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 I_CS & I_CU in term of Circuit Breakers.

I_CS = Service Braking Capacity (means, Circuit breaker can remove the fault, but it may not be usable afterwards.)

I_CU = Ultimate Braking Capacity (means, Circuit breaker can remove the fault and remain usable)