The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 12, 1995
Filed:
Apr. 21, 1994
Francesco Perdoncin, Villa de Serio, IT;
ABB SACE SpA, Bergamo, IT;
Abstract
The low-voltage switch includes a stationary contact (2) and a moving contact (3). The two contacts and an arc splitter stack (6) are arranged in an arc quenching chamber (5). An elongation element (14) is fitted on the stationary contact (2), extends in the direction of the arc splitter stack (6) and is used for accommodating an arc root. A section, which is constructed in the form of a plate, of a power supply lead of the stationary contact (2) is widened in a U-shape. The two limbs (11) of the U are bridged by a yoke (12) at their free ends. A conductor element is fitted on the yoke (12), which conductor element is in the form of a plate, is formed by a contact tongue (13) of the stationary contact (2) and by an elongation element (14) fastened thereto, and is inclined in the direction of the arc splitter stack (6) with respect to the plate-shaped section of the power supply lead. Arranged in the arc quenching chamber (5) is an insulating element (15) which is provided with an opening (16), shields the plate-shaped section of the power supply lead of the stationary contact (2) with respect to the arc quenching chamber (5) and through whose opening (16) the plate-shaped conductor element is passed. This switch is distinguished by low contact erosion and low wear of the arc quenching chamber (5), while having a high switching power. This is dependent on the fact that quenching gas which emerges from the insulating part under the influence of an arc flows deliberately in the direction of the arc splitter stack (6), and that the root of the switching arc, which root originates on the stationary contact (2), is guided particularly rapidly into the arc splitter stack by this gas flow and by the force of the magnetic field of the current which is to be disconnected.