Abb Service S.r.l.

Abb S.p.a.

Abb Services S.r.l.

Eligio Zanchi

Lucio Azzola

Edoardo Scola

The present invention relates to a switching device, in particular an automatic switch, a disconnector or a contactor, with high dependability, for use preferably in low voltage electrical systems. In particular the invention relates to a single-pole or multi-pole double break switching device for low voltage systems comprising, for each pole, at least a first pair of contacts and at least a second pair of contacts. Each pair comprises a stationary contact and a movable contact which can be reciprocally coupled/decoupled at the level of a first breaking cavity and a second breaking cavity respectively. Said cavities are defined inside a casing which comprises a first surface with respect to which an internally hollow portion protrudes, said internally hollow being integrally made with at least one portion of the casing. The hollow portion defines, for each pole, one or more discharge channels each of which has a first section communicating with the corresponding first breaking cavity and a second section communicating with the environment outside the casing to permit the discharge of gas from the inside of the first breaking cavity.

Single pole or multi-pole double break switching devices

An electric pole for a low-voltage power circuit breaker, comprising an insulating enclosure () that has a lower wall, an upper wall, two side walls, a rear wall and a front wall, at least one arc chute, at least one fixed contact () and at least one moving contact () that can be mutually coupled/uncoupled, and a first electric terminal () and a second electric terminal () that are functionally associated with the fixed contact and the moving contact and allow electrical connection of the pole in input and in output, its particularity consisting of the fact that the insulating enclosure comprises a first half-shell () and a second half-shell () which are mutually coupled along corresponding coupling surfaces and form a self-supporting structure, the first and second half-shells being shaped so as to form at least one compartment () that is suitable to accommodate the fixed contact and the moving contact and the arc chute, and second () and third containment volumes (), which are arranged on mutually opposite sides with respect to the compartment and are suitable to accommodate respectively the first and second electric terminals.

Electric pole for a low-voltage power circuit breaker, and associated circuit breaker

A rotating contact supporting shaft for a low-voltage power circuit breaker, whose particularity consists of the fact that it has a modular structure that comprises, along the rotation axis, at least one first and one second supporting module (), each module being functionally coupled to at least one corresponding moving contact () of the circuit breaker and being provided respectively with first and second means () for connection to at least one first interconnection module (); the first interconnection module is interposed between the first and second supporting modules and is provided with third and fourth connection means () that are suitable to be coupled respectively to the first and second connection means; the coupling between the first and third connection means and between the second and fourth connection means allows the functional connection between the first and second supporting modules and the direct structural connection of the interconnection module to the first and second supporting modules.

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Alzano Lombardo, Italy

Eligio Zanchi