Thermal-magnetic trip unit with adjustable magnetic tripping
US6255925A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2000 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Feb 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2071/7481
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An adjustable thermal-magnetic trip unit for a molded case circuit breaker 10 is disclosed, with the circuit breaker 10 including a housing 12 having an operating mechanism 40 including an intermediate latch 52, a line terminal 18, a load terminal 16 and a cover 20. The adjustable thermal-magnetic trip unit includes a magnetic yoke 66 mounted in the housing 12, and a bimetal member mounted in the magnetic yoke 66, with the bimetal member having a fixed end and a movable end. The fixed end is coupled to a load bus 61 of the load terminal 16, and the movable end is coupled to a movable contact of the operating mechanism 40. The trip unit 610 also includes a horizontal trip bar rotatably mounted in the housing 12, with the trip bar 54 having an actuating arm gapped from the movable end of the bimetal member and with the actuating arm aligned to selectively engage the movable end of the bimetal member. The trip unit 610 also includes a latch pawl mounted on the trip bar 54 and having an inclined latching surface aligned with and engaging an inclined latch surface of the intermediate latch; and an adjustment knob associated with the trip bar, wherein rotation of the adjustment knob move…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.