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. 623-2988
Mfr. Part No.AZ16ZVRK-M20
BrandSchmersal
MYR176.05
Each
units
M20 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 3 AZ16 1NO 30mm
RS Stock No. 153-141
Mfr. Part No.GKNC21
BrandHoneywell
MYR394.49
Each
units
M20 Key 2NC/1NO Glass Filled PET 600V 250V 2NC/1NO - - - 4 GKN - 33mm
RS Stock No. 836-2766
Mfr. Part No.D4NS1FF
BrandOmron
MYR165.69
Each
units
PG 13.5 Key 2NC/1NO Plastic 240V 250V - - No - 4 D4NS - 30.6mm
RS Stock No. 861-4650
Mfr. Part No.D4NS-2CF
BrandOmron
MYR236.56
Each
units
G1/2 Key 2NC/1NO Plastic 240V 250V - - Yes - 4 D4NS - 96mm
RS Stock No. 700-4292
Mfr. Part No.XCSPA593
MYR186.75
Each
units
Screw Clamp Key NO/NC Glass Fibre Reinforced PA 240V 250V NO/NC Preventa - - 4 XCSPA - 30mm
RS Stock No. 263-3624
Mfr. Part No.XCSA702
MYR739.58
Each
units
Screw Key 2NC/1NO Zamak 240V 250V 2NC/1NO Preventa - - 8 XCSA - 44mm
RS Stock No. 240-8232
Mfr. Part No.D4BS15FS
BrandOmron
MYR295.75
Each
units
PG 13.5 Key 1NC/1NO Plastic 400V - 1NC/1NO - - - 4 D4BS - 43mm
RS Stock No. 623-3060
Mfr. Part No.AZ16-03ZVRK-M20
BrandSchmersal
MYR176.44
Each
units
M20 Key 3NC Glass Fibre Reinforced Thermoplastic 230V 24V 3NC - - - 3 AZ16 - 30mm
RS Stock No. 623-3054
Mfr. Part No.AZ16-12ZVRK-M20
BrandSchmersal
MYR213.46
Each
units
M20 Key 2NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 1NO 30mm
RS Stock No. 820-3507
Mfr. Part No.GKMB33
BrandHoneywell
MYR443.03
Each
units
Cable Key 1NC/1NO Glass Filled PET 240V 250V - - Yes - 2 GKM - 16mm
RS Stock No. 623-3098
Mfr. Part No.AZ 17-11ZK
BrandSchmersal
MYR163.83
Each
units
M16 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 4 AZ17 1NO 30mm
RS Stock No. 623-2972
Mfr. Part No.AZ15ZVRK-M20-2254
BrandSchmersal
MYR143.66
Each
units
M20 Key 1NC Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 3 AZ15 - 75mm
RS Stock No. 549-552
Mfr. Part No.D4NS-4DF
BrandOmron
MYR255.22
Each
units
M20 Key 3NC Plastic 240V 250V 3NC - - - 4 D4NS - 30mm
RS Stock No. 623-3105
Mfr. Part No.AZ 17-02ZK
BrandSchmersal
MYR142.23
Each
units
M16 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 4 AZ17 - 30mm
RS Stock No. 700-4302
Mfr. Part No.XCSPA793
MYR227.06
Each
units
Screw Clamp Key 2NC Glass Fibre Reinforced PA 240V 250V 2NC Preventa - - 4 XCSPA - 30mm
RS Stock No. 549-502
Mfr. Part No.D4NS-9BF
BrandOmron
MYR486.64
Each
units
M12 Key 2NC Plastic 240V 250V 2NC - - - 4 D4NS - 30mm
RS Stock No. 625-0330
Mfr. Part No.AZ16-02ZVRK-M20
BrandSchmersal
MYR168.50
Each
units
M20 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 - 30mm
RS Stock No. 198-734
Mfr. Part No.XCSTA891
MYR203.59
Each
units
Screw Key 3NC Glass Fibre Reinforced PA 240V 250V 3NC Preventa - - 8 XCSTA - 30mm
RS Stock No. 549-558
Mfr. Part No.D4NS-8CF
BrandOmron
MYR374.72
Each
units
M20 Key 2NC/1NO Plastic 240V 250V 2NC/1NO - - - 4 D4NS - 30mm
RS Stock No. 861-4641
Mfr. Part No.D4GS-N2T
BrandOmron
MYR321.87
Each
units
Cable Key 2NC Plastic 240V 250V 1NC - - - 2 D4GS 1NC 95.5mm