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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.

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

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

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
Fuse ANL 200 Amp

Fuse ANL 200 Amp

$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
Blue Sea 5217 AGC® Glass Tube Fuse, 15A, 5/pk

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

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
Fuse ANL 175 Amp

Fuse ANL 175 Amp

$61.99 - $61.99
$61.99
$61.99 - $61.99
$61.99
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$61.99 - $61.99
$61.99
$61.99 - $61.99
$61.99
Blue Sea 5215 AGC® Glass Tube Fuse, 10A, 5/pk

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

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
Blue Sea 5213 AGC® Glass Tube Fuse, 7.5A, 5/pk

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

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
Fuse ANL 150 Amp

Fuse ANL 150 Amp

$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
Blue Sea 5211 AGC® Glass Tube Fuse, 6A, 5/pk

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

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
Fuse ANL 130 Amp

Fuse ANL 130 Amp

$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
Fuse ANL 100 Amp

Fuse ANL 100 Amp

$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
Blue Sea 5210 AGC® Glass Tube Fuse, 5A, 5/pk

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

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
Blue Sea 5209 AGC® Glass Tube Fuse, 4A, 5/pk

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

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
Fuse ANL 80 Amp

Fuse ANL 80 Amp

$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
Blue Sea 5208 AGC® Glass Tube Fuse, 3A, 5/pk

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

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$9.69 - $9.69
$9.69
$9.69 - $9.69
$9.69
Fuse ANL 60 Amp

Fuse ANL 60 Amp

$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
Blue Sea 5207 AGC® Glass Tube Fuse, 2.5A, 5/pk

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

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
Fuse ANL 50 Amp

Fuse ANL 50 Amp

$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
In stock

Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Interrupt capacity is 6000 Amps DC and 32 volts DC max...

View full details
$58.39 - $58.39
$58.39
$58.39 - $58.39
$58.39
Blue Sea 5206 AGC® Glass Tube Fuse, 2A, 5/pk

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

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
Blue Sea 5246 Fuse ATO/ATC 40 Amp 2/Pk

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

$6.79 - $6.79
$6.79
$6.79 - $6.79
$6.79
In stock

Fast-acting type fuses ideal for electronic devices. Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. M...

View full details
$6.79 - $6.79
$6.79
$6.79 - $6.79
$6.79
Blue Sea 5204 AGC® Glass Tube Fuse, 1A, 5/pk

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

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
In stock

Fast-acting, corrosion resistant fuses. Visible indication of blown condition. 1/4" x 1-1/4".

$7.69 - $7.69
$7.69
$7.69 - $7.69
$7.69
Fuse JJN (Class T) 400 Amp

Fuse JJN (Class T) 400 Amp

$133.09 - $133.09
$133.09
$133.09 - $133.09
$133.09
In stock

Fast short circuit response makes this the best choice to protect high amperage electronics equipment such as inverters.20,000 Amp Interupt Capacit...

View full details
$133.09 - $133.09
$133.09
$133.09 - $133.09
$133.09
Blue Sea 5245100 Fuse ATO/ATC 30 Amp 25/Pk

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

$40.89 - $40.89
$40.89
$40.89 - $40.89
$40.89
In stock

Fast-acting type fuses ideal for electronic devices. Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. M...

View full details
$40.89 - $40.89
$40.89
$40.89 - $40.89
$40.89
Fuse JJN (Class T) 350 Amp

Fuse JJN (Class T) 350 Amp

$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
In stock

Fast short circuit response makes this the best choice to protect high amperage electronics equipment such as inverters.20,000 Amp Interupt Capacit...

View full details
$149.99 - $149.99
$149.99
$149.99 - $149.99
$149.99
Blue Sea 5245 Fuse ATO/ATC 30 Amp 2/Pk

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

$6.79 - $6.79
$6.79
$6.79 - $6.79
$6.79
In stock

Fast-acting type fuses ideal for electronic devices. Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. M...

View full details
$6.79 - $6.79
$6.79
$6.79 - $6.79
$6.79