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Explanation: Here is one of many examples available on the net:
Direct current cutoff switch - Patent 7330097
In a direct current cutoff switch1, a PTC 5, which is a non-linear resistor, is parallel connected to a contact circuit composed of a fixed contact 4-2 and ... www.freepatentsonline.com/7330097.html - Similar pages -
by H Takeda - 2008 - Related articles - All 9 versions