Fuses

Marine Electrical Protection

Marine Fuses, Fuse Blocks & Circuit Protection

Shop marine fuses, fuse holders, fuse blocks, battery terminal fuses, ANL and MIDI fuses, breakers, bus bars, and electrical protection parts for safer 12V and 24V boat systems.

Shop Fuses Fuse Blocks ANL Fuses

Protection Check

Choose fuse style and amp rating by the protected wire, circuit load, voltage, holder type, and manufacturer recommendations.

Shop Fuse Holders

Electrical protection is safety-critical. Confirm fuse rating, wire gauge, interrupt rating, ignition protection, environment, and ABYC-style installation practices before servicing marine wiring.

Quick Shop Fitment Fuse Types Inspection Install Notes FAQ Circuit Breakers Bus Bars

Match the Fuse to the Wire and Circuit

A fuse protects the wiring, not just the device. Start with wire gauge, circuit length, load, voltage, holder style, and the equipment manual. The correct amp rating should protect the conductor while allowing normal operation.

12V Fuses 24V Fuses Marine Wire

Selection

Do Not Upsize a Fuse to Stop Nuisance Blowing

A repeatedly blown fuse usually points to overload, short circuit, corrosion, weak connections, water intrusion, failed equipment, or the wrong circuit design.

Before replacing with the same fuse, inspect the holder, terminals, wire insulation, connected device, and any recent wiring changes.

ANL

High-Current Fuses

ANL, Class T, MRBF, and MIDI styles are often used near batteries, chargers, windlasses, thrusters, and inverters.

ATC

Blade Fuses

ATO, ATC, and mini blade fuses are common in DC panels, accessory circuits, electronics, pumps, lights, and small loads.

BRK

Breakers

Marine circuit breakers can provide resettable protection, panel switching, or main-feed protection when correctly sized.

Inspection

Check the Holder, Terminals, and Heat Marks

Many electrical problems show up at connection points. A fuse can look fine while the holder, crimp, screw terminal, or bus connection is corroded, loose, overheated, or undersized.

CorrosionLook for green copper, white powder, darkened terminals, or moisture inside holders and panels.

Heat damageInspect melted plastic, brittle insulation, discolored lugs, and soft or distorted fuse bodies.

Loose connectionsLoose screws, weak crimps, and poor contact add resistance and can cause voltage drop or heat.

Wrong fuse styleUse the correct fuse form, voltage rating, amperage, and holder type for the circuit.

Installation Notes

Protect Power Close to the Source

Main battery feeds, charger outputs, windlass circuits, inverter cables, thruster feeds, and panel supply wires typically need protection close to the power source. Long unprotected runs increase risk.

Battery Fuses Battery Cable Terminal Lugs

Related Parts

Build the Circuit Around the Protection

Fuse blocks, bus bars, heat-shrink terminals, battery switches, cable glands, labels, and marine-grade wire all help keep the system serviceable and protected.

For electronics, pumps, lights, and accessories, use clean distribution and label each circuit so troubleshooting is easier later.

FAQ

Marine Fuse Questions

What does a fuse protect on a boat?

A fuse protects the wiring from overload or short-circuit current. It should be sized for the conductor and circuit design, not simply the maximum device draw.

Can I replace a blown fuse with a higher amp fuse?

No. Upsizing a fuse can allow wiring to overheat before the fuse opens. Find the reason the fuse blew and replace it with the correct rating and style.

What fuse type should I use near a battery?

Battery feeds often use high-current protection such as ANL, Class T, MIDI, or terminal fuses, depending on circuit size and equipment requirements. Match the fuse and holder to the cable and load.

Why does a fuse holder get hot?

Heat can come from loose terminals, corrosion, undersized parts, overloaded circuits, poor crimps, or incorrect fuse and holder combinations. Inspect and correct the cause before returning the circuit to service.

Ready to Protect the Circuit?

Shop Marine Fuses, Holders, Blocks & Circuit Protection

Search by fuse type, amp rating, voltage, holder style, circuit, wire size, battery protection need, or electrical accessory.

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Blue Sea 5235 Fuse ATO/ATC 1Amp 2/Pk

$7.99 - $7.99

$7.99

$7.99 - $7.99

$7.99

Item locally warehoused

Blue Sea Systems 5235 ATO/ATC 1Amp fast-acting blade fuses (2-pack) provide reliable circuit protection for small DC electronics and loads. Key Fea...

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$7.99 - $7.99

$7.99

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$7.99

Blue Sea 5281 GMA® and AGA® Mini Glass Tube Fuse, 2 Amp, 3/pk

$9.49 - $9.49

$9.49

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$9.49

Item locally warehoused

Blue Sea Systems 5281 GMA® and AGA® Mini Glass Tube Fuse is a 2 Amp fast-acting glass fuse kit intended for DC systems. Key Features Visible indic...

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$9.49 - $9.49

$9.49

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Fuse Maxi 50 Ampere

$13.55 - $13.55

$13.55

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$13.55

Item locally warehoused

Protect your DC electrical circuits with this Blue Sea Systems MAXI fuse rated for 50A. Designed with tin-plated connector blades for corrosion res...

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$13.55

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Blue Sea 5280 GMA® and AGA® Mini Glass Tube Fuse, 1 Amp, 3/pk

$9.49 - $9.49

$9.49

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$9.49

Item locally warehoused

Blue Sea 5280 GMA® and AGA® mini glass tube fuse is a fast-acting, visible-status fuse designed for small circuit protection in 12V/24V DC applicat...

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$9.49

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$9.49

Fuse Maxi 40 Ampere

$13.55 - $13.55

$13.55

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$13.55

Item locally warehoused

Blue Sea Systems MAXI Fuse (40 Amp, SKU 661-5139) provides reliable DC circuit protection with tin-plated connector blades for corrosion resistance...

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$13.55

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$13.55

Blue Sea 5275 GMA® and AGA® Mini Glass Tube Fuse, 20 Amp, 5/pk

$7.79 - $7.79

$7.79

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$7.79

Item locally warehoused

Blue Sea Systems 5275 GMA® and AGA® mini glass tube fuse (20A) is a fast-acting, visible-blown glass fuse designed for 12V/24V DC circuit protectio...

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$7.79

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Blue Sea 5274 ATM® Mini Blade Fuse, 30 Amp, Green, 2/pk

$5.39 - $5.39

$5.39

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$5.39

Item locally warehoused

The Blue Sea 5274 ATM® mini blade fuse is a 30A, green fuse designed for compact, color-coded circuit protection. This 2-pack provides a convenient...

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$5.39

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Fuse Maxi 30 Ampere

$13.55 - $13.55

$13.55

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$13.55

Item locally warehoused

Replace a blown MAXI fuse with a corrosion-resistant, tin-plated option built for high DC interrupt performance—featuring visible indication of a b...

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$13.55 - $13.55

$13.55

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Blue Sea 5273 ATM® Mini Blade Fuse, 20 Amp, Yellow, 2/pk

$5.39 - $5.39

$5.39

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$5.39

Item locally warehoused

Blue Sea 5273 ATM® mini blade fuse (20 Amp, yellow) helps protect marine electrical circuits with a color-coded, corrosion-resistant design and vis...

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$5.39

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Fuse ANL 500 Amp

$70.29 - $70.29

$70.29

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$70.29

Item locally warehoused

The Blue Sea Systems ANL Fuse (500 Amp) is an ignition-protected, high-current DC fuse designed for demanding marine battery bank and DC main circu...

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$70.29

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Blue Sea 5272 ATM® Mini Blade Fuse, 15 Amp, Blue, 2/pk

$6.79 - $6.79

$6.79

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$6.79

Item locally warehoused

The Blue Sea 5272 ATM® mini blade fuse (15 Amp, blue) provides compact overcurrent protection and includes a visible indication if the fuse has blo...

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$6.79

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Fuse ANL 400 Amp

$70.29 - $70.29

$70.29

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Item locally warehoused

Protect high-current DC circuits with a 400 Amp ANL fuse built for marine use—featuring corrosion-resistant, tin-plated blades and visible blown-co...

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$70.29

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Fuse ANL 350 Amp

$73.69 - $73.69

$73.69

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$73.69

Item locally warehoused

The Fuse ANL 350 Amp from Blue Sea Systems is an ignition-protected ANL fuse designed for main DC circuit protection on large battery banks—featuri...

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$73.69

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Blue Sea 5271 ATM® Mini Blade Fuse, 10 Amp, Red, 2/pk

$5.39 - $5.39

$5.39

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$5.39

Item locally warehoused

Blue Sea 5271 ATM® mini blade fuse provides compact, color-coded circuit protection with tin-plated connector blades for corrosion resistance. This...

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$5.39 - $5.39

$5.39

$5.39 - $5.39

$5.39

Fuse ANL 300 Amp

$70.29 - $70.29

$70.29

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$70.29

Item locally warehoused

Protect your main DC circuit protection with an ANL fuse rated for 300 Amp service. Designed for marine use with corrosion-resistant connector blad...

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$70.29 - $70.29

$70.29

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$70.29

Fuse ANL 250 Amp

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$70.29

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$70.29

Item locally warehoused

The Blue Sea Systems ANL 250 Amp fuse (SKU 661-5131) is an ignition-protected, marine-rated high-current fuse designed for corrosion-resistant conn...

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$70.29 - $70.29

$70.29

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$70.29

Blue Sea 5220 AGC® Glass Tube Fuse, 30A, 5/pk

$11.99 - $11.99

$11.99

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$11.99

Item locally warehoused

Blue Sea Systems 5220 AGC® glass tube fuse provides fast, reliable circuit protection with a visible indication if the fuse is blown. Key Features ...

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$11.99 - $11.99

$11.99

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$11.99

Blue Sea 5218 AGC® Glass Tube Fuse, 20A, 5/pk

$9.69 - $9.69

$9.69

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$9.69

Item locally warehoused

Blue Sea Systems 5218 AGC® glass tube fuse delivers fast-acting circuit protection with a visible indication of a blown condition. Sold as a 5-pack...

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$9.69

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Fuse ANL 200 Amp

$58.39 - $58.39

$58.39

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$58.39

Item locally warehoused

A 200 Amp ANL fuse with tin-plated connector blades for corrosion resistance, featuring a visible blown-condition indicator. Built for reliable DC ...

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$58.39

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$58.39

Blue Sea 5217 AGC® Glass Tube Fuse, 15A, 5/pk

$9.69 - $9.69

$9.69

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$9.69

Item locally warehoused

Blue Sea 5217 AGC® Glass Tube Fuse (15A) is a fast-acting, corrosion-resistant glass tube fuse with visible blown-condition indication—supplied as ...

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$9.69 - $9.69

$9.69

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Fuse ANL 175 Amp

$61.99 - $61.99

$61.99

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$61.99

Item locally warehoused

Protect critical DC circuits with a high-output ANL fuse built for marine electrical systems. This 175 amp ANL fuse features corrosion-resistant ti...

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$61.99 - $61.99

$61.99

$61.99 - $61.99

$61.99

Blue Sea 5215 AGC® Glass Tube Fuse, 10A, 5/pk

$9.69 - $9.69

$9.69

$9.69 - $9.69

$9.69

Item locally warehoused

Blue Sea Systems 5215 AGC® Glass Tube Fuse (10A) provides fast-acting circuit protection in a compact glass-tube format with visible indication of ...

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$9.69 - $9.69

$9.69

$9.69 - $9.69

$9.69

Blue Sea 5213 AGC® Glass Tube Fuse, 7.5A, 5/pk

$9.69 - $9.69

$9.69

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$9.69

Item locally warehoused

Blue Sea 5213 AGC® glass tube fuses are fast-acting and designed for corrosion resistance, with a visible indication of a blown condition. Sold as ...

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$9.69

$9.69 - $9.69

$9.69

Fuse ANL 150 Amp

$58.39 - $58.39

$58.39

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$58.39

Item locally warehoused

Protect high-current DC circuits with this ANL 150 Amp fuse from Blue Sea Systems (LNS). It features tin-plated connector blades to help resist cor...

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$58.39 - $58.39

$58.39

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Blue Sea 5211 AGC® Glass Tube Fuse, 6A, 5/pk

$7.69 - $7.69

$7.69

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$7.69

Item locally warehoused

Blue Sea 5211 AGC® glass tube fuse (6A) provides fast overcurrent protection with a visible indication of a blown condition, packaged 5 per pack. K...

