Contact sequencing arrangement for rotary double break switch
US4614851A · kind A · utility
1Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1985 |
| Grant date | Sep 30, 1986 |
| Priority date | — |
| Expiry date | Feb 21, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H9/563
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Stationary contacts (12) of a multi-pole disconnect or safety switch are arranged to be engaged by one of a rotatably movable bridging contact (2) before engagement of the other end thereof with a second set of stationary contacts (10). Stationary contacts (12) of adjacent switch poles are positioned on alternate ends for increasing the phase-to-phase failure distance, and one stationary contact (10a) may be arranged to close one or two milliseconds late to produce single phasing for a short time under fault current conditions during which time current limiting fuses (14) begin to open the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.