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 Lock Type Actuator Included Housing Material Maximum AC Voltage Safety Contacts Maximum DC Voltage Range IP Rating Number of Head Directions Series Auxiliary Contacts
RS Stock No. 426-4517
Mfr. Part No.440K-T11305
£29.48
Each
Units
M20 Key 1NC/1NO - Yes Glass Filled PBT 600V 1NC 600V Trojan T15 IP67 4 440K 1NO
RS Stock No. 263-3624
Mfr. Part No.XCSA702
£75.00
Each
Units
Screw Key 2NC/1NO - - Zamak 240V 2NC/1NO 250V Preventa IP67 8 XCSA -
RS Stock No. 426-4444
Mfr. Part No.440K-C21097
£31.01
Each
Units
M16 Key 3NC - Yes Glass Filled PBT 600V 3NC 600V Cadet 3 IP67 8 440K -
RS Stock No. 427-1105
Mfr. Part No.440K-E33080
£25.70
Each
Units
M16 Key 2NC - Yes Glass Filled PBT 600V 2NC 600V Elf IP67 8 440K -
RS Stock No. 625-0330
Mfr. Part No.AZ16-02ZVRK-M20
BrandSchmersal
£25.39
Each
Units
M20 Key 2NC - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 AZ16 -
RS Stock No. 397-2150
Mfr. Part No.XCSA701
£72.20
Each
Units
Screw Key 2NC/1NO - - Zamak 240V 2NC/1NO 250V Preventa IP67 8 XCSA -
RS Stock No. 279-6400
Mfr. Part No.XCSTA791
£37.05
Each
Units
Screw Key 2NC/1NO - - Glass Fibre Reinforced PA 240V 2NC/1NO 250V Preventa IP67 8 XCSTA -
RS Stock No. 252-3864
Mfr. Part No.XCSPA591
£33.00
Each
Units
- Key 1NC/1NO - - Polyamide 240V - 250V Preventa IP67 8 XCSPA -
RS Stock No. 427-1177
Mfr. Part No.440K-T11303
£31.01
Each
Units
M20 Key 2NC - - Glass Filled PBT 600V 2NC 600V Trojan T15 IP67 4 440K -
RS Stock No. 623-3048
Mfr. Part No.AZ16-02ZVRK-M20-2254
BrandSchmersal
£25.39
Each
Units
M20 Key 2NC - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 AZ16 -
RS Stock No. 252-3757
Mfr. Part No.XCSA501
£72.20
Each
Units
Screw Key 1NC/2NO - - Zamak 240V 1NC/2NO 250V Preventa IP67 8 XCSA -
RS Stock No. 623-3004
Mfr. Part No.AZ16ZVRK-M20-2254
BrandSchmersal
£25.39
Each
Units
M20 Key 1NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ16 1NO
RS Stock No. 792-3089
Mfr. Part No.440K-T11338
£47.84
Each
Units
M20 Key 2NC/1NO - Yes Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 4 440K 1NO
RS Stock No. 623-2972
Mfr. Part No.AZ15ZVRK-M20-2254
BrandSchmersal
£23.93
Each
Units
M20 Key 1NC - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ15 -
RS Stock No. 362-2782
Mfr. Part No.AZ16-12ZI-B1-M20
BrandSchmersal
£57.05
Each
Units
M20 Key 2NC/1NO - Yes Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 AZ16 1NO
RS Stock No. 698-8723
Mfr. Part No.EX-AZ16-12ZVRK-M20-3D
BrandSchmersal
£56.35
Each
Units
Screw Key 2NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 EX-AZ16 1NO
RS Stock No. 378-1645
Mfr. Part No.440K-MT55001
£61.81
Each
Units
M20 Key 2NC/1NO - - Painted Zinc 500V 2NC 250V MT-GD2 IP67 8 440K 1NO
RS Stock No. 498-911
Mfr. Part No.3SE5112-0QV10
BrandSiemens
£56.20
Each
Units
M20 Key 2NC/1NO - - Metal 230V - 230V Sirius IP66, IP67 5 3SE5 2NC/1NO
RS Stock No. 305-1966
Mfr. Part No.XCSPA791
£33.00
Each
Units
Screw Key 2NC - - Glass Fibre Reinforced PA 240V - 250V Preventa IP67 8 XCSPA -
RS Stock No. 623-3105
Mfr. Part No.AZ 17-02ZK
BrandSchmersal
£27.50
Each
Units
M16 Key 2NC - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 4 AZ17 -