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
TWD1,291.00
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
TWD2,449.00
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
TWD1,191.00
Each
units
Screw Key 2NC Plastic 240V 250V - - - - 4 D4NS - 30mm
RS Stock No. 179-4724
Mfr. Part No.HS1L-R44KMSRM-G
BrandIdec
TWD10,151.00
Each
units
M20 Key 1NC/1NC (Main), 1NO/1NC (Door Monitor), 2NC (Lock Monitor) - 250V 30V 1NC+1NC (Main), 1NO/1NC (Door Monitor), 2NC (Lock Monitor) - - Spring Lock - HS1L - 129mm
RS Stock No. 498-927
Mfr. Part No.3SE5232-0QV40
BrandSiemens
TWD1,345.00
Each
units
M20 Key 2NC/1NO Plastic 230V 230V - Sirius - - 5 3SE5 2NC/1NO 33mm
RS Stock No. 301-9956
Mfr. Part No.XCSTA592
TWD1,540.00
Each
units
Screw Key 1NC/2NO Glass Fibre Reinforced PA 240V 250V 1NC/2NO Preventa - - 8 XCSTA - 30mm
RS Stock No. 179-4725
Mfr. Part No.HS1L-R44KMSRM-R
BrandIdec
TWD10,151.00
Each
units
M20 Key 1NC/1NC (Main), 1NO/1NC (Door Monitor), 2NC (Lock Monitor) - 250V 30V 1NC+1NC (Main), 1NO/1NC (Door Monitor), 2NC (Lock Monitor) - - Spring Lock - HS1L - 129mm
RS Stock No. 755-7948
Mfr. Part No.3SE5234-0QV40-1AE0
BrandSiemens
TWD1,956.00
Each
units
M20 Key 2NC Plastic 230V 230V - Sirius - - 5 3SE5 2NC 33mm
RS Stock No. 623-3098
Mfr. Part No.AZ 17-11ZK
BrandSchmersal
TWD899.00
Each
units
M16 Key 1NC/1NO Glass Fibre Reinforced Thermoplastic 230V 24V 1NC - - - 4 AZ17 1NO 30mm
RS Stock No. 744-8660
Mfr. Part No.570220
BrandPilz
TWD1,485.00
Each
units
Screw Key 2NC Glass Fibre Reinforced Thermoplastic 240V - 2NC PSENmech Yes - 4 - - 33mm
RS Stock No. 179-4726
Mfr. Part No.HS5D-03RN
BrandIdec
TWD1,585.00
Each
units
G1/2 Handle 3NC Plastic (Head) 250V 30V 3NC - - Interlock - HS5D - 91mm
RS Stock No. 623-3048
Mfr. Part No.AZ16-02ZVRK-M20-2254
BrandSchmersal
TWD1,090.00
Each
units
M20 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 3 AZ16 - 30mm
RS Stock No. 179-4736
Mfr. Part No.HS5D-12ZRN
BrandIdec
TWD1,786.00
Each
units
G1/2 Handle 1NO/2NC Metal (Head) 250V 30V 1NO+2NC - - Interlock - HS5D - 91mm
RS Stock No. 754-8300
Mfr. Part No.3SE5212-0QV40
BrandSiemens
TWD1,612.00
Each
units
M20 Key 2NC/1NO Metal 230V 230V 2NC Sirius - - 5 3SE5 1NO 33mm
RS Stock No. 623-3105
Mfr. Part No.AZ 17-02ZK
BrandSchmersal
TWD926.00
Each
units
M16 Key 2NC Glass Fibre Reinforced Thermoplastic 230V 24V 2NC - - - 4 AZ17 - 30mm
RS Stock No. 133-0086
Mfr. Part No.XCSA803
TWD3,247.00
Each
units
1/2 in NPT Key 3NC Zamak 240V 250V 3NC Preventa Yes - 8 XCSA - 114mm
RS Stock No. 700-4298
Mfr. Part No.XCSA703
TWD3,263.00
Each
units
Screw Clamp Key NO/2NC Zamak 240V 250V NO/2NC Preventa - - 4 XCSA - 44mm
RS Stock No. 263-3696
Mfr. Part No.XCSC702
TWD4,870.00
Each
units
Screw Key 2NC/1NO Zamak 240V 250V 2NC/1NO Preventa - - 8 XCSC - 44mm
RS Stock No. 744-8664
Mfr. Part No.570222
BrandPilz
TWD1,897.00
Each
units
Screw Key 2NC Glass Fibre Reinforced Thermoplastic 240V - 2NC PSENmech Yes - 4 - - 33mm
RS Stock No. 179-4727
Mfr. Part No.HS5D-03RNM
BrandIdec
TWD1,585.00
Each
units
M20 Handle 3NC Plastic (Head) 250V 30V 3NC - - Interlock - HS5D - 91mm