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 Housing Material Maximum AC Voltage Maximum DC Voltage Safety Contacts Range Actuator Included Lock Type Number of Head Directions Series Auxiliary Contacts Depth
RS Stock No. 549-552
Mfr. Part No.D4NS-4DF
BrandOmron
$99.52
Each
units
M20 Key 3NC Plastic 240V 250V 3NC - - - 4 D4NS - 30mm
RS Stock No. 623-3082
Mfr. Part No.AZ 17-11ZRK
BrandSchmersal
$80.70
Each
units
M16 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 4 AZ17 1NO 30mm
RS Stock No. 623-3098
Mfr. Part No.AZ 17-11ZK
BrandSchmersal
$83.02
Each
units
M16 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 4 AZ17 1NO 30mm
RS Stock No. 305-1966
Mfr. Part No.XCSPA791
$131.25
Each
units
Screw Key 2NC Glass Fibre Reinforced PA 240V 250V - Preventa - - 8 XCSPA - 30mm
RS Stock No. 296-4669
Mfr. Part No.XCSPA592
$152.27
Each
units
Screw Key 1NC/1NO Glass Fibre Reinforced PA 240V 250V 1NC/1NO Preventa - - 8 XCSPA - 30mm
RS Stock No. 744-8673
Mfr. Part No.570230
BrandPilz
$95.33
Each
units
Screw Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 240V - 2NC/1NO PSENmech Yes - 4 - - 33mm
RS Stock No. 623-3054
Mfr. Part No.AZ16-12ZVRK-M20
BrandSchmersal
$112.03
Each
units
M20 Key 2NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 1NO 30mm
RS Stock No. 296-4675
Mfr. Part No.XCSPA792
$196.83
Each
units
Screw Key 2NC Glass Fibre Reinforced PA 240V 250V 2NC Preventa - - 8 XCSPA - 30mm
RS Stock No. 623-2988
Mfr. Part No.AZ16ZVRK-M20
BrandSchmersal
$77.43
Each
units
M20 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 3 AZ16 1NO 30mm
RS Stock No. 826-3919
Mfr. Part No.200001
BrandIDEM
$58.29
Each
units
M20 Key 2NC/1NO Polyester 240V - 2NC Kobra - - 4 KP 1NO 34.5mm
RS Stock No. 284-0771
Mfr. Part No.XCSTA792
$150.05
Each
units
Screw Key 2NC/1NO Glass Fibre Reinforced PA 240V 250V 2NC/1NO Preventa - - 8 XCSTA - 30mm
RS Stock No. 744-8660
Mfr. Part No.570220
BrandPilz
$90.27
Each
units
Screw Key 2NC Glass Fibre Reinforced Thermoplastic 240V - 2NC PSENmech Yes - 4 - - 33mm
RS Stock No. 826-3899
Mfr. Part No.204019
BrandIDEM
$475.99
Each
units
Cable Key 2NC Stainless Steel 250V 250V 2NC Kobra - - 8 KM-SS-Ex - 44mm
RS Stock No. 410-7206
Mfr. Part No.SKI-U1Z M3
$81.27
Each
units
Screw Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 240V - 1NC/1NO - Yes - 4 SKI - 30.5mm
RS Stock No. 549-619
Mfr. Part No.D4NS-4CF
BrandOmron
$108.47
Each
units
M20 Key 2NC/1NO Plastic 240V 250V 2NC/1NO - - - 4 D4NS - 30mm
RS Stock No. 826-3915
Mfr. Part No.203007F
BrandIDEM
$101.70
Each
units
M20 Key 3NC/1NO Die Cast Metal 240V - 3NC Kobra Yes - 4 KM 1NO 43.5mm
RS Stock No. 755-7935
Mfr. Part No.3SE5242-0QV40
BrandSiemens
$80.85
Each
units
M20 Key 2NC/1NO Plastic 230V 230V 2NC Sirius - - 5 3SE5 1NO 33mm
RS Stock No. 623-3060
Mfr. Part No.AZ16-03ZVRK-M20
BrandSchmersal
$81.39
Each
units
M20 Key 3NC Glass Fibre Reinforced Thermoplastic 230V 24V 3NC - - - 3 AZ16 - 30mm
RS Stock No. 780-5489
Mfr. Part No.HS5D-02RNM
BrandIdec
$73.87
Each
units
M20 Key 2NC Plastic 250V 250V - - - - 8 HS5D - 30mm
RS Stock No. 826-3896
Mfr. Part No.208001
BrandIDEM
$197.56
Each
units
M20 Key 2NC/1NO Stainless Steel 240V - 2NC Kobra - - 4 K-SS 1NO 37.5mm
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