Switch structure with overload protection

Details Switch structure with overload protection Switch structure with overload protection

2005-04-05

2005-04-05

Vortman, Anatoly (Department: 2835)

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

C337S056000, C337S091000

Reexamination Certificate

active

06876290

ABSTRACT:
A switch includes a casing and first and second conductive blades. A conductive strip made of a material that bends when subject to a temperature rise is fixed to the first blade and has a free end. A conductive plate is arranged inside the casing and in electrical connection with the second blade and movable between an engaged position where the conductive plate engages the conductive strip to form an electrical connection between the first and second blades and a disengaged position where the conductive plate disengages from the conductive strip to electrically disconnect the second blade from the first blade. When an overload occurs, an excessive current flows through the conductive strip, causing the strip to bend from a normal operation condition to a breaking condition that separates the conductive strip from the conductive plate. A link is coupled to the conductive plate and defines an elongated slot receiving the free end of the conductive strip therein. The elongated slot allows the conductive plate to move between the engaged and disengaged positions without causing movement of the conductive strip while when the conductive strip is in the breaking condition, the link drivingly couples the conductive strip to the conductive plate for returning the conductive strip back to the normal operation condition. A leaf spring is pivoted between the casing and the conductive strip to retain the conductive strip in the breaking condition until the conductive strip is driven by the link back to the normal operation condition.

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