RACK MOUNT DC POWER SUPPLIES supply regulated and filtered main, standby or auxiliary power to CCTV, access control, fire and security system components. 8 zone models are user selectable for 12 VDC or 24 VDC. 16 zone models have two independent power supplies and feature 12/24 VDC selectability by zone to power both 12 VDC and 24 VDC devices in any combination. Individual zone LEDs on the cabinet face provide at-a-glance zone by zone monitoring.