What are the uses of MCB (Miniature Circuit Breaker)?

The purpose of using Miniature Circuit Breaker (MCB) are Overload Protection and Short Circuit. MCB protects electrical circuits from failure.

1.Short Circuit

Short Circuit is an electrical failure. A short circuit is an accidental or intentional conductive path between two or more conductive parts.

2.Over Current

The over current is a multiple of the rated current.If too many devices are connected to one line and consume more energy than the line can carry,it is called overload.All components are fine,they just consume too much.

How about Moulded Case Circuit Breaker (MCCB)? Is the function same as MCB?