Power Distribution Blocks(904)

Start with your wiring and system layout, then match the block to it.

• Match input gauge: Choose a block with an input that fits your main power cable (many accept 0/2/4 AWG).
• Match output gauge: Pick outputs that fit the runs to your devices (common options are 4/6/8/10 AWG).
• Count your circuits: Select 2-way, 3-way, or 4-way splitters for amps, or larger fuse panels if you’re feeding multiple accessories.
• Material and build: Solid brass/copper blocks offer low resistance; nickel-plated alloys are also common.
• Environment: For marine/RV use, look for covered designs or bus bars rated for 12V (some note 12–48V). Check each product’s specs to confirm compatibility.

It depends on how you want to protect your circuits and how your gear is set up.

• Fused distribution blocks: These accept fuses (often ANL, mini ANL, or AFS) on each branch. They can add convenient, localized protection when placed close to the power source.
• Non‑fused splitters: These simply divide power. They’re often used when devices have their own onboard fuses and you already have a main fuse near the battery.
• General guidance: Use a main fuse on the feed wire and size branch fuses to the wire/device ratings. The right choice varies by system design, so verify the product specs and your equipment’s recommendations.

Many options on this page are described for automotive, marine, and RV applications, but it’s important to confirm each item’s specs.

• Voltage: Most are for 12V DC systems; some bus bars note ranges like 12–48V, and certain fuse panels list 12–32V.
• Materials: Look for corrosion‑resistant finishes and protective covers when installing in humid or exposed areas.
• Mounting: Place in a dry, ventilated location and secure connections with the correct terminals.
• Use case: Bus bars work well for battery distribution; fused blocks help protect accessory circuits. Always follow the product’s instructions and your vehicle’s guidelines.

Plan your layout around wire size, protection, and clean grounds.

1. Disconnect power: Before any work, disconnect the battery.
2. Main feed: Run an appropriately gauged cable from the battery to a fused distribution block mounted close to the battery.
3. Branch runs: From the block, use output gauges that match each amp’s current needs and the block’s rated sizes.
4. Grounding: Use a ground distribution block or bus bar with short, solid grounds to a clean chassis point or battery negative, as applicable.
5. Connections: Use proper terminals, tighten set screws per instructions, and protect with covers. These steps can help reduce voltage drop and clutter, but configurations vary by vehicle and equipment.

Match the fuse type and rating to your block and circuit.

• Fuse type: Check if your block uses ANL, mini ANL, AFS, or blade fuses, and select the same physical style/size.
• Amperage: Choose a rating that aligns with the wire size and the device’s recommended protection. Avoid exceeding the smallest component’s rating.
• Voltage: Use a fuse with a voltage rating that meets or exceeds your system (commonly 12V DC; some components note higher ranges).
• Fit and installation: Ensure the fuse seats properly under the cover. It can be helpful to keep spares on hand. If unsure, refer to your product’s manual or the item’s specifications.