Improved calibration means for a circuit breaker
US5821839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Aug 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2071/084
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit breaker device for interrupting current in a circuit path between a source and a load includes a first contact and a second contact cooperatively arranged in the circuit path so as to provide current from a source to a load. A trip mechanism assembly, which includes an armature, a bimetal and a yoke, is provided for interrupting the current. The armature includes an aperture in which a latch point is provided to engage a latching surface of a trip lever for latching the trip lever thereon. The amount of current that is required to cause the trip mechanism to interrupt the circuit path is determined by the amount of overlap between the latching surface and the latch point. This overlap is adjusted by bending a calibration plate by tightening a calibration screw which extends through an aperture in a circuit breaker housing and a slotted aperture in the calibration plate. A substantially square shaped nut secures the calibration screw tightly against the housing. The calibration plate includes a leg portion bent substantially perpendicular thereto which has a rounded end supported in a v-block formed in the housing. The rounded end provides a pivot for which the calibration…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.