Ein Ersatz-POS-Netzteil wählen: Spannung, Stromstärke, Stecker und Polarität (gleich beim ersten Mal richtig)

Replacing a POS power supply isn’t about wattage guesswork — it’s four specs read off a label. Match the voltage exactly, supply at least the rated amperage, and match the connector and polarity perfectly. Get those four right and the replacement just works; get one wrong and the device won’t power up — or gets damaged.

Everything you need is on the rating label of the device or the old adapter. A typical POS adapter label reads like this:

If the label is worn, the device manual lists the same voltage and current. Note the output figures (the DC the device needs), not the input (mains) figures.

Voltage is the one spec with zero tolerance for “close enough.” It must match the device’s rated input because internal regulators expect that level:

Amperage works the opposite way to voltage: it’s a floor, not a fixed target. The device pulls only the current it needs, so equal-or-higher is safe.

A perfectly-specced supply is useless if the plug doesn’t fit the jack — or fits loosely. Match the physical connector too:

A POS power supply runs all day and often powers payment hardware, so safety isn’t optional. Run this final check before buying:

Browse power adapters and internal PSUs in our power supplies category, related parts in terminal repair parts, and DC/power leads in cables & connectors. If your device shows no power at all, first work through our power-supply failure diagnosis guide to confirm the supply is the fault; for printers on the Powered USB standard, see the Powered USB guide. Send us the label figures (V, A, connector) and we’ll match the right supply.