28 September 2019

Difference between MCB and MCCB

Both MCB and MCCB are circuit breaker so most of 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. The differences make them application-specific in an electric circuit. 

What is MCB?

An MCB stands for a miniature circuit breaker is an electromechanical device that protects the electrical circuit from overcurrent resulted due to overload, short circuit or anything which causes excessive current flow. The most important advantage of using MCB over fuse is that the power supply can be resumed almost immediately. So that points MCB is better to fuse.

MCB is classified according to the tripping over the rage of fault current. It is most important for you to know what type of MCB trip curve to decide what type to use for different appliances for the correct electrical system. Before learning about type first understand the trip curve. Trip curve is essentially nothing but the maximum current that particular MCB can withstand. Here there are six different types of MCB, which are A, B, C, D, K, and Z.
  • MCB is a thermal/thermomagnetic device.
  • It provides protection against over current and short circuits.
  • It is available in single, two three and four-pole versions.
  • It commonly used in lighting circuits.
  • Available up to 100A and have a maximum short circuit capacity of 25KA.

What is MCCB?

An MCCB stand for, molded case circuit breaker is a circuit breaker and trip device assembled in a molded 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.
  • The size of the MCB is small but the size of the MCCB is big.
  • 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.
  • The cost of the MCB is low but the cost of MCCB is high.
  • MCB is used for home application, domestic purposes while MCCB is used in large industrial or commercial applications.
  • The remote ON/OFF is not possible in MCB but MCCB  is possible by the use of shunt wire.
  • A circuit breaker is installed for safety reasons.
  • Some of the MCCB units are specially made to respond to remote control signals, usually as standby power.
  • MCCB has a higher capacity than an MCB, both are classified under low voltage circuit breakers.
  • Both of the MCB and MCCB are highly durable and can last for years depending on the manufacturer.
  • Morden MCCBS has alarm system but there is no alarm system in MCB.

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