Use RGS250-4D8Z/E where an access-control installation requires centralized rack-mounted power, distributed fused outputs, and battery-backed operation. The RGS250 platform supplies 250 W total output and provides 32 auxiliary outputs through four D8 sections, with dual-bus voltage selection by zone. Fire-alarm disconnect can unlock doors during an alarm condition, while low-battery cutoff helps prevent deep battery discharge. AC Fault and System Fault Form C contacts report conditions including power-supply failure, blown fuse, low or missing battery, and short to earth ground. The enclosure mounts one Software House ACM or one GCM and includes a Z-bracket.