Power DC Adapter Dongle ProXtend DCDONGLE-5525-4017-L 5.5mm to 4.0mm

ProXtend DCDONGLE-5525-4017-L is a compact DC power adapter dongle that converts a 5.5 mm outer / 2.1 mm inner barrel plug to a 4.0 mm barrel plug. The adapter enables straightforward compatibility between power supplies and devices with different barrel connector sizes, allowing continued use of existing adapters without modification. Designed for quick connection, it suits a range of consumer and professional electronics that use coaxial DC power connectors.

Advantages

The adapter provides a simple mechanical conversion with no tools required, maintaining reliable electrical contact and minimizing loss while preserving polarity. Its small form factor makes it portable and easy to store with power cables. The product is non-invasive — it adapts existing plugs rather than requiring rewiring or replacement of adapters — and is suitable for temporary or permanent use where connector size mismatch occurs.

Suitable for

• Laptops and netbooks with compatible barrel power input
• Routers, modems and network equipment
• CCTV cameras and DVR systems
• Portable audio equipment and small appliances that use DC barrel connectors
• Testing benches and service environments where various plug sizes are used

Key specifications

• Input barrel size: 5.5 mm outer / 2.1 mm inner
• Output barrel size: 4.0 mm outer
• Connection type: coaxial DC barrel adapter
• Material: metal contacts with insulating body
• Polarity: preserves center-positive or center-negative according to original plug orientation
• Dimensions: compact inline dongle design for minimal cable strain

How to use

Insert the source plug (5.5 mm outer / 2.1 mm inner) into the adapter’s input side until it seats firmly. Connect the adapter’s 4.0 mm output directly to the device’s barrel input. Verify the connection is snug and check device power operation. Confirm correct polarity and voltage compatibility between the power supply and the device before use to prevent damage. The adapter requires no assembly and can be attached or removed as needed.

Usage recommendations

Use the dongle only with power supplies that match the device’s required voltage and current ratings. Avoid forcing mismatched plugs; ensure a clean, debris-free connection for reliable contact. For prolonged installations, confirm the adapter does not introduce excessive strain on cables or connectors and periodically check connections for heat or wear.