The OFL7 Series 4P (Four-Pole) miniature circuit breaker is a full-pole protection device specifically designed for three-phase, four-wire (3P+N) low-voltage distribution systems. Its design strictly adheres to international electrotechnical standards, including IEC/EN 60898-1. Its core function is to provide synchronized overload and short-circuit protection for the three phase conductors (L1, L2, L3) and the neutral conductor (N) through a built-in, integrated four-pole mechanical linkage mechanism, while also achieving complete electrical isolation of the circuit. This product is a key component for preventing system risks caused by neutral conductor faults or abnormal potential, ensuring power supply safety for sensitive loads, and meeting the requirements of the highest-grade safety isolation standards. It is particularly suitable for power distribution scenarios in industrial, commercial, and data center applications that have stringent requirements for power supply continuity, operational safety, and system integrity.