fourth connecting means connecting {HEAD ~ the emitter} of {TAIL ~ the power} semi conductor to one of the terminal posts  
of
fourth connecting means connecting { HEAD ~ the emitter } of { TAIL ~ the power } semi conductor to one of the terminal posts
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH