storedenergy springs

Padlockable levering deviceshutter for drawout breakers

Color-coded position indicator fordrawout breakers:

CONNECTred

TESTyellow

DISCONNECTgreen

Secondary contact blocks forconnection to external cellcontrol wiring

Removable arc chute covers for easyaccess to breaker main contacts

Primary finger cluster disconnect-ing contacts for drawout breakerare mounted on the breakerelement for ease of access forinspection and maintenance

Note: Some competitors mount the primaryfinger clusters inside the cell, requiring

shutdown of the switchgear for inspectionand maintenance.

Current sensor viewing windowsto view and confirm breakersensor rating

Rigid frame housing (thermosetcomposite resin) providingincreased strength and durability

Magnum Drawout Breaker Front View with Front Cover RemovedShowing Easy Access to the Breaker Internal Devices

Magnum Drawout Breaker Rear View Showing Primary DisconnectingFinger Clusters Mounted on the Breaker for Ease of Inspection

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Sheet 26

Power Circuit Breakers

Magnum DS Low Voltage Power Circuit Breakers007

Magnum DS Low VoltagePower Circuit BreakersMagnum DS is a true UL 1066 listedlow voltage power circuit breakerfamily, designed for the highest

performance requirements ofswitchgear and specialtyenclosure applications.

Magnum DS low voltage powercircuit breakers have short-timewithstand and interruption ratingsup to 100 kA at 635 Vac withcontinuous current ratings upto 6000A to maximize systemcoordination and selectivity

Magnum MDDX non-currentlimiting PCBs have 200 kAinterrupting ratings and up to100 kA short-time rating at 508 Vacwith continuous current ratings upto 6000A

Magnum MDSX current limitingpower circuit breakers (fuseless)have 200 kA interrupting ratingsand 3050 kA short-time ratingsat 480 Vac with continuous currentratings up to 5000A

Magnum MDSL current limitingpower circuit breakers with integralcurrent limiters (fuses) have 200 kAinterrupting ratings at 600 Vacwith continuous current ratingsup to 2000A

UL and ANSI TestCertificationsMagnum DS meets or exceeds theapplicable ANSI, NEMA, UL and CSAstandards, including:

ANSI C37.13 (low voltage AC powercircuit breakers used in enclosures)

ANSI C37.16 (preferred ratings,related requirements, andapplication recommendations forlow voltage power circuit breakersand AC power circuit breakers)

ANSI C37.17 (trip devices for ACand general purpose DC low voltagepower circuit breakers)

ANSI C37.50 (test proceduresfor low voltage AC power circuitbreakers used in enclosures)

UL 1066 (standard for low voltageAC and DC power circuit breakers

used in enclosures) NEMA SG3 (this standard adopts

ANSI C37.16 in its entirety)

ComprehensiveEnclosure SolutionsMagnum DS has proven performancein Eaton manufactured switchgearand switchboards with the following

test certifications: UL 1558 (Magnum DS low voltage

metal-enclosed switchgear)

UL 891 (Pow-R-LineC lowvoltage switchboards)

UL 1008 standard for transferswitch equipment

UL, CSA 22.2.31 low voltageassemblies

Approvals

UL listed: Magnum DS breakerUL File No. E52096 and cassetteUL File No. E204565

ABS (American Bureau of Shipping)Type Listed Certificate Number04-HS422844A-DUB

Magnum DS, MDSX and MDSL Circuit Breakers

Magnum DS low voltage power circuitbreakers have high withstand ratings

from 42 to 100 kA to provide for maximumsystem coordination and selectivity.

Magnum MDSX current limiting powercircuit breakers have fast opening

contacts to provide interrupting ratingsup to 200 kA at 508 Vac without fuses.

Magnum MDSL current limiting powercircuit breakers have integral current

limiters to provide interrupting ratingsof 200 kA at 600 Vac.

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Selecting the Optimal Magnum Solution for System Coordination,Interruption Performance and Arc Flash Reduction

Table 26.1-1. System Application Considerations

Magnum MDS, MDN and MDDXHigh Short-Time Current RatingBreakers for Maximum CoordinationMagnum MDS and MDDX breakers

are designed to hold in and carrytheir rated short-time current up to0.5 seconds, the maximum trip unitshort-time delay setting. Systemcoordination is maximized when theinstantaneous trip unit settings areeither turned off or set high enough tofacilitate coordination with other loadside protective devices in the circuit.

Energy let-through and arc flash energyto the downstream circuit can besignificantly reduced by employinginstantaneous trip unit settings, as wellas ground fault and zone interlocking.However, the desire to reduce arcflash may have to be balanced with the

necessity to maintain system coordina-tion and continuity. This is especiallytrue at the low fault levels characteristicof arcing faults, because the trip unitinstantaneous trip setting may have tobe set as low as the minimum setting,which could cause lack of coordination.

The integral Arcflash ReductionMaintenance System trip unit optioncan be employed to optimize arc flashreduction during system startup andmaintenance operations.

Magnum MDSX FuselessInterruption Up to 200 kA CurrentLimiting PerformanceMagnum MDSX breakers provide new

fuseless technology with interruptionratings up to 200 kA at 508 Vac. Theinterruption performance is currentlimiting when the fault currentsexceeds the short-time current rating.The self-protecting fast-openingreverse-loop contacts quickly open,clearing the fault in approximately1/4 cycle, reducing energy let-throughand arc flash energy.

Below their short-time current rating,MDSX breakers coordinate like standardMDS breakers. Arc flash levels to thedownstream circuit can be reducedbyemploying the trip unit instantaneoussettings as well as ground fault, zone

interlocking and Arcflash ReductionMaintenance System features.

MDSX breakers have the same compactfootprint as standard MDS breakers.

MDSX improves overall operatingsystem continuity, convenience and lifecycle costs by eliminating fuse trucks,blown limiter change outs, replacementlimiter inventories and the higheroperating watts loss associatedwith fuses.

Magnum MDSL Interruption Up to200 kA with Integral Current Limiters

Magnum MDSL breakers with integralcurrent limiters provide interruptionratings up to 200 kA at 600 Vac. MDSLis especially effective in reducingenergy let-through and arc flash at thehighest fault currents and those thatfall within the current limiting rangeof the current limiter. Interruption isclean and efficient with most of the arcdisplay contained within the currentlimiter. A wide array of current limiterratings are available for selection andapplication with the breaker currentsensor ratings and trip unit settingsto provide for system coordination.

When fault currents fall below thecurrent limiting range of the limiter,energy let-through and arc flash

energy will increase. In this range, alower rated current limiter may beapplied, but considerations must begiven to nuisance blowing of thelimiter and system coordination.

MDSL breakers can also employ tripunit instantaneous settings as well asground fault, zone interlocking andArcflash Reduction MaintenanceSystem features to reduce arc flashlevels. Physically, they are 6.00 inches(152.4 mm) deeper than standardconstruction Magnum breakers.

Magnum Breaker Type Short-TimeCurrent (See

Table 26.1-2)

SystemCoordination

Interruption Arc Flash Energy Operating SystemConvenience and

Life Time Cost

MDS and MDDXHigh short-timecurrentLS tripfunctions with trip unitinstantaneous off

Up to 65 kA(narrow frame)Up to 85 kA(standard frame)Up to 100 kA(double narrowand double frame)

Up to 100 kA Up to 100 kAat 635 VacMDS/MDNUp to 200 kAat 508 VacMDDX

Highest energy Inspect, reset andclose after interruption

MDSXCurrent limitingfastopening reverse loopcontacts with trip unitinstantaneous off

30 kA(standard frame)

50 kA(double frame)

Up to the ratedshort-timecurrent

Based on tripunit settings

200 kAat 508 Vac

Lower energy atfault levels in currentlimiting range aboveshort-time current rating

Inspect, reset andclose after interruption

MDSL

Current limiting integral currentlimiters with trip unitinstantaneous off

Based on current

limiter selected

Based on current

limiter selectedand trip unitsettings

Up to 200 kA

at 600 Vac

Lower energy at fault levels

in the current limiting rangeof current limiter

Blown limiters require

replacement and inventoryOperating watts lossis higher than fuse-lessbreakers

All Magnum breakerswith trip unit instantaneous on

Per Magnumbreaker typeapplied

Trip unit instanta-neous settingsaffect systemcoordination andcontinuity

Per Magnumbreaker typeapplied

May be reduced byemploying trip unit:

Ground fault settings,zone selective interlocking,Arcflash ReductionMaintenance System

Per Magnum breakertype applied

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Magnum DS Switchgear Class UL 1066

Magnum DS Low Voltage Power Circuit Breaker Family ANSI Rated for Switchgear Applications

Table 26.1-2. Magnum DS Switchgear Class UL 1066 Low Voltage Power Circuit Breakers

Interrupting ratings shown based on breaker equipped with integral Digitrip RMS trip unit. Interruption ratings for non-automatic breakers are equal to thepublished short-time withstand rating. These interruption ratings are based on the standard duty cycle consisting of an open operation, a 15-second inter-val and a close-open operation, in succession, with delayed tripping in case of short-delay devices. The standard duty cycle for short-time ratings consistsof maintaining the rated current for two periods of 1/2 seconds each, with a 15-second interval of zero current between the two periods.

Magnum MDSL current limiting power circuit breaker with integral current limiters. Current limiter selected determines short-time and fixedinstantaneous trip rating. Maximum voltage rating is 600 Vac.

Magnum MDSX fuseless current limiting power circuit breakers with fast opening contacts. SeeTable 26.1-1on Page 26.1-6for peak let-through chart. Product to be tested. Contact Eaton for product rating.

FrameAmperes

Breaker TypeCatalogNumber

FrameType

rms Symmetrical Current Ratings kA 50/60 Hz Available Current Sensorand Rating Plugs for DigitripRMS Trip Unit (EstablishesBreaker InRating)

Interruptingat 254 Vac



Short-TimeWithstandRating

Fixed InternalInstantaneousTrip

800 MDN-408MDN-508MDN-608MDN-C08

NarrowNarrowNarrowNarrow

42 50 65100

42 50 65100

42 50 65 65

42 50 65 20

18 x In

200, 250, 300, 400, 600, 800

MDS-408MDS-608MDS-808MDS-C08MDS-L08

StandardStandardStandardStandardStandard

42 65 85100200

42 65 85100200

42 65 85100200

42 65 85 85

85

1200 MDN-412MDN-512MDN-612

NarrowNarrowNarrow

42 50 65

42 50 65

42 50 65

42 50 65

200, 250, 300, 400, 600, 800,1000, 1200

MDS-412MDS-512MDS-612MDS-812MDS-C12MDS-X12

StandardStandardStandardStandardStandardStandard

42 50 65 85100200

42 50 65 85100200

42 50 65 85100 65

42 50 65 85 85 30

1600 MDN-416MDN-516

MDN-616MDN-C16

NarrowNarrow

NarrowNarrow

42 50

65100

42 50

65100

42 50

65 65

42 50

65 30

18 x In

200, 250, 300, 400, 600, 800,1000, 1200, 1600

MDS-616MDS-816MDS-C16MDS-L16

MDS-X16


65 85100200200

65 85100200200

65 85100200

65 85 85 30

8530

2000 MDN-620MDN-C20

NarrowNarrow

65100

65100

65 65

65 35

18 x In

200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000

MDS-620MDS-820MDS-C20MDS-L20

MDS-X20


65 85100200200

65 85100200200

65 85100200

65 85 85 30

8530

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Table 26.1-2. Magnum DS Switchgear Class UL 1066 Low Voltage Power Circuit Breakers (Continued)

Interrupting ratings shown based on breaker equipped with integral Digitrip RMS trip unit. Interruption ratings for non-automatic breakers are equal to thepublished short-time withstand rating. These interruption ratings are based on the standard duty cycle consisting of an open operation, a 15-second inter-val and a close-open operation, in succession, with delayed tripping in case of short-delay devices. The standard duty cycle for short-time ratings consistsof maintaining the rated current for two periods of 1/2 seconds each, with a 15-second interval of zero current between the two periods.

Magnum MDSL current limiting power circuit breaker with integral current limiters. Current limiter selected determines short-time and fixedinstantaneous trip rating. Maximum voltage rating is 600 Vac.

Product to be tested. Contact Eaton for product rating. Magnum MDSX fuseless current limiting power circuit breakers with fast opening contacts. SeeTable 26.1-1on Page 26.1-6for peak let-through chart. Breaker applied in a tested fan-cooled enclosure.

FrameAmperes


FrameType

rms Symmetrical Current Ratings kA 50/60 Hz Available Current Sensorand Rating Plugs for DigitripRMS Trip Unit (EstablishesBreaker InRating)




Short-TimeWithstandRating

Fixed InternalInstantaneousTrip

3200 MDS-632

MDS-832MDS-C32

Standard

StandardStandard

65

85100

65

85100

65

85100

65

85 85

85

200, 250, 300, 400, 600, 800,

1000, 1200, 1600, 2000, 2500,3000, 3200

MDS-X32 Double 200 200 50 50

4000 MDN-640MDN-840MDN-C40

Double narrowDouble narrowDouble narrow

65 85100

65 85100

65 65 65

65 85100

2000, 2500, 3200, 4000

MDS-840MDS-C40MDS-X40

MDD-X40

DoubleDoubleDoubleDouble

85100200200

85100200200

85100

100

85100 50100

50

5000 MDS-850MDS-C50MDS-X50

MDD-X50

DoubleDoubleDoubleDouble

85100200200

85100200200

85100

100

85100 50100

50

2500, 3200, 4000, 5000

6000 MDS-C60

MDD-X60DoubleDouble

100200

100200

100100

100100

3200, 4000, 5000, 60002500, 3200, 4000, 5000

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Magnum MDSXFuseless Current LimitingPower Circuit Breakers

Magnum MDSX

Magnum MDSX Current LimitingPower Circuit Breakers have fastopening contacts to provideinterrupting ratings up to 200 kAat 508 Vac without fuses. Theinterruption performance is currentlimiting when the fault currents exceedthe short-time current rating. The self-protecting fast opening reverse loopcontacts quickly open, clearing thefault in approximately 1/4 cycle,reducing energy let-through and arcflash energy. Below their short-timecurrent rating, MDSX breakerscoordinate like standard MDS breakers.

Arc flash levels to the downstreamcircuit can be reduced by employingthe trip unit instantaneous settings aswell as ground fault, zone interlocking,and Arcflash Reduction MaintenanceSystem features. MDSX breakers

have the same compact footprint asstandard MDS breakers. MDSXimproves overall operating systemcontinuity, convenience and life cyclecosts by eliminating fuse trucks, blownlimiter change outs, replacementlimiter inventories and the higheroperating watts loss associatedwith fuses.

Figure 26.1-1. Magnum Let-Through Data

1000

100

10

10,000 100,000

Ipeak(kA)

MagnumLet-Through

DataIpeak

1,000,000

AsymmetricalAvailable Peak 15%

PF

MDS-X50 5000AMDS-X40 4000AMDS-X32 3200A

MDS-X20 2000AMDS-X16 1600AMDS-X12 1200A

Available Fault Circuit Current (Amperes)

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Magnum MDSLFused Current LimitingPower Circuit Breakers

The following curves illustrate the ratings,

melting time-current characteristicsand current limiting, or let-throughcharacteristics, of limiters for Magnumlow voltage power circuit breakers.

The let-through current for a givenlimiter application is readily determinedby extending a vertical line from theapplicable maximum available sym-metrical fault amperes at the bottommargin to the characteristic line forthe particular limiter, and from thisintersection extending a horizontal lineto the left margin and reading the peakcurrent. The withstand rating of anycircuit elements protected by thelimiters should be at least equal to

this peak current.

It will be noted that the let-throughcurrent increases with the limiter sizeor ampere rating; in other words, themaximum current limiting effect isobtained with the smallest size. Thiseffect is to be expected, because theresistance decreases as the ratingincreases. If the vertical line from thebottom margin as described in theprevious paragraph does not intersectthe limiter characteristic line, the avail-able system fault current is below thethreshold current of that limiter, andit will offer no current limiting effect.

The current limiting principle isillustrated below:

la = The Available Peak Fault Current

tm = The Melting Time

Ip

= The Peak Let-Through Current

ta = The Arcing Time

tc = The Total Interrupting (Clearing)Time

Figure 26.1-2. Current Limiting

Limiter SelectionThe selection of a suitable limiterrating for a given application isgenerally governed by a choice ofthe following types of protection:

A. Maximum protection of down-stream components. Type MDSLbreakers are often used for thispurpose even when the maxi-mum available fault currents arewithin the interrupting ratingof the corresponding unfusedMagnum breakers.

B. Protection of the circuit breaker only.

Case A would tend to use the smallestavailable limiter; Case B the largest.When downstream protection isrequired, the selection is usuallya compromise, because certain smalllimiters cannot be coordinated with

the breaker to avoid nuisance blowingon overloads or small and moderateshort circuits.

Minimum, recommended andmaximum limiter sizes for MagnumMDSLbreakers are given in thetable below.

Table 26.1-3. Magnum MDSL Ratings

Table 26.1-4. Magnum MDSL Sensor/Rating Plug vs.Current Limiter Selection

Select the current limiter based on the Magnum breaker frame and current sensor and rating plug as shown. Refer to MDSL current limiter curves for let-through and time characteristics. The recommended ratings shown as shaded provide for reduced current let-through and breaker coordination within the trip unit settings.

Selection of current limiters below the recommended ratings shown provides lower current let-through; however, trip unit settings must beconsidered to avoid nuisance operation.

Ia

Ip

tc

tm ta

Frame Available Sensor/Rating Plug (Amperes)

CatalogNumber

800 200, 250, 300, 400, 600, 800 MDSL08

1600 200, 250, 300, 400, 600,800, 1000, 1200, 1600

MDSL16

2000 1600, 2000 MDSL20

Sensor andRating Plug In

MDSL Current Limiter Selection Chart

200 MA250 MA300 MA400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000

250 MA400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000

300 MA400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000

400 MA600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000

600 MA800 MB1200 MB1600 MB2000 MD2500 MD3000

800 MB1200 MB1600 MB2000 MD2500 MD3000

1000 MB1600 MB2000 MD2500 MD3000

1200 MB2000 MD2500 MD3000

1600 MD3000

2000 MD3000

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Figure 26.1-3. Type Magnum DSL Limiters, Peak Let-ThroughCurrent Characteristics

Figure 26.1-4. Type Magnum DSL Limiters Average MeltingTime-Current Characteristics

10090807060

50

40

30

20

1098765

4

3

2

1.9.8.7.6.5

.4

.3

.2

.1.09.08.07.06.05

.04

.03

.02

100

200

300

400

500

600700

800

900

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

20000

30000

40000

50000

60000

70000

80000

90000

100000

Pea

kIns

tan

taneous

Le

t-Throug

hCurren

tinKilo

Amper

es

X10

MD3000MD2500MD2000MD1600MD1200MA800

MA600

MA400MA300MA250

Available Current, rms Symmetrical Amperes x 10

1000900800700600500400

300

200

100908070605040

30

20

10987654

3

2

1.9.8.7.6.5.4

.3

.2

.1.09.08.07.06.05.04

.03

.02

.01

1 2 3 4

6 7 8 910 20

30

405060708090100

200

300

400500600700800900

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

5

TimeinSeconds

MA250

MA300

MA400

MA500

MA800

MB1200MB1600

MB2000

MB2500

MB3000

Current in Amperes x 100

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Insulated-Case Circuit Breakers

Magnum SB Insulated-Case Circuit Breakers014

Magnum SBLow Voltage Insulated-CaseCircuit Breakers

Magnum SB Low Voltage Insulated-CaseCircuit Breakers are Designed for thePerformance and Economic Requirementsof UL 891 Switchboards

Typical Magnum SB Low VoltageInsulated-Case Circuit Breaker Nameplate

Magnum SB is a low voltage insulated-case circuit breaker family designedfor the performance and economicrequirements of UL 891 switchboards.

Magnum SB insulated-case circuitbreakers have Interruption ratings

up to 100 kA at 635 Vac with contin-uous current ratings up to 6000A

Magnum SB insulated-case circuitbreakers have lighter-duty short-time current ratings and fixedinternal instantaneous trips onmost ratings, which is characteristicof UL 489 molded-case breakerscommonly used in UL 891 switch-boards. This provides for greatereconomy and excellent coordinationand selectivity for most commercialapplications

Fixed internal instantaneous tripsare included on all SB insulated-casecircuit breakers rated 3200A andbelow to provide an extra safetyfactor by reducing the energy let-through to downstream circuits atthe maximum instantaneous trippoint and to facilitate feeder circuitbreaker protection in UL 891 switch-boards with 3-cycle bus bracing

Magnum SBSE current limitingpower circuit breakers have 150 kAinterrupting ratings at 480 Vac withcontinuous current ratings up to5000A. The short-time current ratingis 30 kA for standard frame and50 kA for double frame breakers

UL and ANSI Test Certifications

Magnum SB meets or exceeds theapplicable ANSI, NEMA, UL and CSAstandards, including:

ANSI C37.13 (low voltage AC power

circuit breakers used in enclosures) ANSI C37.16 (preferred ratings,

related requirements, andapplication recommendations forlow voltage power circuit breakersand AC power circuit breakers)

ANSI C37.17 (trip devices for ACand general purpose DC low voltagepower circuit breakers)

ANSI C37.50 (test proceduresfor low voltage AC power circuitbreakers used in enclosures)

UL 1066 (standard for low voltageAC and DC power circuit breakersused in enclosures)

NEMA SG3 (this standard adoptsANSI C37.16 in its entirety)

ComprehensiveEnclosure Solutions

Magnum SB has proven performancein Eaton manufactured switchboardswith the following test certifications:

UL 891 (Drawout Magnum SBand Pow-R-Line C low voltageswitchboards)

UL, CSA 22.2.31 low voltageassemblies

Approvals

UL listed: Magnum SB breakerUL File E52096 and cassetteUL File E204565

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Insulated-Case Circuit Breakers

Magnum SB Insulated-Case Circuit Breakers015

Magnum SB Switchboard Class Insulated-Case

Magnum SB Low Voltage Insulated-Case Circuit Breaker Family UL Rated for Switchboard Applications

Table 26.1-5. Magnum SB Switchboard Class Insulated-Case Low Voltage Air Circuit Breakers

Interrupting ratings shown based on breaker equipped with integral Digitrip RMS trip unit. Interruption ratings for non-automatic breakers areequal to the published short-time withstand rating. These interruption ratings are based on the standard duty cycle consisting of an open operation,a 15-second interval and a close-open operation, in succession, with delayed tripping in case of short-delay devices. The standard duty cycle forshort-time ratings consists of maintaining the rated current for two periods of 1/2 seconds each, with a 15-second interval of zero current betweenthe two periods.

Product to be tested. Contact Eaton for product rating. Magnum SBSE Current Limiting Power Circuit Breaker with fast opening contacts. Breaker applied in a tested fan-cooled enclosure.

Note: Magnum SB is UL 1066 listed.

FrameAmperes


FrameType

rms Symmetrical Current Ratings kA 50/60 Hz Available Current Sensor andRating Plugs for DigitripRMS Trip Unit (EstablishesBreaker InRating)




Short-TimeWithstand Rating

Fixed InternalInstantaneous Trip

800 SBN-508SBN-608SBN-C08

NarrowNarrowNarrow

50 65100

50 65100

35 42 65

20 20 20

18 x In18 x In18 x In

200, 250, 300, 400, 600, 800

SBS-608SBS-C08

StandardStandard

65100

65100

65 85

20 20

18 x In18 x In

1200 SBN-512SBN-612SBN-C12

NarrowNarrowNarrow

50 65100

50 65100

35 42 65

25 25 25


200, 250, 300, 400, 600, 800,1000, 1200

SBS-612SBS-C12SBS-E12

StandardStandardStandard

65100200

65100150

65 85

25 25 30

18 x In18 x In30

1600 SBN-516SBN-616SBN-C16

NarrowNarrowNarrow

50 65100

50 65100

35 42 65

30 30 30


200, 250, 300, 400, 600, 800,1000, 1200, 1600



65100200

65100150

65 85

30 30 30

18 x In18 x In30

2000 SBN-620SBN-C20

NarrowNarrow

65100

65100

65 65

35 35

18 x In18 x In

200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000



65100200

65100150

65 85

35 35 30

18 x In18 x In30

2500 SBS-625SBS-C25

StandardStandard

65100

65100

65 85

45 45

18 x In18 x In

200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000, 2500

SBS-E25 Double 200 150 50 50

3000 SBS-630SBS-C30

StandardStandard

65100

65100

65 85

50 50

18 x In18 x In

200, 250, 300, 400, 600, 800,1000, 1200, 1600, 2000,2500, 3000SBS-E30 Double 200 150 50 50

4000 SBS-840SBS-C40SBS-E40

DoubleDoubleDouble

85100200

85100150

85100

85100 50

18 x In18 x In50

2000, 2500, 3000, 4000

5000 SBS-850SBS-C50

SBS-E50

DoubleDouble

Double

85100

200

85100

150

85100

85100

50

18 x In18 x In

50

2500, 3000, 4000, 5000

6000 SBS-C60 Double 100 100 100 100 18 x In 3000, 4000, 5000, 6000

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Breaker-Mounted Options

Magnum DS and SB Breaker-Mounted Options016

Breaker-Mounted Options

Magnum breakers are available witha comprehensive array of factory-installed breaker options to enableconfigured-to-order solutions for

specified customer requirements.Field option kits are available toprovide easy service, modificationand customization of the breaker atthe point of use.

Shunt trip device(ST). Providesfor remote electrically controlledbreaker opening when energizedby a rated voltage input

Spring charge motor (MOT).Charges the breaker closing springsautomatically, facilitating remote orlocal closing. The motor assemblyincludes its own cut-off switchthat changes state at the end of thecharging cycle. This contact can bewired out for external indication

Spring release device(SR).Provides for remote electricallycontrolled breaker closing whenits coils are energized by a ratedvoltage input

Undervoltage release(UVR).Trips the breaker when an existingvoltage signal is lost or fallsbelow an established threshold

Auxiliary switch. Up to 6a/6bauxiliary individual dedicatedcontacts are available for customeruse to indicate if the breaker is inthe OPEN or CLOSE position

Mechanical trip indicator flag .The red trip indicator flag pops outto provide local visual indicationwhen the Digitrip RMS trip unitacts to trip the breaker on anovercurrent condition. Availablein two options: an interlockedversion that mechanicallylocks out the breaker until theindicator is manually reset anda non-interlocked version forindication only

Bell alarm/overcurrent trip switch (OTS). Provides two Form C con-tacts that change state when theDigitrip RMS trip unit acts to trip thebreaker. The contacts are availablefor external indication or customer

use and are manually reset by themechanical trip indicator

Padlockable pushbutton cover.Permits padlocking hinged coverplates to block access to the PUSHON and PUSH OFF buttons on thebreaker faceplate

Mechanical operations counter.Records mechanical operations ofthe breaker over its installed life

Key off lock provisions. Enablesmounting of a single cylinder Kirk,Castell or Ronis Key Lock to lock thebreaker in the OPEN position

Latch check switch. Provides oneForm C contact that changes state

when the breaker is ready to close.Can be wired to the spring releasedevice for fast transfer applicationsor wired for external ready-to-closeindication

Shunt Trip, Spring Release andUndervoltage Release DeviceInstalled on Accessory Deck

Auxiliary Switches Come in Modular 2a/2bContact Stages Providing up to 6a/6bDedicated Contacts

Mechanical Trip Indicator withBell Alarm (OTS) Switches Mounted

For the Digitrip RMS 1150+ trip unit, otherprotective functions, if programmed, willcause the OTS and mechanical trip indicatorflag to operate.

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Microprocessor Trip Units

General DescriptionMagnum DS and SB Trip Units017

Digitrip RMS Trip Unit Familyfor Magnum Circuit Breakers

The Magnum family of Digitrip RMStrip units consists of four trip unitmodels, each providing increasing

levels of features and options toenable the ultimate selection tomatch application requirements forprotection, coordination, information,diagnostics and communication:

Digitrip RMS 520

Digitrip RMS 520M

Digitrip RMS 520MC

Digitrip RMS 1150+

Common Trip Unit FeaturesA summary of the important featurescommon to all Magnum trip units isas follows:

Microprocessor-based truerms sensing

Discrete rotary or programmablesettings

Unit status LED (green)

Cause of trip LEDs (red)

Battery check LED (green)

Reset/battery test pushbutton

Making current release

Thermal memory

Over-temperature protective trip

Zone selective interlocking (ZSI)provisions

Rating plug receptacle

Backup battery for cause oftrip LEDs

Test kit receptacle with cover

Plug-in mounting for easyreplacement

Clear plastic cover (sealable)

Digitrip RMS trip units are highlyaccurate microprocessor-basedprotective devices that use a samplingalgorithm to compute true rms valuesfor precise system coordination andmetering. The trip unit is completelyself-contained and requires noexternal control power to perform

its overcurrent protective functionsbecause the power to operate thetrip unit is derived from the primarycurrent passing through the currentsensors. When the trip unit is operat-ing, the green unit status LED beginsto blink like a heartbeat to visiblyconfirm the microprocessor ispowered up.

The trip unit overcurrent protectivepickup settings are a function of thebreaker In rating, which is establishedby the rating plug and current sensors.When preset conditions are exceeded,the trip unit initiates a trip signal to

the trip actuator, tripping the circuitbreaker. Red cause-of-trip LEDs lightup to indicate the cause of trip,powered by a easily replaceablebackup battery located behind therating plug. The LED will flash tosave power, until the trip unit resetbutton is depressed.

