Patent ID: 6924445
Filing Date: 2005-08-02
Classification: H01H

Abstract:
1. A low-voltage circuit breaker, comprising: at least one first fixed contact, which is electrically connected to a terminal for connection to an electric circuit; a rotating moving contact, which comprises a central body from which at least one first arm protrudes, an active surface being provided at the end of said first arm, said active surface being associable/separable with respect to said fixed contact by means of a rotation of said moving contact; a rotating contact supporting shaft, which is functionally connected to an actuation mechanism of the circuit breaker and is provided with a seat that accommodates the central body of the moving contact so that the first arm protrudes externally from said seat, at least one first spring being furthermore arranged in said contact supporting shaft, said first spring being functionally coupled to the moving contact and being suitable to ensure, when the circuit breaker is closed, an adequate contact pressure between the active surface and the first fixed contact; characterized in that at least one first abutment surface is provided on said central body of the moving contact and is suitable to act, during a rotation of the moving contact caused by a short-circuit, against a complementarily shaped surface formed in said seat of the shaft, so that at least part of the energy accumulated by the rotating moving contact during its rotation is transmitted directly to the shaft.