(a.k.a. selector switch, safety switch, interlock switch, safety interlock, enabling switch, grip switch)
The basics: interlocks prevent the user from doing something unsafe, or at least minimize the hazard of something unsafe, by putting the machine in a safe condition when the unsafe action happens. Safety interlocks generally have additional features to reduce these hazards even further and monitor the position of a guard or gate. Interlocks can be an electromechanical switch, such as a limit or magnetic switch. Enabling (grip) switches are actuated by squeezing the trigger and are generally used to allow a safe environment inside a machine. They will cause a stop condition unless they are 'enabled'.
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