Switch disconnector fuse unit, Type 3KL and Switch disconnector unit, Type 3KA Application Siemens pioneered the AC23A concept, now widely demanded by customers/consultants alike. 3KL/ 3KA unit are suitable for diverse applications of switching ranging from no-load conditions to stringent conditions e.g. switching highly inductive loads. They can be used for mixed resistive, inductive loads, capacitor banks and both in AC & DC circuits. Special execution for corrosive atmosphere are also available. Standards The Switch disconnector fuse and Switch disconnector conform to IEC 947-3 and IS 13947-3. Note: Switch disconnector fuse units (SDF) were earlier called fuse switch units. I We also offer SDFs for use in corrosive atmosphere Range 3KL : Switch Disconnector Fuse Unit Open 32A, 50A, 63A, 100A, 125A, 200A, 250A, 315A, 400A, 630A, 800A In SS 32A, 63A, 125A, Enclosure 250A, 400A, 630A 3KA : Switch Disconnector Unit Open 63A, 125A, 250A, 400A, 630A, 1000A, 1600A India's most trusted and popular SDF / SD units.
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Switch disconnector fuse unit, Type 3KL andSwitch disconnector unit, Type 3KA
Application
Siemens pioneered the AC23Aconcept, now widely demanded bycustomers/consultants alike. 3KL/3KA unit are suitable for diverseapplications of switching rangingfrom no-load conditions tostringent conditions e.g. switchinghighly inductive loads. They can beused for mixed resistive, inductiveloads, capacitor banks and both inAC & DC circuits. Special executionfor corrosive atmosphere are alsoavailable.
Standards
The Switch disconnector fuse andSwitch disconnector conform toIEC 947-3 and IS 13947-3.
Note:Switch disconnector fuse units(SDF) were earlier called fuseswitch units.
�
We also offer SDFs for use
in corrosive atmosphere
Range
3KL : Switch Disconnector Fuse Unit
Open 32A, 50A, 63A, 100A,125A, 200A, 250A,315A, 400A, 630A, 800A
In SS 32A, 63A, 125A,Enclosure 250A, 400A, 630A
3KA : Switch Disconnector Unit
Open 63A, 125A, 250A, 400A,630A, 1000A, 1600A
India's most trusted and popular SDF / SD units.
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Benefits
a) Wide range
Single source for,SDFs, open upto 800 ASDFs, in SS enclosure upto630 ASDs, open upto 1600 A
b) No movement of fuses
Prevents loosening of fuses;hence reliable short circuitprotection.
c) Suitable for knife blade fuses
Reduced down time for fuseinspection/replacement.
d) Double break feature*
Isolates the fuses at both theends. Thus total protection tooperating personnel.
e) Wide service temperaturerange -20°C to 55°C
Siemens SDFs require noderating even upto service tempof +55°C. e.g. in a distributionfeeder with a load current of375A, you may use 3KL unitrated 400A.
If one uses an unit of othermake (which needs to bederated at 55°C, say by 15%),it can be used only upto340A. Thus a 630A unit of thatmake may be necessary forsame application. This meansapprox. 40% increase in costfor this particular example.
f) Maintenance free
Very high mechanical lifecoupled with an equally high
electrical life eliminates anyneed for contact replacement.
g) Positive isolation
All 3KL/3KA satisfy the isolationrequirements of IEC 947 /IS 13947 standards. Thisprovides greater safety tooperating personnel.
h) Positive indication of contactseparation
Siemens SDFs come with builtin POSITIVE OFF indicator. Forthe purpose of identifying theON/OFF state of the unitreliably, for obvious reasons, thehandle on the door is normallynot preferred by maintenancepersonnel / consultants.
In makes without aPOSITIVE OFF indicator, anauxiliary switch plus lampwould be required,amounting to approx. Rs. 300for 125A SDF. Thus in a typical125A unit of non-Siemensmake one has to reckon withan extra cost of approx. 10%.
Of course, the combination ofauxiliary switch plus pilot lampis still not as positive as an unitwith built in POSITIVE OFFindicator.
i) Adjustable drive shaft, to suitpanel depth
Siemens SDFs come with atelescopic shaft which allowsthe panel builder to readily useit for varying panel depth.
