Safety switching device for safely switching off an electrical load
US6809911B2 · kind B2 · utility
5Cited by
7References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2003 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Jan 31, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H47/005
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a safety switching device for safely switching off an electrical load such as an electrically driven machine. The safety switching device has a failsafe disconnection unit and a non-failsafe signaling unit, both of which are supplied with an external control signal. The disconnection unit fail-safely switches off the electrical load as a function of the control signal but with a first delay. The signaling unit produces an external reporting signal as a function of the control signal in a non-delayed and non-failsafe manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.