Patent ID: 6664884
Filing Date: 2003-12-16
Classification: H01H

Abstract:
A switch comprising:a casing defining an interior space; two pairs of conductive blades, each comprising first and second conductive blades arranged and fixed in the interior space, the first and second blades having tails extending beyond the casing for external connection; a conductive strip made of a material that bends from a normal operation condition to a breaking condition when subject to a temperature rise, the strip having an end fixed to the first blade of each conductive blade pair and an opposite, free end; a conductive seesaw plate rotatably supported in the casing and in electrical connection with the second blade of each conductive blade pair, the seesaw plate being rotatable between engaged position where a first end of the seesaw plate engages the free end of the conductive strip thereby forming an electrical connection between the first and second blades of the associated conductive blade pair and a disengaged position where the first end of the seesaw plate disengages from the conductive strip thereby electrically disconnecting the second blade from the first blade; a coupler made of insulation material coupled between the conductive strips of the conductive blade pairs; wherein with the conductive strips at the normal operation condition and the seesaw plates at the engaged position, when an excessive current flows through one of the conductive strips, the temperature of the conductive strip rises, causing said one conductive strip to bend and move to the breaking condition and breaking the electrical connection between the first and second blades of the conductive blade pair associated with said one conductive strip and wherein the movement of the first conductive strip causes the coupler to force a second one of the conductive strips to bend and move in unison with the first conductive strip thereby breaking the electrical connection between the first and second blades associated therewith at the same time.