Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1991-03-08
1992-09-29
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335195, 202144R, 202147R, H01H 7500
Patent
active
051516748
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a power circuit breaker according to the preamble of claim 1. Such a power circuit breaker has the object to shorten the interruption of current in case of a circuit-breaking caused by a short circuit or by an overload of the line, and to limit the current to a minimum in case of a short circuit, such that the line to be protected does not become damaged in case of a failure. Such power circuit breakers are produced today in large quantities and in part fully-automatic. Decisive for an economic success of such a production line product is the number of required individual parts necessary for the functioning of the power circuit breaker as well as the ease of assembly of these individual parts. In particular, the adjustment expenditure for the calibration of the overcurrent trip, and the connections, performed as welds or soldering joints, of the individual components passed by the current delay the production procedure.
In the course of time, the reconstruction principle of single interruption has prevailed in the development of power circuit breakers. The movable parts, such as contacts, bimetals, etc., are connected with flexible copper strands in such arrangements in order to allow the current flow. The most advanced constructions use in such a case one single stranded wire, which connects the movable contact with the free end of the bimetal, such as taught, for example, in German Patent PS-2,504,954, German Patent PS-2,841,004, and German Patent DE-3,619,239. If the operating current is now fed over the bearing point of the movable contact, as proposed in German Patent DE-3,803,849, then it can occur in this strand-free construction that fluctuating press-on forces prevail in the bearing point because of the current forces acting on the movable contact, which favor welding of the two parts. This is undesirable.
Consequently, it is an object of the invention to produce a strong, current-limiting power circuit breaker of the kind initially recited, where any strand connection can be dispensed with, and which requires only two welds or soldering joints and does not require any adjustment expenditures.
This object is achieved according to the invention by the characterizing the features of the claims.
It is achieved in an advantageous way with this arrangement that a strong, current-limiting power circuit breaker can be fully mechanically mounted with a minimum of individual parts, without interfering connection strands, and without additional adjustment expenditures. In this case, the current feed is used in the contact region, in addition to the press-on force of the contact spring, to press the movable contact into its bearing position on the sliding rail. In this way, a safe contact-making is achieved also in case of large operating currents or overcurrents. A welding of the movable contact in its current-passing bearing position is safely avoided. The current passage in the contact region is used also based on its U-shaped course, to drive the arc, generated upon switching off, by way of a blow-out effect quickly away from the contact zone into the arc-quenching and arc-extinguishing chamber. On the other hand, based on the opposite current direction, the current guiding in the arc deflector and in the movable contact is used to deflect and to throw the movable contact away from the arc deflector guide sheet and from the solid contact independent of the magnet release in case of a short circuit. The arm distance of the U-shaped blow-out loupe is retained during the switching-off such that, in contrast to conventional constructions, the arc drive does not decrease. At the same time, the counter torque of the contact spring becomes smaller based on the rotation of the movable contact. These steps lead together to a very quick course of the arc from the contact position in case of a simultaneously assured press-on pressure of the movable contact in its bearing position effect, such that a welding is avoided. Based on the elimination of the flexible connection strands, the mass of
REFERENCES:
patent: 4001743 (1977-01-01), Arnhold
patent: 4636760 (1987-01-01), Lee
patent: 4725799 (1988-02-01), Bratkowski et al.
Donovan Lincoln
Heinrich Kopp GmbH & Co. KG
Kasper Horst M.
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