What is Difference Between Isolator and Circuit Breaker?


What is Isolator?

Isolator or disconnectors, as the name indicates, is a switching or isolation device, intended to disconnect equipment or electrical Circuit from the supply. It is an offload device, which means it can be operated only when the current passing through it is zero.

What is Circuit Breaker?

A Circuit Breaker is a protective device used to control the flow of current same like a fuse. It break the circuit in case of fault conditions like short circuit and overload. It also capable to operate automatically, manually or by remote control in normal and faulty conditions. A relay inside the circuit breaker sense the errors signal and sends to the mechanical switch which make and close the contacts.

Difference Between Isolator and Circuit Breaker



Isolator is meant only for interrupting the power during maintenance or repair.

Circuit breakers are meant for protection of a circuit or equipment from short circuit and overload faults while they are in operation.

Isolators and Disconnectors are types of simple mechanical switch.

Circuit Breaker consists of electromechanical switch and a relay in a single box.

Atmospheric Air is used as arc quenching medium

Different kind of medium are used typically atmospheric air, SF6 and Vacuum

It is a Mechanical device which acts as a switch.

It is an Electronic device made by using MOSFET or BJT.

Isolators can be operated only during offload

Circuit breakers can be operated during both on-load and offload.

Pantograph ,Knee, Double Break, Center Break, Earthing etc.

MCB (Miniature), ACB (Air Blast), OCB (Oil), SF6 etc

Thermal Capability Low

Thermal Capability High

Cost is less

Cost is high

Cannot be operated on load

Can be operated on load

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