Wall Adapter vs Desktop Power Supply: Which to Specify
External power comes in three common shapes: the wall adapter that plugs straight into the outlet, the desktop brick on a cord, and the enclosed chassis supply. The right one is driven by heat, space and how the end user swaps the AC plug.
Wall Adapter (Wall Wart)
Plugs directly into the outlet, no desk cable. Cheapest and smallest, but it blocks adjacent sockets and gets hot inside a confined space. Best for low-power routers, set-top boxes and small LED drivers under ~36W.
Desktop Brick
Sits on the floor or desk with an IEC/CCC AC inlet and a DC output cord. The heat stays off the wall, and the AC cord is field-replaceable or swappable to local plugs (US/EU/UK/AU). Typical 12W-200W.
Enclosed Chassis Supply
Metal-cased, screw-terminal, convection or fan cooled, mounted inside the product or cabinet. Highest power density and best EMI shielding, but requires the installer to wire AC and provide an enclosure.
How to Decide
- End user just plugs in -> wall or desktop.
- Heat or socket access is a problem -> desktop.
- Product is fixed-installed equipment -> enclosed chassis.
- Global shipment -> desktop with interchangeable AC clips beats a wall adapter locked to one pin style.
FAQ
Is a desktop supply safer than a wall adapter?
Both meet the same safety standard when certified; the desktop simply keeps heat off the outlet and lets you use a local AC cord.
Can a wall adapter be class 2?
Yes. Class 2 (UL 1310) limits output to 100VA and is common for low-power adapters, which also simplifies the installer's wiring rules.
Related Products
- LED Drivers - IP20/IP67, DALI 2.0, 12-1800W
- Power Supplies - adapters, enclosed, DIN rail
- Battery ESS - telecom, UPS, home storage