And don't forget a remote alarm for the battery charger. I worked on the replacement of a 5kV motor starter that blew up because a mouse got across the phases, but the batteries that supplied the trip voltage were dead. It took out two of the 34.5 kV primary fuses on the utility line that fed the plant substation. Had the batteries been able to supply the required current the feeder breaker that fed the 5 kV starter would have opened limiting the damage and keeping the rest of the plant online.
"It is the first responsibility of every citizen to question authority." B Franklin