Apparatus for interrupting {HEAD ~ supply} of {TAIL ~ power} from power system to portion of consumer load in response to control signal from power system 
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Apparatus for interrupting { HEAD ~ supply } of { TAIL ~ power } from power system to portion of consumer load in response to control signal from power system
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH