Adopting a two-set reinforced touchpoint structure design, equipped with two sets of normally open main touchpoints and one set of normally closed auxiliary touchpoints to meet the precise control requirements of multi-device synchronization on and off; the coil adopts a low-loss process, with low heat generation during operation, effectively prolonging the service life of the equipment. The shell protection level reaches IP20, suitable for the installation environment in the control cabinet; supports DIN rail or screw fixing, easy installation, meets IEC 60947-4-1 standard and RoHS compliance requirements, and can work stably in the environment of -25 ° C to + 60 ° C. It provides a safe and reliable on-off guarantee for low-voltage medium-power multi-loop control systems.