DC Polarity Reversing Cable, 2.1 x 5.5mm, 18 AWG, 3 ft | RC-RN2155
DC Polarity-Reversing Cable: 2.1mm x 5.5mm, 18 AWG, 3 Feet
WARNING: THIS CABLE REVERSES DC POLARITY
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 output plug with a multimeter before connecting your device.
Part RC-RN2155 is a 3-foot, 18 AWG DC cable intended to reverse the center and outer-barrel polarity of a compatible power supply. It accepts a 2.1mm x 5.5mm male barrel plug in its female socket and provides a 2.1mm x 5.5mm male barrel plug for the equipment connection. No cutting or soldering is required.
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 use 2.1mm x 5.5mm barrel connections.
- Not a voltage converter: This cable does not regulate voltage or convert AC to DC.
DO NOT USE IF YOUR SUPPLY ALREADY HAS THE CORRECT POLARITY
This cable would reverse that correct polarity and could damage your equipment. Do not use it merely to extend a cable. Matching connector sizes alone do not establish compatibility.
Technical Specifications
- Part: RC-RN2155
- Power-supply connection: 2.1mm x 5.5mm female barrel socket
- Device connection: 2.1mm inside diameter x 5.5mm outside diameter male barrel plug
- Function: DC polarity reversal between center and outer-barrel contacts
- Wire gauge: 18 AWG
- Cable length: 3 feet
- 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 2.1mm x 5.5mm barrel dimensions; verify insertion length and clearance.
- The cable assembly's allowable voltage and current are verified for the installation; 18 AWG alone does not establish a complete assembly rating.
- Before connecting equipment, measure output-plug polarity with a multimeter and confirm it matches the equipment documentation.
Applications and Replacement Guidance
Use Part RC-RN2155 only with an otherwise compatible DC power supply that needs polarity reversal to match the equipment. Its 3-foot length provides cable reach while performing that specific function; it is not a general-purpose extension or an automatic compatibility solution. No specific pedal, camera, router, or other equipment match is claimed.
Frequently Asked Questions
What is this cable intended to do?
It intentionally reverses polarity between the center and outer-barrel contacts while keeping the same 2.1mm x 5.5mm connector dimensions.
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 cable 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.
Is this the same size and length as Part RC-R25?
No. Part RC-RN2155 uses 2.1mm x 5.5mm connectors and a 3-foot cable. Part RC-R25 uses 2.5mm x 5.5mm connectors and a 3-inch cable. Verify the exact connector dimensions and required reach before ordering.
