What is the difference between MCB & MCCB, where it can be used?

By Bharat Ribadiya -
Most people are confused about the differences between MCB and MCCB. Although both are circuit breakers, there key differences makes them specially made for specific jobs. 

 MCB is miniature circuit breaker which is thermal operated and uses for short circuit protection in small current rating circuit. Normally it is used where the normal current is less than 100A. 

 MCCB moulded case circuit breaker and is thermal operated for overload current and magnetic operation for an instant trip in short circuit condition. Under voltage and under frequency may be inbuilt. Normally it is used where normal current is more than 100A.

 The main difference between the both circuit breakers is their capacity. The MCB is mainly used for low-energy requirements like home wiring or small electronic circuits and the MCCB is more suited in providing energy for high-power equipment.

 Key Differences: 

  • An MCB has less than 100 amps while an MCCB goes as high as 2,500 amps.
  • The interrupting rating for an MCB is 18,000 amps up to 200,000 amps for an MCCB.
  • MCBs are mostly installed for home use while an MCCB is generally utilized for commercial or industrial purposes.
  • Both are low-voltage circuit breakers created to respond to IEC 947 standards.
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