Molded case circuit breaker having improved trip unit
US5258733A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Aug 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2071/7481
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Molded case circuit breaker having collapsible toggle linkage with rectangular cross section knee pin non-rotatably held within open rectangular slots in upper link, bifurcated movable contact fingers loosely guided for pivotal movement about fixed pin to break contact welds, helical compression springs biasing bifurcations against faces of a stationary connector, trapezoidal cross section shaft biasing shaft against a fixed corner of clamping strap and frame, increasing clamping force and increasing tool clearance, operating handle which changes pivot point moving to RESET position, reducing lateral force component of operating springs for reliable return of handle to OFF position, dual stops for movable contact fingers to spread impact forces along fingers, greater contact separation in poles not containing operating mechanism, slot motor laminations providing metal reinforcement to separate arc chamber housing which is cooperatively interlocked with base to distribute structural strength, terminal cover with arc vent extension angled downwardly, extended lug cover with second arc vent extension interlocked to terminal cover and arc chamber housing for no-fastener securement, tri…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.