The OFL8 series four-pole (4P) miniature circuit breaker is a full-pole protection device specifically designed for three-phase four-wire (3P+N) low-voltage AC distribution systems. The product is developed in strict compliance with international electrotechnical standards. Its core design relies on a built-in integrated mechanical linkage mechanism to achieve simultaneous disconnection of the three phase lines (L1, L2, L3) and the neutral line (N). This circuit breaker not only provides precise overload and short-circuit protection for downstream lines and equipment, but also accomplishes complete electrical isolation of the circuit, thereby fundamentally eliminating safety hazards caused by ineffective isolation of the neutral line. Therefore, it is particularly suitable for industrial distribution, commercial distribution and data centre applications that demand high continuity of supply, operational safety, and system integrity, making it a core protection component.