The difference between MCB (Miniature Circuit Breaker) and RCCB (Residual Current Circuit Breaker)

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MCB (Miniature Circuit Breaker) and RCCB (Residual Current Circuit Breaker) are two different types of electrical protection devices commonly used in electrical installations. Here are the differences between them:


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MCB is primarily designed to protect electrical circuits from overcurrent, such as short circuit or overload conditions. It monitors the current flowing through the circuit and trips off automatically if it exceeds the specified limit.

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On the other hand, RCCB is specifically designed to provide protection against electrical leakage or residual current. It senses the difference in current between the live and neutral conductors and trips off if any human or equipment leakage current is detected.

Operation: MCB operates on an electromagnetic trip mechanism that responds to high overcurrent conditions or a thermal trip mechanism that responds to continuous overload. It can be manually reset after tripping. RCCB operates on a residual current detection mechanism that continuously monitors the current imbalance between the live and neutral conductors. It doesn't require manual resetting as it automatically trips off when leakage current is detected.

Sensitivity: MCBs are available in various current ratings and are designed to handle a specific range of currents. They are generally less sensitive compared to RCCBs.

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RCCBs are more sensitive and can detect even small levels of leakage current, typically ranging from 10mA to 300mA, depending on the type.

Application: MCBs are commonly used for protecting electrical circuits in homes, offices, and industrial applications against short circuits and overloads. RCCBs are widely used in areas where electrical safety is crucial, such as residential buildings, hospitals, and places with water or moisture, as they provide additional protection against electric shock caused by earth faults or leakage currents.

There is a difference between MCB (miniature circuit breaker) and RCCB (residual current circuit breaker) in terms of functionality, operation, sensitivity and application. MCB is mainly used to protect circuits from overcurrent and RCCB is specially designed to provide leakage or residual current protection.

It is important to consult with a qualified electrician or refer to local electrical regulations to determine the correct usage and installation requirements of MCBs and RCCBs in specific situations.



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