| 摘要 |
PROBLEM TO BE SOLVED: To exhibit a stabilized shielding performance against an excessive surge, even if there is a temperature rise by an electromagnetic energy or a self generation of heat by a large surge current due to a discharge energy. SOLUTION: In an SPD for direct lightning stroke, a zinc oxide varistor 10 is connected between a pair of terminals 30a, 30b, and a separator 20 for separating the zinc oxide type varistor 10 and the terminal 30b, is connected between the zinc oxide type varistor 10 and one of the terminal 30b. The separator 20 is constituted of a temperature fuse 22 which is made of a low melting metal which is melted by a generation of heat by deterioration of the zinc oxide type varistor 10 and is not melted by the self generation of heat by the surge current a rated withstand current or less, and a separation conductor 24 which is separated at a marginal withstand current beyond the rated withstand current of the zinc oxide type varistor 10 connected with the temperature fuse 22. COPYRIGHT: (C)2008,JPO&INPIT
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