Howe Mounded Case Circuit Breaker (MCCB) Works ?

A Mounded Case Circuit Breaker (MCCB) breaker will automatically trip when the current through it exceeds a pre-determined value.  In lower current ratings, automatic tripping of the circuit breaker is accomplished by use of thermal tripping devices.

A  circuit  can  be  connected  or  disconnected  using  a  circuit  breaker  by  manually  moving  the operating handle to the ON or OFF position. The mounded-case circuit-breakers are used in industrial and civil low voltage plants with service currents from 1 to 1000 A. They are used in direct and alternating current distribution switchgear, for motor protection (Motor Control Center), generators, capacitors and for end users. It is normally installed very close to the energy meter and should be readily accessible to the consumer.

Mounded Case Circuit Breaker (MCCB)

The over load and instantaneous tripping elements are adjustable over the wide band make. The molded case circuit breakers are the important units used in electrical protection and control. The switching mechanism is enclosed in the mounded case. Molded case circuit breakers come in a wide range of sizes and current ratings.   There are six frame sizes available:   100, 225, 400, 600, 800, and 2,000 amps.   The size, contact rating, and current  interrupting  ratings  are  the  same  for  all  circuit  breakers  of  a  given  frame  size.  The continuous  current  rating  of  a  breaker  is  governed  by  the  trip  element  rating.