Altronix® POWER SUPPLY/CHARGERS convert a 115 VAC, 60 Hz input into a single fused output. Key features include AC fail supervision (form “C” contacts), low battery supervision (form “C” contacts), battery presence supervision (form “C” contacts), built-in charger for sealed lead acid or gel-type batteries, and automatic switch over to stand-by batteries (when AC fails). UL listed. NYC Department of Buildings (MEA) and California State Fire Marshal (CSFM) approved.