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. 623-3054
Mfr. Part No.AZ16-12ZVRK-M20
BrandSchmersal
$106.49
Each
units
M20 Key 2NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 AZ16 1NO
RS Stock No. 623-2988
Mfr. Part No.AZ16ZVRK-M20
BrandSchmersal
$76.58
Each
units
M20 Key 1NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ16 1NO
RS Stock No. 252-3864
Mfr. Part No.XCSPA591
$140.71
Each
units
- Key 1NC/1NO - - Polyamide 240V - 250V Preventa IP67 8 XCSPA -
RS Stock No. 549-619
Mfr. Part No.D4NS-4CF
BrandOmron
$189.37
Each
units
M20 Key 2NC/1NO - - Plastic 240V 2NC/1NO 250V - IP67 4 D4NS -
RS Stock No. 623-2972
Mfr. Part No.AZ15ZVRK-M20-2254
BrandSchmersal
$73.98
Each
units
M20 Key 1NC - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ15 -
RS Stock No. 625-0374
Mfr. Part No.AZ15ZVRK-M20
BrandSchmersal
$70.94
Each
units
M20 Key 1NC - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ15 -
RS Stock No. 625-0330
Mfr. Part No.AZ16-02ZVRK-M20
BrandSchmersal
$63.84
Each
units
M20 Key 2NC - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 AZ16 -
RS Stock No. 397-2166
Mfr. Part No.XCSA801
$306.32
Each
units
Screw Key 3NC - - Zamak 240V 3NC 250V Preventa IP67 8 XCSA -
RS Stock No. 549-558
Mfr. Part No.D4NS-8CF
BrandOmron
$143.52
Each
units
M20 Key 2NC/1NO - - Plastic 240V 2NC/1NO 250V - IP67 4 D4NS -
RS Stock No. 623-3004
Mfr. Part No.AZ16ZVRK-M20-2254
BrandSchmersal
$59.49
Each
units
M20 Key 1NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 1NC 24V - IP67 3 AZ16 1NO
RS Stock No. 263-3595
Mfr. Part No.XCSA502
$436.62
Each
units
Screw Key 1NC/2NO - - Zamak 240V 1NC/2NO 250V Preventa IP67 8 XCSA -
RS Stock No. 263-3624
Mfr. Part No.XCSA702
$584.40
Each
units
Screw Key 2NC/1NO - - Zamak 240V 2NC/1NO 250V Preventa IP67 8 XCSA -
RS Stock No. 826-3912
Mfr. Part No.203001
BrandIDEM
$81.61
Each
units
M20 Key 2NC/1NO - - Die Cast Metal 240V 2NC - Kobra IP67 4 KM 1NO
RS Stock No. 826-3928
Mfr. Part No.200001-SS
BrandIDEM
$75.54
Each
units
M20 Key 2NC/1NO - - Polyester 240V 2NC - Kobra IP67 4 KP 1NO
RS Stock No. 826-3915
Mfr. Part No.203007F
BrandIDEM
$103.28
Each
units
M20 Key 3NC/1NO - Yes Die Cast Metal 240V 3NC - Kobra IP67 4 KM 1NO
RS Stock No. 623-3076
Mfr. Part No.AZ16-12ZVRK-M20-2254
BrandSchmersal
$98.52
Each
units
M20 Key 2NC/1NO - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 3 AZ16 1NO
RS Stock No. 623-3105
Mfr. Part No.AZ 17-02ZK
BrandSchmersal
$74.05
Each
units
M16 Key 2NC - - Glass Fibre Reinforced Thermoplastic 230V 2NC 24V - IP67 4 AZ17 -
RS Stock No. 240-8232
Mfr. Part No.D4BS15FS
BrandOmron
$135.95
Each
units
PG 13.5 Key 1NC/1NO - - Plastic 400V 1NC/1NO - - IP67 4 D4BS -
RS Stock No. 305-1966
Mfr. Part No.XCSPA791
$129.31
Each
units
Screw Key 2NC - - Glass Fibre Reinforced PA 240V - 250V Preventa IP67 8 XCSPA -
RS Stock No. 826-3919
Mfr. Part No.200001
BrandIDEM
$56.00
Each
units
M20 Key 2NC/1NO - - Polyester 240V 2NC - Kobra IP67 4 KP 1NO