Branch circuit emergency lighting transfer switch utilizing relay controls and safety relay for load power control
US12015305B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2020 |
| Grant date | Jun 18, 2024 |
| Priority date | — |
| Expiry date | Mar 13, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/105
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device, system and method for sequenced switching of a transfer switch. The method includes receiving a first monitoring signal indicating either one of an actuation of a fire alarm system or a first change of state in a primary power source from an on state to an off state. The method includes opening a first control relay connected to the primary power source and a second control relay connected to the secondary power source. The method further includes switching a safety relay from a first connection to the primary power source to a second connection to the secondary power source. The method further includes closing the first and second control relays so that the secondary power source energizes the lighting load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.