MCCB, which stands for Molded Case Circuit Breaker, and RCCB, which stands for Residual Current Circuit Breaker, are two different types of circuit breakers that serve different purposes.

The main difference between MCCB and RCCB is that an MCCB is designed to protect against overcurrents and short circuits, while an RCCB is designed to protect against electrical shock and current leakage.

MCCBs are ideal for applications where a high level of protection against overcurrents and short circuits is required, such as in power distribution systems for buildings or industrial machines. They can handle high current loads and have a high breaking capacity to quickly interrupt the flow of current in case of a fault.

RCCBs, on the other hand, are used to protect people from electric shock caused by current leakage. Current leakage occurs when current flows through an unintended path, such as through a person's body, instead of through the intended circuit. RCCBs detect this leakage and quickly cut off the power to prevent harm.

In summary, MCCBs are designed for protection against overcurrents and short circuits, while RCCBs are designed for protection against electrical shock and current leakage. Each type of circuit breaker is important for different applications and provides valuable protection against potential hazards.