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Tuesday, August 27, 2013

What is the difference between MCB & MCCB?

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What is the difference between MCB & MCCB?

Best Answer - Chosen by Asker

MCBs are miniature circuit breakers with optimum protection facilities of overcurrent only.These are manufactured for fault level of up to 10KA only with operating current range of 0.5 to 63 Amps (the ranges are fixed), single,double and three pole verson.These are used for smaller loads -electronic circuits,house wiring etc.
MCCBs are Moulded case Circuit breakers,with protection facilities of overcurrent, earth fault.it has a variable range of 50% to 100% operating current.They can be wired for remote as well as local operation both.They are manufactured for fault levels of 16KA to 50KA and operating current range of 25A to 630Amps.They are used for aplication related with larger power flow requirement.
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Other Answers (8)

  • MOULDED CASE CIRCUIT BREAKER
    Load Line range of Moulded Case Circuit Breakers are designed and manufactured to world-class standards. Loadline series MCCBs provide overload and short-circuit protection for all applications. The thermal & magnetic elements, adjustable over a wide band, make these MCCBs ideal for any distribution application.

    Range :

    25A to 1600A in 5 frame sizes in single pole, three pole and four pole with switched neutral execution.

    Specification :

    Conforms to IEC:60947-1&2 / IS:13947-1&2.

    Features :

    Wide range : 25A to 1600A (AC)
    Compact dimensions
    Adjustable thermal setting (70-100% In).
    Adjustable magnetic setting (5-10 times In / 4-10 times In).
    Suitable for use as switch disconnector
    In 4PwSN version, neutral makes first and breaks last
    Push to trip button provision
    Uniform front escutcheon plate
    Positive dolly position indication
    Suitable for DC application upto 1600A
    Separate main and arcing contacts
    Wide range of accessories

    MASTER CIRCUIT BREAKER
    http://books.google.co.in/books?id=3AncN…
    • 1 person rated this as good
  • MCB is MINIATURE CIRCUIT BREAKER
    MCCB is MOULDED CASE CIRCUIT BREAKER
    MCB-A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.Rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Breakers illustrated above are in this category.
    MCCB (Moulded Case Circuit Breaker)—rated current up to 1000 A. Thermal or thermal-magnetic operation. Trip current may be adjustable in larger ratings.
  • MCB is a shortcut for Miniature Circuit Breaker, usually mounted as withdrawable type and used for small electronic equipment loads, while MCCB, is a Molded Case Circuit Breaker,usually used for motor and transformer loads, The latter is bolted mounted and usually has higher interrupting current rating than MCB's

    Source(s):

    www.MCB and MCCB's.
  • MCB miniature circuit breakers generally used for control circuits (Approximately 0.5 Amps - 15amps) power supply application.
    MCCB Molded case Circuit breaker - power application Generally 3 pole or 4 pole Start from 15Amps to 400Amps( some time more )

    Source(s):

  • MCB = miniature circuit breaker upto 100 ampere.

    MCCB = molded case circuit breaker upto 1000 ampere.

    Source(s):

    You may refer to SCHNEIDER ELECTRIC catalogues
    • 2 people rated this as good
  • Minature Circuit breaker (17.5-18mm width single pole up to 63A)

    Mould case circuit breakers (larger up and can be >>>63A)
  • MCCB have have many times more fault-current rating, than MCB.

    Hence MCB ( Miniature circuit breakers) are used on light loads, and help in fault-clearance at lower level.
  • MCB means moulded circuit breaker.
    MCCB means motor control circuit breaker.
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