Thermally-sensible overcurrent protective relay including automa

Details Thermally-sensible overcurrent protective relay including automa Thermally-sensible overcurrent protective relay including automa

1987-10-16

1988-11-15

Broome, H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 45, 337 73, H01H 7116, H01H 3770

Patent

active

047852747

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.

REFERENCES:
patent: 4635020 (1987-01-01), Sako
patent: 4652847 (1987-03-01), Sako

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