88.What is the function of Circuit Breakers and what are the types and their applications?

A device used to close/Open a electrical equipment to the power supply is called

Circuit Breaker.

They are named by the cooling or arc quenching media used in the device. When an equipment is disconnected from a power supply, the potential strength will be more. This will produce heat in between the surfaces and cause the media to ionize. This is spark. If the spark continues  and it will be called as Arc. The heat energy will damage the device.

To reduce the effect of heat generation, the area provided to the breaker  will be increased. The time to separate the equipment from power supply will be minimized by using spring. However the arc can be controlled by cooling or using media which can withstand high potential strength.

       Air, Oil and SF6 gas are some of the quenching media used in a circuit breaker. The breaker is named based on them.            They are Air Circuit Breaker (ACB), Oil Circuit Breaker (OCB) and SF6 Circuit Breaker