A switch apparatus having pyrotechnic actuator includes a itch body and the pyrotechnic actuator. The switch body includes a static contact part which is fixed and a movable contact part which is movable. The pyrotechnic actuator is an independent modular construction and is fixedly mounted on the switch body from the outside of the switch body. The pyrotechnic actuator can ignite gunpowder to generate an explosive impact force that pushes the movable contact part away from the static contact part according to the load condition of the switch body, so as to assist the switch apparatus to be quickly disconnected.