Low-voltage circuit breaker device

Abstract

Disclosed is a low-voltage circuit breaker device (1) comprising an external conductor section (2) and a neutral conductor section (5), wherein a mechanical bypass switch (8) is arranged in the external conductor section (2), a first semiconductor circuit arrangement (11) of the low-voltage circuit breaker device (1) is connected in parallel to the bypass switch (8), and a current measuring arrangement (12) is arranged in the external conductor section (2) and is connected to an electronic control unit (13) of the low-voltage circuit breaker device (1), wherein the electronic control unit (13)is designed to actuate the bypass switch (8) and the first semiconductor circuit arrangement (11) when a given overcurrent, in particular a short-circuit current, is detected by the current measuringarrangement (12). According to the invention, the bypass switch (8) is in the form of a multiple-breaking switch (27), and in the external conductor section (2), a second semiconductor circuit arrangement (14) is connected in series to the bypass switch (8) and in parallel to the first semiconductor circuit arrangement (11).

Description

technical field [0001] The invention relates to a low-voltage circuit breaker arrangement according to the preamble of claim 1 . Background technique [0002] A corresponding circuit breaker arrangement is known from WO 2015 / 028634 A1 of the applicant. Such circuit breaker devices operate according to zero voltage switching. The bypass switch opens only when the circuit breaker device is closed, an arc is generated, and the current is commutated to the semiconductor circuit device. [0003] This has the disadvantage that a load is always applied to the contacts of the bypass switch, which wear out with each switching operation. Furthermore, since the current at the transition from the bypass switch to the semiconductor circuit arrangement is already very high in the event of an increased short-circuit current and the semiconductor circuit arrangement is suddenly loaded with this high current, the semiconductor circuit arrangement is severely stressed. As a result, critica...

AI Technical Summary

Problems solved by technology

[0003] This has the disadvantage that the load is always applied to the contacts of the bypass switch, which wears out with each switching operation

Furthermore, since the current at the transition from the bypass switch to the semiconductor circuit arrangement is already very high in the event of an increased short-circuit current and the semiconductor circuit arrangement is suddenly loaded with this high current, the semiconductor circuit arrangement is severely stressed

As a result, critical components of the circuit breaker unit are subjected to very high loads every time they are switched off, especially when switching short-circuit currents for safety reasons, which reduces the service life of the circuit breaker unit

Images