Sapphire Energy
12 AWG Fused Wire Loop w/30A ATC Fuse
12 AWG Fused Wire Loop w/30A ATC Fuse
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A clean, flexible way to add proper fuse protection to 12V accessories in RV, solar, and marine electrical systems. This kit uses real #12 AWG fine-stranded copper wire (not CCA) with a weatherproof inline ATC/ATO fuse holder and a 30A blade fuse pre-installed. The attached cap stays with the holder so it won’t get lost during installs or service.
Cut-to-fit 3 ft wire loop
The wire comes as a continuous uncut loop so you can trim the length on either side of the fuse holder to match your install. Mount the fuse holder exactly where you want it, then cut the leads to fit — no guesswork and fewer extra splices.
- Fine-stranded copper wire — flexible and easy to route (not CCA)
- 105°C PVC jacket (red) — durable insulation for tough installs
- Molded inline fuse holder — holder is molded to the wire for a clean, rugged connection
- Weatherproof ATC/ATO design — accepts standard ATC/ATO blade fuses
- Attached fuse cap — won’t get lost during servicing
- 30A fuse included — installed and ready to go
- Ideal for 12V accessory circuits up to ~30A
Perfect for adding a properly fused feed to common 12V loads like:
- Diesel heaters (RV & van builds)
- Fish finders & marine electronics
- LED lighting circuits
- DC coolers / fridges
- Vent fans and small blowers
- Battery chargers (12V accessory-side feeds)
- Small pumps and other general 12V accessories
- Solar accessory circuits (controllers, small loads, and branch protection)
Building multiple circuits?
If you’re wiring more than one accessory, a fuse panel gives you accurate protection per circuit and keeps battery terminals clean by avoiding stacked lugs. A fuse block is the cleanest way to distribute power in RV, solar, and marine systems.
| Wire Gauge | 12 AWG |
| Wire Type | Fine-stranded copper (not CCA) |
| Wire Jacket | PVC, 105°C rated (red) |
| Wire Length | 3 ft loop (90 cm) |
| Fuse Holder | Weatherproof inline holder with attached cap |
| Fuse Type | ATC / ATO blade fuse |
| Fuse Included | 30A ATC/ATO (pre-installed) |
| Recommended Max Current | 24A (80% rule for 30A fuse) |
What is this used for?
This is a quick, reliable way to add inline fuse protection to 12V accessory circuits in RV, solar, and marine systems — such as diesel heaters, DC fridges/coolers, LED lighting, fans, fish finders, chargers, and more. The 3 ft loop lets you cut each side to the exact length you need.
What is the “80% rule” for fuses?
For continuous loads, electrical systems are commonly designed so the normal operating current is no more than about 80% of the fuse rating. This helps prevent nuisance blowing and keeps the fuse operating within a safe range.
For example, a 30A fuse is typically suitable for circuits that draw around 24A continuously. Short startup surges above this level are usually fine, but the fuse should always be sized to protect the wire as well as the equipment.
If your accessory draws less current, you may wish to install a smaller fuse. This holder accepts standard ATC/ATO blade fuses.
Do I really need to fuse this circuit?
Yes. Everything should be fused. Fuses protect the wiring and reduce the risk of damage (or fire) if a fault occurs. The fuse should be sized to protect the wire and match the expected load.
Why is the wire a loop instead of two separate leads?
The loop design lets you mount the fuse holder where it makes sense and then trim the wire on both sides to fit your installation. It’s cleaner than guessing lengths up front and helps reduce extra connectors and splices.
What fuse is included, and can I change it?
A 30A blade fuse is included and installed. You can swap it for any standard ATC/ATO blade fuse as needed.
Where should I install the fuse holder?
Install the fuse holder as close to the power source as practical (battery, bus bar, or fuse panel). This protects the wire run from the source to the load.
Is this wire copper or CCA?
It uses fine-stranded copper wire (not copper-clad aluminum / CCA) for better conductivity, flexibility, and current handling.
I have multiple accessories. Is there a cleaner way to wire everything?
Yes — if you’re feeding multiple loads, a fuse panel is usually the cleanest solution. It gives you proper protection per circuit and helps avoid stacking multiple lugs on battery terminals.
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