Disclosed is an electrical control circuit for controlling {HEAD ~ current} through {TAIL ~ a furnace coil} or other resistive load  
through
Disclosed is an electrical control circuit for controlling { HEAD ~ current } through { TAIL ~ a furnace coil } or other resistive load
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH