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