An Air Circuit Breaker or ACB is an electrical device that protects circuits from excessive current. They are automatic switches that safely interrupt high currents under unusual conditions. This may include overload or short circuits.
What is the advantage of using the current grading in relay systems?
An overcurrent relay having a current setting of 125% is connected to a supply circuit through a current transformer of ratio 400/10. The pick-up value will be:
The pick-up value of a relay is 7.5 A and the fault current in the relay coil is 30 A. Its plug-setting multiplier is ________.
