The right power supply stops faults before they start.
An undersized PSU (power supply unit) is a common cause of faults that look like a camera, panel or lock problem but are really a voltage problem. Choosing the right unit means matching the current (amps), not just the voltage, to what it powers.
How do I size a power supply?
Sizing a power supply
- Add up the current draw of everything on the supply, then add at least 20% headroom. Running a PSU at its maximum shortens its life and leaves nothing to charge a standby battery.
- Match the voltage exactly. Most CCTV cameras run on 12V DC. Most alarm panels and access control kit run on 12V DC, or sometimes 24V AC. Check the device before ordering.
- Boxed or plug-in. A boxed PSU with a standby battery keeps a panel, lock or PoE switch running through a power cut. It's standard on commercial access control and alarm installs. A plug-in adapter is fine for a single low-draw device that doesn't need backup.
Where are these used?
PSUs here cover intruder alarm panels and expanders, access control locks and controllers, and CCTV camera and PoE equipment power. If you know which system you're powering, the linked category has supplies matched to that equipment, plus the cable to go with it.
Need help sizing a PSU? Call us on 01902 902251. We deliver to England, Scotland and Wales within 1–2 working days.
Power Supplies
The right power supply stops faults before they start.
An undersized PSU (power supply unit) is a common cause of faults that look like a camera, panel or lock problem but are really a voltage problem. Choosing the right unit means matching the current (amps), not just the voltage, to what it powers.
How do I size a power supply?
Sizing a power supply
- Add up the current draw of everything on the supply, then add at least 20% headroom. Running a PSU at its maximum shortens its life and leaves nothing to charge a standby battery.
- Match the voltage exactly. Most CCTV cameras run on 12V DC. Most alarm panels and access control kit run on 12V DC, or sometimes 24V AC. Check the device before ordering.
- Boxed or plug-in. A boxed PSU with a standby battery keeps a panel, lock or PoE switch running through a power cut. It's standard on commercial access control and alarm installs. A plug-in adapter is fine for a single low-draw device that doesn't need backup.
Where are these used?
PSUs here cover intruder alarm panels and expanders, access control locks and controllers, and CCTV camera and PoE equipment power. If you know which system you're powering, the linked category has supplies matched to that equipment, plus the cable to go with it.
Need help sizing a PSU? Call us on 01902 902251. We deliver to England, Scotland and Wales within 1–2 working days.
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