In the particular embodiments described in the specification {HEAD ~ a device} is provided to protect against failure of a switch connected to a load and to give {TAIL ~ an alarm} that the switch has failed 
is provided to give
In the particular embodiments described in the specification { HEAD ~ a device } is provided to protect against failure of a switch connected to a load and to give { TAIL ~ an alarm } that the switch has failed
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH