This DC power extension cable has an inline ON/OFF switch and matching male and female 5.5 x 2.1 mm barrel jacks, designed to add a hardware power switch between any 5 V or 12 V adapter and an LED light bar, bulb, lamp, or similar small device. Copper conductor with PVC insulation, default 30 cm length with longer custom variants available, rated 3 A continuous.
Product Description
This is a short DC power extension cable with an integrated rocker switch. The female 5.5 x 2.1 mm jack accepts the output plug from a typical 5 V or 12 V wall adapter and the male plug at the other end fits the device input — making this an in-line addition to any existing DC power chain. The switch breaks the positive conductor, so when it is in the OFF position the device sees a true zero-volt input and stops drawing standby current.
The conductor is copper, the insulation is PVC, and variants are offered in 20 AWG and 22 AWG plus black and white finishes. The 20 AWG variants carry a slightly higher continuous current with margin; 22 AWG is the right choice for typical 1–3 A LED loads. Operating range is -10 °C to +50 °C, which covers indoor and enclosed-equipment use but not unprotected outdoor automotive deployment.
Key Benefits
- Inline ON/OFF rocker switch — cut power without unplugging
- Pre-fitted male and female 5.5 x 2.1 mm DC barrel jacks for drop-in installation
- 20 AWG and 22 AWG variants for matching gauge to load
- Eliminates standby draw on always-plugged LED lights and accessories
- Color-coded copper conductor (red +, black -) for unambiguous polarity
Key Features
The defining feature is the inline switch sited between matching male and female DC barrel jacks. Plug the female end onto your existing wall adapter, plug the male end into the device, and you have a hardware power switch added to the chain without modifying either the adapter or the device. This is meaningfully more reliable than smart-plug solutions for low-cost LED equipment that has no software shutdown, and it preserves the original adapter and device cabling. Switch is rated to handle the cable's full 3 A continuous current.
Technical Specifications
The defining parameters are the inline ON/OFF switch, the matched 5.5 x 2.1 mm male+female terminations, and the 3 A continuous rating. Full specs below.
| Parameter | Value |
|---|---|
| Wire gauge | 20 AWG or 22 AWG (selectable per variant) |
| Default length | 30 cm (11.8 in); custom lengths available per variant |
| Source connector | 5.5 mm OD x 2.1 mm ID DC barrel jack, female |
| Load connector | 5.5 mm OD x 2.1 mm ID DC barrel plug, male |
| Inline switch | Rocker-style ON/OFF, switches positive line |
| Rated voltage | 5 V or 12 V DC |
| Rated current | 3 A continuous |
| Maximum power | 36 W at 12 V (12 V x 3 A); 15 W at 5 V (5 V x 3 A) |
| Conductor material | Copper |
| Insulation | PVC, color-coded (red +, black -) |
| Polarity | Center positive (standard) |
| Jacket color | Black or white (selectable per variant) |
| Operating temperature | -10 °C to +50 °C (14 °F to 122 °F) |
| Internal SKU | 54G-CBL-SWC-001 |
Technical data sourced from manufacturer documentation.
What's Included
- 1 x DC extension cable assembly with inline ON/OFF switch and matched male+female 5.5 x 2.1 mm barrel jacks (per selected variant)
Compatibility & Applications
This cable is compatible with any 5 V or 12 V wall adapter that uses a 5.5 x 2.1 mm center-positive DC barrel plug, paired with any device that accepts a 5.5 x 2.1 mm female jack and draws no more than 3 A continuous. Typical applications include:
- LED light bars on under-cabinet, shelving, and display setups
- LED bulbs, lamps, and accent lighting without built-in switches
- USB-DC powered fans and small heaters
- Small home-office accessories (desktop humidifiers, mini speakers, signage)
- Bench-supply test runs where you want a hard cutoff between supply and load
Not compatible with: 5.5 x 2.5 mm jacks (different inner diameter), center-negative devices (polarity reversal will damage the load), and devices that require more than 3 A continuous current. Not rated for outdoor unprotected use given the -10 °C to +50 °C operating range.
Why Trust Us
Operated for 5+ years across 35+ countries by a UK-incorporated company specializing in renewable energy and small-electronics components. Every order ships with tracked delivery, a 30-day return window, and a manufacturer-backed warranty against defects. Technical questions are answered by email at info@54energy.net. Last updated: May 2026.
Frequently Asked Questions
Should I pick the 20 AWG or 22 AWG variant?
22 AWG is the right choice for typical LED light strips, lamps, and small fans drawing 1 to 2 A. 20 AWG gives you more current margin and slightly less voltage drop on longer runs, and is the better pick if your load is closer to the 3 A continuous limit, or if you plan to run the cable longer than the 30 cm default.
What if my adapter is 5.5 x 2.5 mm instead of 5.5 x 2.1 mm?
Then this cable is not the right one — the inner diameter difference (2.1 vs 2.5 mm) means the plug will not seat reliably and the contact will be intermittent. Check your adapter's plug specification before ordering; 5.5 x 2.1 mm is more common but 5.5 x 2.5 mm exists on some equipment.
Does the switch eliminate vampire (standby) draw?
Yes. Because the switch breaks the positive line on the DC side, the device sees zero volts when the switch is in OFF, so its internal regulator does not run and there is no standby current draw. Note that the wall adapter itself still draws a small amount of vampire power on the AC side — if you want to eliminate that too, switch the adapter at the wall.
How fast does shipping take?
Orders are dispatched from regional fulfillment partners in North America, Europe, and Asia. Typical delivery is 5 to 15 business days depending on destination country, with tracked shipping included. Specific timelines per destination are listed in the Shipping Policy.
How does this switched DC extension compare to others in its category?
Within the switched DC-extension category, the meaningful comparison points are switch current rating, conductor gauge options, and connector form factor. This product offers a 3 A switch, both 20 AWG and 22 AWG variants, and matched 5.5 x 2.1 mm male+female terminations — the configuration that fits the largest installed base of LED lighting and small-appliance adapters and drives the lowest return rate within our small-electronics category.
Can I request a quote or estimate?
No need to request quotes or estimates. You can purchase all products online directly on our website. Accepted payment methods are credit card, debit card, and Apple Pay, processed securely via Stripe.
