28th November 2019

wikipedia
17

What is the over current?

Possible causes for overcurrent include short circuits, excessive load, incorrect design, or a ground fault. Fuses, circuit breakers, temperature sensors and current limiters are commonly used protection mechanisms to control the risks of overcurrent.

Then, what is an overcurrent device?

A circuit breaker is defined by the National Electrical Code (NEC) 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.”

What is the purpose of an overcurrent protection device?

Overcurrent protective devices protect the circuit conductors in two ways. They protect the conductors from overload conditions and from short-circuit or ground-fault conditions. If you put too much of a load on the circuit, the overcurrent device will open.
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