An RCCB (also known as RCD or Residual-Current Device) is an electrical wiring device designed to disconnect a circuit when it detects currents leaking to the earth wire.
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RCCBs are available in different pole configurations:
2 Pole RCCB: Used for single-phase supply connections (live and neutral wires).
4 Pole RCCB: Suitable for three-phase supply connections.
Sensitivity ratings include 30 mA, 100 mA, and 300 mA.