PURPOSE: A shunt trip device is provided to improve the efficiency of mganetomotive force by increasing a magnetic flux moving path. CONSTITUTION: A moving core (313) is separately arranged on the opposite side of a fixed core. A yoke (314) is combined with the outside of a bobbin and surrounds the opposite sides of plates. A shield plate (315) is engaged with the yoke. The shield pate is inserted into the moving core.
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