Difference between MCB and MCCB

Both MCB and MCCB are circuit breaker so most of the people are confused about the difference between them. One of the major difference between MCB and MCCB is that in MCB interrupting rating of under 1800 ampere whereas the MCCB interrupt rating of around 10000-200000 amperes. Before learning the difference between them first you check it out discussion inside to MCB and MCCB. 

What is MCB?


A miniature circuit breaker is an electromechanical device which protects the electrical circuit from overcurrent resulted due to overload, short circuit or anything which cause excessive current flow.
  • MCB is thermal/thermomagnetic devices.
  • It provides protection against over current and short circuits.
  • It is available in single, two three and four-pole version.
  • It commonly used in lighting circuits.
  • Available up to 100A and have maximum short circuit capacity of 25KA.

What is MCCB?


A moulded case circuit breaker is a circuit breaker and trip device assembled in a moulded case. It also operates in case of overload and short circuit. MCCB is commonly used for industrial applications for high power equipment.
  • It may be a thermal/thermo-magnetic/Electronic trip type.
  • It primarily provides protection against the current and short circuit.
  • It can provide protection against mainly on residual currents and under voltages.
  • Available up to the rating of 2500A.
  • Remote ON/OFF is possible with some additional accessories.
  • Some MCCBs are microcontroller based.
  • Available in a single. two, three and four-pole versions.

Difference between MCB and MCCB :

  • MCB stands for Miniature Circuit Breaker while MCCB stands for Molded Case Circuit Breaker.
  • MCCB and MCCB both are the thermomagnetic devices and they are classified under low voltages breaker.
  • Both are low voltage circuit breakers created to meet IEC( International electrotechnical commission) 947 standards.
  • MCB is a type of switch which protects the system from overload current whereas the MCCB protects the system from over-temperature and short circuit current.
  • MCB is a tripping circuit of the MCB is fixed while in MCCB is movable.
  • MCB is rated current not more than 125 Ampere, MCCB current rated up to 1600 A.
  • Interrupting current in MCB  under 10KA while In MCCB interrupting current range from around 10KA-85KA.
  • MCB has a single, two or three pole version whereas the MCCB has a single, two, three or four-pole version.
  • MCB is mainly used in a low current circuit while MCCB is mainly used in for the heavy current circuit.
  • MCB is used for home application, domestic purpose while MCCB is used in large industrial or commercial applications.
  • The remote ON/OFF is not possible in MCB but in MCCB  is possible by the use of shunt wire.

You may also learn about this topic:

No comments:

Post a Comment