Small-sized industrial rated electric motor starter switch unit
US6710988B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1999 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Aug 17, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H1/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A molded case electric switch housing includes an electric switch control circuit for motor overload and phase loss conditions, a motor contactor control circuit for turning an associated electric motor ON and OFF and a replaceable fuse unit for handling short-circuit type faults. Upon the occurrence of a short circuit within the protected circuit, the fuse rapidly interrupts the short circuit to protect the electric circuit. The fuse is replaced before power is restored to the protected circuit. The arrangement of the electric switch control circuit, motor contactor control circuit and fuse allows single sized switch current-carrying components to be used over a wide range of motor ratings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.