Safety-Rated Interlock Switches

Safety rated interlock switches are safeguarding measures designed to improve safety in situations where guards or gates are used around hazardous machinery or equipment.

What are safety rated interlock switches used for?

In industrial situations, safety rated interlock switches prevent or permit the use of machinery, depending on safety conditions. They allow current to pass to the machine when it is safe to operate, for example when the machine's guard is closed. And they cut off the power if there's a potential hazard, such as a guard being opened. When a dangerous piece of equipment such as a metalworking machine is in operation, safety rated interlock switch might be used to ensure safety gates remain closed, excluding workers from hazardous areas.

Types of safety rated interlock switches

Safety rated interlock switches vary according to their lock type, maximum current and voltage, as well as their housing material. Guard-locking switches prevent access to machine parts that may still be in motion, even when the power has been cut. Hinge switches will close protective gates and guards in unsafe conditions.


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Description Price Connection Type Lock Style Normal State Configuration Housing Material Maximum AC Voltage Maximum DC Voltage Safety Contacts Range Actuator Included Lock Type Number of Head Directions Series Auxiliary Contacts Depth
RS Stock No. 757-9231
Mfr. Part No.D4NS-1BF
BrandOmron
SGD91.23
Each
units
Screw Key 2NC Plastic 240V 250V - - - - 4 D4NS - 30mm
RS Stock No. 625-0374
Mfr. Part No.AZ15ZVRK-M20
BrandSchmersal
SGD47.41
Each
units
M20 Key 1NC Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 3 AZ15 - 75mm
RS Stock No. 820-3519
Mfr. Part No.GKMC03
BrandHoneywell
SGD169.18
Each
units
M12 Key 1NC/1NO Glass Filled PET 240V 250V - - Yes - 2 GKM - 16mm
RS Stock No. 623-3054
Mfr. Part No.AZ16-12ZVRK-M20
BrandSchmersal
SGD61.03
Each
units
M20 Key 2NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 1NO 30mm
RS Stock No. 305-1966
Mfr. Part No.XCSPA791
SGD128.91
Each
units
Screw Key 2NC Glass Fibre Reinforced PA 240V 250V - Preventa - - 8 XCSPA - 30mm
RS Stock No. 625-0330
Mfr. Part No.AZ16-02ZVRK-M20
BrandSchmersal
SGD52.45
Each
units
M20 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 - 30mm
RS Stock No. 549-619
Mfr. Part No.D4NS-4CF
BrandOmron
SGD97.65
Each
units
M20 Key 2NC/1NO Plastic 240V 250V 2NC/1NO - - - 4 D4NS - 30mm
RS Stock No. 240-8232
Mfr. Part No.D4BS15FS
BrandOmron
SGD134.48
Each
units
PG 13.5 Key 1NC/1NO Plastic 400V - 1NC/1NO - - - 4 D4BS - 43mm
RS Stock No. 549-574
Mfr. Part No.D4NS-9AF
BrandOmron
SGD171.85
Each
units
M12 Key 1NC/1NO Plastic 240V 250V 1NC/1NO - - - 4 D4NS - 30mm
RS Stock No. 549-552
Mfr. Part No.D4NS-4DF
BrandOmron
SGD91.14
Each
units
M20 Key 3NC Plastic 240V 250V 3NC - - - 4 D4NS - 30mm
RS Stock No. 623-3098
Mfr. Part No.AZ 17-11ZK
BrandSchmersal
SGD47.33
Each
units
M16 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 4 AZ17 1NO 30mm
RS Stock No. 698-8723
Mfr. Part No.EX-AZ16-12ZVRK-M20-3D
BrandSchmersal
SGD109.32
Each
units
Screw Key 2NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 EX-AZ16 1NO 30mm
RS Stock No. 625-0504
Mfr. Part No.AZ 17-02ZRK
BrandSchmersal
SGD45.37
Each
units
M16 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 4 AZ17 - 30mm
RS Stock No. 279-6400
Mfr. Part No.XCSTA791
SGD149.71
Each
units
Screw Key 2NC/1NO Glass Fibre Reinforced PA 240V 250V 2NC/1NO Preventa - - 8 XCSTA - 30mm
RS Stock No. 623-3060
Mfr. Part No.AZ16-03ZVRK-M20
BrandSchmersal
SGD60.67
Each
units
M20 Key 3NC Glass Fibre Reinforced Thermoplastic 230V 24V 3NC - - - 3 AZ16 - 30mm
RS Stock No. 198-734
Mfr. Part No.XCSTA891
SGD160.22
Each
units
Screw Key 3NC Glass Fibre Reinforced PA 240V 250V 3NC Preventa - - 8 XCSTA - 30mm
RS Stock No. 397-2150
Mfr. Part No.XCSA701
SGD271.31
Each
units
Screw Key 2NC/1NO Zamak 240V 250V 2NC/1NO Preventa - - 8 XCSA - 44mm
RS Stock No. 279-6393
Mfr. Part No.XCSTA591
SGD155.75
Each
units
Screw Key 1NC/2NO Glass Fibre Reinforced PA 240V 250V 1NC/2NO Preventa - - 8 XCSTA - 30mm
RS Stock No. 609-6704
Mfr. Part No.XCSB501
SGD342.42
Each
units
Screw Key 1NC/2NO Zamak 240V 250V 1NC/2NO Preventa - - 8 XCSB - 44mm
RS Stock No. 623-3048
Mfr. Part No.AZ16-02ZVRK-M20-2254
BrandSchmersal
SGD50.70
Each
units
M20 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 - 30mm
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