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.
Choose fuse style and amp rating by the protected wire, circuit load, voltage, holder type, and manufacturer recommendations.
Electrical protection is safety-critical. Confirm fuse rating, wire gauge, interrupt rating, ignition protection, environment, and ABYC-style installation practices before servicing marine wiring.
Popular Fuse Searches
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.
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.
High-Current Fuses
ANL, Class T, MRBF, and MIDI styles are often used near batteries, chargers, windlasses, thrusters, and inverters.
Blade Fuses
ATO, ATC, and mini blade fuses are common in DC panels, accessory circuits, electronics, pumps, lights, and small loads.
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.
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.
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.
Filters
Blue Sea Systems 7040 187 Series DC Circuit Breaker - Panel Mount, 60 Amps
The Blue Sea Systems 7040 187 Series DC Circuit Breaker is a panel-mount breaker that combines switching and circuit protection in one rugged devic...
View full detailsBlue Sea Systems 7142 187 Series DC Circuit Breaker - Surface Mount, 80 Amps
Blue Sea Systems 7142 (187 Series) is a surface-mount, 80A DC circuit breaker designed to combine switching and circuit protection in a single devi...
View full detailsBlue Sea Systems 7149 187 Series DC Circuit Breaker - Surface Mount, 200 Amps
Blue Sea Systems 7149 187 Series DC Circuit Breaker provides combined switching and circuit protection in a rugged, surface-mount design for marine...
View full detailsBlue Sea Systems 7148 187 Series DC Circuit Breaker - Surface Mount, 150 Amps
The Blue Sea Systems 7148 187 Series DC Circuit Breaker is a surface-mount, 150-amp solution for DC circuit switching and overcurrent protection in...
View full detailsBlue Sea Systems 7146 187 Series DC Circuit Breaker - Surface Mount, 120 Amps
Blue Sea Systems 7146 is an 187 Series 120A DC thermal circuit breaker for surface-mount installations where you need both switching control and ci...
View full detailsBlue Sea Systems 7143 187 Series DC Circuit Breaker - Surface Mount, 90 Amps
Blue Sea Systems 7143 (187 Series) is a surface-mount DC circuit breaker designed for medium-duty protection where switching and circuit protection...
View full detailsBlue Sea Systems 7139 187 Series DC Circuit Breaker - Surface Mount, 50 Amps
Blue Sea Systems 7139 187 Series DC Circuit Breaker is a surface-mount breaker built for medium-duty DC circuit protection where both switching and...
View full detailsBlue Sea Systems 7136 187 Series DC Circuit Breaker - Surface Mount, 30 Amps
Blue Sea Systems 7136 187 Series DC Circuit Breaker is a surface-mount thermal breaker that combines dependable circuit protection with convenient ...
View full detailsBlue Sea Systems 7138 187 Series DC Circuit Breaker - Surface Mount, 40 Amps
Blue Sea Systems 7138 187 Series DC circuit breaker combines a single-lever switch function with thermal circuit protection for marine DC systems—h...
View full detailsBlue Sea Systems 7141 187 Series DC Circuit Breaker - Surface Mount, 70 Amps
When your DC system needs both switching and overcurrent protection in one rugged device, the Blue Sea Systems 7141 187 Series DC Circuit Breaker i...
View full detailsBlue Sea Systems 7036 187 Series DC Circuit Breaker - Panel Mount, 30 Amps
Blue Sea Systems 7036 187 Series DC Circuit Breaker is a panel-mount thermal breaker designed to provide both switching and circuit protection in o...
View full detailsBlue Sea Systems 285 Series DC Cirucit Breaker - Panel Mount
The Blue Sea Systems 285 Series DC Circuit Breaker (panel mount) provides medium-duty DC circuit protection with an integrated switching function—i...
View full detailsBlue Sea Systems 7135 187 Series DC Circuit Breaker - Surface Mount, 25 Amps
Blue Sea Systems 7135 187 Series DC Circuit Breaker provides switchable circuit protection in a surface-mount design. Built to meet SAE J1171 exter...
