Contact with a magnetic compensator
AssigneeLa Telemecanique Electrique
InventorsJean P. Guero, Guy H. Lacan
Life of this patent
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Abstract
A contact that has two fixed contact elements and a mobile contact bridge actuated by a switching assembly and is urged by a pole spring. The connection between the mobile contact bridge and switching assembly is provided by a magnetic compensator connected to the switching assembly by means of a magnetic coupling device adapted so that, when the compensating forces rise above a given threshold, the magnetic compensator is disengaged from the switching assembly and becomes inoperative.
Claims15
A contact equipped with a magnetic compensator with automatic self-disconnection from a compensating force threshold, this contact comprising at least two fixed contacts and a mobile contact bridge actuated by a switching assembly and having at least two mobile contacts which are applied respectively, under the effect of a spring, to the two fixed contacts in the closed position of the contactor, the connection between the mobile contact bridge and the switching assembly being provided by means of a magnetic compensator generating a compensation force tending to apply the mobile contacts on the fixed contacts under the effect of a current passing through the mobile contact bridge and this against the action of the repellent forces which are then exerted between these contacts, wherein the connection between the magnetic compensator and the switching assembly is provided by a magnetic coupling device adapted so that when said compensating forces rise above a predetermined threshold, the magnetic compensator is disengaged from the switching assembly and becomes inoperative and consequently a very sudden variation of the resultant repellent force exerted at the level of the contacts is obtained with very rapid opening of the contactor to the frankly open position.
A contact maker-breaker comprising at least one contact circuit of the type comprising, in accordance with one of the preceding claims, at least two fixed contacts and a mobile contact actuated by a switching assembly and having at least two mobile contacts which are applied respectively, under the effect of a spring, on the two fixed contacts in the closed position of the contactor, the switching assembly being fixedly mounted on the armature of an electromagnet and connected to the mobile contact point by means of a magnetic compensator, the connection between the magnetic compensator and the switching assembly being formed by a magnetic coupling, further comprising a quick-break contact for the power supply circuit of the coil of the electromagnet whose mobile part is connected to said first soft magnetic material piece of the magnetic compensator.
Dependencies are inferred from the claim text.