In the case of other makes,the non-availability of atelescopic shaft makes the
1. Switch disconnector fuse unit.2. Fuse-monitor
unit inflexible. Hence thepanel builder has to fabricatean additional bracket toadapt unit to his panel depth.Thereby increasing labourtime & cost e.g. approx.Rs. 50 for 125A unit.
j) Front Drive
Front drive incorporates doorinterlock with defeat facility, andpadlocking as a standard.
k) Neutral Link
Every SDF/SD is provided witha neutral link. Its terminals aresuitable for accommodatingneutral conductors of half thecross-section as those of themaximum permissible maincables.
l) Phase barriers as standard
Provides greater safety.
m) Fuse monitoring provision
All 3KL units have tapped holeson lyra contacts to allowmonitoring of fuse state usingSiemens fuse-monitor type3VU1300-MS00.
n) Suitable for AC loads, DCloads, capacitor application.
o) Mounting at 90o in thevertical plane possible.
p) Completely type tested atCPRI/ERDA.
* Single Break for 3KA 16, 1600A Switchdisconnector
3KL47 30
Positive OFFIndicator
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Contact SystemThe heart of Siemens SDF unittype 3KL is the unique movingcontact system (see illustration)comprising multiple silver platedcopper rollers which are springloaded, free to rotate around theiraxis and firmly anchored.
The spring loading is so designedthat the contact friction is minimisedand rollers rotate to avoid anytendency of locking or welding.Fixed contacts are knife blade type.Hence self cleaning feature isassured.
Advantages of the ContactSystem
• High short circuit making andwithstand capacity.Due to the multiple rollerdesign, each roller carries only afraction of the total current. Thisleads to reduction ofelectrodynamic repelling forceswhen the switch is in ‘ON’position. e.g., in 3KL61, thereare eight rollers at each breakand each roller carries 1/8th ofthe total current. When theswitch is ‘ON’, the forces ineach phase are reduced to 1/64of original.
The above feature along with thehigh closing speed of the unitresults in high making capacity.
At the same time, when thecontacts are closed, based onthe principle of increase inattraction due to electrodynamic
force between parallel currentpaths, the opening of contactsunder high short circuits [80kA(rms)] is prevented, thus leadingto high short circuit withstandcapacity.
• High breaking capacityThe high breaking capacitycorresponding to AC23Autilization category at 550V, ismainly achieved by currentsharing in multiple rollers perphase.
• Long electrical lifeDivision of current loadingexplained earlier leads toreduction in arcing time andhence lesser erosion ofcontacts thus giving longelectrical life.
• Long mechanical lifeLower operating torque, hencelonger mechanical life.
Switch disconnector unit type 3KA
Heavy duty TPN, double breakswitch disconnectors, type 3KA arealso available. The principle ofconstruction is similar to 3KL and,therefore, they have the same highperformance.
Switch disconnector fuse unit type 3KL
3KL25 30
3KL Contact System
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Selection Table for SDF unit and SD unit
Rated Suitable for HRC fuse type Order No. for SDF Order No. for SDF Order no. for Order no. forOperational unit in open unit in sheet-steel SD unit in open TIN plated SDFCurrent execution without housing without execution unit for corrosiveat 550V, 50Hz, 3ph Fuses Fuses atmosphere*
Note : SDF/SD units supplied in Siemens drawout MCC’s and PCC’s are slightly different from the ones described herein. We request youto get in touch with our nearest sales office for replacement requirements.* In case of tin plated SDFs, please contact Siemens for derating factor.
Selection Table for 3KL/3KA AccessoriesDescription 3KL47/49/50 3KL51/52 3KL54/25/31/41 3KL61/3KL81
3KA50 3KA52 3KA25/41/61 3KA10/3KA16Order No. Order No. Order No. Order No.
Switch coupler to replace old – – 8UC92 55 8UC92 553KX drive by new 8UC drive
Depth Setting Template(for quick and correct 8UC60 46mounting of 8UC drive)
+ For 3KL61 and 3KL81 only.F The 11th place of the order number indicates the alphabet type of the lock & key; combinations available are A,B,C,D,E & F.
