Patent · US Expired

Method and arrangement for calibration of circuit breaker thermal trip unit

US6218917A · kind A · utility

5Cited by

173References

16Claims

0Family size

Assignee

General Electric Company · US

Inventors

Joseph Criniti · Meridian Avenue, US
Javier Larranaga · Bristol, US
Volkman Henschel · Nortorf, DE
Manfred Schulz · Jeffery Road, DE
Walter Felden · Neumünster, DE

Key dates

Filing date	Jul 2, 1999
Grant date	Apr 17, 2001
Priority date	—
Expiry date	Jul 2, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH01H2069/013
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A thermal trip unit within a multi-pole circuit breaker includes a bimetal element having an off-set end to provide cam function during the calibration of the bimetal element. A calibration screw is threadingly engaged within the bimetal element and is adjusted at various calibration levels by means of a step motor driver element.

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