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. 754-8293
Mfr. Part No.3SE5112-3QV10
BrandSiemens
$98.51
Each
units
M20 Key 2NC/1NO Metal 230V 230V 2NC Sirius - - 5 3SE5 1NO 37.3mm
RS Stock No. 498-911
Mfr. Part No.3SE5112-0QV10
BrandSiemens
$123.54
Each
units
M20 Key 2NC/1NO Metal 230V 230V - Sirius - - 5 3SE5 2NC/1NO 37.3mm
RS Stock No. 755-7948
Mfr. Part No.3SE5234-0QV40-1AE0
BrandSiemens
$72.96
Each
units
M20 Key 2NC Plastic 230V 230V - Sirius - - 5 3SE5 2NC 33mm
RS Stock No. 498-915
Mfr. Part No.3SE5112-1QV10
BrandSiemens
$136.09
Each
units
M20 Key 2NC/1NO Metal - 24V - Sirius - - 5 3SE5 2NC/1NO 37.3mm
RS Stock No. 754-8304
Mfr. Part No.3SE5212-0RV40
BrandSiemens
$60.70
Each
units
M20 Key 1NC/1NO Metal 230V 230V 1NC Sirius - - 5 3SE5 1NO 33mm
RS Stock No. 755-7935
Mfr. Part No.3SE5242-0QV40
BrandSiemens
$58.55
Each
units
M20 Key 2NC/1NO Plastic 230V 230V 2NC Sirius - - 5 3SE5 1NO 33mm
RS Stock No. 754-8316
Mfr. Part No.3SE5212-3RV40
BrandSiemens
$133.52
Each
units
M20 Key 1NC/1NO Metal 230V 230V 1NC Sirius - - 5 3SE5 1NO 33mm
RS Stock No. 498-927
Mfr. Part No.3SE5232-0QV40
BrandSiemens
$51.15
Each
units
M20 Key 2NC/1NO Plastic 230V 230V - Sirius - - 5 3SE5 2NC/1NO 33mm
RS Stock No. 498-921
Mfr. Part No.3SE5232-0RV40
BrandSiemens
$66.83
Each
units
M20 Key 1NC/1NO Plastic 230V 230V - Sirius - - 5 3SE5 NC/NO 33mm
RS Stock No. 754-8300
Mfr. Part No.3SE5212-0QV40
BrandSiemens
$78.14
Each
units
M20 Key 2NC/1NO Metal 230V 230V 2NC Sirius - - 5 3SE5 1NO 33mm
RS Stock No. 754-8287
Mfr. Part No.3SE5122-3QV10
BrandSiemens
$184.63
Each
units
M20 Key 2NC/1NO Metal 230V 230V 2NC Sirius - - 5 3SE5 1NO 37.8mm
RS Stock No. 754-8281
Mfr. Part No.3SE5122-1QV10
BrandSiemens
$115.99
Each
units
M20 Key 2NC/1NO Metal 230V 24V 1NC Sirius - - 5 3SE5 2NO 37.8mm
RS Stock No. 754-8284
Mfr. Part No.3SE5122-0QV10
BrandSiemens
$91.22
Each
units
M20 Key 2NC/1NO Metal 230V 230V 2NC Sirius - - 5 3SE5 1NO 37.8mm