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Kill switch
A kill switch, also known as an emergency stop or e-stop, is a safety mechanism used to shut off a device 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 ''a'') completely and as quickly as possible abort the operation, even if this damages equipment and ''b'') be operable in a manner that is quick, simple (so that even a panicking operator with impaired executive function can activate it), and, usually, ''c'') 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.
==Applications==
A similar system, usually called a dead man's switch (for other names, see alternative names), as its name suggests, is a device intended to stop a machine (or activate one) if the human operator becomes incapacitated, and is a form of fail-safe. They are commonly used in locomotives, tower cranes, freight elevators, lawn mowers, tractors, jet skis, outboard motors, snowblowers, motorcycles and snowmobiles. The switch in these cases is held by the user, and turns off the machine if they let go.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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