Patent ID: 6642820
Filing Date: 2003-11-04
Classification: H01H

Abstract:
A protective switch comprising:a switch housing having top and bottom surfaces, a switching mechanism arranged in the switch housing and having a movable contact, a locking member for locking the movable contact after closing the same, and a breaking spring for urging the movable contact to open when the movable contact is closed by the locking member, said movable contact being opened when the locking member unlocks the movable contact, a tripping mechanism disposed adjacent to the switching mechanism for instantaneously pulling the plunger upon detection of an instant current, said tripping mechanism having a plunger with a first operating member and a return spring for urging the plunger, a tripping control device mounted on one side of the switch housing and having a second operating member, an alarm switch mounted on the other side of the switch housing and having an actuator, a back spring disposed on the bottom surface of the switch housing, and a trip member disposed adjacent to the tripping mechanism to be moved vertically with respect to the bottom surface of the switch housing, and including an upper trip member away from the bottom surface of the switch housing and a lower trip member close to the bottom surface of the switch housing and urged by the back spring in a direction away from the bottom surface, said upper trip member having a plunger operating section facing the first operating member of the plunger and a switch operating section facing the actuator of the alarm switch, said lower trip member having a locking member operating section facing the locking member and a tripping section facing the second operating member of the tripping control device.