Patent ID: 7573153
Filing Date: 2009-08-11
Classification: H02J

Abstract:
1. An apparatus for supplying DC power to input terminals of at least one field device operating on AC power via a single AC power cable, comprising: a multi-pole main switch having an input side receiving an AC voltage from a power mains and an output side supplying a switched AC voltage to output terminals of the apparatus; an AC power cable connecting the output terminals to the at least one field device; a DC voltage supply device having an input side receiving the AC voltage from the power mains and a DC voltage output side; a two-pole switch switchably connecting the DC voltage output side to two wires of the AC power cable, wherein the multi-pole main switch and the two-pole switch are ganged so as to supply only one of the switched AC voltage and the DC voltage to the at least one field device over the AC power cable.