Method for ambient temperature compensating thermostat metal actuated electrical devices having a plurality of current ratings
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United States of America Patent
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Jul 8, 2008
Grant Date -
Apr 19, 2007
app pub date -
Oct 14, 2005
filing date -
Oct 14, 2005
priority date (Note) -
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Abstract
A thermally actuated device, such as an electrical circuit breaker (10) is provided with an ambient temperature compensation thermostat metal member (38) selected so that it bends when subjected to changes in temperature and compensates for ambient temperature effects on a thermostat metal trip arm for a selected current rating. Movement of such thermostat metal member is directly proportional to the flexivity of the material and to the square of the length of the member and indirectly proportional to the thickness of the member. Since packaging constraints make changes in length impractical, compensation members used to provide temperature compensation for different current ratings of the device typically have been made by using members of different thickness. In accordance with the invention, ambient temperature compensation members for a family of devices having a plurality of different current ratings is provided by changing the effective length of respective blank thermal compensation members by stamping selected deformations (48c, 50c) appropriate for each current rating in respective blank compensation members.
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