ARC-EXTINGUISHING INSULATING MATERIAL MOLDING, AND CIRCUIT BREAKER USING THE SAME

PROBLEM TO BE SOLVED: To provide an arc-extinguishing insulating material molding that is capable of generating sufficient pyrolysis gas for extinguishing an arc generated upon circuit interruption, suppresses an amount of generated gas to prevent a housing from being damaged and has heat resistance capable of enduring a temperature rise occurring at that time and pressure resistance capable of enduring an internal pressure rise, and further to provide a circuit breaker using the same.SOLUTION: An arc-extinguishing insulating material molding used for a circuit breaker according to the present invention contains an inorganic filler B resolved at 350 to 1400°C in an amount of 5 to 50 wt.% and a matrix resin. 【課題】回路遮断時に発生するアークを消弧するのに十分な熱分解ガスを発生でき、また、筐体破損を無くすため発生ガス量を抑制し、その際に起こる温度上昇に耐える耐熱性、および、内圧上昇に耐えうる耐圧性を備えた消弧用絶縁材料成型体、および、それを用いた回路遮断器を提供すること。【解決手段】本発明は、回路遮断器に用いられる消弧用絶縁材料成形体であって、３５０℃〜１４００℃で分解する無機充填材Ｂを５〜５０重量％含み、マトリックス樹脂を含む、消弧用絶縁材料成形体である。【選択図】図６