Abb S.p.a.

Abb Service S.r.l.

Nicola Bresciani

Roberto Rota Martir

Luigi Bonetti

Alessio Bergamini

Pierantonio Arrighetti

Marco Bonfanti

Andrea Balestrero

Described herein is a switching apparatus for low or medium voltage electric grids, which includes one or more electric poles. Each electric pole includes: an outer casing defining an internal volume of the electric pole; a fixed contact assembly accommodated in the internal volume of the electric pole and including a fixed contact member extending along a longitudinal axis of the electric pole; at least one movable contact assembly accommodated in the internal volume of the electric pole; an actuation member accommodated in the internal volume of the electric pole and arranged coaxially and externally relative to the fixed contact member, so that the fixed contact member passes through the actuation member along the longitudinal axis. The actuation member is slidingly movable along the fixed contact member. When moving between the first and second actuation positions, the actuation member transiently couples to each trip mechanism to actuate the trip mechanism.

Switching apparatus for electric grids

A pole actuation booster mechanism for a four-poles low voltage circuit breaker, which includes: a first operating member adapted to be operatively connected to the operating shaft of the circuit breaker and moving together with said shaft during its rotation from an open position to a closed position, and vice-versa, of said circuit breaker over a range of movement having a first, a second and a third portion of movement, the first operating member having a first operating end; an operating assembly including at least an elastic element operatively connected to a lever, the first operating member being disengaged from said operating assembly during the first portion of its movement and engaged with the lever during the second and third portions of its movement. During a closing operation of the circuit breaker the first operating member moves first along the first portion of movement driven by the operating shaft and disengaged from the operating assembly, then moves along the second portion of movement driven by the operating shaft and engaged with the lever and transmitting energy to the operating assembly; and finally moves along the third portion of movement driven by the lever and transmitting energy to the operating shaft.

Pole actuation booster mechanism

The present application contemplates a switching device comprising: an outer casing defining an internal volume of the switching device; one or more electric poles, each electric pole comprising one or more mobile contacts and one or more contacts adapted to be coupled or uncoupled during a switching operation of the switching device; a contact shaft accommodated in the internal volume of the switching device and adapted to rotate about a rotation axis during a switching operation of the switching device, the contact shaft having a body comprising one or more contact seats to accommodate at least partially the mobile contacts, so that the mobile contacts rotate with the contact shaft about the rotation axis during a switching operation of the switching device; a control mechanism comprising a supporting frame fixed to the outer casing to provide support to movable members of the control mechanism and one or more connecting rods to provide a force to move the contact shaft during a switching operation of the switching device.

Switching device with a suspended mobile contact assembly

A low voltage switch pole which comprises an insulating casing having lateral walls and a front and a rear wall and defining an internal space with a contact area and an arc extinguishing area, a fixed contact assembly and a movable contact assembly being positioned in said contact area, said movable contact assembly being movable between a closed position in which it is into contact with said fixed contact assembly and an open position in which it is spaced apart from said fixed contact assembly, an arc chamber comprising a plurality of substantially parallel metallic plates inserted into an enclosure made of insulating material being positioned in said arc extinguishing area; the switch pole further comprises an insulating wall which is positioned in said internal space between said contact area and said arc extinguishing area and partially separates said contact area from said arc extinguishing area, a channel connecting said contact area to said arc extinguishing area being provided in said insulating wall.

Low voltage switch pole

Embodiments of an automatic single- or multi-pole circuit breaker for use in low-voltage applications are disclosed. The circuit breaker includes at least a first fixed contact this is coupled/uncoupled with a first moving contact. The moving contact is operatively connected to an operating mechanism that enables its displacement. The circuit breaker includes a kinematic tripping device driven by means of a first separating movement of the moving contact away from the fixed contact. The kinematic tripping device includes an operative member capable of tripping the operating mechanism, which in turn takes effect on the moving contact, thus determining a second rapid separating movement until the circuit breaker tripped position is reached.

Automatic circuit breaker with tripping device activated by a movable contact

The present invention relates to an automatic switch () to be used preferably in low-voltage systems. The automatic switch () comprises an outer casing () containing for each pole at least one fixed contact () and at least one mobile contact () housed in a corresponding seat () provided on a mobile element () operatively connected to a control mechanism () to enable its movement. The automatic switch () according to the invention comprises means for the support of the mobile element (), which are constrained to a structural part () of the control mechanism (). Said supporting means support the mobile element () through hinge connection means to provide a center of rotation for the mobile element itself.

Circuit breaker with suspended mobile contact assembly

Described herein is a low-voltage circuit-breaker, which comprises at least one mobile contact and a corresponding fixed contact, and a positive-opening-operation device. The positive-opening-operation device in turn comprises: a moving element associated to the mobile contact; a first kinematic chain, operatively associated to said mobile contact and to an actuating device; and a second kinematic chain, associated to said moving element and to said first kinematic chain. A first lever is associated to the first kinematic chain and a second lever is associated to the second kinematic chain, said first and second levers interacting with one another during the opening operation and being equipped with blocking devices in the event of welding of the contacts together.

Low-voltage circuit-breaker and corresponding positive-opening-operation device

A low-voltage circuit breaker, comprising:

Low-voltage circuit breaker

A low-voltage circuit breaker, comprising: a rotating contact supporting shaft, is provided with a seat that accommodates the central body of a moving contact so that the first arm protrudes externally from the seat, at least one first spring and one second spring being furthermore arranged in the contact supporting shaft and being suitable to ensure, when the circuit breaker is closed, an adequate contact pressure between the active surface and the fixed contact; the particularity of the circuit breaker consisting of the fact that a first pivot is fixed to the contact supporting shaft and is coupled to a hole formed in the central body, engagement means and at least one second pivot being furthermore arranged on the shaft on mutually opposite sides with respect to the first pivot, the second pivot being movable with respect to the shaft and to the moving contact, the first and second springs being furthermore anchored to the second pivot and to the engagement means and being arranged along two opposite sides of the arm of the moving contact, the second pivot interacting functionally with the first cam-like surface so as to generate a mechanical moment that matches the direction of rotation of the moving contact during at least one portion of the step for separation of the active surface from the fixed contact in a short-circuit condition.

Growing community of inventors

Bergamo, Italy

Nicola Bresciani