As discussed in Part 1, the interrupting ratings of low-voltage circuit breakers and fuses are classified on a symmetrical-current-rated basis. In this context, “symmetrical-current-rated” implies ...

A short is actually a safety measure, so when the wires get too hot, the circuit breaker trips, causing the flow of electricity to stop.

Thermal-magnetic circuit breakers contain two different switching mechanisms, a bimetal switch and an electromagnet.