Feeding device (1) for feeding a protection device used in a circuit breaker low voltage comprising: a) a first magnetic circuit (10) having a development closed designed to surround a primary conductor (11) for a phase protected by said protection device; b) a secondary winding (12) having as core a stretch of said first magnetic circuit (10); Said feed device comprises a second structurally separate magnetic circuit (20) of said first magnetic circuit (10), the said second magnetic circuit (20) operatively associated with said first magnetic circuit (10), so that, under operation, at least a portion of the main magnetic flux generated in said first magnetic circuit (10) by the circulating current in the primary conductor is absorbed by said second circuit in a proportion depending on the value of the current itself, characterized by the fact said second magnetic circuit (20) is operatively associated with said first magnetic circuit (10) so that surrounds said secondary winding (12) without wrapping said primary conductor.
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