The load switch is composed of a chassis, a transmission mechanism, a support insulator, a switch and an arc extinguishing device. The chassis is welded from steel plates and equipped with a transmission mechanism. The switch is fixed to the chassis by the support insulator. The switch contact point is riveted with a limited contact and an arc-moving contact is installed at the end. The arc extinguishing device is composed of a device and a nozzle. The chassis is also equipped with a jumper, a cam and a fast closing spring for fast closing.