Circuit Breakers
Circuit Breakers are reusable overcurrent protection devices.
After tripping to break the circuit, the
breaker can be reset to protect the circuit again.
There are two accepted definitions for circuit breakers.
The National Electrical...
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Circuit Breakers
Circuit Breakers are reusable overcurrent protection devices.
After tripping to break the circuit, the
breaker can be reset to protect the circuit again.
There are two accepted definitions for circuit breakers.
The National Electrical Manufacturers Association (NEMA) defines a circuit breaker as a device designed
to open and close a circuit, by non-automatic means, and to open the circuit automatically on a
predetermined overcurrent without injury to itself when properly applied within its rating.
The
American National Standards Institute (ANSI) states that a circuit breaker is a mechanical switching
device capable of making, carrying and breaking currents under normal circuit conditions.
Also, it is
capable of making and carrying a current for a specified time, and breaking currents under specified
abnormal circuit conditions such as those of a short circuit.
All circuit breakers have the following
common design and functional characteristics:
Frame
The circuit
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