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. 252-3864
Mfr. Part No.XCSPA591
TWD1,330.00
Each
units
- Key 1NC/1NO Polyamide 240V 250V - Preventa - - 8 XCSPA - 30mm
RS Stock No. 362-2782
Mfr. Part No.AZ16-12ZI-B1-M20
BrandSchmersal
TWD2,530.00
Each
units
M20 Key 2NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - Yes - 3 AZ16 1NO 30mm
RS Stock No. 757-9231
Mfr. Part No.D4NS-1BF
BrandOmron
TWD1,226.00
Each
units
Screw Key 2NC Plastic 240V 250V - - - - 4 D4NS - 30mm
RS Stock No. 147-506
Mfr. Part No.GKMB39
BrandHoneywell
TWD2,736.00
Each
units
Cable Key 1NC/1NO Glass Filled PET 50V 50V 1NC/1NO - - - 2 GKM - 16mm
RS Stock No. 147-512
Mfr. Part No.GKMB13
BrandHoneywell
TWD2,564.00
Each
units
Cable Key 1NC/1NO Glass Filled PET 50V 50V 1NC/1NO - - - 2 GKM - 16mm
RS Stock No. 826-3896
Mfr. Part No.208001
BrandIDEM
TWD3,486.00
Each
units
M20 Key 2NC/1NO Stainless Steel 240V - 2NC Kobra - - 4 K-SS 1NO 37.5mm
RS Stock No. 252-3763
Mfr. Part No.XCSA511
TWD9,852.00
Each
units
Screw Key 1NC/2NO Zamak 240V 250V 1NC/2NO Preventa - - 8 XCSA - 44mm
RS Stock No. 263-3696
Mfr. Part No.XCSC702
TWD4,868.00
Each
units
Screw Key 2NC/1NO Zamak 240V 250V 2NC/1NO Preventa - - 8 XCSC - 44mm
RS Stock No. 826-3899
Mfr. Part No.204019
BrandIDEM
TWD9,187.00
Each
units
Cable Key 2NC Stainless Steel 250V 250V 2NC Kobra - - 8 KM-SS-Ex - 44mm
RS Stock No. 189-5309
Mfr. Part No.6018200002
TWD4,906.00
Each
units
Screw - NC/NO (Guard Lock), NC/NO (Inter Lock) Glass Fibre Reinforced Thermoplastic 24V 24V NC/NO (Guard Lock), NC/NO (Inter Lock) - Yes Guard Lock, Inter Lock - SLC - 44mm
RS Stock No. 549-619
Mfr. Part No.D4NS-4CF
BrandOmron
TWD1,105.00
Each
units
M20 Key 2NC/1NO Plastic 240V 250V 2NC/1NO - - - 4 D4NS - 30mm
RS Stock No. 252-3779
Mfr. Part No.XCSC501
TWD4,285.00
Each
units
Screw Key 1NC/2NO Zamak 240V 250V 1NC/2NO Preventa - - 8 XCSC - 44mm
RS Stock No. 179-4727
Mfr. Part No.HS5D-03RNM
BrandIdec
TWD889.00
Each
units
M20 Handle 3NC Plastic (Head) 250V 30V 3NC - - Interlock - HS5D - 91mm
RS Stock No. 179-4723
Mfr. Part No.HS1L-DT44KMSR-R
BrandIdec
TWD5,994.00
Each
units
G1/2 Key 1NC (Door Monitor), 1NC (Lock Monitor), 1NC/1NC (Main) - 250V 30V 1NC (Door Monitor), 1NC (Lock Monitor), 1NC+1NC/1NC+1NC (Main) - - Spring Lock - HS1L - 129mm
RS Stock No. 185-7262
Mfr. Part No.M-BS (A101)
BrandIDEM
TWD5,707.00
Each
units
M6 Screw Key - Die Cast Metal, Stainless Steel - - - - Yes Interlock - M-BS - 109mm
RS Stock No. 820-3500
Mfr. Part No.GKMA33
BrandHoneywell
TWD2,876.00
Each
units
Cable Key 1NC/1NO Glass Filled PET 240V 250V - - Yes - 2 GKM - 16mm
RS Stock No. 179-4721
Mfr. Part No.HS1L-DQ44KMSR-R
BrandIdec
TWD5,994.00
Each
units
G1/2 Key 1NC/1NC (Main), 1NO (Door Monitor), 1NO (Lock Monitor) - 250V 30V 1NC+1NC/1NC+1NC (Main), 1NO (Door Monitor), 1NO (Lock Monitor) - - Spring Lock - HS1L - 129mm
RS Stock No. 179-4749
Mfr. Part No.HS6B-12B05
BrandIdec
TWD1,727.00
Each
units
Cable - 2NC/1NO - 250V 30V 2NC+1NO - - Interlock - HS6B - 87mm
RS Stock No. 623-3105
Mfr. Part No.AZ 17-02ZK
BrandSchmersal
TWD973.00
Each
units
M16 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 4 AZ17 - 30mm
RS Stock No. 623-2972
Mfr. Part No.AZ15ZVRK-M20-2254
BrandSchmersal
TWD1,061.00
Each
units
M20 Key 1NC Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 3 AZ15 - 75mm