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Receptacle tester. A receptacle tester or outlet tester is a device used to verify that an AC wall outlet is wired properly. The tester itself is small device containing a power plug and several indicator lights.
All circuit breakers are overcurrent protection devices, which are used to disconnect a circuit in the event of a prolonged overload current or a short-circuit current. An aiâ¦r circuit breaker is one of many types of high-voltage circuit breaker. It uses a blast of compressed air to extinguish the arc formed when its main contacts open. In some cases, air pressure is also used to operate the mechanism that opens and closes the main contacts. 4 people found this useful.