View full detailsBlue Sea Systems 7140 187 Series DC Circuit Breaker - Surface Mount, 60 Amps
Blue Sea Systems 7140 187 Series DC Circuit Breaker (surface mount) is built for medium-duty protection on 12V/24V/42V DC systems where you need bo...
View full detailsBlue Sea Systems 285 Series DC Cirucit Breaker - Panel Mount
Blue Sea Systems 285 Series DC Circuit Breaker (Panel Mount) provides medium-duty overload and fault protection in DC electrical systems where swit...
View full detailsBlue Sea 7067 ATO/ATC-Style Low Profile Circuit Breaker, 25A, White, 2/pk
Replace ATO/ATC fuse protection with a manually resettable, blade-style circuit breaker for more convenient troubleshooting and reset after overloa...
View full detailsBlue Sea Systems 285 Series DC Cirucit Breaker - Panel Mount
The Blue Sea Systems 285 Series DC Circuit Breaker (panel mount) is designed to provide medium-duty circuit protection for DC loads where both swit...
View full detailsBlue Sea 7066 ATO/ATC-Style Low Profile Circuit Breaker, 20A, Yellow, 2/pk
Upgrade an ATO/ATC blade-style fuse circuit with a manually resettable Blue Sea Systems 7066 circuit breaker. Designed in a low-profile form factor...
View full detailsBlue Sea Systems 285 Series DC Cirucit Breaker - Panel Mount
Blue Sea Systems 285 Series DC Circuit Breaker (Panel Mount) provides medium-duty circuit protection for 25 to 200 ampere loads in 48V DC systems w...
View full detailsBlue Sea Systems 285 Series DC Cirucit Breaker - Panel Mount
The Blue Sea Systems 285 Series DC Circuit Breaker (panel mount) provides medium-duty DC circuit protection for marine and off-grid DC power system...
View full detailsBlue Sea Systems 285 Series DC Cirucit Breaker - Panel Mount
The Blue Sea Systems 285 Series DC Circuit Breaker (panel mount) provides medium-duty circuit protection for DC loads when both switching and circu...
View full detailsBlue Sea Systems 285 Series DC Cirucit Breaker - Panel Mount
The Blue Sea Systems 285 Series DC Circuit Breaker (panel mount) provides medium-duty DC protection for loads—designed for applications where you n...
View full detailsBlue Sea 7065 ATO/ATC-Style Low Profile Circuit Breaker, 15A, Blue, 2/pk
Replace an ATO/ATC blade-style fuse with a manually resettable circuit breaker for protected, convenient circuit control. Key Features Drop-in rep...
View full detailsBlue Sea 7062 ATO/ATC-Style Low Profile Circuit Breaker, 5A, Light Brown, 2/pk
Replace an ATO or ATC blade-style fuse with a manually resettable, low-profile circuit breaker for marine electrical protection. This Blue Sea Syst...
View full detailsBlue Sea Systems 2141 Medium Duty Push Button Reset Only Circuit Breaker - 40A
The Blue Sea Systems 2141 Medium Duty Push Button Reset Only Circuit Breaker (40A) is a weatherproof, compact circuit protection device designed fo...
View full detailsBlue Sea St Clb Push Button Circuit Breaker Block
Blue Sea Systems ST CLB push button circuit breaker block (SKU 661-5052) is a marine-rated distribution block that makes it easy to install and ser...
View full detailsBlue Sea St Clb Push Button Circuit Breaker Block
The Blue Sea Systems ST/CLB push button circuit breaker block (SKU 661-5054) is a compact, snap-in-place DC distribution protection block designed ...
View full detailsBlue Sea St Clb Push Button Circuit Breaker Block
Blue Sea Systems ST-CLB push button circuit breaker block is a compact, surface-mount breaker block designed for circuit protection in marine-style...
View full detailsBlue Sea 7068 ATO/ATC-Style Low Profile Circuit Breaker, 30A, Green, 2/pk
Blue Sea Systems 7068 ATO/ATC-Style Low Profile Circuit Breaker replaces ATO/ATC blade-style fuses with a manually resettable breaker—ideal for com...
