Low Voltage Circuit Breaker Equipment

Abstract

The invention relates to a low-voltage protection switchgear (1), comprising a power supply terminal (3) of an outer conductor of the low-voltage protection switchgear (1) to an outer-conductor load terminal (4) of the low-voltage protection switchgear (1). at least one outer conductor path (2) and a neutral conductor path from the neutral conductor terminal (6) of the low voltage protective switchgear (1) to the neutral conductor load terminal (7) of the low voltage protective switchgear (1) (5), a mechanical bypass switch (8) arranged in the outer conductor path (2), the first semiconductor circuit arrangement (11) of the low-voltage protective switchgear (1) connected in parallel to the bypass switch (8), located in A current measuring device (12) in the outer conductor path (2) and connected to an electronic control unit (13) of the protective switchgear (1), the electronic control unit (13) being designed to detect by means of the current measuring device (12) The bypass switch ( 8 ) and the first semiconductor circuit arrangement ( 11 ) are activated in the event of a predeterminable overcurrent, in particular a short-circuit current. According to the invention, the first mechanical disconnect switch (9) is arranged in series with the first semiconductor circuit arrangement (11) and in parallel with the bypass switch (8).

Description

technical field [0001] The invention relates to an undervoltage protective switching device according to the preamble of claim 1 . Background technique [0002] A similar protective switchgear is known from WO 2015 / 028634 A1 from the applicant. When the protective switching device is switched off, the bypass switch is first opened, an arc is generated, and the current is commutated to the semiconductor circuit arrangement. Subsequently, the previously switched-on semiconductor circuit arrangement is switched off and the disconnecting contact connected in series to the bypass switch for providing galvanic blocking is opened. [0003] These disconnect contacts are necessary in order to prevent current leakage via the semiconductor circuit arrangement in the off state. During the switching operation, these disconnect contacts lead to a considerable resistance of the switching device involved and correspondingly to a higher power loss and internal heating of the switching devi...

AI Technical Summary

Problems solved by technology

With the aid of these resistors, the nominal current of such switching devices is limited or this leads to an increase in the size of the structure when high nominal currents are required

Since the current flows continuously through the contacts involved, these must also have a correspondingly high-quality design, wherein however resistance cannot be avoided here

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