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Technical data Data Switch disconnector fuse unit Switch disconnector unit
Maximum fuse rating for short 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10A 10Acircuit protection : delayed actioncartridge type
@ Use fuses of reputed make only +AC 21 at 500V, 50Hz ++ Flats* Higher rated voltages - on enquiry
DC Ratings of Switch disconnector fuse unit and Switch disconnector unitType Type of connection DC rating
3KL 47 Two poles in series le/DC23 at 220V = 20ATwo poles in series Three poles in series le/DC23 at 440V = 20A
3KL 49 Two poles in series le/DC23 at 220V = 32A+ve -ve Three poles in series le/DC23 at 440V = 32A
3KL50/3KA50 Two poles in series le/DC23 at 220V = 63AThree poles in series le/DC23 at 440V = 63A
3KL51 Two poles in series le/DC23 at 220V = 100AThree poles in series le/DC23 at 440V = 100A
3KL52/3KA52 Two poles in series le/DC23 at 220V = 125AThree poles in series Three poles in series le/DC23 at 440V = 125A
3KL54 Two poles in series le/DC22 at 440V = 200A3KL25/3KA25/3KL31 +ve3KL41/3KA41 Two poles in series le/DC22 at 440V = 250A3KA613KL61 To Load Two poles in series le/DC22 at 440V = 630A3KA10 L = Load3KA16 Upon Enquiry
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Type: 3KL47 3/3KL49 3/3KL50 3 (Suitable for DIN fuses)
Type: 3KL51 3 / 52 3 (Suitable for DIN fuses)
Type: 3KL47 3/3KL49 3/3KL50 3 (Suitable for bolted fuses)
Switch disconnector fuse units in open execution
All dimensions are in mm.
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Type: 3KL61 3 (Suitable for DIN fuses)
Type: 3KL81 3 (Suitable for bolted fuses)
Type: 3KL54 3/3KL25 3/3KL31 3/3KL41 3(Suitable for DIN fuses)
Switch disconnector fuse units in open execution
Switch disconnector fuse type A B C D E F
3KL54 / 3KL25 / 3KL31 234 12.5 66.5 80 4 203/217
3KL41 245 12.5 70 75 6 217
All dimensions are in mm.
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Type: 3KL47 37 / 3KL50 37 / 3KL52 37
Switch disconnector fuse units in sheet steel enclosure
Type: 3KL25 37 / 3KL41 37 / 3KL61 37
Mounting Dimensions of sheet steel housing
Type of Switch disconnector fuse A B C D E F G H I J
3KL25 37 80 4 400 300 60 215 26.5 180 176 6.5
3KL41 37 75 6 400 300 60 215 26.5 180 176 6.5
3KL61 37 95 6 400 395 96 262 25 208 223.5 2.5
Type of Switch disconnector fuse A B C D
3KL47 37 / 3KL50 37 / 3KL52 37 220 180 30 30
3KL25 37 / 3KL41 37 370 180 15 60
3KL61 37 320 208 40 96
All dimensions are in mm.
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Type: 3KA50 3
Switch disconnector units in open execution
Type: 3KA52 3
Type: 3KA25 3 / 3KA41 3 / 3KA61 3
Dimensions in mm
Switch type A B C D E F
3KA 253 234 12.5 66.5 80 4 147
3KA 413 254 12.5 66.5 80 4 147
3KA 613 270 15 70 75 6 156
All dimensions are in mm.
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Type: 3KA10 3
Type: 3KA16
All dimensions are in mm.
Switch disconnector units in open execution
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8UC6 Front Drive – Some Features
�
� Door interlock defeat facilityPush through knockout (a) and actuate with any pin to defeatdoor interlock.
� Locking facility in “OFF” position.
� Basic design
a Handle with masking frame d Fixing screws
b Gasket e Drive coupler
c Door f Operating shaft
Installation
� Mounting position for switches and rotary mechanisms with“0” position.
� Door hinge spacing.
� Tolerances of drive coupler and operating or extension shaft.
� Required position of drive coupler with respect to handle.
Pull-out strength : The pull-out strength (=being pulled of theshaft or destruction of the mechanism) of locked mechanisms is³ 800N with pulling force exerted directly on the mechanism inthe direction of the shaft.
� Removing thedoor interlockThe hooks (b)serve only tosecure duringtransport.
Mounting position of Switch Coupler for 3KL 54/25/31/41/61/81 for coupling with 8UC63 and 8UC64 drives.
�
Drive coupler
Operating orextensionshaft
Door drilling dimensions (8UC61 / 8UC62) Door drilling dimensions (8UC63 / 8UC64)
8UC6 Front Drive – Installation and adjustment dimensions
‘Product development is a continuous process. Consequently,the data indicated in this leaflet is subject to change withoutprior notice. For latest issue contact our Sales Offices.’
Sequence for mounting the 8UC drive.
1. Mount the product insidethe panel.
2. Make the cut-outs on thepanel door. (Ref. Doordrilling dimensions below)
3. Mount drive coupler on theshaft of the unit.
4. Close the panel door fully,as is the case duringoperation.
5. Adjust the drive couplerwith the help of DepthSetting Template as shown.