Importance

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Abstract

The present invention relates to a protection device comprising a resin base, a first terminal, a PTC component, a bimetal component, an arm, an upper plate and a resin cover wherein flexibility of connecting to a lead or other electrical elements is high and sensitivity to the abnormal heat generation occurring outside is high. The protection device of the present invention comprises a resin base, a first terminal, a PTC component, a bimetal component, an arm, an upper plate and a resin cover; and the first terminal, the PTC component, the bimetal component, the arm and the upper plate are superposed in the above-mentioned order within a resin housing defined by the resin base and the resin cover, the portion of the upper plate is exposed at the portion of the resin cover, and the exposed portion functions as a second terminal, the first terminal, the arm and the upper plate are electrically connected in series in the above-mentioned order, and in an abnormal state where the bimetal component is activated, the first terminal and the arm become to be electrically cut off while the first terminal, the PTC component, the bimetal component, the arm and the upper plate become to be electrically connected in series in the above-mentioned order.

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First Claim