Abb Service S.r.l.

Abb S.p.a.

Abb Services S.r.l.

Severino Colombo

Federico Gamba

Antonio Maria Gabello

Osvaldo Carrara

Francesco Casalinuovo

A low-voltage circuit breaker comprising a casing containing at least one fixed contact and at least one mobile contact. The circuit breaker moreover comprises, inside said casing, a first communication bus, designed to interface a plurality of accessories and devices of said circuit breaker, and an interface unit, which comprises a plurality of ports that are designed to be connected to said accessories and devices via said first communication bus.

Low-voltage circuit breaker comprising an interface unit

An electronic tripping device for low-voltage circuit-breakers comprises means for detection and calculation of a ground-fault current operatively connected to tripping means of said circuit-breaker. The means for detection and calculation comprise: current-sensor means, which supply, for each pole, a signal proportional to the current; means for detection of the sign of the current, which, for each pole, supply a signal representing the sign of the current; current-rectifying means, which, for each pole, supply a rectified signal proportional to the current circulating in said pole; and first numerical-processing means, which supply a value with sign representing a ground fault by means of a numerical-processing operation comprising the multiplication of the signal representing the sign by the corresponding rectified signal.

Electronic tripping device for low-voltage circuit breakers

An electric pole () for a low-voltage automatic power circuit breaker, comprising: a fixed contact () and a movable contact () that can be coupled/uncoupled with respect to each other, said fixed contact being electrically connected to a phase conductor, and a sensing unit that comprises a first section suitable to accommodate a current sensor associated with the phase conductor, the current sensor generating sensing signals that are indicative of the intensity of the electrical current that flows through the phase conductor, the sensing unit being electrically connected to a protection unit of the automatic power circuit breaker, the protection unit being suitable to receive the sensing signals and to generate control signals for actuation means operatively connected to said movable contact, and comprising at least one input section () provided with one or more electrical input terminals (); whose particularity consists of the fact that the sensing unit comprises a second section (), which is rigidly connected to the first section and is provided with one or more electrical output terminals that are electrically connected to the current sensor, the second section comprising connection means that are suitable to mechanically couple the second section to the input section of the protection unit, so as to provide a direct electrical connection between the electrical output terminals of the second section and the electrical input terminals of the input section.

Electric pole for low-voltage power circuit breaker

A supply device () for an electronic protection device to be used in a low-voltage circuit breaker. The supply device basically comprises a primary conductor (), a secondary winding (), a first magnetic circuit (), and at least one second magnetic circuit (). The first magnetic circuit () is such as to surround said primary conductor (), which is related to a phase protected by the protection device; at the same time, the first magnetic circuit () constitutes the core of said secondary winding () that is used for supply of the protection device. The second magnetic circuit () is structurally separated from the first magnetic circuit (), but is operatively connected thereto for subtracting part of the first magnetic flux generated within it by the current circulating in the primary conductor ().

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Dalmine, Italy

Severino Colombo