Air Circuit Breaker

Schneider Electric (NW&NT) air circuit breaker 

Air Circuit Breaker (ACB)

The type of circuit breaker, which operates in air (where air-blast as an arc quenching medium) at atmospheric pressure, is known to be an Air Circuit Breaker. Air circuit breaker has completely replaced by oil circuit breaker. In different countries, still it is a preferable choice to use an Air circuit breaker up to 15KV because, there is no chance of oil fire like in oil circuit breaker.

MCCB & Trip Unit

What is a Circuit Breaker?

Schneider Electric 

The definition of a circuit breaker varies between the standards organizations, but the most commonly used definitions are:  

Defines circuit breakers as “devices designed to open and close a circuit by non-automatic means, and to open the circuit automatically on a predetermined overcurrent without injury to itself when properly applied within its rating.

a mechanical switching device, capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking currents under specified abnormal circuit conditions such as those of short-circuit.

MCB

What is The MCB ?

Schneider Electric

The definition of MCB is Miniature Circuit Breaker . MCB is electromechanical device which is used to protect electrical circuit from the overcurent which may caused due to ( short circuit , overloads or faulty design). It interrupts the continuity of electrical flow through the circuit once a fault is detected . now we can define the MCB as a switch which automatically turns off when the current flowing through it passes the maximum allowable limit.