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
TWD1,357.00
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
TWD2,565.00
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
TWD1,251.00
Each
units
Screw Key 2NC Plastic 240V 250V - - - - 4 D4NS - 30mm
RS Stock No. 179-4742
Mfr. Part No.HS5L-VA44LM-G
BrandIdec
TWD4,393.00
Each
units
M20 Key 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) Metal (Head) 250V 30V 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) - - Spring Lock - HS5L - 127mm
RS Stock No. 179-4743
Mfr. Part No.HS5L-VA44M-G
BrandIdec
TWD3,521.00
Each
units
M20 Key 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) Metal (Head) 250V 30V 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) - - Spring Lock - HS5L - 127mm
RS Stock No. 240-8232
Mfr. Part No.D4BS15FS
BrandOmron
TWD1,786.00
Each
units
PG 13.5 Key 1NC/1NO Plastic 400V - 1NC/1NO - - - 4 D4BS - 43mm
RS Stock No. 179-4752
Mfr. Part No.HS6E-M44B05-G
BrandIdec
TWD6,353.00
Each
units
Cable Key 1NC (Lock Monitor), 1NC/1NC (Main), 2NC (Door Monitor) - 250V 30V 1NC (Lock Monitor), 1NC+1NC (Main), 2NC (Door Monitor) - - Spring Lock - HS6E - 75mm
RS Stock No. 189-5316
Mfr. Part No.3911742392
TWD207.00
Each
units
- - - - - - - - - - - - - 15mm
RS Stock No. 179-4744
Mfr. Part No.HS5L-VA7Y4M-G
BrandIdec
TWD3,521.00
Each
units
M20 Key 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) Metal (Head) 250V 30V 1NC/1NO (Door Monitor), 1NC/1NO (Lock Monitor) - - Solenoid Lock - HS5L - 127mm
RS Stock No. 840-2823
Mfr. Part No.SI-QS90MFF
BrandBanner
TWD6,235.00
Each
units
M20 Key 2NC/1NO Glass Fibre Reinforced PA 230V 24V - - Yes - 2 SI-QS90 - 33mm
RS Stock No. 181-1208
Mfr. Part No.LS-S02-24DFT-ZBZ/X
BrandEaton
TWD9,384.00
Each
units
Screw - 2NC Insulated Material 415V 220V 2NC - Yes Spring Lock 1 LS ZBZ/X - 30.8mm
RS Stock No. 189-5317
Mfr. Part No.6051101003
TWD345.00
Each
units
- - - Glass Fibre Reinforced Thermoplastic - - - - - - - - - 25.4mm
RS Stock No. 766-1618
Mfr. Part No.XCSB722
TWD6,026.00
Each
units
- Key 2NC/1NO Zamak 240V 250V 2NC/1NO Preventa Yes - 8 XCSB - 44mm
RS Stock No. 185-7258
Mfr. Part No.M-TS (D401)
BrandIDEM
TWD7,075.00
Each
units
M6 Screw Key - Die Cast Metal, Stainless Steel - - - - - Interlock 2 M-TS - 109mm
RS Stock No. 820-3507
Mfr. Part No.GKMB33
BrandHoneywell
TWD2,315.00
Each
units
Cable Key 1NC/1NO Glass Filled PET 240V 250V - - Yes - 2 GKM - 16mm
RS Stock No. 181-1210
Mfr. Part No.LS-S02-230AFT-ZBZ/X
BrandEaton
TWD9,384.00
Each
units
Screw - 2NC Insulated Material 415V 220V 2NC - Yes Spring Lock 1 LS ZBZ/X - 30.8mm
RS Stock No. 147-556
Mfr. Part No.GKMB16
BrandHoneywell
TWD2,197.00
Each
units
Cable Key 2NC Glass Filled PET 50V 50V 2NC - - - 2 GKM - 16mm
RS Stock No. 133-0062
Mfr. Part No.XCSMP70L5
TWD2,878.00
Each
units
Cable Key 2NC/1NO Polyamide 240V 250V 2NC/1NO Preventa Yes - 1 XCSMP - 87mm
RS Stock No. 185-7249
Mfr. Part No.M-TD-11 (A101, B202)
BrandIDEM
TWD13,780.00
Each
units
M6 Screw Key - Die Cast Metal, Stainless Steel - - - - - Interlock 2 M-TD - 109mm
RS Stock No. 498-921
Mfr. Part No.3SE5232-0RV40
BrandSiemens
TWD1,350.00
Each
units
M20 Key 1NC/1NO Plastic 230V 230V - Sirius - - 5 3SE5 NC/NO 33mm