External operation thermal protector
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United States of America Patent
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Jun 10, 2014
Grant Date -
Jan 17, 2013
app pub date -
Sep 14, 2012
filing date -
Apr 10, 2008
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Abstract
The present invention relates to an external operation thermal protector incorporating two thermal plates, each having a first resistance element module having a first polymer PTC element and a second resistance element module having a second polymer PTC element fixed to a body casing together with the fixed end of a movable plate interlocked with a bimetal and a second terminal. Two gaps for absorbing the volume expansion caused when each polymer PTC element generates heat are provided between the plates and the inner walls of the body casing. The current for an external load between a first terminal and the second terminal is interrupted by externally energizing the second terminal and a second connection unit, the current interruption is self-sustained.
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