Thermal overload relay with mis-readjustment preventing device

Details Thermal overload relay with mis-readjustment preventing device Thermal overload relay with mis-readjustment preventing device

1995-03-07

1996-12-31

Phillips, Michael W.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 37, H01H 6100

Patent

active

055898092

ABSTRACT:
A thermal overload relay is formed of a case for retaining the relay and having an insertion hole, an adjusting device for adjusting a working current of the relay and situated inside the insertion hole, and a cover for covering the adjusting device and situated in the insertion hole. The case includes a first coupling device formed around the insertion hole. The cover is formed of a transparent plate and includes a smooth upper surface, a second coupling device formed on a side surface and engageable with the first coupling device, and a handle formed on the upper surface of the cover for handling the cover. When the cover is disposed in the insertion hole, the first and second coupling devices are engaged, wherein the upper surface of the cover is located below an upper surface of the case. The cover can be fixed to the case such that the cover can be removed from the case or permanently fixed to the case.

REFERENCES:
patent: 4986097 (1991-01-01), Derman
patent: 5224514 (1993-07-01), Taylor

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