{TAIL ~ means} for opening the breaker in response to {HEAD ~ the output signal} of the OR gate, thereby opening the breaker in response to either one of the power supply interrupting signal and the breaker opening command 
{ TAIL ~ means } for opening the breaker in response to { HEAD ~ the output signal } of the OR gate , thereby opening the breaker in response to either one of the power supply interrupting signal and the breaker opening command
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH