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.
Protection Check
Shop Fuse Holders
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
Marine FusesReplacement fuses by style and amperage Fuse BlocksOrganized branch-circuit protection Fuse HoldersInline and panel-mount holders ANL FusesHigh-current battery and inverter circuits MIDI FusesCompact high-current protection ATO/ATC FusesCommon blade fuses for DC panels Battery Terminal FusesProtection close to the battery source Circuit BreakersResettable protection and switching Bus BarsClean power distribution points
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.
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.
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.
FUSE ATO/ATC 5 AMP 2/PK
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FUSE ATO/ATC 5 AMP 2/PK
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FUSE HOLDER 3AG H20PROOF KNOW
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FUSE HOLDER 3AG H20PROOF KNOW
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FUSE ATO/ATC 20 AMP 2/PK
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FUSE ATO/ATC 20 AMP 2/PK
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Seachoice Round Panel-Mount Fuse Holder — 1/4" x 1-1/4" AGC, Bulk
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Seachoice Round Panel-Mount Fuse Holder — 1/4" x 1-1/4" AGC, BulkA compact, round panel-mount fuse holder designed for clean, permanent installatio...
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RELiON OUTLAWUS LiFePO4 Lithium Iron Phosphate 12V Battery
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RELiON Outlaw 1072S LiFePO4 Portable Power Station – OUTLAW-US Product Description The RELiON Outlaw 1072S is a portable lithium power station buil...
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Blue Sea Systems 250A Class T Fuse – BSS-5118
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250A Class T Fuse for Marine High-Current DC SystemsHeavy-duty overcurrent protection for large marine DC systems. This 250-amp Class T fuse is des...
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Blue Sea Systems 400A Class T Fuse – BSS-5121
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400A Class T Fuse for Marine High-Current DC SystemsMaximum-rated overcurrent protection for the heaviest DC loads on board. This 400-amp Class T f...
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Blue Sea Systems 50A MAXI Blade Fuse – BSS-5140
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50A MAXI Blade Fuse for Marine High-Current DC CircuitsHeavy-duty overcurrent protection for high-current marine DC circuits in the MAXI blade fuse...
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Blue Sea Systems 40A ANL Fuse – BSS-5165
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40A ANL Fuse for Marine High-Current DC CircuitsReliable overcurrent protection for mid-to-high-current marine DC circuits in the ANL fuse format. ...
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Blue Sea Systems 150A AGC High-Current Fuse – BSS-5185
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150A AGC High-Current Fuse for Marine DC SystemsHeavy-duty overcurrent protection for high-current marine DC circuits. This 150-amp AGC fuse is des...
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Blue Sea Systems 0.25A AGC Glass Tube Fuse – 5 Pack (BSS-5201)
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0.25A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsThe finest overcurrent protection in the AGC glass tube fuse range. This 5-pack of quarter...
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Blue Sea Systems 0.5A AGC Glass Tube Fuse – 5 Pack (BSS-5202)
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0.5A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsUltra-precision overcurrent protection for the most sensitive low-draw marine DC circuits i...
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Blue Sea Systems 1A AGC Glass Tube Fuse – 5 Pack (BSS-5204)
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1A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsMaximum precision overcurrent protection for the most sensitive low-draw marine DC circuits i...
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Blue Sea Systems 1.5A AGC Glass Tube Fuse – 5 Pack (BSS-5205)
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1.5A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsUltra-precise overcurrent protection for the most sensitive low-draw marine DC circuits in ...
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Blue Sea Systems 2A AGC Glass Tube Fuse – 5 Pack (BSS-5206)
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2A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsPrecise overcurrent protection for ultra-low-draw marine DC circuits in the AGC glass tube fo...
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Blue Sea Systems 3A AGC Glass Tube Fuse – 5 Pack (BSS-5208)
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3A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsReliable overcurrent protection for low-draw marine DC circuits in the AGC glass tube format....
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Blue Sea Systems 3A AGC Glass Tube Fuse – 25 Pack (BSS-5208100)
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3A AGC Glass Tube Fuse – 25 Pack for Marine DC CircuitsStock up and save with this bulk 25-pack of 3-amp AGC glass tube fuses. Ideal for marine ser...
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Blue Sea Systems 10A AGC Glass Tube Fuse – 5 Pack (BSS-5215)
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10A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsDependable overcurrent protection for low-to-mid-draw marine DC circuits in the AGC glass tu...
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Blue Sea Systems 15A AGC Glass Tube Fuse – 5 Pack (BSS-5217)
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15A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsReliable overcurrent protection for mid-draw marine DC circuits using the AGC glass tube for...
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Blue Sea Systems 25A AGC Glass Tube Fuse – 5 Pack (BSS-5219)
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25A AGC Glass Tube Fuse – 5 Pack for Marine DC CircuitsKeep your AGC fuse holders stocked and your circuits protected with this 5-pack of 25-amp AG...
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Blue Sea Systems 1A ATO/ATC Blade Fuse – BSS-5235
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1A ATO/ATC Blade Fuse for Marine DC CircuitsUltra-low-draw protection for your most sensitive onboard electronics. This 1-amp ATO/ATC blade fuse is...
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Blue Sea Systems 4A ATO/ATC Blade Fuse – BSS-5238
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4A ATO/ATC Blade Fuse for Marine DC CircuitsPrecision overcurrent protection for your most sensitive onboard electronics. This 4-amp ATO/ATC blade ...
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Blue Sea Systems 5A ATO/ATC Blade Fuse – BSS-5239
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5A ATO/ATC Blade Fuse for Marine DC CircuitsA dependable 5-amp ATO/ATC blade fuse for protecting low-draw marine DC circuits. The standard ATO/ATC ...
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Blue Sea Systems 25A ATO/ATC Blade Fuse – BSS-5244
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25A ATO/ATC Blade Fuse for Marine DC CircuitsA reliable 25-amp ATO/ATC blade fuse for protecting marine DC circuits. The standard ATO/ATC form fact...
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Blue Sea Systems 80A MIDI Fuse – 2 Pack (BSS-5255)
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80A MIDI Fuse – 2 Pack for Marine DC Circuit ProtectionProtect your mid-range DC circuits with these 80-amp MIDI fuses. Sold as a 2-pack, you get a...
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Blue Sea Systems 100A MIDI Fuse – 2 Pack (BSS-5256)
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100A MIDI Fuse – 2 Pack for Marine DC Circuit ProtectionKeep your high-current DC circuits protected with these 100-amp MIDI fuses. Sold as a 2-pac...
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Sea-Dog Hi-Amp Panel Mount Resettable Circuit Breaker 150A, 48 Volts
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Sea-Dog Hi-Amp panel mount resettable circuit breaker (single pole, thermal type) for 48VDC systems. Designed to provide a visible indication when ...
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Sea-Dog 4208851 Hi-Amp Panel Mount Resettable Circuit Breaker 70A, 48 Volts
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The Sea-Dog 4208851 Hi-Amp panel mount resettable circuit breaker provides overcurrent protection with a visible indication of a tripped condition—...
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Sea-Dog 4208821 Hi-Amp Panel Mount Resettable Circuit Breaker 40A, 48 Volts
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The Sea-Dog 4208821 Hi-Amp panel mount resettable circuit breaker is a single-pole thermal type breaker designed for 48VDC systems. It includes a v...
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Sea-Dog Hi-Amp Panel Mount Resettable Circuit Breaker 120A, 48 Volts
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Sea-Dog Hi-Amp panel mount resettable circuit breaker for 48V systems, providing overcurrent protection with a visible indication when tripped. Key...
