DC Power Supplies

A DC power supply powers equipment that runs on low-voltage direct current, such as CCTV cameras, access control readers and locks, door entry panels and alarm devices. Some are wired to the mains and some plug in, and one supply can feed several devices from one point.

A 13.8V output can run 12V equipment and keep a standby battery charged at the same time. Supplies here with a 13.8V output include the RGL 1202SM-1, the Haydon HAY-PSU12V5ABBL and HAY-PSU12V2ABB and the Elmdene G13805NU. The Elmdene G13805NU gives 13.8V dc at 5A to load plus battery charging, and the Haydon HAY-PSU12V3ABB gives 12 V DC at 13.8 V nominal with battery backup.

A DIN-rail supply clips onto the standard rail inside a control cabinet or distribution enclosure, alongside other rail-mounted devices. AMG Systems AMGPSU units, the Comnet PS-A24060 and the Axis 5505-731 are DIN-rail supplies in this range, and the Comnet PS-MORD4860 mounts to standard 35 mm DIN rail.

Some can. IP66 supplies, such as the Haydon HAY-PSUIP1X2A-12VDC, are sealed against dust and water jets for exposed positions. The HAY-PSUIP1X2A-12VDC has a wide AC input and a regulated 12 V DC output rated to 2 A (24 W), and is designed for outdoor CCTV cameras, PTZ heads and gate controllers.

A fused output module, such as the Elmdene FOM-4 or FOM-8, splits one supply into four or eight separately fused outputs. A fault on one device then blows the fuse of that circuit, and the other cameras or readers on the supply keep running.

Several Dantech supplies accept mains voltage from as little as 90V to 270V at 47 to 63Hz, including the DA665/1 and DA665/2 and their IP66 versions. The DA665/1 gives a regulated 12VDC output, 4A in total, through one fused output, and the DA665/2 has two individually fused 12VDC 2A outputs. The DA665 units are intended for CCTV cameras and can be used in a range of security applications.

Yes. The Hikvision DRL-48V240W1EN and DRL-48V75W1AZ and the DS-KAW150-4N are 48V supplies, the DS-KAW150-4N rated 150W. Check that the supply's voltage matches the equipment's rating plate, and choose a wattage above the total load it will carry so the supply is not run at its limit.

Boxed supplies with battery backup, such as the Haydon HAY-PSU12V5ABBL at 13.8V 5A and the HAY-DC24V3ABBLPSU at 24V 3A, charge a standby battery and run from it when the mains fails. The HAY-DC24V3ABBLPSU adds a mains-fail relay and has short circuit and overload protection.