Short-circuiting device for use in low-voltage and medium-voltage systems for the protection of property and persons

US11145477B2 · kind B2 · utility

Assignee

• DEHN SE + CO KG · DE

Inventors

• Arnd Ehrhardt · Dresden, DE
• Klaus Bühler · Endingen am Kaiserstuhl, DE

Key dates

• Filing date: Dec 3, 2018
• Grant date: Oct 12, 2021
• Expiry date: Dec 3, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01H39/00
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

The invention relates to a short-circuiting device for use in low-voltage and medium-voltage systems for the protection of property and persons, comprising: a switching element, which can be operated by the tripping signal of a fault detection device; two mutually opposite contact electrodes having power supply means, which contact electrodes can be brought into contact with an electrical circuit having connection points at different potential; furthermore, in at least one of the contact electrodes, a movable contact part, which is under mechanical preload and executes a movement to the further contact electrode with the assistance of spring force in the event of a short circuit; and a sacrificial element as a spacer between the contact electrodes, with an electrical connection between the sacrificial element and the switching element on the one hand and one of the contact electrodes on the other hand, in order to deliberately cause current-flow-induced thermal deformation or destruction of the sacrificial element. According to the invention, the movable contact part is in the form of a hollow cylinder which is closed on one side, and a spring for generating preload is inserted in …