A switching device includes a switch housing and an electromagnetic system including an electromagnetic coil, a static iron core and a moving iron core. The switch housing includes an electromagnetic mounting cavity, in which the electromagnetic system resides, and a contact module mounting cavity, in which a contact module resides. The contact module includes a static contact, a moving contact and an arc-extinguishing chamber in the contact module housing. The moving iron core is connected to the moving contact and drives the moving contact in a straight line. The contact module housing has a first linkage hole through which a linkage member passes to connect the moving iron core with the moving contact. The contact mechanism is encapsulated, and mounted in the switch housing to reduce, the overall height of the switch, and the influence of an arc on the electromagnetic system.