DC Barrel Plug Adapter, Female 2.1mm x 5.5mm to Male 2.5mm x 5.5mm, 20 AWG | RC-X2555C1

DC Barrel Plug Adapter — Female 2.1mm x 5.5mm to Male 2.5mm x 5.5mm | Part RC-X2555C1

The RC-X2555C1 is a compact, heavy-duty DC barrel conversion cable that solves one of the most common power compatibility problems: your power supply or extension cable has a 2.1mm barrel output, but your device requires a 2.5mm barrel input. No cutting, no soldering, no rewiring — just plug in and go.

Built with thick 20 AWG pure copper wiring and a flexible 3-inch cable, it delivers maximum current with minimal voltage drop, making it suitable for demanding applications like CCTV cameras, LED drivers, and power distribution blocks.

Technical Specifications

• Part Number: RC-X2555C1
• Input (Female End): 2.1mm (ID) x 5.5mm (OD) barrel socket
• Output (Male End): 2.5mm (ID) x 5.5mm (OD) barrel plug
• Wire Gauge: 20 AWG pure copper (not CCA)
• Cable Length: ~3 inches (compact pigtail design)
• Polarity: Passes through — center positive in = center positive out

Common Use Cases

• Power Supply Upgrades: Use a standard 2.1mm wall adapter with devices that require a 2.5mm input
• Cross-Compatibility: Link 2.1mm extension cords or splitters to 2.5mm power distribution blocks
• CCTV & Security: Adapt 2.1mm camera power supplies to 2.5mm camera inputs
• LED Lighting: Connect 2.1mm power supplies to 2.5mm LED driver inputs
• Project Enclosures: Quickly adapt mismatched barrel connectors without custom wiring

Frequently Asked Questions

Q: Does this change the polarity?
A: No. The RC-X2555C1 passes polarity straight through. Center positive in = center positive out.

Q: What is the difference between 2.1mm and 2.5mm barrel connectors?
A: The inner diameter (ID) of the center pin is 2.1mm vs. 2.5mm. The outer diameter (OD) is the same at 5.5mm. They look similar but are not interchangeable without an adapter like this one.

Q: Need the reverse — 2.5mm female to 2.1mm male?
A: See our RC-X2155C1 for the reverse conversion.

Q: What is the maximum current this adapter supports?
A: The 18 AWG pure copper conductors support up to approximately 5–7A for a 3-inch run. Always verify against your power supply's rated output.