| 摘要 |
PROBLEM TO BE SOLVED: To overlap electromagnetic coils such as a leakage trip coil and a high current instantaneous trip coil, etc., without restrictions to the winding turns and materials of the coils. SOLUTION: The whole bobbin wound with electromagnetic coils is composed of a large bobbin 12 and a small bobbin 11. Here, the large bobbin 12 is wound with a high current instantaneous trip coil 6, and the space 12b in the center of the large bobbin 12 is inserted with the small bobbin 11 wound with a leakage trip coil 7 and inserted with a plunger 13, thus the electromagnetic coils operating the plunger 13 are overlapped.
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