Patent · US Active

Circuit arrangement for limiting a voltage

US8649145B2 · kind B2 · utility

1Cited by

4References

16Claims

0Family size

Assignee

R. STAHL SCHALTGERÄTE GMBH · DE

Inventors

Fritz Frey · Künzelsau, DE
Manfred Kaiser · Karben, DE

Key dates

Filing date	Mar 12, 2008
Grant date	Feb 11, 2014
Priority date	—
Expiry date	Sep 27, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH02H9/025
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit arrangement for enforcing an intrinsically safe situation in a hazardous zone features a first switching device that lies in the series arm and a second switching device that lies in the shunt arm. If a fault occurs that would violate the conditions of intrinsic safety, the first switching device is initially blocked and the second switching device is switched through with a time delay such that the output terminals are mutually short-circuited. In addition, a monitoring device is provided for monitoring the load conditions at the switching device arranged in the series arm.

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