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. 178-181
Mfr. Part No.440K-T11090
£35.19
Each
Units
M20 Key 2NC/1NO Interlock Yes Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 4 440K 1NO
RS Stock No. 427-1127
Mfr. Part No.440K-C21061
£30.50
Each
Units
M16 Key 2NC/1NO Interlock Yes Glass Filled PBT 600V 2NC 600V Cadet 3 IP67 8 440K 1NO
RS Stock No. 792-3082
Mfr. Part No.440K-T11467
£39.98
Each
Units
M20 Key 2NC/1NO Interlock Yes Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 4 440K 1NO
RS Stock No. 351-3975
Mfr. Part No.440K-T11147
£38.86
Each
Units
M20 Key 2NC/1NO Interlock - Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 4 440K 1NO
RS Stock No. 226-3174
Mfr. Part No.440K-B04026
£120.79
Each
Units
M20 Tongue 2NC/1NO Interlock Yes Die Cast Metal 600V 2NC 600V Centurion IP66 1 440K 1NO
RS Stock No. 625-0374
Mfr. Part No.AZ15ZVRK-M20
BrandSchmersal
£23.93
Each
Units
M20 Key 1NC - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ15 -
RS Stock No. 489-4887
Mfr. Part No.440K-E33041
£25.70
Each
Units
M16 Key 2NC Interlock Yes Glass Filled PBT 600V 2NC 600V Elf IP67 8 440K -
RS Stock No. 251-2016
Mfr. Part No.440K-T11118
£35.19
Each
Units
M20 Key 2NC/1NO Interlock Yes Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 4 440K 1NO
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 2NC 24V - IP67 3 AZ16 1NO
RS Stock No. 350-074
Mfr. Part No.440K-B04025
£120.79
Each
Units
M20 Key 2NC/1NO - Yes Metal 500V 2NC 250V Centurion IP66 1 440K 1NO
RS Stock No. 512-5671
Mfr. Part No.440K-C21098
£29.48
Each
Units
M16 Key 2NC/1NO - Yes Glass Filled PBT 600V 2NC 600V Cadet 3 IP67 8 440K 1NO
RS Stock No. 394-7536
Mfr. Part No.440T-MRPSE100A
£155.30
Each
Units
- Trapped Key 4NO Interlock - Stainless Steel 1000V - - Prosafe IP20 1 440T -
RS Stock No. 483-3567
Mfr. Part No.440K-E33040
£25.70
Each
Units
M16 Key 1NC/1NO Interlock Yes Glass Filled PBT 600V 1NC 600V Elf IP67 8 440K 1NO
RS Stock No. 427-1111
Mfr. Part No.440K-E33036
£25.70
Each
Units
M16 Key 1NC/1NO - Yes Glass Filled PBT 600V 1NC 600V Elf IP67 8 440K 1NO
RS Stock No. 623-2988
Mfr. Part No.AZ16ZVRK-M20
BrandSchmersal
£25.39
Each
Units
M20 Key 1NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ16 1NO
RS Stock No. 427-1212
Mfr. Part No.440K-T11280
£34.17
Each
Units
M20 Key 2NC - - Glass Filled PBT 600V 2NC 600V Trojan T15 IP67 2 440K -
RS Stock No. 814-7006
Mfr. Part No.XCSE7313
£338.00
Each
Units
Cable Key 2NC/1NO - Yes Zamak 240V 1NC/1NO 250V Preventa IP67 8 XCSE -
RS Stock No. 277-2123
Mfr. Part No.440K-H11145
£189.81
Each
Units
M20 Key 2NC - Yes Glass Filled PBT 240V 2NC 250V Trojan 5-EX IP67 4 440K -
RS Stock No. 378-1623
Mfr. Part No.440K-T11171
£51.77
Each
Units
M20 Key 3NC/1NO - Yes Glass Filled PBT 600V 3NC 600V Trojan 6 IP67 4 440K 1NO
RS Stock No. 251-2022
Mfr. Part No.440K-T11123
£43.04
Each
Units
M20 Key 2NC/1NO - Yes Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 4 440K 1NO