DC Polarity-Reversing Barrel Adapter, 2.5mm x 5.5mm Female to Male, 18 AWG | RC-R25
DC Polarity-Reversing Adapter: 2.5mm x 5.5mm Female to Male
WARNING: THIS ADAPTER REVERSES DC POLARITY. It is NOT a standard straight-through extension cable. Use only when your equipment requires the opposite polarity from your DC power supply. Incorrect polarity can damage equipment. Verify the polarity at the adapter's output plug with a multimeter before connecting your device.
Part RC-R25 is intended to reverse the center and outer-barrel polarity of a compatible DC power supply while keeping the same 2.5mm x 5.5mm barrel connector size. It has a female socket, a straight male plug, 18 AWG wire, and a 3-inch cable. Plug-in connections require no soldering.
Intended Use: Reverse Polarity, Not Connector Size
- Center-positive supply in: Center-negative output at the male plug.
- Center-negative supply in: Center-positive output at the male plug.
- Same connector dimensions: Both ends are 2.5mm x 5.5mm.
- Not a voltage converter: This adapter does not regulate voltage or convert AC to DC.
DO NOT USE if your power supply already matches the equipment's required polarity. Adding this adapter would reverse that correct polarity. Connector fit alone does not establish compatibility.
Technical Specifications
- Part: RC-R25
- Power-supply connection: 2.5mm x 5.5mm female barrel socket
- Device connection: 2.5mm inside diameter x 5.5mm outside diameter straight male barrel plug
- Function: DC polarity reversal between center and outer-barrel contacts
- Wire gauge: 18 AWG
- Cable length: 3 inches
- Installation: Plug-in connections; no soldering required
Compatibility Checklist
- Your equipment requires DC power, not AC output.
- Your power supply provides the equipment's required voltage and sufficient current capacity.
- Your power supply's polarity is opposite to the equipment's required polarity, so reversal is necessary.
- The power-supply plug and equipment connection match the 2.5mm x 5.5mm barrel dimensions; verify insertion length and clearance.
- The adapter's allowable voltage and current are verified for the installation; 18 AWG alone does not establish a complete assembly rating.
- Before connecting equipment, measure the output-plug polarity with a multimeter and confirm that it matches the equipment documentation.
Applications and Replacement Guidance
Use Part RC-R25 only for an otherwise compatible DC power supply that needs its polarity reversed to match the equipment. It is not a general-purpose extension or an automatic compatibility solution. No specific pedal, camera, router, radio-controlled device, or other equipment match is claimed.
Frequently Asked Questions
What is this adapter intended to do?
It reverses DC polarity between the center and outer-barrel contacts while retaining 2.5mm x 5.5mm barrel dimensions. Use it only when polarity reversal is required.
Is the output always center-negative?
No. A center-positive supply becomes center-negative at the output plug; a center-negative supply becomes center-positive. The resulting polarity depends on the connected supply. Verify it with a multimeter before connecting equipment.
Can I use it as a standard extension cable?
No. It reverses polarity rather than passing it straight through. If your supply already has the correct polarity, this adapter would make it incorrect and could damage the equipment.
Does it change voltage or convert AC to DC?
No. It is not a voltage converter, regulator, or AC-to-DC power supply. Start with a DC supply whose voltage and current capacity meet the equipment requirements.
Does a matching plug guarantee compatibility?
No. Verify DC voltage, current, connector dimensions, insertion length, assembly ratings, and the resulting output polarity. Both ends use 2.5mm x 5.5mm connectors; this is not a 2.1mm connector-size adapter.
