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Power Adapters & Supplies

A power supply converts mains AC into the low-voltage DC that cameras, access control, alarms and LED lighting run on, and a power adapter does the same from a plug-in unit. This collection covers boxed PSUs with battery backup, DIN-rail and waterproof LED drivers, plug-in adapters, PoE injectors, inverters and USB chargers, from Dantech, Haydon, Elmdene, LYYT, Mercury, Axis and others, plus DMP ES501 and ES502 metal enclosures that protect a plug-in transformer.

Choosing Power Adapters & Supplies

Power supplies turn mains into the low-voltage DC that equipment needs; those here include 12V and 13.8V supplies for CCTV and security systems, some charging a standby battery, LED power adaptors and USB chargers. Choose a power supply by the voltage and current the equipment needs, where the supply will be mounted, and whether it must keep running in a power cut.

Voltage and current

Security equipment commonly runs on 12V DC, often from a 13.8V supply that also charges a standby battery, while LED tape and some intercom and camera systems run on 24V. Add up the current every device draws and choose a supply rated above it, such as the Haydon HAY-PSU12V5ABBL at 12V 5A.

Battery backup

Boxed PSUs with battery backup keep alarms, access control and cameras running through a mains failure. Most Haydon boxed supplies state a tamper switch, and the HAY-DC24V3ABBLPSU adds a mains-fail relay that signals the outage to a panel.

Mounting and environment

DIN-rail supplies, such as the AMG Systems AMGPSU-T48-P60 and Elmdene G13805NU, fit a control cabinet, and Dantech rack-mount supplies, such as the DA469/16, fit an equipment rack. LYYT 153.7 series IP67 waterproof supplies from 30W to 300W power LED tape outdoors, and the Haydon HAY-IP-24VPSU-1X4A is an IP66 24 VAC supply for outdoor CCTV.

TypeExampleOutput
Boxed PSU, battery backupHAY-PSU12V5ABBL13.8V, 5A
Switch-mode PSU, metal boxCDVI PSMB12512 V DC, 5 A
Waterproof LED supplyLYYT 153.764UK24Vdc, 300W, IP67
PoE injectorRG-POE-50-60W-MG56 V, 60 W
InverterMercury 652.006UK12V DC to 230V AC, 1000W

Plug-in adapters, chargers and inverters

Plug-in adapters from Dahua, Hanwha Vision and Knightsbridge power single cameras and LED loads, and PoE injectors from Ruijie send power down a network cable. Mercury soft start modified sine wave inverters run 230V equipment from a 12V or 24V battery, and Mercury USB chargers include 45W and 65W GaN models.

Brands we stock in Power Adapters & Supplies

Acre, Ajax, Altronix, AMG Systems, Aritech, Axis Communications, Bosch, Bose Professional, BTicino by Legrand, C-TEC, CDVI, Chord, Comelit PAC, Comnet, CQR, Dahua Technology, Dantech Electronic Engineering, DMP, Dynamic, Eaton, Elmdene, GJD, Hanwha Vision, Haydon, Hikvision, Honeywell Commercial Security, Hoyles, JCI Visonic, Kentec Electronics, Knightsbridge, Luminite, LYYT, Mercury, Nitek, NVT Phybridge, Optex, Pyronix, Raytec, RGL Electronics, Ruijie, Signet, STP, Teledyne FLIR, Texecom, TOA, TRENDnet, Ubiquiti, Uniti Power, Veracity, Verint and Videx.

Related categories

Shop by type: AC/DC power adapters, DC power supplies and power supply accessories. See the wider batteries and power supplies range, or our Help & Support guides.

Frequently asked questions

What is a universal power supply?

A universal power supply is an adapter that accepts a wide range of mains input voltages, so the same unit can work on different supply systems around the world. Some also come with interchangeable plug heads or output tips. Check that the output voltage, current and connector match the device before connecting it. The range here includes universal and wide-input power supplies.

What is a plug-in power supply?

A plug-in power supply is a compact adapter that plugs straight into a mains socket and converts mains voltage to a low DC output for a single device. It is often used for cameras, routers and intercom stations. For several devices or permanent wiring, a boxed or DIN rail unit is usually the better choice.

What size power supply do I need?

Choose a power supply with the right output voltage, then add up the current the connected devices draw at their peak. Include extras such as infrared lighting on cameras or lock release current. Allow headroom of around a quarter above that total so the supply does not run at its limit. For battery backup, allow extra current for charging the battery.

How do you test a power supply?

To test a power supply, measure its output with a multimeter set to DC volts, first with no load and then with the devices connected. The reading should stay close to the rated voltage under load. A low or unstable reading, a hot case or a blown fuse points to a fault. Isolate the mains before opening a boxed unit.

What is a power supply?

A power supply is a device that converts mains electricity into the steady voltage and current that equipment needs, usually a low-voltage DC output. It is used for CCTV, access control, alarms, intercoms and network equipment. The range here includes plug-in adapters, boxed units with battery backup and DIN rail modules.

  • Established 1975
  • Birmingham trade counter
  • UK-only supply

Written by the West Midlands Electrics technical team

Updated

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