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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 ShopFitmentFuse TypesInspectionInstall NotesFAQCircuit BreakersBus Bars

Fitment

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.

Shop Fuses Fuse Blocks Circuit Breakers

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Seadog 4208301 Thermal Breaker 30 Amp

Seadog 4208301 Thermal Breaker 30 Amp

$9.70 - $9.70
$9.70
$9.70 - $9.70
$9.70
In stock

Thermal AC/DC Circuit Breakers are constructed of molded Bakelite with stamped brass contacts. Used to protect an electrical circuit from damage ca...

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$9.70 - $9.70
$9.70
$9.70 - $9.70
$9.70
Seadog 4208151 Thermal Breaker 15 Amp

Seadog 4208151 Thermal Breaker 15 Amp

$8.83 - $8.83
$8.83
$8.83 - $8.83
$8.83
In stock

Thermal AC/DC Circuit Breakers are constructed of molded Bakelite with stamped brass contacts. Used to protect an electrical circuit from damage ca...

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$8.83 - $8.83
$8.83
$8.83 - $8.83
$8.83
Sierra FS84230 Marine Rated Battery Fuse, 300A, Grey

Sierra FS84230 Marine Rated Battery Fuse, 300A, Grey

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84220 Marine Rated Battery Fuse, 250A, Pink

Sierra FS84220 Marine Rated Battery Fuse, 250A, Pink

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84210 Marine Rated Battery Fuse, 200A, Blue

Sierra FS84210 Marine Rated Battery Fuse, 200A, Blue

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84200 Marine Rated Battery Fuse, 175A, White

Sierra FS84200 Marine Rated Battery Fuse, 175A, White

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84190 Marine Rated Battery Fuse, 150A, Orange

Sierra FS84190 Marine Rated Battery Fuse, 150A, Orange

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84170 Marine Rated Battery Fuse, 100A, Yellow

Sierra FS84170 Marine Rated Battery Fuse, 100A, Yellow

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84140 Marine Rated Battery Fuse, 75A, Brown

Sierra FS84140 Marine Rated Battery Fuse, 75A, Brown

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84120 Marine Rated Battery Fuse, 50A, Red

Sierra FS84120 Marine Rated Battery Fuse, 50A, Red

$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
In stock

Fits onto the positive battery stud providing circuit protection directly from the power source. Ignition protected when used with Sierra MRBF Fuse...

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$27.99 - $27.99
$27.99
$27.99 - $27.99
$27.99
Sierra FS84020 FMX Fuse, 40A, Green

Sierra FS84020 FMX Fuse, 40A, Green

$22.59 - $22.59
$22.59
$22.59 - $22.59
$22.59
In stock

Fast Acting and cost effective high current automotive fuses for use in battery and general DC application.Electrical Specification: Max Voltage Ra...

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$22.59 - $22.59
$22.59
$22.59 - $22.59
$22.59
Sierra FS84010 FMX Fuse, 30A, Pink

Sierra FS84010 FMX Fuse, 30A, Pink

$22.59 - $22.59
$22.59
$22.59 - $22.59
$22.59
In stock

Fast Acting and cost effective high current automotive fuses for use in battery and general DC application.Electrical Specification: Max Voltage Ra...

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$22.59 - $22.59
$22.59
$22.59 - $22.59
$22.59

Sierra FS82070 ANL Fuse, 400 Amp

$93.99 - $93.99
$93.99
$93.99 - $93.99
$93.99
In stock

Ceramic body for superior insulation Brass, gold-plated elements for superb electrical contact Ignition Protected (ISO8846) 100% Rating: 4 Hours M...

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$93.99 - $93.99
$93.99
$93.99 - $93.99
$93.99

Sierra FS82060 ANL Fuse, 350 Amp

$94.09 - $94.09
$94.09
$94.09 - $94.09
$94.09
In stock

Ceramic body for superior insulation Brass, gold-plated elements for superb electrical contact Ignition Protected (ISO8846) 100% Rating: 4 Hours M...

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$94.09 - $94.09
$94.09
$94.09 - $94.09
$94.09

Sierra FS82050 ANL Fuse, 300 Amp

$86.99 - $86.99
$86.99
$86.99 - $86.99
$86.99
In stock

Ceramic body for superior insulation Brass, gold-plated elements for superb electrical contact Ignition Protected (ISO8846) 100% Rating: 4 Hours M...

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$86.99 - $86.99
$86.99
$86.99 - $86.99
$86.99

Sierra FS82040 ANL Fuse, 250 Amp

$86.99 - $86.99
$86.99
$86.99 - $86.99
$86.99
In stock

Ceramic body for superior insulation Brass, gold-plated elements for superb electrical contact Ignition Protected (ISO8846) 100% Rating: 4 Hours M...

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$86.99 - $86.99
$86.99
$86.99 - $86.99
$86.99

Sierra FS82030 ANL Fuse, 200 Amp

$76.29 - $76.29
$76.29
$76.29 - $76.29
$76.29
In stock

Ceramic body for superior insulation Brass, gold-plated elements for superb electrical contact Ignition Protected (ISO8846) 100% Rating: 4 Hours M...

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$76.29 - $76.29
$76.29
$76.29 - $76.29
$76.29
Seachoice 11298, 300 Amp Class T Fuse

Seachoice 11298, 300 Amp Class T Fuse

$65.04 - $65.04
$65.04
$65.04 - $65.04
$65.04
In stock

Very fast acting, current limiting Series combination ratings with branch circuit breakers allows broad range of coverage, independent of breaker ...

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$65.04 - $65.04
$65.04
$65.04 - $65.04
$65.04
Seachoice 11296, 225 Amp Class T Fuse

Seachoice 11296, 225 Amp Class T Fuse

$65.04 - $65.04
$65.04
$65.04 - $65.04
$65.04
In stock

Very fast acting, current limiting Series combination ratings with branch circuit breakers allows broad range of coverage, independent of breaker ...

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$65.04 - $65.04
$65.04
$65.04 - $65.04
$65.04
Seachoice 11294 300 Amp Marine Rated Battery Fuse

Seachoice 11294 300 Amp Marine Rated Battery Fuse

$30.01 - $30.01
$30.01
$30.01 - $30.01
$30.01
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$30.01 - $30.01
$30.01
$30.01 - $30.01
$30.01
Seachoice 11293 250 Amp Marine Rated Battery Fuse

Seachoice 11293 250 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Seachoice 11287 100 Amp Marine Rated Battery Fuse

Seachoice 11287 100 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Seachoice 11286 80 Amp Marine Rated Battery Fuse

Seachoice 11286 80 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary Circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

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$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Seachoice 11284 60 Amp Marine Rated Battery Fuse

Seachoice 11284 60 Amp Marine Rated Battery Fuse

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
In stock

These marine rated fuses are suitable for main and auxiliary circuit protection (alternator outputs, starter motor inputs and accessories) in deman...

View full details
$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31