Limiting circuit breaker equipped with an electromagnetic effect contact fall delay device
AssigneeMerlin Gerin
InventorsJean-Pierre Nebon, Pascal Dudon, Patrick Coudert, Robert Morel
Life of this patent
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Abstract
A limiting circuit breaker comprises an electrodynamic repulsion contact system, and an electromagnetic latch arranged in the vicinity of the contact system, and electrically insulated from the latter. Actuation of the latch to the active position results from the action of the electromagnetic field due to a short-circuit current flowing in the pole, so as to temporarily keep the movable contact open after repulsion. The latch is equipped with a pair of ferromagnetic brackets, and with a spring blade to return to an inactive position.
Claims10
A limiting circuit breaker with a molded insulating case, comprising in each pole:
- an electrodynamic repulsion contact system having a conducting support arm equipped with a first contact, and a movable contact having at least a second contact cooperating in the closed position with the first contact, said movable contact being driven to the open position by electrodynamic forces generated during a first repulsion phase after the current has exceeded a preset threshold,
- and an electromagnetic latch controlled by the flow of current in the pole, and capable of occupying an active position to temporarily keep the movable contact open after repulsion, wherein the electromagnetic latch comprises a magnetic circuit surrounding the support arm in the vicinity of the first and second contacts, and equipped with bearing means in the form of ramps urging the latch to an inactive position due to the return effect of the movable contact.
Dependencies are inferred from the claim text.