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. 330-0729
Mfr. Part No.440K-T11131
£65.37
Each
Units
M20 Key 2NC/1NO Interlock - Glass Filled PBT 500V 2NC 250V Trojan 5 IP67 4 440K 1NO
RS Stock No. 666-4947
Mfr. Part No.XCSA702EX
£194.00
Each
Units
Screw Key 2NC/1NO - - Zamak 240V 2NC/1NO 250V Preventa IP67 8 XCSA -
RS Stock No. 873-2200
Mfr. Part No.440K-T11110
£42.20
Each
Units
M20 Key 2NC/1NO - Yes Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 8 440K 1NO
RS Stock No. 410-7212
Mfr. Part No.SKT-U1Z M3
£23.35
Each
Units
Screw Key 1NC/1NO - Yes Glass Fibre Reinforced Thermoplastic 240V 1NC/1NO 250V - IP65 4 SKT -
RS Stock No. 698-8729
Mfr. Part No.EX-AZ 16-03ZVRK-3D
BrandSchmersal
£56.35
Each
Units
Screw Key 3NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 3NC 24V - IP67 3 EX-AZ16 1NO
RS Stock No. 623-3082
Mfr. Part No.AZ 17-11ZRK
BrandSchmersal
£27.50
Each
Units
M16 Key 1NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 4 AZ17 1NO
RS Stock No. 609-6697
Mfr. Part No.XCSA711
£89.30
Each
Units
Screw Key 2NC/1NO - - Zamak 240V 2NC/1NO 250V Preventa IP67 8 XCSA -
RS Stock No. 873-2247
Mfr. Part No.440K-C21067
£56.43
Each
Units
M12 Key 2NC/1NO - Yes Glass Filled PBT 600V 2NC 24V Cadet 3 IP67 8 440K 1NO
RS Stock No. 263-3595
Mfr. Part No.XCSA502
£72.20
Each
Units
Screw Key 1NC/2NO - - Zamak 240V 1NC/2NO 250V Preventa IP67 8 XCSA -
RS Stock No. 744-8673
Mfr. Part No.570230
BrandPilz
£28.49
Each
Units
Screw Key 1NC/1NO - Yes Glass Fibre Reinforced Thermoplastic 240V 2NC/1NO - PSENmech IP65 4 - -
RS Stock No. 826-3877
Mfr. Part No.222003
BrandIDEM
£25.17
Each
Units
M16 Key 1NC/1NO - - Glass Fibre Polyester - 1NC/1NO - Kobra IP67 8 INCH-1 -
RS Stock No. 394-7485
Mfr. Part No.440T-MDALE100A0B
£366.63
Each
Units
- Trapped Key - Interlock - Stainless Steel - - - Prosafe - 1 440T -
RS Stock No. 826-3892
Mfr. Part No.204026
BrandIDEM
£246.38
Each
Units
Cable Key 2NC/2NO - - Stainless Steel 250V 2NC/1NO 250V Kobra IP67 8 KM-SS-Ex 1NO
RS Stock No. 609-6754
Mfr. Part No.XCSPA691
£38.00
Each
Units
Screw Key 1NC/1NO - - Glass Fibre Reinforced PA 240V 1NC/1NO 250V Preventa IP67 8 XCSPA -
RS Stock No. 826-3909
Mfr. Part No.204001
BrandIDEM
£87.62
Each
Units
M20 Key 2NC/1NO - - Stainless Steel - 2NC/1NO - Kobra IP67 8 KM-SS -
RS Stock No. 284-0771
Mfr. Part No.XCSTA792
£36.10
Each
Units
Screw Key 2NC/1NO - - Glass Fibre Reinforced PA 240V 2NC/1NO 250V Preventa IP67 8 XCSTA -
RS Stock No. 751-0939
Mfr. Part No.440K-T11468
£44.06
Each
Units
M20 Key 2NC/1NO Interlock Yes Glass Filled PBT 240V 2NC 24V Trojan 5 IP67 4 440K 1NO
RS Stock No. 394-7463
Mfr. Part No.440T-MSALE100B
£174.58
Each
Units
M5 Key - Interlock Yes Stainless Steel - - - Prosafe - 1 440T -
RS Stock No. 458-5987
Mfr. Part No.440T-MSSLE100A
£320.00
Each
Units
M5 Key - - Yes Stainless Steel - - - Prosafe - 1 440T -
RS Stock No. 198-734
Mfr. Part No.XCSTA891
£39.00
Each
Units
Screw Key 3NC - - Glass Fibre Reinforced PA 240V 3NC 250V Preventa IP67 8 XCSTA -