All trip units include three importantself-protecting safety features that areprovided as standard:

Making Current Release (MCR):employs a fast-acting analog instanta-neous trip that prevents the breakerfrom closing and latching on a fault

when the peak current exceeds 25 xthe breaker Inrating. This reduces arcflash energy during breaker closing forfaults within the self-protecting range.The MCR is enabled for the first twocycles following the circuit breakerclosing operation and thereafter,depending on the type of Magnumbreaker applied, becomes inactive.

Over-Temperature Protective Trip:automatically trips the breaker whenthe temperature inside the trip unitexceeds 85C, which indicates thatthere are significantly highertemperatures within enclosure.

Thermal Memory: provides over-temperature protection on load circuitsagainst effects of repeated overloadconditions. This feature is defeatablefor special applications such aswelding and primary injection testing.

Trip Units

Eatons electrical sector introduced thefirst microprocessor-based trip unitand has advanced the technologyinto a new family of UL and CSAlisted Digitrip RMS electronic andprogrammable trip units designedand engineered exclusively for

Magnum DS breakers.

Electronic Trip Units

Digitrip RMS 520 enables theuser as many as nine phase andground current protection settingsfor maximum flexibility in trip-curve shaping and multi-unitcoordination, and adds groundcurrent protection settings

Digitrip RMS 520M adds phase,neutral and ground currentmetering with a four-characterLCD display window

Digitrip RMS 520MC addscommunication of current values

and breaker status (open, closed,tripped), and Arcflash ReductionMaintenance System for arc flashreduction

Programmable Trip Units

Digitrip RMS 1150+ providesprogrammability for moresophisticated distribution systems

Increased protection andcoordination capabilities

Systems monitoring informationincluding power factor, voltage,current, harmonic distortion

values and waveform capturewith a bright three-line, (eightcharacters per line) LED display

Two programmable contacts forcustomer use

Time and date stamping of tripevents for improved trouble-shooting and diagnostics

Accuracy of 1% on current andvoltage values and 2% on energyand power

Systems diagnostic informationand breaker health menu

Communications

Arcflash Reduction MaintenanceSystem for arc flash reduction

Magnum 520MC Trip Unit withArcflash Reduction MaintenanceSystem, Four-Digit LCD Display andAmpere-Based Communications

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Magnum 1150+ Trip Unit with Arcflash

Reduction Maintenance System, 24-DigitLED Display, Programmable Protection,Alarms and Relaying, Power Metering,Power Quality and Alarms, WaveformCapture, Communications and BreakerHealth Monitoring

Arcflash ReductionMaintenance System

The Arcflash Reduction MaintenanceSystem Maintenance Mode functionof the Digitrip 520MC and 1150+ canreduce arc flash incident energy thatis generated on a fault condition. Thisis accomplished by an analog tripcircuit that, when armed, provides afast-acting response to the fault. Thisis separate from the normal systemprotection setting of instantaneous.

Eatons Arcflash ReductionMaintenance System employs aseparate, dedicated analog tripcircuit that eliminates microprocessorlatencies, resulting in clearing timesthat are faster than standard instanta-neous tripping. This provides superiorarc flash reduction to competitorssystems that simply lower the standardinstantaneous pickup set point.

There are three ways to arm theMaintenance Mode ArcflashReduction Maintenance Systemsetting. One method is locally at thetrip unit front panel. For the 520MC, thetwo-position switch in the MaintenanceMode section of the trip unit is used.Turning the switch to the ON positionwill arm the setting. For the 1150+, thelocal front keypad is used to enable theMaintenance Mode setting. The settingis located in the SYSTEM submenu ofprogrammable settings (PGM SET).

For the second method of arming theMaintenance Mode function, a remoteswitch wired through the breakersecondary contacts can remotelyarm the Maintenace Mode setting. Ahigh-quality gold-plated or palladium

contact is required in this application.A third method to arm theMaintenance Mode setting is viaa communication device. There isa confirmation screen that verifiesthe arming. A BIM (Breaker InterfaceModule) or Power Xpertsystemare communication methods to armthe setting.

The Arcflash Reduction MaintenanceSystem setting has five unique settings(2.5, 4.0, 6.0, 8.0, 10.0 x In). To adjust thissetting, a rotary switch on the trip unitface is provided for the 520MC while the1150+ trip unit uses its local keypad.

For all three arming methods, the520MC provides a blue LED to confirmthe Maintenance Mode function is on.In addition, there is also a normallyopen breaker contact that allows theuser to wire in an external stacklight or

annunciator for remote indication. Forthe 1150+, the message MaintenanceMode Enabled will be shown on itsLED display. The 1150+ also has analarm relay that can be programmedto track the Maintenance Mode state.

The maintenance mode function willprovide fast tripping even when theregular Instantaneous is set to OFF.The instantaneous LED position isalso used to indicate a trip initiatedby the Maintenance Mode setting.The 520MC LCD display, if powered,will indicate with four dashes whilethe 1150+ will display the messageMaintenance Mode Trip.

Figure 26.1-5. Arcflash Reduction Maintenance SystemTypical Time Current Curve withMaintenance Mode

Time

Current102.5 to 10

Times In

40 msec

MaintenanceMode

Total Clearing Time

40 msec

OptionalInstantaneous

InstantaneousTotal Clearing Time

60 to 75 msec

LDT @ 6X IrTypical 2 to 20 Sec

SDPV = 2 to 10 Times Ir

SDTTypical 0.1, 0.2,0.3, 0.4, 0.5 Sec

LDPUTypical Inx 0.4 to 1.0

Typical at 480V, 60 Hz

In= Rating Plug/Sensor RatingI

60 to 75 msec Maintenance Mode

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Figure 26.1-6. Maintenance Mode Wiring Digitrip 520MC

ControlVoltage 4

5

L

RemoteIndicator(BlueLight)

Communication wiring to BIM,MODBUS MINT or Power Xpertcomputer. This can activateMaintenance Mode if desired.

Remote Arcflash Reduction

Maintenance System SwitchArcflash ReductionMaintenanceSystem Switch

Alternate CustomerWiring (Partial)

Magnum Breaker (with MM wiring)

7

7

3

61

3

1

2

B7A12B7A12A15 A14 A9A10 B1 B2

The Digitrip 520MC (Cat 5ARMxxx) can locally be placed in Maintenance Mode via a two-position switch located on the trip unit. The function canalso be armed via a remote switch as shown. In addition, the function can be activated via communications. A blue LED on the Digitrip verifiesthe Digitrip is in Maintenance Mode.

The recommended selector switch for this low voltage application is Eaton part number 10250T1333-2E, which includes a contact block rated forlogic level and corrosive use.

The maximum length of this wiring to remote Arcflash Reduction Maintenance System switch (or alternate relay contact) is 9.78 ft (3m). Use#20 AWG wire or larger.

Control voltage is 120 Vac or 230 Vac or 2448 Vdc or 125 Vdc. Check Magnum circuit breaker front cover for trip unit power requirements. A remote stack light, annunciator panel or other remote indication device can be connected to verify that the Digitrip is in Maintenance Mode. Relay in (GF alarm/PS module) makes when in Maintenance Mode. Contact is rated 1A at 120 Vac or 0.5A at 230 Vac or 1A at 2448 Vdc and

0.35A at 125 Vdc. The Digitrip 520MC can also be placed remotely in its Maintenance Mode via a general purpose relayice cube type with logic level contacts

activated by remote control switch. A recommended type is IDEC Relay RY22. Choose voltage as desired.

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Digitrip 520 Trip Unit

Digitrip 520 Trip Unit withBasic Overcurrent Protection

The Digitrip 520 is a simple basictrip unit with three available typesof protection (LI, LSI and LSIG).

Up to nine rotary-type current andtime settings provide for maximumflexibility in curve-shaping andmulti-unit coordination.

