Safety switching device for connection and safe disconnection of an electrical load, in particular an electrically driven machine
US6570272B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 2002 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | May 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/004
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a safety switching device for connecting and safely disconnecting an electrical load, in particular an electrically driven machine. The safety switching device includes first and second electromechanical switching elements whose operating contacts are arranged in series with one another between a first input terminal and an output terminal of the switching device. Furthermore, the switching device has a second input terminal for receiving a switching signal. The switching signal acts on the switch position of the operating contacts of the two switching elements. According to a preferred embodiment, the first switching element has a lower nominal switching capacity than the second switching element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.