YFM2LE series residual current protection circuit breaker (hereinafter referred to as "circuitbreaker") is a leakage circuit breaker developed by our company with overload, short circuit.overvoltage, undervoltage, power side zero break, power side tripping, leakage, phase loss.mutation (special wave), reclosing and other tripping functions. lt is suitable for low-voltagepower grid with three-phase four-wire neutral line directly grounded. lt is used to providecontact protection against the danger of electric shock to equipment and people, and can alsobe used for grounding faults of lines or electrical equipment.Reference for the preparation of this technical specification:GB14048.2-2008 Low voltage switchgear and control equipmentGB/T22710-2008 Electronic controller for low voltage circuit breakersGB/T22387-2008 Residual current operating relayGB/Z 6829-2008 Residual current action protector General requirements