The Instantaneous function (I)includes an off position settingwhen Short Time (S) protection isprovided to increase applicationflexibility in the field

I2t time delay settings for bettercurve shaping when Short Time (S)and Ground Fault (G) protectivefunctions are selected

Zone Selective Interlocking (ZSI)provided when Short Time (S)

and/or Ground Fault (G) protectivefunctions are selected. ZSI provideshard-wired positive system coordi-nation, allowing the breaker closestto the fault to trip first, thus avoidingunnecessary and costly systemdowntime. ZSI is a useful methodto reduce arc flash

Digitrip 520M Trip Unit

Digitrip 520M Trip Unit with Four-DigitLCD Display and Ampere-based Metering,Alarms and System Diagnostics

The Digitrip 520M is available withthree types of protection (LSI, LSIG

and LSIA) and includes the followingadded features:

Four-digit LCD display with a steppushbutton to scroll through thedisplay data, including ampere-based metering of phase, neutraland ground currents, plusoperational and cause-of-tripdiagnostic information

When specified, the Power RelayModule (PRM) is supplied toperform the following features:

Power up the trip unit displayfrom an external customersupplied source through the

breaker secondary contacts toretain the cause-of-trip andmagnitude of trip information

Provide relay contact for remoteindication of overload (LSI) orground trip (LSIG) or groundalarm (LSIA)

Type LSIA units alarm only whenground fault settings are exceeded,which is quite useful in criticalpower applications

Plug receptacle for auxiliary powermodule to power up the trip unitdisplay during bench testing remotefrom the switchgear

Digitrip 520MC Trip Unit

Digitrip 520MC Trip Unit WithArcflash Reduction MaintenanceSystem, Four-Digit LCD Displayand Ampere-based Communications

The Digitrip 520MC is available in

three types of protection (LSI, LSIGand LSIA) and includes the followingenhancements:

Communications of ampere-baseddata, breaker status and cause-of-trip information using the INCOMcommunications system. Each tripunit has a unique hexadecimaladdress (001 to 999) set by rotaryswitches. A red transmit LED isprovided to confirm communica-tions activity. Peripheral translatordevices are available to convertINCOM to other protocols likeModbus, Ethernet and so on

Arcflash Reduction MaintenanceSystem allows the operator to enablea special trip unit maintenancemode with a preset acceleratedinstantaneous override trip that canreduce arc flash energy up to 30%.This accelerated tripping resultsin total clearing times that arefaster than standard instantaneoustripping. The arc flash reduction levelis preset at the trip unit using a five-position switch that facilitates themaximum arc flash reduction settingpossible while avoiding nuisancetripping. The Arcflash ReductionMaintenance System can be turnedon locally at the trip unit, remotelyusing peripheral devices, or viacommunications. A blue LEDprovides local indication the trip unitis in the Maintenance Mode. Remoteindication can be accomplished bya dedicated trip unit contact for usewith a stack light or annunciatorpanel, or via communications

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General DescriptionMagnum DS and SB Digitrip Trip Units021

Digitrip 1150+ Trip Unit

Digitrip 1150+ Trip Unit

The Digitrip 1150+ trip unit is a highlyadvanced programmable protectivedevice available in three types ofprotection (LSI, LSIG and LSIA).

The following is a first level summaryof the special features and options:

24-character LED digital displayeasily visible from 50 feet and idealfor dark equipment environments

Membrane type dust-resistantkeypad pushbuttons to facilitatelocal unit programming, includingview functions (Up, Down, ESCape,SELect and Reset), edit values(Up, Down and Save) andbattery test

Programmable trip unit settingsand curves including I2t and I4tcurves, as well as IEEE moderatelyinverse, very inverse and extremelyinverse curves

Voltage and power metering

Power quality monitoring and alarmwith THD and waveform capture

Health menuThe health menuon the Digitrip 1150+ front panel willprovide information on the Magnumcircuit breakers health, as well asa history of the circuit breaker andcircuit it is protecting. This data is

useful for planning maintenanceand inspection schedules. The typeof data includes the total number ofall instantaneous and short delaytrips seen by the circuit breaker. Asecond counter shows the numberof overloads (LDT) and groundfaults (GFT) encountered while inservice. The OP count provides dataon the number of close operationsexperienced by the circuit breaker.The last time the circuit breaker wasoperated (open or closed or tripped)is viewable with time and datedisplayed. Also included is themaximum temperature in degreesCentigrade as seen by the Digitripmicroprocessor CHip. The captureof the data requires externaltrip unit power. This data, oncecaptured, is stored in non-volatilememory. These features are avail-able for remote communications

Programmable alarm contacts ortrip contacts

Programmable relay functionsincluding undervoltage, overvoltage,underfrequency, overfrequency,reverse power, voltage unbalanceand phase rotation

Communications of comprehensiveaccess to trip unit capabilitiesincluding programmable settings,breaker control, metering, alarm,status, relaying and diagnosticinformation. Peripheral translator

devices are available to convertINCOM to other protocols likeModbus, Ethernet and so on

Accessory bus for use withperipheral digital relay modulesthat can be programmed throughthe trip unit keypad for additionalauxiliary and various alarm contacts

Arcflash Reduction MaintenanceSystem allows the operator to enablea special trip unit MaintenanceMode with a preset acceleratedinstantaneous override trip that canreduce arc flash energy up to 30%.This accelerated tripping results intotal clearing times that are faster

than standard instantaneoustripping. The arc flash reductionlevel is preset at the trip unit for themaximum arc flash reduction settingpossible, while avoiding nuisancetripping. The Arcflash ReductionMaintenance System can be turnedon locally at the trip unit, remotelyusing peripheral devices, or viacommunications. The displayprovides local indication the trip unitis in the Maintenance Mode. Remoteindication can be accomplished bya dedicated trip unit contact for usewith a stack light or annunciatorpanel, or via communications

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Selection GuideMagnum DS and SB Digitrip Trip Units022

Table 26.1-6. Digitrip Trip Units for Magnum DS and SB ANSI/UL Rated Power Circuit Breakers

Over and undervoltage alarm or trip, overand underfrequency alarm or trip, voltageunbalance alarm or trip, reverse power trip,and phase rotation alarm are included.

1200A maximum ground fault setting perUL/NEC.

Test set for secondary injection.

Legend: In = Rating Plug and Sensor Rating.Ir = Long Delay Pickup setting.

Trip Unit Type Digitrip 520 Digitrip 520M Digitrip 520MC Digitrip 1150+

Ampere rangeInterrupting rating at 480Vrms sensing

2006000A42200 kAYes

2006000A42200 kAYes

2006000A42200 kAYes

2006000A42200 kAYes

Protection and Coordination

Protection Ordering optionsFixed rating plug (In)Overtemperature trip

LI, LSI, LSIGYesYes

LSI, LSIG, LSIAYesYes



Longdelayprotection(L)

Long delay pickupLong delay time I2t at 6 x IrLong delay time I4tIEEE curves

0.41.0 x (In)224 secondsNoNo



0.41.0 x (In)224 seconds15 secondsYes

Long delay thermal memoryHigh load alarm

YesNo

YesNo

YesNo

Yes0.51.0 x (Ir)

Shortdelayprotection(S)

Short delay pickupShort delay time I2t at 8 x IrShort delay time flatShort delay time ZSI

2001000% x (Ir) and M1100500 ms100500 msYes

2001000% x (Ir) and M1100500 ms100500 msYes

2001000% x (Ir) and M1100500 ms100500 msYes

2001000% x (Ir) and M1100500 ms100500 msYes

Instanta-neousprotection(I)

