Overcurrent tripping device and circuit breaker employing same
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United States of America Patent
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Oct 22, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jun 13, 2016
filing date -
Jun 19, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
An overcurrent tripping device includes a tripping conductor connected to the main circuit; a fixed core inside which the tripping conductor penetrates and which is excited by current flowing through the tripping conductor; a movable core which is arranged to be opposed to the fixed core with a magnetic gap therebetween, and which forms a magnetic circuit in cooperation with the fixed core, and moves by being attracted by the fixed core when overcurrent flows through the tripping conductor; and a shaft fixed to the movable core to guide the movement of the movable core, and linked to the tripping mechanism of the circuit breaker, wherein the fixed core has a narrow gap formed in such a direction as to cross the magnetic circuit, so that magnetic saturation is suppressed by the narrow gap.
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