Motor protector
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United States of America Patent
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May 12, 2015
Grant Date -
Apr 17, 2014
app pub date -
May 17, 2012
filing date -
Jun 28, 2011
priority date (Note) -
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Abstract
A motor protector of the present invention includes: a serial current path that is formed between a first terminal and a second terminal and that sequentially connects a fixed contact, the first terminal, a movable contact, a movable plate holding a bimetallic element, an intermediate fixing plate, a first electrode section, a first resistor, a second electrode section, and the second terminal, the fixed contact being held by a base member stored in an insulating resin case that includes an opening sealed by the sealing member; and a parallel current path that is formed between the first terminal and the intermediate fixing plate and that sequentially connects the first terminal, a conductive bottom plate, a second resistor (PTC) 19, and the intermediate fixing plate, wherein, after the first resistor produces heat due to an excessive current and the bimetallic element is thus thermally activated, thereby opening a contact, a current-interrupted state is also maintained because the high resistance of the PTC 19 maintains heat production.
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