MCBs are commonly used in domestic wiring circuits because they function as both a switch to control the power flow and a protective device that trips when the current exceeds a safe limit, safeguarding against overloads and 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 ________.
