{HEAD ~ an OR gate} for receiving {TAIL ~ the power supply interrupting signal} and the breaker opening command, and for producing an output signal indicating that the breaker is to be opened when either one of the power supply interrupting signal and the breaker opening command is received; and 
for receiving
{ HEAD ~ an OR gate } for receiving { TAIL ~ the power supply interrupting signal } and the breaker opening command , and for producing an output signal indicating that the breaker is to be opened when either one of the power supply interrupting signal and the breaker opening command is received ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH