Garmin JL Audio XB-MFBU-ANL Master ANL Fuse Block, 4 AWG to 1/0 AWG, 250A Max

Overview

The Garmin 010-13727-00 is a JL Audio XB-MFBU-ANL master ANL fuse block for protecting large power cables that feed multiple marine amplifiers or a full onboard audio system.

It accepts 4 AWG to 1/0 AWG power wire through OmniSert captured-wire receptacles, so large conductors can be secured without adapter sleeves. Each wire connection block can rotate to five wire-entry angles, giving the installer more routing options in tight battery compartments, console spaces, lockers, and other crowded areas where heavy cable is hard to bend cleanly.

The block uses forged and machined brass connection elements with stannum plating, along with a high-temperature polycarbonate base and cover for insulation and protection. It requires one properly rated ANL blade fuse, which is sold separately.

Key features

• Master ANL fuse block for large power feeds serving multiple amplifiers or a complete audio system
• Accepts 4 AWG to 1/0 AWG wire through OmniSert captured-wire receptacles without adapter sleeves
• Connection blocks rotate to five wire-entry angles to help route heavy cable in confined onboard spaces
• Forged and machined brass connection elements with stannum plating for use in marine electrical environments
• High-temperature polycarbonate base and cover help insulate and protect the fuse connection point
• Uses one ANL blade fuse matched to the connected equipment, with the fuse sold separately
• No-tool cover removal, with fuse insertion or removal handled using a flat-blade screwdriver or large coin

Installation and setup

This fuse block is used near the main power source or distribution point for an amplifier system, where the main cable needs overcurrent protection before feeding downstream equipment. The rotating connection blocks are useful when the cable path is fixed by bulkheads, battery trays, amplifier boards, or existing wire bundles.

Before installation, confirm the cable size, fuse rating, and placement against the amplifier system requirements and the vessel wiring layout. The ANL fuse should be selected for the equipment and cable being protected, not simply for the largest value that fits the holder.

Marine use on board

This unit is a practical match for boats running higher-current audio systems, including center consoles, sport-fishing boats, cruisers, and wake boats with multiple amplifiers. It is especially useful where a clean main fuse point is needed before power is distributed through the rest of the stereo system.

Mount the block where it remains accessible for inspection and fuse service, while keeping it protected from direct bilge water exposure and unnecessary physical contact. As with any high-current DC connection, cable strain relief and clean terminations matter as much as the fuse block itself.