| 摘要 |
PROBLEM TO BE SOLVED: To rapidly suppress the shortcircuit current or overcurrent flowing in an electric circuit by specifying the main volume percent of a filler to be the percentage of particles with the mean diameter within a specific range. SOLUTION: Within the PTC resistor made of a compound material having high molecular mother material and a powdery filler of a conductive material buried in the mother material having electric resistor main body arranged between two contact terminals, the main volume percentage of the filler is the percentage of particles with less than 100μm and more than 5μm in the mean diameter. Since this PTC resistor extremely rapidly responds to shortcircuit or overcurrent, the current can be suppressed in the early time. Furthermore, this PTC resistor receives a relatively low energy thereby enabling the occurrence of overheated local region to be avoided without being affected by high thermal load or electric load.
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