| 摘要 |
Terminal plates 4 and 33 of respectively a first resistance element module having a first polymer PTC 2 and a second resistance element module having a second polymer PTC 32 are caulked above and below a column 37 and fixed to a body casing 13 together with the fixed end of a movable plate 15 interlocked with a bimetal 14 and a second terminal 17. The other terminal plates 5 and 34 respectively of the first and second resistance element modules are arranged with a gap for absorbing the volume expansion caused when each polymer PTC generates heat with respect to the inner wall of the body casing 13. The current for an external load between a first terminal 34-2 and the second terminal 17 is interrupted by externally energizing the second terminal 17 and a second connection unit 5-1, the current interruption is self-sustained.
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