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Molded Case Circuit Breakers (MCCB)

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MCCB- Molded Case Circuit Breakers

Molded Case Circuit Breakers or MCCB provides protection by combining a temperature sensitive device with a current sensitive electromagnetic device. It acts mechanically on the trip mechanism. The traditional molded-case circuit breaker uses electro mechanical or thermal magnetic trip units that may be fixed or interchangeable. A molded case circuit breaker is a type of electrical protection device that can be used for a wide range of voltages, and frequencies of both 50 Hz and 60 Hz. The main distinctions between molded-case and miniature circuit breaker are that the MCCB can have current ratings of up to 2,500 amperes, and its trip settings are normally adjustable. An additional difference is that MCCBs tend to be much larger than MCBs. MCCBs are used for a variety of purposes, for example they can be installed for a household purpose as well as industrial and commercial use.

Different types of Circuit Breakers

There are various types of circuit breakers that are in use these days like ACB which are rated current up to 10,000 A. They are usually electronically controlled where as some models are microprocessor controlled. A residual current device (RCD), or RCCB , Residual Current Circuit Breaker is an electrical wiring device that disconnects a circuit whenever it detects that the electric current is not balanced between the phase conductor and the neutral conductor. Such an imbalance is sometimes caused by current leakage through the body of a person who is grounded and accidentally touching the energized part of the circuit. Then there are MCBs or Miniature Circuit Breakers which are electro - mechanical devices which protect an electrical circuit from an over current. The over current, in an electrical circuit, may be a result of short circuit, overload or faulty design. An MCB is a better alternative to a fuse since it does not require replacement once an overload is detected.

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