View full detailsBlue Sea 7063 ATO/ATC-Style Low Profile Circuit Breaker, 7.5A, Brown, 2/pk
Replace an ATO/ATC blade-style fuse with a manually resettable, low-profile circuit breaker from Blue Sea Systems. Designed for compact protection ...
View full detailsBlue Sea 7064 ATO/ATC-Style Low Profile Circuit Breaker, 10A, Red, 2/pk
Blue Sea Systems 7064 ATO/ATC-Style Low Profile circuit breaker provides manually resettable protection designed to drop into ATO/ATC blade-style f...
View full detailsToggle Guard
Protect your boat’s electrical circuit breakers from accidental switching with the Blue Sea Systems Toggle Guard (661-4100). Designed to shield the...
View full detailsSeadog 4208101 Thermal Circuit Breaker - 10 A
Protects a marine electrical circuit from excess current using a thermal, push-to-reset AC/DC circuit breaker—an economical alternative to magnetic...
View full detailsSeadog 4208201 Thermal Circuit Breaker - 20 A
Seadog 4208201 is a 20 A thermal AC/DC push-to-reset circuit breaker designed to protect your electrical circuits from excess current. It features ...
View full detailsCircuit Breaker (Resettable)
Sea-Dog Line inline resettable circuit breaker with manual reset button for protecting higher-amperage accessories. Designed for marine use and tes...
View full detailsCircuit Breaker w/Cover (Resettable)
LNS Sea-Dog Line inline resettable circuit breaker with manual reset button—built for marine accessory circuit protection with an included splash-p...
View full detailsCircuit Breaker (Resettable)
Sea-Dog Line inline resettable circuit breaker with a manual reset button, designed for marine DC power distribution protection on higher-amperage ...
View full detailsCircuit Breaker w/Cover (Resettable)
LNS/Sea-Dog Line resettable inline circuit breaker with a manual reset button and included splash-resistant breaker cover—designed to protect highe...
View full detailsDigital Circuit Breaker w/Display
Get precise, digital circuit protection with a built-in display. This TRAC digital circuit breaker monitors voltage and current in real time and in...
View full detailsCircuit Breaker (Resettable)
Inline Resettable Circuit Breakers with manual reset button are for use with higher amperage accessories. These breakers are ignition protected and...
View full detailsSierra CB41210 Push Button Circuit Breaker, 10 Amp, White
The Sierra CB41210 push button circuit breaker is a panel-mounted, resettable protection device rated at 10 amps with a white push button for DC ci...
View full detailsSierra CB41220 Push Button Circuit Breaker, 15 Amp, White
Replace a panel-mounted DC circuit breaker with the Sierra CB41220 push-button style breaker. Designed for a 3/8" mounting hole, this 15 Amp breake...
View full detailsSeachoice AC/DC Panel Breaker With Single White Actuator
The Seachoice AC/DC panel breaker with a single white actuator is a marine-rated circuit protection device designed for AC/DC applications. It prov...
View full detailsSeachoice AC/DC Panel Breaker With Single White Actuator
AC/DC Circuit Breaker, 30 Amp, White
Circuit Breaker w/Cover (Resettable)
The LNS/Sea-Dog Line inline resettable circuit breaker with manual reset button helps protect higher-amperage marine accessories, with ignition-pr...
View full detailsCircuit Breaker w/Cover (Resettable)
LNS Sea-Dog Line inline resettable circuit breaker with manual reset button and splash-proof Breaker Cover. Built for ignition-protected marine ele...
View full detailsSeachoice AC/DC Panel Breaker With Single White Actuator
Seachoice AC/DC panel breaker with a single white actuator for clear, simple operation in marine electrical systems. Key Features AC/DC circuit br...
View full detailsSeachoice AC/DC Panel Breaker With Single White Actuator
Seachoice AC/DC panel breaker (Single Pole) with a white single actuator—designed for marine electrical protection and panel mounting. Key Features...
View full details