It is suited for water heater, strong emission gas water heater, solar water heater, air water heater, medical equipment refrigerator, food display case, Intelligence Toilet, hair dryer, straight hair, hairdressing and beauty appliance, foot bath, Massor, PC, TV, refrigerator, washing machine, oven, induction cooker, electric water heater, Cleaner, electric iron,l electric water pump, swimming pool, fish tank, electric mower, handheld power tool, as class I current leakage protection.