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Fuse ANL 130 Amp

$58.39 - $58.39

$58.39

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$58.39

Item locally warehoused

Marine-grade ANL fuse with visible blown indication and ignition protection for safer installation in gasoline-powered boat systems. Designed with ...

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Fuse ANL 100 Amp

$58.39 - $58.39

$58.39

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$58.39

Item locally warehoused

The Fuse ANL 100 Amp (661-5125) from Blue Sea Systems is an ignition-protected ANL fuse designed for DC main-circuit protection in demanding marine...

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$58.39 - $58.39

$58.39

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Blue Sea 5210 AGC® Glass Tube Fuse, 5A, 5/pk

$9.69 - $9.69

$9.69

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$9.69

Item locally warehoused

Blue Sea Systems 5210 AGC® glass tube fuse is a fast-acting, corrosion-resistant protection solution with visible indication when the fuse has blow...

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$9.69 - $9.69

$9.69

$9.69 - $9.69

$9.69

Blue Sea 5209 AGC® Glass Tube Fuse, 4A, 5/pk

$7.69 - $7.69

$7.69

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$7.69

Item locally warehoused

Blue Sea 5209 AGC® glass tube fuse (4A), 5-pack—fast-acting and designed with corrosion-resistant construction for reliable DC circuit protection. ...

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$7.69

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Fuse ANL 80 Amp

$58.39 - $58.39

$58.39

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$58.39

Item locally warehoused

Blue Sea Systems ANL fuse designed for reliable DC main circuit protection. This 80 Amp fuse features tin-plated connector blades for corrosion res...

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$58.39 - $58.39

$58.39

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$58.39

Blue Sea 5208 AGC® Glass Tube Fuse, 3A, 5/pk

$9.69 - $9.69

$9.69

$9.69 - $9.69

$9.69

Item locally warehoused

Blue Sea 5208 AGC® glass tube fuse is a fast-acting, corrosion-resistant protection solution with a visible indication when the fuse has blown. Key...

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$9.69 - $9.69

$9.69

$9.69 - $9.69

$9.69

Fuse ANL 60 Amp

$58.39 - $58.39

$58.39

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$58.39

Item locally warehoused

Blue Sea Systems ANL Fuse (60 Amp) is built for DC circuit protection in marine electrical systems. It features tin-plated connector blades for cor...

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$58.39 - $58.39

$58.39

$58.39 - $58.39

$58.39

Blue Sea 5207 AGC® Glass Tube Fuse, 2.5A, 5/pk

$7.69 - $7.69

$7.69

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$7.69

Item locally warehoused

The Blue Sea 5207 AGC® glass tube fuse is a fast-acting, corrosion-resistant fuse designed for DC and AC protection (per rating) and includes a vis...

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$7.69 - $7.69

$7.69

$7.69 - $7.69

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Fuse ANL 50 Amp

$58.39 - $58.39

$58.39

$58.39 - $58.39

$58.39

Item locally warehoused

Protect high-current DC circuits with a marine-grade ANL fuse rated for 50 Amps. This ignition-protected fuse features tin-plated connector blades ...

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$58.39 - $58.39

$58.39

$58.39 - $58.39

$58.39

Blue Sea 5206 AGC® Glass Tube Fuse, 2A, 5/pk

$7.69 - $7.69

$7.69

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$7.69

Item locally warehoused

Blue Sea Systems AGC® glass tube fuse for replacing fast-acting circuit protection. Includes visible indication of a blown condition and comes in a...

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$7.69 - $7.69

$7.69

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Blue Sea 5246 Fuse ATO/ATC 40 Amp 2/Pk

$6.79 - $6.79

$6.79

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$6.79

Item locally warehoused

Blue Sea 5246 ATO/ATC style fuse set delivers fast-acting DC protection in a corrosion-resistant, tin-plated blade design—helping you keep small DC...

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$6.79

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Blue Sea 5204 AGC® Glass Tube Fuse, 1A, 5/pk

$7.69 - $7.69

$7.69

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$7.69

Item locally warehoused

The Blue Sea 5204 AGC® glass tube fuse is a fast-acting, corrosion-resistant fuse with a visible blown-condition indication. Sold as 5 fuses per pa...

