Klockner-Moeller

Franz Boder

Bernd Howald

Christoph Bausch

An electrical switch is intended to prevent hot arc gases from contacting the terminal screw units. The arc gases are to flow off in an already deionized manner so that no damage is caused even when they flow out towards the electric cable terminals without the need for additional shielding for the terminals. A terminal cover section is designed with blow-out channels which are fully encapsulated with respect to the terminal screws and to the terminal chambers and have an outlet aperture each. To fully encapsulate and provide access to each of the terminal screws, a location dome passes through each blow-out channel. At the points where the through apertures join the quench chambers, the inserted terminal cover section is sealed against the separating wall of the housing in the region of the blow-out channel inlet apertures. The arc gases flow from arc quenching chambers through a partition by way of passage openings. The passage openings open into the blow-out channels, which blow-out channels are wider than the passage openings. Then the arc gases flow through a portion of the blow-out channels narrowed by the presence of the location domes passing through the blow-out channels. As the arc gases pass beyond the location domes, the blow-out channels widen as a result of the absence of the location domes.

Electrical switching device with blow-out channels for arc gases

A contact system for current limiting units which are combined with power circuit breakers or motor circuit breakers. The object of the invention is to improve the reliability of the current limiting unit equipped with such a contact system, while reducing the time and effort required to assemble and install such a contact system. The invention teaches that the contact systems can be assembled from a contact carrier with a stationary contact tip and a subsystem preassembled with little force, which can be installed in the arcing chambers in a stable condition and under the force of contact compression springs. The subsystem contains the wiper provided with the moving contact tip, which wiper is mounted with a direct electrical connection to a supply lead. Supports in the subsystem limit the movement of the wiper in both directions. A support block provided with a holding groove and auxiliary groove for the non-positive assembly of the parts connected to the contact compression springs makes it possible to preassemble the subsystem by means of an intermediate state which is also stable.

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Munich, Georgia

Franz Boder