| 摘要 |
A supply device ( 1 ) for an electronic protection device to be used in a low-voltage circuit breaker. The supply device basically comprises a primary conductor ( 11 ), a secondary winding ( 12 ), a first magnetic circuit ( 10 ), and at least one second magnetic circuit ( 20 ). The first magnetic circuit ( 10 ) is such as to surround said primary conductor ( 11 ), which is related to a phase protected by the protection device; at the same time, the first magnetic circuit ( 10 ) constitutes the core of said secondary winding ( 12 ) that is used for supply of the protection device. The second magnetic circuit ( 20 ) is structurally separated from the first magnetic circuit ( 10 ), but is operatively connected thereto for subtracting part of the first magnetic flux generated within it by the current circulating in the primary conductor ( 11 ).
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