| 摘要 |
1. A magnetic trip device, in particular for an electrical protection apparatus such as a circuit breaker, able to cause tripping of the opening mechanism of the stationary and movable contacts of the apparatus when a sudden current increase occurs following for example a short-circuit, comprising at least one core called the moving core associated to a rod, the assembly being mounted sliding inside a sheath, a coil through which the current to be monitored flows and able to generate, when this current exceeds a certain threshold, a magnetic field designed to cause movement of the moving core and the rod between a rest position and a position in which an end of the rod forming a striker commands tripping of the above-mentioned mechanism, a means for channeling the magnetic field generated by the coil and an arcing horn electrically connected to one of the contacts and designed to guide the arc in the direction of the arc extinguishing chamber during breaking, characterized in that the means for channeling the magnetic field are formed by the above-mentioned arcing horn (13), said horn (13) being electrically connected to the stationary arcing contact and comprising a continuous arcing horn extending parallel to the axis of the coil, said horn being arranged so that the magnetic flux generated by the coil (11) and originating from the moving core (8) flows successively through the stationary contact (1) of the apparatus and the arcing horn (13) before rejoining the moving core (8), and that it comprises a moving core only. 2. The device according to claim 1, characterized in that the above-mentioned rod (9) is securely affixed to the moving core (8). 3. An electrical protection apparatus comprising a magnetic trip device according to claim 1 or 2. 4. A circuit breaker comprising a magnetic trip device according to either one of claims 1 and 2.
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