Tuesday, 26 January 2016

MCCB  MCB

MCB:

  • MCB stands for “Miniature Circuit Breaker”.
  • Rated current under 100 amps.
  • Interrupting rating of under 18,000 amps
  • trip characteristics may not be adjusted
  • Suitable for low current circuits (low energy requirement), i.e. home wiring.
  • Generally, used where normal current is less than 100 Amps.

MCCB:
  • MCBB stands for “Molded Case Circuit Breaker”.
  • Rated current in the range of 10-2500 amps.
  • Thermal operated for overload and & Magnetic operation for instant trip in SC (Short circuit conditions)
  • Interrupting rating can be around 10k – 200k amps.
  • Suitable for high power rating and high energy i.e. commercial and industrial use.
  • Generally, used where normal current is more than 100 Amps.

Difference between ICS & ICU in term of Circuit Breakers.

ICS = Service Braking Capacity (means, Circuit breaker can remove the fault, but it may not be usable afterwards.)
ICU = Ultimate Braking Capacity (means, Circuit breaker can remove the fault and remain usable)

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