US 5,811,749 AGranted

Electrical switching device with blow-out channels for arc gases

AssigneeKlockner-Moeller GmbH

InventorsChristoph Bausch, Franz Boder, Bernd Howald

Life of this patent

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Abstract

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.

Claims20

Dependent claims

An electrical switching device comprising:

a housing;
electrical switching components being disposed within said housing;
said housing comprising:
an arc quenching chamber to quench electrical arcs from said electrical switching components;
a terminal chamber to house electrical conductor connections;
a partition disposed between said arc quenching chamber and said terminal chamber;
said partition comprising a partition passage opening to discharge arc gases from said arc quenching chamber;
a terminal connecting unit to connect an electrical conductor to said electrical switching device;
said terminal connecting unit being disposed in said terminal chamber;
a terminal cover part to cover said terminal connecting unit;
said terminal cover part being a separate part from said housing;
and
said terminal cover part comprising:
a through-hole to permit access to said terminal connecting unit to permit connection of an electrical conductor to said electrical switching device;
a blow-out channel to direct the flow of arc gases through said terminal chamber;
said blow-out channel comprising an outlet opening, an inlet opening, and a channel passage disposed between said inlet opening and said outlet opening;
said channel passage comprising an arrangement for completely encapsulating said channel passage with respect to said terminal connecting unit and with respect to said terminal chamber;
an arrangement for disposing said inlet opening tightly up against said partition;
and
an arrangement for disposing said inlet opening around said partition passage opening.

17 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/734,628Filed 18 Oct 1996
Priority: DE 94 06 404 U20 Apr 1994
Granted: 22 Sep 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H01H 9/342
Stationary parts for restricting or subdividing the arc, e.g. barrier plate: venting arrangements for arc chutes
H01H 1/5855
Electric connections to or between contacts; Terminals: characterised by the use of a wire clamping screw or nut
H01H 9/0264
Bases, casings, or covers: protective covers for terminals
H01H 71/0228
Mounting or assembling the different parts of the circuit breaker: having provisions for interchangeable or replaceable parts