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What is Circuit Breaker ?

 A circuit breaker is a switching device which also offers protection against short circuit. Unlike a fuse, the circuit breaker does not blow off but trips whenever there is a fault. The circuit breaker complies with IEC 60947-2 & can offer protection up to 150KA even beyond that, also a circuit breaker can offer a no of protections such as against:

Overload

Short Circuit

Under Voltage

Neutral

Earth Fault


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ABB Moulded Case Circuit Breakers, P. C. Customer Service Centre | ID:  19754258162

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A circuit breaker is not required to be replaced after tripping once, instead it must complete its total no of operations as declared by the manufacturer. The tripping time for the circuit breaker may vary w.r.t its type, for example. the trip time for MCCB is less than 10ms & the opening time for ACB shall be less than 30ms. Not only this, but MCCB also has a dedicated position for tripping, whenever the MCCB trips, but its actuator lever also comes in between i.e. neither in ‘ON’ nor in ‘OFF’ position.

According to the medium of arc quenching, the circuit breaker can be differentiated as below


SNO

MEDIUM OF ARC QUENCHING

CIRCUIT BREAKER

1

AIR

ACB, MCCB

2

VACUUM

Vacuum Circuit Breaker

3

GAS

SF6 Circuit Breaker

4

OIL

Oil Circuit Breaker


method of tripping, the circuit breaker can be below types


SNO

METHOD OF TRIPPING

CIRCUIT BREAKER

1

BIMETAL (for Overload) &

Armature (for Short Circuit)

Thermal Magnetic Type

2

ELECTRONIC

Microprocessor Type








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