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The Residual Current Circuit Breaker (RCCB) is an essential electrical safety device that plays a crucial role in preventing electric shocks and protecting electrical circuits. Here is some general information about RCCB:

Purpose and Function:

  • The primary purpose of an RCCB is to quickly disconnect the electrical supply in the event of a leakage or imbalance in the current flow. It is designed to detect small current imbalances that may occur when there is a fault, such as current leakage to the ground, which could pose a risk of electric shock.


  • RCCBs operate by continuously monitoring the balance between the incoming and outgoing electrical currents. If there is a deviation, indicating a leakage or fault, the RCCB responds by tripping or disconnecting the circuit, preventing potential harm.


Two-pole RCCB:This type protects against both line and neutral conductor faults.

Four-pole RCCB:In addition to line and neutral protection, it also provides protection for the residual currents on the earth (ground) conductors.


  • RCCBs are commonly used in residential, commercial, and industrial electrical installations. They are a critical component in electrical distribution panels, providing an additional layer of safety.

Differences with Other Devices:

  • RCCB vs. ELCB: The term "ELCB" (Earth Leakage Circuit Breaker) is often used interchangeably with RCCB. However, ELCB is an older term, and modern installations typically use RCCBs, which are more advanced and provide better protection.

  • RCCB vs. MCB: While RCCBs focus on detecting and protecting against current imbalances, Miniature Circuit Breakers (MCBs) are designed to protect against overloads and short circuits. They serve complementary roles in ensuring electrical safety.

  • RCD vs. RCCB: The terms Residual Current Device (RCD) and RCCB are often used interchangeably. An RCD is a broader category that includes both RCCBs and other devices designed to detect residual currents and provide electrical safety.

In summary, an RCCB is a vital component in electrical systems, offering protection against electric shocks by swiftly disconnecting the power supply when it detects abnormal current flows.