One of the most commonly used low-voltage air circuit breakers is the molded case circuit breaker

Low-voltage circuit breaker is one which is suited for circuits rated at ___ volts or lower

Which of the following is used for arc interruption and containing the arc in Circuit Breakers:

In Oil Circuit Breakers arc is extinguished with the help of Oil

Which of the following Circuit Breaker requires least maintenance:

Circuit Breaker can do which of the following operation:

Which one of the material is not used as arcing contact material in Circuit Breakers:

After the Trip the Circuit Breaker is reset by moving the handle to “OFF” position and later to “ON” position:

Contact opening speed in CB is independent of how fast the handle is operated from ON Position to OFF position

In the Circuit Breaker which of the following component determines when the contacts will open automatically:

In case of Thermal-magnetic circuit breakers which of following device is used to sense overloads:

in case of Thermal-magnetic circuit breaker, when short circuit occurs  ________ trips the circuit breaker