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With a surge protector. The surge protector opens the circuit if a surge is detected. The third "pin" is connected to a ground wire to protect the circuit from a short and to dissipate "stray" charges. Overload breakers protect users and equipment from overloads , usually caused by shorts, by heating up and opening the circuit.(same as a surge protector.)

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Q: How are appliances protected from power surges in three-pin plugs?
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