Instantaneous pickupMaking current releaseOff position

2001000% x (In) and M1YesLSI and LSIG

2001000% x (In) and M1YesYes



Groundfaultprotection(G)

Ground fault alarmGround fault pickupGround fault delay I2t at 0.625 x In

No25100% x (In)100500 ms

Yes25100% x (In)100500 ms

Yes25100% x (In)100500 ms

Yes24100% x (In)100500 ms

Ground fault delay flatGround fault ZSIGround fault thermal memory

100500 msYesYes

100500 msYesYes

100500 msYesYes

100500 msYesYes

Disable ground fault protection No No No No

Neutral protection (N) Model LSI Model LSI Model LSI Model LSI

System Diagnostics

Cause-of-trip LEDsMagnitude of trip information

YesNo

YesYes

YesYes

YesYes

Remote signal contactsProgrammable contacts

NoNo

YesNo

YesNo

YesYes

System Monitoring

Digital displayCurrent (% ) full scale sensor

NoNo

4-character LCDYes 2%

4-character LCDYes 2%

24-character LEDYes 1%

Voltage (%) L to LPower and energy (%)Apparent power kVA and demand

NoNoNo

NoNoNo

NoNoNo

Yes 1%Yes 2%Yes

Reactive power kVARPower factorCrest factor

NoNoNo

NoNoNo

NoNoNo

YesYesYes

Power qualityharmonics% THD, waveform capture

NoNo

NoNo

NoNo

YesYes

System Communications

TypePower supply in breaker

NoN/A

NoOptional

INCOMStandard

INCOM/TripLinkStandard

Additional Features

Trip log (three events)Electronic operations counter

NoNo

NoNo

NoNo

YesYes

Testing method

Waveform captureTest setNo

Test setNo

Test setNo

Integral and test setYes

Arcflash Reduction Maintenance SystemBreaker health monitorProtective relay functions

NoNoNo

NoNoNo

YesNoNo

YesYesYes

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Technical and Application Data023

Time-Current Curve Shaping

Figure 26.1-7. Time-Current Curve ShapingNote: See selection guide charts foravailability of adjustments.

Long Delay (L)

1. Long Delay PickupDetermines the continuousampere rating of the breaker.

2. Long Delay TimeDetermines the amount of timethe breaker will carry a low leveloverload before tripping.

a. I2t ResponseI2t in: For coordination with othercircuit breakers with electronictrip devices and for coordination

with thermal-magneticcircuit breakers.

b. I4t ResponseI4t in: For coordination withfuses and upstream trans-former damage curves.

Short Delay (S)

3. Short Delay PickupDetermine or set the level of faultcurrent at which the short-timetrip delay countdown is actuated.

4. Short DelaySets the amount of time the breakerwill carry both a low level and highfault currents before tripping.

a. Flat ResponseI2t out: For coordination withother circuit breakers withelectronic trip devices.

b. I2t ResponseI2t in: For coordination with fusesand thermal-magnetic breakers.

7B

7A

6

Time

5

1

4B

4A

2A

2B

2

3

Current in Multiples

4

7

Instantaneous (I)

5. Instantaneous PickupDetermines the level of faultcurrent that will actuate a trip withno time delay.

Ground Fault (G)

6. Ground Fault PickupDetermines the level of faultcurrent at which the ground faulttrip delay countdown is actuated.

7. Ground Fault DelayDetermines the amount of timethe breaker will carry a groundfault before tripping.

a. Flat ResponseI2t out: For coordination withother circuit breakers withelectronic ground fault settings.

b. I2t ResponseI2t in: For coordination withzero sequence ground fault

relays, fuses and thermal-magnetic breakers.

Feeder BreakersGeneral

Circuit breakers for feeder circuitprotection may be manually orelectrically operated, with longand short delay or long delay andinstantaneous type trip devices,and trip settings, as required for thespecific circuit and load requirements.

General purpose feeder breakers, such asfor lighting circuits, are usually equippedwith long delay and short delay tripdevices, with the long delay pickup set

for the maximum load demand in thecircuit. Where arcing fault protectionis required, add instantaneous tripwith setting as low as practicableconsistent with inrush requirements.As an option, the Arcflash ReductionMaintenance System can be selectedfor increased arc flash protectionduring maintenance.

Motor Starting Feeder Breakers

These breakers are usually electricallyoperated, with long delay, shortdelay and instantaneous trippingcharacteristics for motor running,locked rotor and fault protection.The breaker sensor rating should bechosen so that the long delay pickupcan be set at 125% of motor full loadcurrent for motors with a 1.15 servicefactor, or at 115% for all other motors.Contactors are recommended for thisapplication when circuit breaker dutycycle is exceeded.

Repetitive DutyRepetitive breaker opening andclosing, such as in frequent motorstarting and stopping, are coveredby ANSI standards C37.13 and C37.16.These standards list the number

of operations between servicing(adjusting, cleaning, lubrication,tightening and so on) and the totalnumbers of operations undervarious conditions without requiringreplacement of parts, for the variousbreaker frame sizes.

For motor starting duty, with closingstarting currents up to 600% and openingrunning currents up to 100% of thebreaker frame size, at 80% powerfactor or higher, the endurance ortotal operations (not requiring partsreplacement) will be as follows:

800A Frame: 1400 operations

1600A Frame: 400 operations

The frequency of operation should notexceed 20 starts in 10 minutes or 30 inone hour.

Group Motor Feeder Breakers

Typical loads for such circuits are motorcontrol centers. The feeder breakersmay be either manually or electricallyoperated as preferred, and are usuallyequipped with long and short delay tripprotection only for coordination withthe individual motor circuit devices.The minimum long delay pickup settingshould be 115% of the running current

of the largest motor in the group, plusthe sum of the running circuits of allother motors.

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Technical and Application Data024

Zone Selective InterlockingZone selective interlocking providespositive system coordination by allowingthe breaker closest to the fault to tripwithout any preset time delays. This isachieved by setting up the distribution

system as shown in Figure 26.1-8.The hardwired connection betweenthe trip units sends a restrainingsignalupstream, allowing the breaker closestto the fault to act instantaneously.Zoneselective interlocking also reducesstress on the distribution system byisolating faults without time delays.

By definition, a selectively coordinatedsystem is one where by adjusting tripunit pickup and time delay settings, thecircuit breaker closest to the fault tripsfirst. The upstream breaker serves twofunctions: (1) backup protection to thedownstream breaker and (2) protectionof the conductors between the upstreamand downstream breakers. Theseelements are provided for on Digitriptrip units.

For faults that occur on the conductorsbetween the upstream and down-stream breakers, it is ideally desirablefor the upstream breaker to tripwith no time delay. This is thefeature provided by zone selectiveinterlocking. Digitrip trip units includethis option.

Zone selective interlocking is acommunication signal betweentrip units applied on upstream anddownstream breakers. Each trip unitmust be applied as if zone selectiveinterlocking were not employed, andset for selective coordination.

During fault conditions, each trip unitthat senses the fault sends a restrainingsignal to all upstream trip units. Thisrestraining signal results in causing theupstream trip to continue timing as itis set. In the absence of a restrainingsignal, the trip unit trips the associatedbreaker with no intentional time delay,minimizing damage to the fault point.This restraining signal is a very lowlevel. To minimize the potential forinduced noise, and provide a low

impedance interface between tripunits, twisted pair conductors areused for interconnection.

Ground fault and short delay pickupon Digitrip trip units have zoneselective interlocking.

Zone selective interlocking may beapplied as a type of bus differentialprotection. It must be recognized;

however, that one must accept theminimum pickup of the trip unitfor sensitivity.

