Difference between Circuit Breaker and Isolator

Nov 30 -0001

Distinguish, differentiate, compare and explain what is the difference between Circuit Breaker and Isolator. Comparison and Differences.

Differences between Circuit Breaker and Isolator

S.No.	Basis of difference	Circuit Breaker	Isolator
1	Type of Device	Circuit Breaker is an On-load device, meaning it can operate when the supply is on and also when the supply is off.	Isolator also known as disconnector is an Off-load device, meaninig it can opearte only when the device is off.
2	Operation	It is operated automatically.	It is operated manually.
3	Action of device	It is an electronic device made by using MOSFET or BJT.	It is a mechanical device which acts as a switch.
4	Arc Requirement	The current is interrupted and hence heavy arc is produced. Arc quenching facility is provided.	No arcing during On-Off so no arc quenching provision.
5	Function	The circuit breaker is a device such as MCB or ACB which trips the entire system when there is any fault. It is often mounted to a PCB assembly for protection.	Isolator only cuts a portion of a substation when a fault occures. So, the other devices can operate without any interruption.
6	Withstand Capability	Has a high withstand capability at the onload condition.	Has low withstand capability.
7	Noise Factor	Create a large sound when operate.	Noise less working.
8	Cost	Costly.	Cheaper.