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A kill switch, also known as an emergency stop (e-stop) or emergency power off (EPO), is a safety mechanism used to shut off a device or machinery in an emergency situation in which it cannot be shut down in the usual manner. Unlike a normal shut-down switch/procedure, which shuts down all systems in an orderly fashion and turns the machine off without damaging it, a kill switch is designed and configured to completely and as quickly as possible abort the operation (even if this damages equipment) and be operable in a manner that is quick and simple (so that even a panicking operator with impaired executive function or a bystander can activate it). Kill switches are usually designed so as to be obvious even to an untrained operator or a bystander.
Many kill switches feature a removable barrier or other protection against accidental activation (e.g., a plastic cover that must be lifted or glass that must be broken). Such a removable barrier is commonly called a Mollyguard. Kill switches are featured especially often as part of mechanisms whose normal operation or foreseeable misuse may cause injury or death; designers who include such switches consider damage to or destruction of the mechanism to be an acceptable cost of preventing that injury or death.
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