a relay having a coil connected to the collection terminal of the transistor and {HEAD ~ a switch} connected between {TAIL ~ the power output terminal} and the power output socket 
connected between
a relay having a coil connected to the collection terminal of the transistor and { HEAD ~ a switch } connected between { TAIL ~ the power output terminal } and the power output socket
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH