The OFDX 4P is a high-performance four-pole Residual Current operated Circuit-Breaker specifically designed for three-phase four-wire low-voltage power distribution systems. This product employs a modular structure, with its core function being to provide highly reliable residual current (earth leakage) detection and protection, aiming to prevent the risk of electrical fires caused by circuit or equipment insulation faults. By continuously monitoring the vector sum of currents between the three-phase conductors and the neutral line, it can synchronously interrupt all poles upon detecting dangerous earth leakage current, achieving complete isolation of the faulty circuit. It is a key fire protection component in industrial, commercial, and infrastructure power distribution systems.