Electromagnetic switching apparatus, particularly motor contactor, with auxiliary contacts

US3942143A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Fritz Pollmann
• Wilhelm Holzer · Amberg, DE

Key dates

• Filing date: Feb 6, 1975
• Grant date: Mar 2, 1976
• Expiry date: Feb 6, 1995

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01H50/541
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A switching apparatus of the kind in which contact bridges held in a contact bridge carrier in tiers, one behind the other, as seen in the switching direction, can be brought into contact with fixed contact members fastened to a single housing part. In particular, with the number of the bridges in the individual tiers uneven in number, the walls of the housing, which form at least in part the arcing chambers for the contact points of the contact members, extend into slots of the contact bridge carrier to form labyrinths and, at least one of said walls extends over only one tier. Additionally, the contact points of the upper tier are arranged, preferably, in recesses of the contact bridge carrier. The present switching apparatus has the advantage that it permits accomodating in one molded housing, for instance, three main switch poles and four auxiliary switch poles.