The PS480B power supplies input 110-120VAC and deliver (4) amps @ 24VDC to 8 PTC fused outputs. It also provides 8 solid-state input triggers, protects system relays from shorts, grounds and surges. Its linear design makes it a perfect match for solenoid & motor driven exit devices, electric locks, electric strikes, and mag locks. Includes battery charging circuit. Batteries sold separately.