The OFKL-80A 4P is a four-pole integrated earth leakage circuit breaker that combines overload protection, short-circuit protection, and high-sensitivity residual current protection. This product is strictly designed in accordance with IEC international standards, featuring a compact four-pole structure capable of simultaneously interrupting all three-phase lines and the neutral conductor. It provides comprehensive circuit protection and personal electric shock protection for three-phase four-wire AC power distribution systems, effectively preventing equipment damage, fires, and electric shock accidents caused by electrical faults.