The insulator is used to operate the three-phase knife opening and closing movement. The conductive part is composed of a contact, a knife and a contact seat, and is pressed by a spring. When the switch is opened, the rotating shaft is driven by the operating arm to rotate, so that the operating insulator is upward.
The blade and the contact are separated against the blade, the blade rotates around the contact base, and the contact moves up to the opening position under the driving of the blade. When closing, the rotating shaft is driven by the operating arm to rotate, so that the operating insulator pulls the switch The knife rotates downward, and drives the contact to rotate after it meets the contact, and then turns to the closing position.