Thermally-sensible overcurrent protective relay including automatic resetting mechanism

Abstract

A thermally-sensible overcurrent protective relay comprising a toggle mechanism operable in connection with the bending operation of a bimetal bendable in response to current flowing through a main circuit a normally-open contact having a normally-open fixed contact element and a normally-open movable contact element both formed by a resilient conductive thin plate having a contact portion at one end thereof a normally-closed contact having a normally-closed fixed contact element and a normally-closed movable contact element both formed by a resilient conductive thin plate having a contact portion at one end thereof, and a mechanism adapted to be selected to an automatic resetting position and a manual resetting position in such a manner as to contact one surface of the contact portion of the normally-open fixed contact element at one end of a changeover lever pivotally rotatable to displace the normally-open fixed contact element toward the normally-open movable contact element and retain the normally-open contact in two positions at the other end of the changeover lever; wherein the normally-closed contact and the normally-open contact are interlockingly operated by the operation of the toggle mechanism.

Dependencies are inferred from the claim text.