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Selection and Application of Safety Interlock Switches
Historically non-safety-rated proximity sensorsand mechanical limit switches have been
misapplied and used for personnel safetyapplications. These devices are not specificallydesigned for safeguarding applications. They areeasy to defeat or bypass, and prone to failuremodes which lead to potentially dangeroussituations.
Newer design and application standards haveaddressed this issue by requiring coded systemsthat cannot be easily defeated with such readilyavailable objects as tape, magnets, or metalobjects. Manufacturers have responded with newdesigns that satisfy safety use requirements.Mechanical devices with positive-openingoperation of the safety contacts have differentiatedthe design of switches intended for safety usefrom that of standard components.
Safety interlocking device application and designrequirements are addressed by several domestic,international and regional standards, including:
• ANSI B11.19, Safeguarding Requirements whenReferenced by other B11 Standards,
• ANSI/RIA R15.06, Safety Requirements forIndustrial Robots and Robot Systems, and
• ISO 14119 and EN1088, Safety of Machinery –Interlocking Devices Associated with Guards.
Selection and Application of Safety Interlock Switches
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Safety Interlocking
It is important that the integration of safetyinterlocks, used as part of a safety system
design, fulfill the safety requirements ofredundancy and monitoring functions in order tomaintain a high level of system integrity (see page20 for safety system performance). While safetyinterlocks are designed for safeguardingapplications, many are simple mechanical systemsthat can fail in an “on” state, under certaincircumstances. Possible mechanical and electricalfailures of these devices must be considered whenincorporating integrity into a safety system design.Possible failure modes include:
• Short circuits across the outputs,• Actuator fastener breakage, and• Physical damage to the interlocking device.
Because of their positive-opening designrequirements, a mechanical safety interlock devicemay fail with its safety contacts closed, should itshead be sheared off or removed.
To obtain a high level of safety system integrityusing safety interlock devices, it is usuallynecessary to use two devices and a safety controlsystem that continuously monitors both devicesfor concurrent operation (see dual channelmonitoring on page 21).
Installation
The physical installation of the mechanicalinterlocking devices is critical to the reliability
of the system. The application standards whichdetail the use and installation of these devices giveguidance on critical issues that affect systemintegrity. Some common problems include:
• Using the safety interlock as an end oftravel doorstop,
• Unreliable fasteners,• Improper use of mounting holes, and • Improper actuator alignment and/or doors
that do not have repeatable position,causing physical damage to the mechanicalinterlock.
Special flexible and adjustable actuators can helpin resolving some of these issues.
It is important for the designer to select the rightsafety interlock for each application. Although thesize and price of light-duty plastic devices may beattractive, a larger metal safety interlock, carryinga higher price, may be more appropriate – and inthe long run be a better value – for harsh-dutyapplications.
Use two safety interlock devices and a safety module for ahigh level of integrity.
Selection and Application of Safety Interlock Switches
Safety Interlock Types
Avariety of safety interlock designs address theunique requirements of safeguarding
applications. The goals of all designs include:
• Reducing defeat potential,• Providing reliable operation of the safety outputs• Reliably monitoring the function of the device, and• Withstanding expected environmental
influences that could introduce faults.
Standard Mechanical Safety Interlocks
One of the most common types of safetyinterlock is what the international andEuropean standards call a functional
category 2 device. A functional category 2 safetyinterlock has two components: the safetyinterlocking housing and a separate, codedactuator. The actuator is usually mounted on thegate, and is aligned to a slot in the housing, whichis mounted on the structure.
Once the actuator is fullynested into the housing,
the safety contacts close,allowing the machine
to run. When thegate opens, thesafety contactsare forced openby a mechanical
action referred to aspositive opening, which
sends a stop signal to the machine. Positiveopening is required for safety application use; itensures direct mechanical action in opening thesafety contacts and does not depend on springs toperform the safety function. Even in a weldedcontact condition, the safety contacts are designedto break open – resulting in a stop signal.
Rotary and Hinged SafetyInterlocks
Rotary and hinge devicesare designed to mount on the
hinged side of an access door.They are termed functional category 1 devices bythe international and European standards systems.In effect, functional category 1 safety interlockshave one-piece construction; the actuator is anintegral part of the housing. Thesedevices have no slot or nest wheredirt or other materials can collectand cause problems. Andbecause they are usuallymounted out-of-the-way inthe machine frame, they areless likely to be exposed toairborne dirt, oil and mist, ortampering.
Guard Locking Safety Interlocks
Guard locking devices have a separateactuator, and use a solenoid system tolock the engaged actuator in place. The
solenoid not only monitors the gate for open orclosed position, but also holds the gate closed,preventing access to the machine until it is verifiedthat the machine is in a safe state. These devicescan be useful for machines that have relatively longstop times and where entering the machine duringthe process can cause damage to material (inaddition to the injury issue). The control signal thatunlocks the door likely comes from a safety-ratedstop-motion-detection system or safety timer.
The two most common locking modes for guardlocking devices are spring locking and powerlocking. Spring locking holds the gate closedwhen there is no power to the solenoid and ispreferred for personnel guarding applications
Selection and Application of Safety Interlock Switches
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because the locked state does not require anexternal positive signal. Spring-locking devicesmust have a means of manually overriding thelock to allow machine maintenance(lockout/tagout procedures). The override mustalso be limited to authorized personnel. Power
locking requires thesolenoid to beenergized by anexternal control devicein order to achieve thelocked state. Considerpossible solenoidfailure modes, suchas broken wires,supply voltage failureand failed solenoidcoils, before using
power-locking devices to safeguard personnel.
Magnetic Safety Interlocking
When standard mechanical safetyinterlocks do not fit application needs due
to environmental issues, size, or mechanicallimitation, magnetic safety interlocking may be anoption. Although several domestic, internationaland European standards warn against use ofsimple proximity devices for gate monitoring,specially-designed magnetic safety interlocksystems have been introduced into the market forpersonnel safeguarding application. A magneticsafety interlock has a sensor and a magneticallycoded actuator. Within the sensor are multiplemagnetically-actuated reed contacts that mustmatch up with a specifically-coded actuator, inorder for the machine to run. This magneticcoding is not only redundant in design, but alsodefends against bypass using a simple magnet.
Benefits of magnetic interlocks include theirrelatively small size, higher housing protectionrating and non-contactoperation. Because theactuator does not needto make physicalcontact with thesensor, such factors asmetal fatigue, cloggedactuator slots and closetolerance are not anissue.
Use the selection chart on the following page tolocate the appropriate Banner device for yourapplication.
Flat Pack Style Safety Interlock Switches – Model Selection
75 mm and 90 mm Series Flat Pack Style Switches• Positive opening safety contacts (IEC 60947-5-1) (not dependent upon springs)
• Mechanically-coded actuators utilize two independent operating elements to minimize intentionaltampering or defeat
• Rotating head allows actuator engagement from front or back or either of two top positions
• Choice of four standard actuators; special high extraction force actuator is available as option(see page 198)
• NEMA 4, IEC IP65 switch housing rating may be increased to NEMA 4X, IEC IP67 with additionof screw to wiring chamber door
• Insulated device (IEC 60947-5-1) on all models with plastic housings
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closed safetycontact is fully open.
Flat Pack Style Safety Interlock Switches – Model Selection
Standard Actuator Features
M5 (#10) Clearance
Snap-on Cap
SI-QS-SSAIn-line Actuator
Choose the in-line actuator for applicationssuch as sliding doors, or covers that liftstraight off, or on hinged doors with aradius of 150 mm (6"), or greater. A one-way snap-on cap is supplied to discourageunauthorized removal of the actuatormounting hardware. The actuator is die-caststainless steel.
SI-QS-HMAHorizontal Radius Actuator
Use this actuator on hinged doorswith a radius of 50 mm (2"), orgreater. Once the angle is set, theactuator is flexible in twodirections. The actuator is die-castaluminum.
SI-QS-VMAVertical Radius Actuator
Use this actuator on hinged doors with aradius of 50 mm (2"), or greater. Once theangle is set, the actuator has flexibility intwo directions. The actuator is die-castaluminum.
SI-QS-FSAFlexible Actuator
Use this actuator on hinged doorswith a radius of 150 mm (6"), orgreater. This flexible actuator isused on doors where there ismisalignment or vibration. Theactuator is die-cast aluminum.
Also available: A high-extraction-force actuator (see Accessories, page 197).
Features - Rotating Actuator Head
The actuator head may be rotated 180º to create four possible actuator engagement locations.
Environmental Rating NEMA 4, IEC IP65Note: Addition of a No. 3 x 1/4" screw (max) to the wiring access door increases sealing to
IEC IP67, NEMA 4X
Silver-nickel alloy
Application Notes
Maximum Switching Speed 30 operations per minute
Models with one and two contacts have three cable entry locations (bottom and two sides); models withthree contacts have two cable entry locations (two sides). All entry locations are sealed with knockouts.
To remove knockouts, thread the supplied Pg 11 to 1/2" - 14 NPT conduit adapter or optional Pg 11 cablegland into one of the threaded entry locations. The knockout will break open just before the adapter orcable gland bottoms out.
Operating Temperature -30° to +80ºC (-22° to +176ºF)
Weight
Maximum Actuator Speed 1 m/second (39"/second)
Actuator Extraction Force 10 Newtons (2.2 lbf); High Force - 50 Newtons (11.25 lbf)
Minimum ActuatorEngagement Radius
In-line actuators: 150 mm (6")Adjustable actuators: 50 mm (2") in two directionsFlexible actuators: 50 mm (2") in all directions
SI-QS75 models: 0.11 kg (0.25 lb)SI-QS90 models: 0.13 kg (0.29 lb)
Certifications
Short Circuit Protection 6 amp Slow Blow, 10 amp Fast Blow. External fusing or overload protection is recommended.
Wire Connections Screw terminals with pressure plates accept the following wire sizes –For switches with one or two contacts:Stranded and solid: 20 AWG (0.5 mm2) to 16 AWG (1.5 mm2) for one wireStranded: 20 AWG (0.5 mm2) to 18 AWG (1.0 mm2) for two wires
For switches with three contacts:Stranded and solid: 20 AWG (0.5 mm2) to 18 AWG (1.0 mm2) for one wireStranded: 20 AWG (0.5 mm2) to 18 AWG (1.0 mm2) for two wires
Cable Entry Pg 11 threaded entrance. Adapter supplied to convert Pg 11 to 1/2" - 14 NPT threaded entrance. (See Application Notes, below).
Construction Glass fiber-reinforced polyamide thermoplastic housing UL94-VO rating
European Rating Utilization categories: AC15 and DC13 (IEC 60947-5-1)Switches with 1 & 2 contact pairs:Ui = 500V ac, Ith = 10ASwitches with 3 contact pairs:Ui = 400V ac, Ith = 5A
SI-QS-SSAFor doors or covers with a radius of 150 mm (6"), or greater. A one-way snap-oncap is supplied to discourage unauthorized removal of the actuator mountinghardware.
Horizontal Radius
SI-QS-HMA For hinged doors with a radius of 50 mm (2") or greater.
Vertical Radius
SI-QS-VMA For hinged doors with a radius of 50 mm (2") or greater.
Flexible
SI-QS-FSA For doors or covers where alignment is difficult to maintain. Flexes in all directions.
WARNING!Spare actuators must NEVER be used to bypass or otherwise defeat the protective function of asafety switch. To do so may create an unsafe situation which could lead to serious injury or death.!
Limit Switch Style Safety Interlock Switches – 83 mm and 100 mm Model Selection
SI-LS83/100 Series Switches• Positive opening safety contacts (IEC 60947-5-1) (not dependent upon springs)• Limit switch design (EN 50047)• Mechanically-coded actuators utilize two independent operating elements to minimize
intentional tampering or defeat• Rotating head allows actuator engagement from four sides or four top positions; no tools
are required to rotate head• Low-profile design for limited space requirements; only 30.5 mm (1.3") depth• Tough, glass-reinforced thermoplastic housing; metal actuator• Choice of two in-line actuators, two adjustable radius actuators or a flexible actuator
• Insulated device (IEC 60947-5-1)
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closedsafety contact is fully open.
†Contacts: Open Closed Transition
SI-LS100SF
25 26
33 34
15 16
25 26
33 34
15 16
7.6 (0.30)8.3 (0.33)
0 (0)
15-1
625
-26
33-3
4
8.8 (0.35)
21.5 (0.85)mm (in)
Engaged
Disengaged
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SI-LS100SRAF
SI-LS100MRHF
SI-LS100MRVF
SI-LS100MRFF
Actuator TypeContact Configuration(Actuator Engaged) Switching Diagram†Model Number
Straight In-line
Horizontal
Vertical
Flexible
Right-angle In-line
Contact Configuration(Actuator Removed)
SI-LS100 Series Safety Switches – Two N.C. and One N.O. Contact
Right-angle In-line
Model Number Actuator TypeContact Configuration(Actuator Removed)
Limit Switch Style Safety Interlock Switches – 83 mm and 100 mm Model Selection
Standard Actuator Features
SI-QS-SSA-2/-3In-line Actuator
Choose the in-line actuator for applicationssuch as sliding doors, or covers that liftstraight off, or on hinged doors with aradius of 150 mm (6"), or greater. Modelsavailable for straight or right anglemounting. These actuators are stampedstainless steel.
SI-QS-HMAHorizontal Radius Actuator
Use this actuator on hinged doorswith a radius of 50 mm (2"), orgreater. Once the angle is set, theactuator is flexible in twodirections. The actuator is die-castaluminum.
SI-QS-VMAVertical Radius Actuator
Use this actuator on hinged doors with aradius of 50 mm (2"), or greater. Once theangle is set, the actuator has flexibility intwo directions. The actuator is die-castaluminum.
SI-QS-FSAFlexible Actuator
Use this actuator on hinged doorswith a radius of 150 mm (6"), orgreater. This flexible actuator isused on doors where there ismisalignment or vibration. Theactuator is die-cast aluminum.
Limit Switch Style Safety Interlock Switches – 40 mm Model Selection
SI-LM40 Series Switches with In-Line Actuators• Positive opening safety contacts (IEC 60947-5-1) (not dependent upon springs)
• Standard limit switch metal housing (EN 50041)
• In-line and flexible actuator models
• Protective Earth Terminal (IEC 60947-1)
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closedsafety contact is fully open.
SI-LM40MKH.. Series Safety Interlock Switch Dimensions
90º
Features - Rotating Actuator Head and Flexible In-Line Actuator Flange Orientation
The actuator head may be rotated in 90º increments. Note regarding the flexible actuator:The flexible actuator mounting flange may be rotated 90° withrespect to the actuator position. To rotate, push the flange in thedirection of actuation, turn the flange either direction, and releaseto lock the flange in the new position.
• Protective Earth Terminal (IEC 60947-1) on models with metal housings
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closedsafety contact is fully open.
Limit Switch Style Safety Interlock Switches – 31 mm Model Selection
SI-LS31R Series Switches with Rotary Hinge Actuator• Positive opening safety contacts (IEC 60947-5-1) (not dependent upon springs)
• Limit switch design (EN 50047)
• Rotating shaft connects directly to door hinge
• Glass-reinforced thermoplastic switch housing with plated steel actuator
• Actuator head rotatable in 90 degree increments
• Insulated device (IEC 60947-5-1) on all models with plastic housings
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closedsafety contact is fully open.
SI-LS31RTD Rotary Shaft
23 24
1211
0º/360º
23 24
1211
>45º30º10º0º
45º
315º
350º330º
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Models Actuator Type
Contact Configuration(Axle in home position = 0º)
Contact Configuration(Axle Rotated 45º in
either direction) Switching Diagram†
†Contacts: Open Closed Transition
SI-LS31RTE Rotary Shaft
21 22
1211
0º/360º
21 22
1211
>45º
30º10º0º
45º
350º330º
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11-1
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SI-LS31R Series Safety Switches with Rotary Hinge Actuator
Limit Switch Style Safety Interlock Switches – 31 mm Model Selection
SI-LS31H Series Switches with Hinged Lever Actuator• Positive opening safety contacts (IEC 60947-5-1) (not dependent upon springs)• Limit switch design (EN 50047)
• For use on doors or flaps
• Glass-reinforced thermoplastic switch housing with plated steel actuator
• Actuator head rotatable in 90 degree increments
• Insulated device (IEC 60947-5-1)
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closedsafety contact is fully open.
SI-LS31HGDVertical Hinged
Lever ±90º
23 24
11 12
0º
23 24
11 12
0º
90º90º
±8º±5º0º
±10º
±90º
11-1
223
-24
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SI-LS31HGEVertical Hinged
Lever ±90º
21 22
11 12
0º
21 22
11 12
0º
90º90º
±8º±5º0º
±90º
11-1
221
-22
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Models Actuator Type
Contact Configuration(Lever in normal
position)Contact Configuration
(Lever rotated) Switching Diagram†
†Contacts: Open Closed Transition
SI-LS31H Series Safety Switches with Hinged Lever Actuator
Maximum Switching Speed SI-LM40MH.., SI-LS31H and SI-LS31R models: 50 operations per minuteSI-LS83 and SI-LS100 models: 30 operations per minuteSI-LM40MKV models: 10 operations per minute
Utilization categories: AC15 and DC13Switches with 1 & 2 contact pairs:Ui = 500V ac, Ith = 10ASwitches with 3 contact pairs:Ui = 400V ac, Ith = 5A
Operating Temperature -30° to +80ºC (-22° to +176ºF)
SI-LS31H and SI-LS31R models: 0.09 kg (0.20 lb)SI-LM40MKV models: 0.31 kg (0.68 lb)SI-LM40MKH.. models: 0.34 kg (0.75 lb)SI-LS83 models: 0.12 kg (0.26 lb)SI-LS100 models: 0.13 kg (0.29 lb)
Certifications
Short Circuit Protection 6 amp Slow Blow, 10 amp Fast Blow. External fusing or overload protection is recommended.
Wire Connections Screw terminals with pressure plates accept the following wire sizes –Stranded and solid: 20 AWG (0.5 mm2) to 16 AWG (1.5 mm2) for one wireStranded: 20 AWG (0.5 mm2) to 18 AWG (1.0 mm2) for two wires
Cable Entry 40 mm switches: Pg 13.5 threaded entranceAdapter supplied to convert from Pg 13.5 to 1/2" - 14 NPT threaded entrance
All other switches: Pg 11 threaded entranceAdapter supplied to convert from Pg 11 to 1/2" - 14 NPT threaded entrance
Construction Models with plastic switch housing: Glass fiber-reinforced thermoplastic UL94-VO ratingModels with metal housing: Aluminum alloy die cast
1 million operations (exception: 25,000 operations for SI-LM40MKV models)
40-60 HzUeV
Ie/AC-15A
Ie/DC-13A
24 10 6110 10 1230 6 .4
Minimum ActuatorEngagement Radius
In-line actuators for 40 mm switches: 800 mm (32")In-line actuators for 31 mm switches: 400 mm (16")Flexible actuators for 40 mm switches: 150 mm (6")
Required Actuation Force In-line type actuators: 10 N (2.2 lbf); SI-LM40MKV models: 20 N (4.4 lbf)Axle type hinge actuators: 10 N cm (0.9 lbf in)Lever type hinge actuators: 15 N cm (1.3 lbf in)
WARNING!Spare actuators must NEVER be used to bypass or otherwise defeat the protective function of asafety switch. To do so may create an unsafe situation which could lead to serious injury or death.!
ModelUsed with
Switch ModelsType
Flexible In-line Metal
SI-QM-90A SI-LM40MKVDSI-LM40MKVE
Flexible In-line Metal
SI-QM-SMFA
All40 mm switches
except forSI-LM40MKVDSI-LM40MKVE
Vertical Radius
SI-QS-VMA SI-LS83 andSI-LS100 models
Flexible
SI-QS-FSA SI-LS83 andSI-LS100 models
Application
For doors or covers where alignment is difficult tomaintain. Flexes in all directions. Minimum engagementradius for hinged closures is 150 mm (6").
For doors or covers where alignment is difficult tomaintain. Flexes in all directions. Minimumengagement radius for hinged closures is 150 mm (6").
For hinged closures with a radius of 50 mm (2"), orgreater. Once the actuator angle is set, it is flexible intwo directions. Actuator position is adjustable in oneorientation, as shown.
For doors or covers where alignment is difficult tomaintain. Flexes in all directions. Minimumengagement radius for hinged closures is 150 mm (6").
In-line Metal
SI-QM-SSA
All40 mm switches
except forSI-LM40MKVDSI-LM40MKVE
For doors or covers with accurate alignment, such assliding doors. Minimum engagement radius for hinged closures is 400 mm (16").
In-line
SI-QS-SSA-2 SI-LS83 andSI-LS100 models
Horizontal Radius
SI-QS-HMA SI-LS83 andSI-LS100 models
For doors or covers with accurate alignment, such assliding doors. Minimum engagement radius for hingedclosures is 150 mm (16")
For hinged closures with a radius of 50 mm (2"), orgreater. Actuator position is adjustable in one orientation,as shown. Once the actuator angle is set, it is flexible intwo directions.
In-line
SI-QS-SSA-3 SI-LS83 andSI-LS100 models
For doors or covers with accurate alignment, such assliding doors. Right-angle mounting flange. Minimumengagement radius for hinged closures is 150 mm (16").
Locking Style Safety Interlock Switches – 42 mm Model Selection
SI-LS42 Series Switches• Positive opening safety contacts (IEC 60947-5-1) (not dependent upon springs)
• Insulated device (IEC 60947-5-1)
• Choice of two locking mechanism types:- Spring lock with energized solenoid release- Energized solenoid lock with spring unlock
• Two solenoid voltages available:- 24V ac/dc- 24 to 48V dc or 24 to 230V ac
• Choose either of two stainless steel actuator types:- Rigid in-line- Flexible in-line
• Actuator head rotatable in 90° increments and can be positioned for either horizontal orvertical actuation
• Choice of three switching contact configurations (with actuator engaged):- 1 normally-open plus 1 normally-closed- 2 normally-closed- 2 normally-closed plus 1 normally-open
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closedsafety contact is fully open.
RigidIn-line
ActuatorType
SI-LS42DMSG 24V ac/dc
13 14
21 22
13 14
21 22 0 (0)
11.3 (0.45)12.5 (0.49)14.7 (0.58)
41 (1.61)mm (in)
Engaged
Disengaged
21-2
213
-14
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24-48V dc24-230V ac
SI-LS42DMSGF
SI-LS42UMSG
ModelsSolenoidVoltage
Contact Configuration(Actuator Engaged
and Locked)
Contact Configuration(Actuator Unlocked
and Removed) Switching Diagram†
SI-LS42UMSGF24-48V dc24-230V ac
FlexibleIn-line
RigidIn-line
SI-LS42DMSH 24V ac/dc
21 22
11 12
21 22
11 12 0 (0)
11.3 (0.45)
14.7 (0.58)
41 (1.61)mm (in)
Engaged
Disengaged
11-1
221
-22
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24-48V dc24-230V ac
SI-LS42DMSHF
SI-LS42UMSH
FlexibleIn-line
SI-LS42UMSHF24-48V dc24-230V ac
Solenoid MonitorContacts
Solenoid MonitorContacts
Actuator Contacts Actuator Contacts
43 44
31 32
E1 E2
43 44
31 32
E1 E2
Solenoid MonitorContacts
Solenoid MonitorContacts
Actuator Contacts Actuator Contacts
43 44
31 32
E1 E2
43 44
31 32
E1 E2
†Contacts: Open Closed Transition
SI-LS42 Series Safety Switches with Spring Lock and Solenoid Unlock
Locking Style Safety Interlock Switches – 42 mm Model Selection
SI-QM-SSA Features - Rigid In-Line Actuator
SI-QM-SMFA Features - Flexible In-Line Actuator Flange Orientation
20.0 mm(0.79")
7.5 mm(0.30")
15 mm(0.59")
80.0 mm(3.13")
ø 4.8 mm(2 Holes)
40 mm(1.6")
29 mm(1.1")
CL
50 mm(2.0")
81 mm(3.2")
41 mm(1.6")
ø 5.5 mm(0.22")
400 mm (16") minimum actuator engagement radius
150 mm (6") minimum actuator engagement radius Note regarding the flexible actuator:The flexible actuator mounting flange may be rotated 90° withrespect to the actuator position. To rotate, push the flange in thedirection of actuation, turn the flange either direction, and releaseto lock the flange in the new position.
Locking Style Safety Interlock Switches – 100 mm Model Selection
SI-QM100 Series Switches• Positive opening safety contacts (IEC 60947-5-1) (not dependent upon springs)
• Protective Earth Terminal (IEC 60947-1)
• Actuators are keyed to discourage intentional tampering or defeat
• Choice of two locking mechanism types:- Spring lock with energized solenoid unlock- Energized solenoid lock with spring unlock
• Both types are available with choice of 24V dc, 120V ac, or 230V ac solenoid operatingvoltage
• Actuator head rotatable in 90° increments
• Monitor contacts for both switching contact and solenoid status
• Standard mounting hole pattern (EN 50041)
NOTE: This symbol for a positive opening safety contact (IEC 60947-5-1) is used in theSwitching Diagrams to identify the point in actuator travel where the normally-closedsafety contact is fully open.
Locking Style Safety Interlock Switches – 100 mm Model Selection
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Important Note:Be certain that the actuator is fully engaged before removing theactuator head screws during the rotation process.
Actuator Features - head may be rotated in 90° increments.
SI-QM-SSA Rigid In-Line Actuator Dimensions
SI-QM-SMFA Flexible In-Line Actuator Dimensions
20.0 mm(0.79")
7.5 mm(0.30")
15 mm(0.59")
80.0 mm(3.13")
ø 4.8 mm(2 Holes)
40 mm(1.6")
29 mm(1.1")
CL
50 mm(2.0")
81 mm(3.2")
41 mm(1.6")
ø 5.5 mm(0.22")
400 mm (16") minimum actuator engagement radius
150 mm (6") minimum actuator engagement radius Note regarding the flexible actuator:The flexible actuator mounting flange may be rotated 90° withrespect to the actuator position. To rotate, push the flange in thedirection of actuation, turn the flange either direction, and releaseto lock the flange in the new position.
WARNING!Spare actuators must NEVER be used to bypass or otherwise defeat the protective function of asafety switch. To do so may create an unsafe situation which could lead to serious injury or death.!
ModelUsed with
Switch ModelsType
Flexible In-line Metal
SI-QM-SMFA SI-LS42
Application
For doors or covers where alignment is difficult tomaintain. Flexes in all directions. Minimumengagement radius for hinged closures is 150 mm (6").
In-line Metal
SI-QM-SSA AllFor doors or covers with accurate alignment, such assliding doors. Minimum engagement radius for hingedclosures is 400 mm (16").