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2. Substation - Wikipedia

   en.wikipedia.org/wiki/Substation

   A circuit breaker is used as a protection device to interrupt fault currents automatically, and may be used to switch loads on and off, or to cut off a line when power is flowing in the 'wrong' direction. When a large fault current flows through the circuit breaker, this is detected through the use of current transformers. The magnitude of the ...

3. Zinsco - Wikipedia

   en.wikipedia.org/wiki/Zinsco

   Zinsco would remain with copper in both their panels and breakers until the third major copper shortage in the early 1960s, when they would switch to an aluminum bus. In 1963, Zinsco introduced the R-38 twin breaker, which was the only twin circuit breaker that also made contact on both bus-bars for 240 volts in a single breaker space.

4. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   This saves a homeowner a trip to the breaker panel, should the device trip. Unlike AFCI breakers, AFCI receptacles can be used on any wiring system, regardless of the panel. [ citation needed ] When installed as the first receptacle on a branch circuit, AFCI receptacles can provide series arc protection for the entire branch circuit.

5. Selectivity (circuit breakers) - Wikipedia

   en.wikipedia.org/wiki/Selectivity_(circuit_breakers)

   Selectivity, also known as circuit breaker discrimination, is the coordination of overcurrent protection devices so that a fault in the installation is cleared by the protection device located immediately upstream of the fault. The purpose of selectivity is to minimize the impact of a failure on the network.

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