A transistor protects the integrated circuit against {HEAD ~ a surge voltage} from {TAIL ~ a battery terminal} 
from
A transistor protects the integrated circuit against { HEAD ~ a surge voltage } from { TAIL ~ a battery terminal }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL