Applied to the control circuit with AC 50Hz/60Hz and rated control power voltage up to 380V, NJYW1 series liquid level relay (hereinafter referred to as the relay) is mainly used for the automatic control of liquid level in civil water tower, high level water tank, underground water storage tank and etc. According to the user's wiring requirements, it can achieve the automatic control of water supply or drainage. This product cannot be applied to the level control of the liquid with poor conductivity, such as oil, purified water, flammable and explosive chemical liquid and sewage with high density. Standards:IEC 60947-5-1