Patent · US Active

Circuit breaker thermal-magnetic trip units and methods

US9230768B2 · kind B2 · utility

0Cited by

35References

30Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Stephen Scott Thomas · Atlanta, US
Esteban Sandoval Camacho · San Mateo del Mar, MX

Key dates

Filing date	Feb 28, 2012
Grant date	Jan 5, 2016
Priority date	—
Expiry date	Feb 28, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH01H2071/124
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A trip unit is provided for a circuit breaker that includes electrical contacts, a trip mechanism, a bimetallic strip, and an armature. The trip unit includes a first trip bar coupled to the trip mechanism and disposed about a pivot point, and a second trip bar coupled to the first trip bar and disposed about the pivot point. In a first operating condition, the first trip bar rotates about the pivot point substantially independently of the second trip bar, and activates the trip mechanism to open the electrical contacts. In a second operating condition, the second trip bar rotates about the pivot point, causing the first trip bar to rotate about the pivot point and activate the trip mechanism to open the electrical contacts. Numerous other aspects are provided.

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