Description
This one-meter DC pigtail connects a compatible regulated 5V or 12V screw-terminal power supply to equipment with a 5.5 × 2.1 mm center-positive barrel input. Its right-angle male plug helps reduce cable projection behind the miner, while the red and black leads arrive stripped and tinned for integration into a properly protected DC harness.
5.5 × 2.1 mm Barrel Pigtail Specifications
| Specification | Details |
|---|---|
| DC connector | 5.5 mm outer × 2.1 mm inner male barrel plug |
| Orientation | 90-degree right angle |
| Polarity | Center positive when red is wired to V+ and black to V− |
| Cable | UL2464 two-conductor round cable, 16 AWG |
| Length | 1000 ± 20 mm |
| Lead preparation | Red and black conductors, stripped and tinned approximately 5 ± 1 mm |
| Power system | Regulated 5V or 12V DC when the device voltage, polarity, connector, current requirement, and complete circuit rating all match |
Compatible 5V and 12V Bitcoin Miners
Connector size alone does not prove compatibility. This passive pigtail can carry regulated 5V or 12V DC, but the miner voltage, center-positive polarity, 5.5 × 2.1 mm plug, current requirement, power-supply capacity, branch protection, and terminals must all match.
| Miner | Compatibility note |
|---|---|
| Bitaxe Gamma 602 | 5V DC, 5.5 × 2.1 mm center-positive input. The official Gamma hardware documentation calls for a supply above 4A/20W. |
| Bitaxe Gamma Duo 650 | 5V barrel-input model with a higher stock load than a single-chip Gamma; verify PSU capacity and connector temperature under load. |
| Nerdaxe Gamma Revision 2.3 | 5V, 5A minimum, more than 25W recommended, with a 5.5 × 2.1 mm center-positive input. |
| Bitaxe Supra | Compatible 5V barrel-input family; confirm the exact board revision and polarity before wiring. |
| Legacy NerdQaxe+ barrel-input revisions | Compatible only with older 12V models that use a 5.5 × 2.1 mm center-positive barrel input. Verify the exact hardware revision and required current. |
| Legacy NerdQaxe++ barrel-input revisions | Compatible only with pre-XT30 12V revisions. Current Revision 7 uses XT30 and does not accept this barrel plug. |
Not for current XT30 miners: do not use this barrel pigtail with a current Bitaxe GT, NerdQaxe++ Revision 7, Naja Duo, or Turbo Touch. Those miners use XT30 inputs. A matching voltage does not make a different connector or polarity safe.
Compatible 5V and 12V Power Supplies
- Mean Well LRS-50-5 50W 5V power supply for one appropriately configured 5V miner.
- Mean Well LRS-350-5 300W 5V power supply for a designed multi-miner 5V distribution system with an individually protected branch for every miner.
- Mean Well LRS-350-12 348W 12V power supply for compatible legacy 12V barrel-input hardware and properly engineered distribution.
- Mean Well LRS-600-12 600W 12V power supply for high-current 12V distribution with correctly sized and individually protected branches.
The pigtail is not a regulator, fuse, current limiter, or polarity protector. Do not connect it directly to AC mains. Ring or fork terminals, distribution hardware, enclosure, strain relief, and branch protection are not included.
Installation Checklist
- Disconnect AC input and verify the supply is de-energized.
- Set and meter the DC output at the exact voltage required by the connected miner, either 5V or 12V, before making the connection.
- Confirm center-positive polarity at the barrel plug with a multimeter.
- Terminate red to V+ and black to V− using hardware rated for the conductor, terminal block, and current.
- Add correctly sized branch protection near the source and secure the cable with strain relief.
- Start at stock miner settings; inspect voltage at the miner and connector temperature under sustained load.
Helpful Guides and Compatible Hardware
Mean Well LRS-50-5 5V Power Supply
A compact regulated 5V screw-terminal supply for a properly sized single-miner circuit.
Mean Well LRS-350-5 5V Power Supply
A high-current 5V source for engineered distribution with protected individual branches.
Mean Well LRS-350-12 12V Power Supply
A regulated 12V source for compatible legacy barrel-input miners and protected DC branches.
The 80% Rule for Miner Power Supplies
Plan continuous load headroom, conductor capacity, terminations, and cooling before wiring.
Bitaxe Maintenance and Care
Check connectors, airflow, temperatures, and voltage before increasing frequency or voltage.
What wire gauge does this pigtail use?
Can this barrel pigtail be used with both 5V and 12V miners?
Which 5V miners use this barrel pigtail?
Which 12V miners use this barrel pigtail?
Can I use it with the current NerdQaxe++ Revision 7, Bitaxe GT, Naja Duo, or Turbo Touch?
Which Mean Well power supplies are compatible?
Is red always positive and black negative?
Does the cable convert 12V to 5V or 5V to 12V?
Can I power multiple miners from one Mean Well supply?
Does 16 AWG guarantee enough current for every barrel-input miner?
Are ring or fork terminals included?
What should I check before first power-up?
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