MCB and MCCB are both circuit breakers, but they are quite different in the way they function, which also determines how and what you use them for. But before we proceed further, you should understand that MCCB simply stands for Molded Case Circuit Breaker, while MCB simply means Miniature Circuit Breaker.
The major thing that differentiates between the two is their capacity, where the MCB can provide an interrupting rating of 18,000 amps, a normal rating of under 100 amps. You may also not be able to adjust their trip characteristics since they cater basically too low circuits. Conversely, the MCCB can provide a current that would be as 10 amps or as high as 2500 amps.
They can provide an interrupting rating that ranges between 10,000 amps and 200,000 amps. For MCCB, you can adjust their trip, especially for the higher models. Hence, you can install the MCB for your home use, while the MCCB is highly recommended for industrial use.