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$7.69

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Fuse JJN (Class T) 400 Amp

$133.09 - $133.09

$133.09

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$133.09

Item locally warehoused

Protect demanding DC electrical circuits with a fast-acting Class T fuse designed for high-amperage electronics equipment. Ideal where quick short-...

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$133.09 - $133.09

$133.09

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Blue Sea 5245100 Fuse ATO/ATC 30 Amp 25/Pk

$40.89 - $40.89

$40.89

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$40.89

Item locally warehoused

Blue Sea Systems 5245100 is a 30 Amp ATO/ATC style fast-acting blade fuse (25-pack) designed for DC circuit protection in marine and automotive 12V...

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$40.89 - $40.89

$40.89

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$40.89

Fuse JJN (Class T) 350 Amp

$149.99 - $149.99

$149.99

$149.99 - $149.99

$149.99

Item locally warehoused

Protect high-amperage DC electronics with a Blue Sea Systems Class T fuse designed for extremely fast short-circuit response. The 350 Amp rating an...

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$149.99 - $149.99

$149.99

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$149.99

Blue Sea 5245 Fuse ATO/ATC 30 Amp 2/Pk

$6.79 - $6.79

$6.79

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$6.79

Item locally warehoused

Blue Sea 5245 ATO/ATC 30 Amp fast-acting fuse pair (2/pk) for DC circuit protection in automotive and marine-style 12V systems. Tin-plated connecto...

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$6.79 - $6.79

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Fuse JJN (Class T) 300 Amp

$133.09 - $133.09

$133.09

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$133.09

Item locally warehoused

The Fuse JJN (Class T) 300 Amp is a very fast-acting, high-interrupt-capacity fuse designed for reliable DC short-circuit protection in demanding p...

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$133.09 - $133.09

$133.09

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$133.09

Blue Sea 5244100 Fuse ATO/ATC 25 Amp 25/Pk

$40.89 - $40.89

$40.89

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$40.89

Item locally warehoused

Blue Sea Systems 5244100 is a 25 Amp ATO/ATC-style fast-acting fuse in a 25-pack, designed for 32V DC marine, RV, and other electrical protection a...

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$40.89 - $40.89

$40.89

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$40.89

Fuse JJN (Class T) 250 Amp

$133.09 - $133.09

$133.09

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$133.09

Item locally warehoused

Protect high-amperage DC electronics circuits with a Class T fuse built for fast short-circuit response. Rated for 250 Amp and certified for high i...

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$133.09 - $133.09

$133.09

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$133.09

Blue Sea 5244 Fuse ATO/ATC 25 Amp 2/Pk

$6.79 - $6.79

$6.79

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$6.79

Item locally warehoused

Blue Sea Systems 5244 is a fast-acting ATO/ATC blade fuse set designed for reliable DC circuit protection in automotive, truck, and marine-style el...

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$6.79

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Blue Sea Terminal Fuse, 300 Amp, Gray

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$35.09

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Item locally warehoused

Blue Sea MRBF Terminal Fuse 300A (Gray) provides space-saving, ignition-protected DC main circuit protection with a clear window for quick visual i...

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$35.09

Fuse JJN (Class T) 225 Amp

$133.09 - $133.09

$133.09

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$133.09

Item locally warehoused

Protect demanding DC power systems with a fast-acting Class T fuse rated 225 Amp, built for high interrupt capacity and quick short-circuit respons...

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$133.09 - $133.09

$133.09

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$133.09

Blue Sea Terminal Fuse, 250 Amp, Pink

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$35.09

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$35.09

Item locally warehoused

Blue Sea Systems MRBF Terminal Fuse (250 Amp) in Pink provides marine-grade DC main circuit protection with ignition protection and a clear window ...

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Fuses

Marine Fuses, Fuse Blocks & Circuit Protection

Match the Fuse to the Wire and Circuit

Do Not Upsize a Fuse to Stop Nuisance Blowing

High-Current Fuses

Blade Fuses

Breakers

Check the Holder, Terminals, and Heat Marks

Protect Power Close to the Source

Build the Circuit Around the Protection

Marine Fuse Questions

Shop Marine Fuses, Holders, Blocks & Circuit Protection

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