Solid - state trip unit for dc circuit breakers

Details Solid - state trip unit for dc circuit breakers Solid - state trip unit for dc circuit breakers

H - Electricity

02

H

348/26

H02H 3/087 (2006.01) H02H 1/00 (2006.01) H02H 1/06 (2006.01)

Patent

CA 2019892

55, 183 ABSTRACT OF THE DISCLOSURE A contactor includes two DC sensors within the housing which are isolated from the tripping unit, from the power supply and from each other by the combination of a transformer and photoelectric coupling, the sensed signals being pulse width modulated and demodulated on the respective sides of the photoelectric coupling barrier.

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