An ideal circuit breaker should offer

Question

Question

This question was previously asked in

UPPSC AE Electrical 2019 Official Paper II (Held on 13 Dec 2020)

Answer 1

A circuit breaker is a switching device that interrupts the abnormal or fault current
It is a mechanical device that disturbs the flow of high magnitude (fault) current and in additions performs the function of a switch
The circuit breaker is mainly designed for closing or opening of an electrical circuit, thus protects the electrical system from damage
When the circuit breaker is closed, it acts as short switch; Thus, before interruption ideal circuit breaker should offer zero impedance
When the circuit breaker is open, it acts as open switch; Thus, after interruption ideal circuit breaker should offer infinite impedance