External power adapters are separate mains-to-DC units that power devices without a built-in power supply, such as routers, switches, mini PCs, single-board computers and laptops. Our range includes adapters from Cisco, DIGITUS, Raspberry Pi, Shuttle and MikroTik, for home offices, workstations and network cabinets.
How to choose an external power adapter
Compatibility. Start with the device the adapter is meant for. Many adapters in our range are made for a specific product line, for example Cisco network equipment, Raspberry Pi boards or Shuttle mini PCs, so check the model name or the rating label on your device before ordering.
Voltage and current. The output voltage (V) must match what your device asks for. The current (A) on the adapter should be equal to or higher than the device requirement, because a device only draws what it needs. A lower current rating leads to overheating, random restarts or no power at all.
Power rating in watts. Multiply volts by amps to get watts. Small network devices and single-board computers need modest wattage, while laptops, workstation-class mini PCs and conferencing equipment need noticeably more. Leave some headroom if the device runs under heavy load for long periods.
Connector and polarity. Barrel connectors differ in outer and inner diameter, and some devices use USB-C or proprietary plugs instead. Polarity matters too: the centre pin is usually positive, but not always, and reversed polarity can damage electronics.
Mains plug and safety. Check that the plug suits your wall sockets or that you have a suitable lead for it. Look for CE marking or equivalent safety approvals, especially for adapters that stay switched on around the clock in a server cupboard or at a desk.
Brands of external power adapters we carry
- Cisco: the largest group in our range, with adapters for Cisco switches, routers and IP phones, which are designed around the voltage each device requires.
- DIGITUS: known for network and connectivity accessories, including power supplies used in structured cabling and small office installations.
- Raspberry Pi: the maker of the Raspberry Pi single-board computers, which also supplies power adapters matched to the current demands of its boards.
- Shuttle: a manufacturer of small-form-factor and mini PCs, with adapters made for those systems.
- MikroTik: a Latvian networking brand known for RouterOS routers and switches, with adapters for its own hardware.
- ACER and AKYGA: ACER adapters are made for its laptops and monitors, while AKYGA is known for replacement chargers and adapters for a variety of devices.
Also in our range: Dehner, Teltonika, Owl Labs, HPE and Wacom.
External power adapters FAQ
What is the difference between an external power adapter and an internal PC power supply?
An external power adapter sits outside the device, usually in a box on the cable, and converts mains power to low-voltage DC. An internal PC power supply is built into a desktop case and feeds several components at once. Mini PCs, routers and laptops typically use external adapters because they have no room for an internal unit.
Can I use an adapter with a higher amperage than the original?
Yes, as long as the voltage and connector match and the polarity is the same. The device draws only the current it needs, so an adapter rated for more amps simply has spare capacity. An adapter with lower amperage than required should not be used.
How do I find the right adapter for my device?
Read the rating label on the device or its original adapter. It lists the input voltage, the output voltage and current, and often a polarity symbol. Match these values and the connector type, or look up the exact model name of your device.
Is it safe to use an adapter from a different brand?
It can be safe if the voltage, current, polarity and connector all match the device requirements and the adapter carries proper safety approvals. The brand on the label matters less than these specifications. For devices that are sensitive to voltage, such as network equipment or mini PCs, an adapter made for that product line is the simplest choice.
