Interlock Switches

In an electric circuit, interlock switches interrupt the current or divert the current from one conductor to another. Interlock switches are a form of safety device on machinery and industrial equipment that needs a guarding mechanism. When the guard opens, the switch trips and opens the circuit and disrupts the current flow of the circuit. The machinery shuts down if the circuit is interrupted.

What are interlock switches used for?

An interlock switch is primarily a safety measure. A guard may be interlocked to prevent machine operation when the guard is removed. A control may be interlocked to make it nonoperational if a hazardous condition will result.

Manufacturing and industrial environments use interlock switches in machinery of all types. Interlock switches are also used in the domestic environment, in devices such as automated gates or slam-lock doors.

Types of interlock switches

Interlock switches can be simple electromechanical switches like magnetic or limit switches. They also come in complex varieties with sophisticated interlocking mechanisms in the form of sensors and actuators. Examples of modern interlocking switches are multipole magnetic switches and uniquely shaped key switches.


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Description Price Lock Style Connection Type Number of Head Directions Normal State Configuration Maximum Current Maximum AC Voltage Actuator Included Auxiliary Contacts Safety Contacts Housing Material IP Rating Length Width Depth
RS Stock No. 2550071004
Mfr. Part No.44531-0150
HK$1,272.18
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RS Stock No. 2550070988
Mfr. Part No.44530-0010
HK$3,261.16
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