High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Magnetic blowout
Patent
1998-11-10
2000-08-08
Donovan, Lincoln
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Magnetic blowout
218 36, 335 16, 200284, H01H 3318, H01H 944
Patent
active
061004901
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a low-voltage circuit breaker with an enclosure having a rear wall and a front part and a switching contact system arranged in the enclosure. The low-voltage circuit breaker has two approximately parallel connecting bars that connect the switching contact system with an external circuit. The connecting bars extend through the window openings in the rear wall and are secured in the enclosure using a fastening means. One of the connecting bars serves as a support of a stationary switching contact and an arcing horn. The other connecting bar is connected through an articulated conductor arrangement to a movable switching contact of the switching contact system.
BACKGROUND INFORMATION
A circuit breaker is described in German Patent No. 44 16 105. In this circuit breaker, screws extending through openings made transversally to the longitudinal axis of the connecting bars are used as the fastening means for the connecting bars, with corresponding female threads provided in the rear wall of the enclosure to accommodate these screws. Since the rear wall of the enclosure is a molded body made of insulating material, usually insert nuts or pressed-in nuts are used for providing the female thread.
In circuit breakers of this type, for high-intensity current that may range between 1000 A and 6000 A, the connecting bars have a considerable cross section. Accordingly, the connecting bars are provided with a plurality of cross bores as needed and a corresponding number of fastener means is required. Therefore, a non-negligible cost for machining the connecting bars is incurred to incorporate connecting bars in such a circuit breaker.
The present invention differs from a circuit breaker described in U.S. Pat. No. 3,287,534, whose main circuit path, in addition to internal main conductors, has external connecting bars detachably connected to the main conductors. These connecting bars have webs extending transversally in their longitudinal direction, which are not used for positioning the main current path as a whole and supporting it in the circuit breaker enclosure. Rather, the webs, designed as rectangular flanges with fastening orifices, provide the user with the option of mounting the connecting bar in two positions 90.degree. apart to match the different possible positions of the downstream connecting bars in a switching system. This arrangement requires separate fastening of the internal main conductor, designed as the support of a stationary switching contact and of an articulated conductor arrangement, in the circuit breaker enclosure. The connecting bars are in turn connected to the main conductors using additional fastening elements. In order to allow the connecting bars to be mounted in a different position, the internal main conductors have a clamping surface, accessible via a window in the rear wall of the circuit breaker enclosure. Thus, in order to make the circuit breaker variably connectable, no effort was made to seek a method of mounting the main current path using the fewest possible fastening elements and the fewest possible machining steps for the components of the main current path.
SUMMARY OF THE INVENTION
An object of the present invention, is to simplify the incorporation of connecting bars.
According to the present invention, this object is achieved by the fact that both connecting bars have a web extending transversally to their longitudinal axis. The rear wall of the enclosure has a mating face as a stop for each of the webs, so that each connecting bar may be introduced in the respective window opening of the rear wall from the side facing the switching contact system until the web contacts the mating surface. The fastening means for keeping the webs in contact with the respective mating surface is designed to act in the longitudinal direction of the connecting bar.
The web provided according to the present invention allows the connecting bars to be supported by the rear wall of the enclosure by their surfaces. The transversal bore
REFERENCES:
patent: 3287534 (1966-11-01), Cellerini et al.
patent: 4277664 (1981-07-01), Maier et al.
patent: 4636762 (1987-01-01), Marquardt et al.
patent: 5634552 (1997-06-01), Soberski
Donovan Lincoln
Siemens Aktiengesellschaft
LandOfFree
Circuit breaker for low tension with connecting bars does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit breaker for low tension with connecting bars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit breaker for low tension with connecting bars will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1152157