guarding a motor, and the safety switch fails, the motor should not be able to run.

2-7-3 Safety Device Lock-Outs

Some safety devices disconnect electrical energy from a circuit. The safety devices that are used in the SSC1-5Q Controller are primarily concerned with electrical power disconnection.

WARNING! Always disconnect and lockout all electrical power and pneumatic (i.e. compressed air) sources prior to servicing the SSC1-5Q Controller. Failure to do so may result in serious injury. No one but the person who installed the lockout may remove it.

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Sterling SSC1-5Q service manual Safety Device Lock-Outs