An OFPM 4P RCCB is a high-performance electrical safety device designed for three-phase four-wire electrical circuits. It detects current leakage and quickly cuts off power to prevent electric shocks and potential fire hazards caused by insulation faults.

A 4P (Four-Pole) RCCB is specifically engineered for three-phase system protection with a neutral line, ideal for commercial and industrial setups. A 2P (Two-Pole) RCCB is intended for standard single-phase residential applications.

High-performance RCCBs provide crucial protection against ground faults. They respond in milliseconds to minor residual leakage currents, preventing severe injuries from contact with exposed live equipment and safeguarding sensitive machinery.

The OFPM 4P RCCB is commonly installed in main electrical distribution panels, industrial control cabinets, commercial buildings, and power systems requiring reliable three-phase ground fault protection.

It is recommended to press the integrated "T" (Test) button periodically—typically once a month—to verify that the mechanical tripping mechanism and internal residual current detection circuit are working effectively.