The contact device includes a movable contact that comes into contact with a first fixed terminal by moving a moving body to one side in one direction, and comes away from the first fixed terminal by moving the moving body to the other side in the one direction. The movable contact includes a first contact unit that comes into contact with the first fixed terminal. The first fixed terminal also includes a first surface with which the first contact unit comes into contact from a direction intersecting with one direction. The first contact unit includes a first contact piece on the first contact unit side that comes into contact with the first surface in a stretched manner in a state of being pressed to one side in one direction by the moving body.

A contact system in a low-voltage switch and a low-voltage switch are provided. The contact system comprises a bifurcated contact and a movable contact. The bifurcated contact has an upper bifurcated end and a lower bifurcated end. Electrical contact portions are respectively arranged on insides of the upper bifurcated end and the lower bifurcated end. Electrical contact portions are respectively arranged on upper and lower surfaces of an execution end of the movable contact corresponding to the electrical contact portions of the bifurcated contact. When the contact system is switched on and powered up, electrodynamic repulsion forces produced at the electrical contact portions of the bifurcated contact are offset, so that the contact system can stably maintain an ON state, thereby improving a short-time current withstand capability of a low-voltage switch using the contact system. (FIG. 1)