Blue Sea Systems 400A ANL Fuse, Stud-Mount 32V DC — 6,000A Interrupt, Visible Blown Indicator

Blue Sea Systems 400A ANL stud-mount fuse delivers heavy-duty 32V DC protection with a 6,000 A interrupt rating and clear blown indication for marine and vehicle battery systems.

Designed for demanding DC power installations, this ANL fuse (Model 5136) combines robust interrupt capacity with corrosion-resistant silver-plated blades and ignition protection for gasoline-powered boats. It’s a single 400-amp replacement fuse that fits popular Blue Sea fuse blocks and is shaped for stud-mount applications where dependable main-battery circuit protection is required.

What does this fuse protect against in a DC power system?

The 400A ANL fuse is sized to protect main battery feeds and large sub-distribution circuits from excessive current and potential wiring damage. With a 6,000 ampere interrupt capacity (AIC) at up to 32V DC, it can clear very high fault currents so downstream wiring and components are less likely to sustain severe damage.

• Rated 400 amps for continuous DC circuits
• 6,000 AIC at 32V DC meets ABYC-type protection expectations
• Visible blown indicator allows quick visual diagnostics
• Stud-mount form factor for main bus and distribution blocks

How does it handle marine and gasoline-engine installations?

This fuse meets ignition-protection criteria for safe use aboard gasoline-powered vessels (SAE J1171 conformity for 35–500A sizes), reducing the risk of igniting flammable vapors if a fault occurs. Silver-plated blades resist corrosion in marine environments, preserving low-resistance connections and long-term reliability.

• Ignition-protected per SAE J1171 for applicable amp ranges
• Silver-plated connectors for improved corrosion resistance
• Suitable for main battery banks and large DC feeders on boats

Will this fit my existing Blue Sea fuse block or panel?

The 5136 ANL fuse is shaped to match common stud-mount housings and is compatible with Blue Sea Systems fuse blocks such as models 5004 and 5005. Confirm your block accepts ANL stud fuses and that a 400A rating is appropriate for the circuit being protected.

• Form factor: stud-mount ANL style, 3.185" long × 0.89" wide
• Direct fit for Blue Sea 5004 and 5005 fuse blocks
• Replace only with equal or suitably rated fuse per system design

What practical features make installation and service easier?

The fuse includes a visible blown condition indicator to speed troubleshooting without disassembly, and the silver-plated blades help ensure reliable electrical contact over time. Its compact ANL body makes it easy to install in tight fuse panels or on buss bars where space is limited.

• Visible blown indicator for fast fault identification
• Compact ANL stud mount fits crowded panels and buss bars
• Silver-plated blades reduce contact corrosion and resistance

Who is this for? Installers, boat owners, RV technicians, and anyone managing large DC battery banks who need a dependable 400A main or feeder fuse will find this Blue Sea Systems ANL fuse appropriate. It’s aimed at applications that require high interrupt capacity, corrosion-resistant connections, and easy visual fault detection, and it pairs directly with Blue Sea 5004/5005 fuse blocks or similar stud-mount ANL housings.