Circuit breaker for low-voltage currents

Abstract

A circuit breaker for low-voltage currents, comprising an enclosure that contains moving contact means and fixed contact means, the moving contact means comprising at least one moving contact, the fixed contact means comprising at least one fixed contact, a kinematic chain that comprises a plurality of levers that move the moving contact between an open position, in which the contacts are separated, and a closed position, in which they are coupled, and a mechanism that ensures a substantially constant force between the contacts in the closed position, its particularity consisting of the fact that the mechanism comprises a single body that has a first rigid element, which is associated with at least one of the fixed and moving contacts, and a second rigid element, which is arranged adjacent to the first rigid element and is connected thereto by virtue of a flexible hinge constituted by a first elastic and resilient element.

Description

technical field [0001] The invention relates to a low-voltage current circuit breaker with improved characteristics, in particular, the invention relates to an automatic low-voltage circuit breaker which enables the movement of the circuit breaker according to the invention by means of a structurally simple and functionally effective solution The contact force between the contact and the fixed contact remains constant over time. Background technique [0002] As we all know, circuit breakers are protective devices that trip and cut off the current when an electrical fault occurs in the circuit into which the circuit breaker is connected; for this purpose, they have electrical contacts consisting of two conductive metal parts, one is The one that is fixed is called the fixed contact or the static contact, and the other that is movable is called the movable contact. The movable contacts are driven by the kinematic chain to couple or separate from the corresponding fixed contac...

AI Technical Summary

Problems solved by technology

Therefore, even though there may be sufficient contact between the electrical parts, the contact force cannot be maintained throughout the life of the circuit breaker, which will directly affect the opening time and contact resistance, which will eventually lead to a reduction in the electrical performance of the circuit breaker

[0008] A solution to the above problems is usually to act on the structure of the kinematic chain, but, although this can bring some improvements, it often leads to a more complex circuit breaker, which increases the cost of production and assembly

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