{TAIL ~ a protective relay} for producing a breaker opening command when a fault occurs on a load side of {HEAD ~ the breaker} 
{ TAIL ~ a protective relay } for producing a breaker opening command when a fault occurs on a load side of { HEAD ~ the breaker }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD