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MCB and MCCB, differences between MCB and MCCB

Differences between MCB and MCCB, and characteristics

The first thing here is to know the meaning of the abbreviations MCB and MCCB.
What does MCB and MCCB stand for?
  • MCB stands for Miniature Circuit Breaker.
  • MCCB stands for Molded Case Circuit Breaker

MCB and MCCB

Miniature Circuit Breaker (MCB)

It is an electromechanical device used to protect a low load electrical circuit. It is thermally operated and used for protection against over load, heating and short circuits, in circuits requiring a small current rating (less than 100A). It is designed to replace the ancient fuse rewirable device.
The Miniature circuit breaker (MCB) functions as an automatic switch OFF device which routinely turns OFF when the current flowing through it passes the threshold (maximum acceptable limit). This is achieved through the use of a bimetallic strip which protects against overload and the use of a solenoid which protects against short circuit.

Application of MCB: low load domestic and industrial installations.


MCB
An MCB

Characteristics of a Miniature Circuit Breaker (MCB)

  • Thermal/magnetic operation
  • MCB Current Rating: less than or equal to 100A.
  • MCB breaking capacity: 10 KA, at a voltage level of 230 or 440V.
  • Pole availability: MCB is available in single pole, two pole, and three pole.
  • MCB tripping circuit is fixed.
  • Remote ON/OFF: is not possible.

Molded Case Circuit Breaker (MCCB)

It is an electromechanical device used to protect a heavy load electrical circuit. It is thermally operated for protection against overload current and magnetically operated for protection against short circuits and is used in circuits requiring a current rating of more than 100A. It may also have an inbuilt under voltage and frequency protection system. Unlike a rewirable fuse, it can simply reset.

Application of MCCB: heavy load commercial and industrial installations.

Characteristics of a Molded Case Circuit Breaker (MCCB)

  • Thermal/magnetic operation
  • Current rating of MCCB: up to 3000A.
  • MCCB breaking capacity: up to 150kA
  • MCCB tripping circuit is movable
  • MCCB pole availability: single pole, two pole, three pole, four pole.
  • Remote ON/OFF may be possible.
MCCB
An MCCB

EKETECH

Types of Circuit Breakers


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Location: Nigeria

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