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