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. 178-181
Mfr. Part No.440K-T11090
£32.60
Each
Units
M20 Key 2NC/1NO Glass Filled PBT 240V 24V 2NC Trojan 5 Yes - 4 440K 1NO 52mm
RS Stock No. 427-1127
Mfr. Part No.440K-C21061
£28.20
Each
Units
M16 Key 2NC/1NO Glass Filled PBT 600V 600V 2NC Cadet 3 Yes - 8 440K 1NO 30.4mm
RS Stock No. 792-3082
Mfr. Part No.440K-T11467
£37.00
Each
Units
M20 Key 2NC/1NO Glass Filled PBT 240V 24V 2NC Trojan 5 Yes - 4 440K 1NO 52mm
RS Stock No. 351-3975
Mfr. Part No.440K-T11147
£36.00
Each
Units
M20 Key 2NC/1NO Glass Filled PBT 240V 24V 2NC Trojan 5 - - 4 440K 1NO 52mm
RS Stock No. 226-3174
Mfr. Part No.440K-B04026
£111.00
Each
Units
M20 Tongue 2NC/1NO Robust Die Cast 600V 600V 2NC Centurion Yes - 1 440K 1NO 98mm
RS Stock No. 625-0374
Mfr. Part No.AZ15ZVRK-M20
BrandSchmersal
£23.93
Each
Units
M20 Key 1NC Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 3 AZ15 - 75mm
RS Stock No. 489-4887
Mfr. Part No.440K-E33041
£23.80
Each
Units
M16 Key 2NC Glass Filled PBT 600V 600V 2NC Elf Yes - 8 440K - 29mm
RS Stock No. 251-2016
Mfr. Part No.440K-T11118
£32.60
Each
Units
M20 Key 2NC/1NO Glass Filled PBT 240V 24V 2NC Trojan 5 Yes - 4 440K 1NO 52mm
RS Stock No. 623-3054
Mfr. Part No.AZ16-12ZVRK-M20
BrandSchmersal
£29.39
Each
Units
M20 Key 2NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 1NO 30mm
RS Stock No. 350-074
Mfr. Part No.440K-B04025
£111.00
Each
Units
M20 Key 2NC/1NO Metal 500V 250V 2NC Centurion Yes - 1 440K 1NO 40.5mm
RS Stock No. 512-5671
Mfr. Part No.440K-C21098
£27.30
Each
Units
M16 Key 2NC/1NO Glass Filled PBT 600V 600V 2NC Cadet 3 Yes - 8 440K 1NO 30.4mm
RS Stock No. 394-7536
Mfr. Part No.440T-MRPSE100A
£146.00
Each
Units
- - 4NO Stainless Steel 1000V - - Prosafe - - 1 440T - 64mm
RS Stock No. 483-3567
Mfr. Part No.440K-E33040
£23.80
Each
Units
M16 Key 1NC/1NO Glass Filled PBT 600V 600V 1NC Elf Yes - 8 440K 1NO 29mm
RS Stock No. 427-1111
Mfr. Part No.440K-E33036
£23.80
Each
Units
M16 Key 1NC/1NO Glass Filled PBT 600V 600V 1NC Elf Yes - 8 440K 1NO 25mm
RS Stock No. 623-2988
Mfr. Part No.AZ16ZVRK-M20
BrandSchmersal
£25.39
Each
Units
M20 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 3 AZ16 1NO 30mm
RS Stock No. 427-1212
Mfr. Part No.440K-T11280
£31.60
Each
Units
M20 Key 2NC Glass Filled PBT 600V 600V 2NC Trojan T15 - - 2 440K - 52mm
RS Stock No. 814-7006
Mfr. Part No.XCSE7313
£338.00
Each
Units
Cable Key 2NC/1NO Zamak 240V 250V 1NC/1NO Preventa Yes - 8 XCSE - 44mm
RS Stock No. 277-2123
Mfr. Part No.440K-H11145
£176.00
Each
Units
M20 Key 2NC Glass Filled PBT 240V 250V 2NC Trojan 5-EX Yes - 4 440K - 52mm
RS Stock No. 378-1623
Mfr. Part No.440K-T11171
£48.10
Each
Units
M20 Key 3NC/1NO Glass Filled PBT 600V 600V 3NC Trojan 6 Yes - 4 440K 1NO 52mm
RS Stock No. 296-4669
Mfr. Part No.XCSPA592
£33.00
Each
Units
Screw Key 1NC/1NO Glass Fibre Reinforced PA 240V 250V 1NC/1NO Preventa - - 8 XCSPA - 30mm
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