It must also be recognized that notall systems may be equipped withzone selective interlocking. Systemscontaining multiple sources, or wherethe direction of power flow varies,require special considerations, or may

not be suitable for this feature. Digitripzone interlocking has been tested withup to three levels with up to 20 tripunits per level.

Figure 26.1-8. Zone Selective Interlocking

Zone 1

Zone 2

Zone 3

Fault 1

Fault 2

Fault 3

Load

BreakerNumber 1

BreakerNumber 2

BreakerNumber 3

Ground Fault Setting:300A PickupNo Time Delay

Zone SelectiveInterlocking Wiring

Ground Fault Setting:600A Pickup0.3 Seconds Time Delay

Ground Fault Setting:1200A Pickup0.5 Seconds Time Delay

Fault 1

There are no interlocking signals. The main breaker trip unit will initiate thetrip instantaneously.

Fault 2

The feeder breaker trip unit will initiate the trip instantaneously to clear thefault; and Zone 2 will send an interlocking signal to the Zone 1 trip unit. TheZone 1 trip unit will begin to time out, and in the event that the feeder breakerin Zone 2 would not clear the fault, the main breaker in Zone 1 will clear thefault in 0.5 seconds.

Fault 3

The branch breaker trip unit will initiate the trip instantaneously to clear thefault; and Zone 3 will send an interlocking signal to the Zone 2 trip unit; andZone 2 will send an interlocking signal to Zone 1.

Zone 1 and Zone 2 trip units will begin to time out, and in the event that thebranch breaker in Zone 3 would not clear the fault, the feeder breaker inZone 2 will clear the fault in 0.3 seconds. Similarly, in the event that the feederbreaker in Zone 2 would not clear the fault, the main breaker in Zone 1 will clearthe fault in 0.5 seconds.

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Magnum DS and SB

Technical Data025

Table 26.1-7. Magnum DS and SB Breaker Control Device Application GuideVdc

Table 26.1-8. Magnum DS and SB Breaker Control Device Application GuideVac

Breaker Control DeviceNominal Voltage

24 Vdc 32 Vdc 48 Vdc 125 Vdc 250 Vdc

Shunt Trip (ST)Operational voltage rangePower consumption (inrush)

Opening time

Trip circuit70110%(required for 35 ms)

Seconds

1726 Vdc250 watts

35 ms

3453 Vdc250 watts

35 ms

77138 Vdc450 watts

35 ms

154275 Vdc450 watts

35 msSpring Release (SR)Operational voltage rangePower consumption (inrush)Closing time

Close circuit70110%(required for 200 ms)Seconds

1726 Vdc250 watts40 ms




Spring Charge Motor (MOT)Operational voltage rangeAmps (running)Amps (inrush)Power consumptionCharging time

85110% voltageRunning% of running

Seconds

2026 Vdc12.0A300%300 watts5 sec

4153 Vdc5.0A500%250 watts5 sec

94138 Vdc2.0A600%250 watts5 sec

187225 Vdc1.0A600%250 watts5 sec

Undervoltage Release (UVR)Operational voltage rangeDrop-out voltage rangePower consumption (inrush)Power consumption (continuous)Opening time

85110% voltage3060% voltageRequired for 200 msRequired for 400 msSeconds

2026 Vdc714 Vdc250 watts18 watts70 ms





Auxiliary Switches

Minimum loadContact rating Inductive load 0.5A

0.5A 0.5A 0.25A

Breaker Control DeviceNominal Voltage

120 Vac 240 Vac 415 Vac 480 Vac 600 Vac

Shunt Trip (ST)Operational voltage rangePower consumption (inrush)Opening time

Trip circuit70110%(Required for 35 ms)Seconds

77140 Vac450 VA35 ms

146264 Vac450 VA35 ms

Spring Release (SR)Operational voltage rangePower consumption (inrush)Closing time

Close circuit70110%(Required for 200 ms)Seconds

77140 Vac450 VA40 ms

146264 Vac450 VA40 ms

Spring Charge Motor (MOT)Operational voltage rangeAmps (running)Amps (inrush)Power consumptionCharging time

85110% voltageRunning% of running

Seconds

93140 Vac2.0A600%250 VA5 sec

177264 Vac1.0A600%250 VA5 sec

Undervoltage Release (UVR)Operational voltage rangeDrop-out voltage rangePower consumption (inrush)Power consumption (continuous)Opening time

85110% voltage3060% voltageRequired for 200 msRequired for 400 msSeconds

94140 Vac3376 Vac450 VA10 VA70 ms

177264 Vac62144 Vac400 VA10 VA70 ms

323457 Vac114249 Vac480 VA10 VA70 ms

408528 Vac144288 Vac400 VA10 VA70 ms

510660 Vac180360 Vac400 VA10 VA70 ms

Auxiliary SwitchesMinimum loadContact rating Inductive load 10A 10A

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Magnum DS and SB

Technical Data026

Figure 26.1-9. Typical Magnum Breaker Control Circuit Diagram

Figure 26.1-10. Typical Magnum Secondary Terminal Block Connection Diagram

ControlPower

Close

B12

Leverin DoorSwitch(Draw-out Only)

L.S. b.

a.

a.

OTS 1*

OTS 2*

B15 B26

MDSEOBKR

B10 B24 A7

B13 B14 B27 B11 B25 A8

A1 A2 A3

A4 A5 A6

Open OpenG R

SR

MOT

UVRST

Legend:

LS Limit Switch for Closing Spring

MOT Motor for Spring Charging

ST Shunt Trip

SR Spring Release

UVR Undervoltage ReleaseOTS Overcurrent Trip Switch

Description of Operation:

1 Motor is energized throughLS contact.

2 Motor runs and charges closingspring.

3 When closing spring is fully charged,LS contacts change state.

4 Close contacts energize SR coil.

5 When breaker closes, b opens.

6 LS contacts change state and motorrecharges closing springs.

* Contacts shown for breaker open (not fullycharged), not tripped.

Dotted line denotes Magnum Breaker. Continuous Duty Shunt Trip also available

that eliminates the requirement for thea contact cutout switch.

A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A1 1 A1 2 A 13 A14 A15

ONO OC UVRONOONO OC ONO UVR ALL ALC AL ICL

UVR ATROTS OTS ATR

ATR ATR

INCOM

CLOSEINPUT

A16 A17 A 18 A 19 A2 0 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30

MLS ACN NO NCACP NO NC NO NO NC NC NO NO NC NC

SPRINGCHARGESTATUS

ACCESSARYBUSCOMMUN-ICATIONS

BREAKER AUXILIARY CONTACTS(SHOWN WITH BREAKER IN OPEN POSITION)

B16 B17 B18 B19 B20 B21 B22 B23 B24 B 25 B 26 B2 7 B28 B29 B30

NO NCNO NO NO NONC NCNC NO NC NC LCO LC LNC

BREAKER AUXILIARY CONTACTS(SHOWN WITH BREAKER IN OPEN POSITION)

LATCHCHECKSWITCH

CELL SWITCH CONTACTS(SHOWN WITH BREAKER IN WITHDRAWN POSITION)

C7 C8 C9 C10 C11 C12

CNC CC CNOCNC CC CNO

CELL SWITCH CONTACTS(SHOWN WITH BREAKER IN WITHDRAWN POSITION)

CNC CC CNO CNC CC CNO

C1 C2 C3 C4 C5 C6

INCOM NEG

POWERINPUT

NEUTRAL

SENSORINPUT

SOURCE

GROUNDINPUT

ZONE

INTER-LOCKING

SHUNT

TRIP

SPRING

RELEASE

MOTOR

COM IN OUT

B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15

IP IN NPW N2 N1 SGF ZC ZI ZO ST ST SR SR M M

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