Open dynamic relay

The utility model belongs to the electric power field, concretely relates to open dynamic relay. Including the shell, be equipped with two stationary contacts on the shell, be first stationary contact and second stationary contact respectively, two stationary contacts belows are equipped with the sheetmetal, and the sheetmetal both ends correspond with two stationary contacts and set up first movable contact and second movable contact, swing joint connecting rod in the middle of the sheetmetal, the sheetmetal below is equipped with armature, armature and connecting rod swing joint, on the shell was all fixed at the both ends of connecting rod, the connecting rod outer lane set up the spring, and open dynamic relay inside still is equipped with the coil. The utility model discloses simple structure, it is practical convenient, adopt low current starting heavy current, starting switch's frequent damage is avoided to the protection motor.