... fire panel, fire alarm controller, fire alarm control unitFeatures1) 4/8/16 Style B (Class B) Initiating Device Circuits (IDCs). ... power7) Alarm, Trouble and Supervisory, Form-C relays standard.8) 24-volt operation9) Resettable four-wire smoke detector power @ ... acid batteries only, Maximum charging circuit: 27.6VDC @ 0.8 amp for normal flat charge, Maximum battery charger capacity: 18AH battery ...