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 Hazardous Area Certification Number of Head Directions Series
RS Stock No. 240-8232
Mfr. Part No.D4BS15FS
BrandOmron
£56.15
Each
Units
PG 13.5 Key 1NC/1NO - - Plastic 400V 1NC/1NO - - IP67 - 4 D4BS
RS Stock No. 746-7292
Mfr. Part No.D4NS-4AF
BrandOmron
£26.92
Each
Units
Screw Key 1NC/1NO - - Plastic - - - - - - 4 D4NS
RS Stock No. 549-619
Mfr. Part No.D4NS-4CF
BrandOmron
£27.54
Each
Units
M20 Key 2NC/1NO - - Plastic 240V 2NC/1NO 250V - IP67 - 4 D4NS
RS Stock No. 861-4641
Mfr. Part No.D4GS-N2T
BrandOmron
£54.96
Each
Units
Cable Key 2NC - - Plastic 240V 1NC 250V - IP67 - 2 D4GS
RS Stock No. 746-7295
Mfr. Part No.D4NS-4BF
BrandOmron
£27.07
Each
Units
Screw Key 2NC - - Plastic - - - - - - 4 D4NS
RS Stock No. 549-552
Mfr. Part No.D4NS-4DF
BrandOmron
£27.54
Each
Units
M20 Key 3NC - - Plastic 240V 3NC 250V - IP67 - 4 D4NS
RS Stock No. 861-4650
Mfr. Part No.D4NS-2CF
BrandOmron
£29.73
Each
Units
G1/2 Key 2NC/1NO - Yes Plastic 240V - 250V - IP67 - 4 D4NS
RS Stock No. 549-558
Mfr. Part No.D4NS-8CF
BrandOmron
£27.54
Each
Units
M20 Key 2NC/1NO - - Plastic 240V 2NC/1NO 250V - IP67 - 4 D4NS
RS Stock No. 836-2766
Mfr. Part No.D4NS1FF
BrandOmron
£27.54
Each
Units
PG 13.5 Key 2NC/1NO - No Plastic 240V - 250V - IP67 - 4 D4NS
RS Stock No. 549-502
Mfr. Part No.D4NS-9BF
BrandOmron
£41.62
Each
Units
M12 Key 2NC - - Plastic 240V 2NC 250V - IP67 - 4 D4NS
RS Stock No. 861-4644
Mfr. Part No.D4GS-N4R
BrandOmron
£60.35
Each
Units
Cable Key 3NC - - Plastic 240V 2NC 250V - IP67 - 2 D4GS
RS Stock No. 841-1688
Mfr. Part No.D4GSN1R5
BrandOmron
£82.20
Each
Units
Cable Key 1NC/1NO - - Plastic 240V 1NC 250V - IP67 - 1 D4GS