Patent · US Expired

Low-voltage circuit breaker with means for limiting contact lifting

US4273979A · kind A · utility

4Cited by

4References

1Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Klaus-Gunther Berndt · Berlin, DE
Manfred Kruger · Büdingen, DE
Wolfgang Nawrot · Berlin, DE

Key dates

Filing date	Apr 11, 1979
Grant date	Jun 16, 1981
Priority date	—
Expiry date	Apr 11, 1999

Classification

Technology area (CPC H)Electricity
CPC primaryH01H71/504
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A low-voltage circuit breaker has a fixed contact and a movable contact which is attached to a pivoted contact carrier. Between the contact carrier and the movable contact, a contact pressure spring is arranged, which is designed as a coil compression spring. The contact carrier has an arm which extends to the vicinity of the contact-making end of the movable contact. The arm carries a setscrew which is positioned to act centrally with respect to a contact overlay of the movable contact. The setscrew limits the lifting of the movable contact or the contact overlay to the desired small extent, when a large current flows through the circuit breaker and exerts electrodynamic force on the movable contact.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.