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Sea-Dog 4208841 Hi-Amp Panel Mount Resettable Circuit Breaker 60A, 48 Volts
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Sea-Dog 4208841 Hi-Amp Panel Mount Resettable Circuit Breaker is a single-pole thermal, push-to-reset breaker designed for 48VDC marine electrical ...
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Sea-Dog 4208811 Hi-Amp Panel Mount Resettable Circuit Breaker 30A, 48 Volts
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The Sea-Dog 4208811 Hi-Amp panel mount resettable circuit breaker provides a visible indication of a tripped condition, with a 30A rating and 48VDC...
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Sea-Dog Hi-Amp Panel Mount Resettable Circuit Breaker 100A, 48 volts
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The Sea-Dog Hi-Amp panel mount resettable circuit breaker is a single-pole thermal breaker designed to protect 48VDC marine electrical circuits. It...
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Sea-Dog 4208861 Hi-Amp Panel Mount Resettable Circuit Breaker 80A, 48 Volts
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Sea-Dog 4208861 Hi-Amp panel-mount resettable circuit breaker (80A, 48 Volts) provides a visible indication when a circuit has tripped. Built as a ...
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Sea-Dog 4208801 Hi-Amp Panel Mount Resettable Circuit Breaker 25A, 48 volts
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Sea-Dog 4208801 Hi-Amp panel mount resettable circuit breaker (25A, 48 volts) is a single-pole thermal breaker designed for marine-style installati...
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Sea-Dog 4208831 Hi-Amp Panel Mount Resettable Circuit Breaker 50A, 48 Volts
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The Sea-Dog 4208831 Hi-Amp panel-mount resettable circuit breaker helps protect 48VDC boat electrical circuits while providing a visible indication...
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Sea-Dog 4208761 Hi-Amp Surface Mount Resettable Circuit Breaker, 80 amps, A=2-7/8" B=1-7/8" C=1-3/4" D=2-3/16" E=1-1/16", 48 Volts
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The Sea-Dog 4208761 Hi-Amp surface mount resettable circuit breaker (80 amps, 48 volts) helps protect DC accessory circuits in demanding marine env...
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Sea-Dog 4208741 Hi-Amp Surface Mount Resettable Circuit Breaker, 60 amps, A=2-7/8" B=1-7/8" C=1-3/4" D=2-3/16" E=1-1/16", 48 Volts
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Current price
$83.29
Item locally warehoused
Protect DC accessories with the Sea-Dog 4208741 Hi-Amp surface mount resettable circuit breaker. This single-pole thermal breaker is designed for m...
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Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Sea-Dog 4208701 Hi-Amp Surface Mount Resettable Circuit Breaker, 25 amps, A=2-7/8" B=1-7/8" C=1-3/4" D=2-3/16" E=1-1/16", 48 Volts
Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Item locally warehoused
The Sea-Dog 4208701 Hi-Amp Surface Mount Resettable Circuit Breaker is a 25-amp, single-pole thermal breaker designed for 48 volts. It mounts on th...
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Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Sea-Dog 4208731 Hi-Amp Surface Mount Resettable Circuit Breaker, 50 amps, A=2-7/8" B=1-7/8" C=1-3/4" D=2-3/16" E=1-1/16", 48 Volts
Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Item locally warehoused
Sea-Dog Hi-Amp Surface Mount Resettable Circuit Breaker 4208731 is a single-pole thermal resettable breaker designed to provide a visible indicatio...
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Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Sea-Dog 4208711 Hi-Amp Surface Mount Resettable Circuit Breaker, 30 amps, A=2-7/8" B=1-7/8" C=1-3/4" D=2-3/16" E=1-1/16", 48 Volts
Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Item locally warehoused
The Sea-Dog 4208711 Hi-Amp Surface Mount Resettable Circuit Breaker (30 amps, 48 volts) is a single-pole, thermal-type overcurrent protection devic...
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Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Sea-Dog 4208751 Hi-Amp Surface Mount Resettable Circuit Breaker, 70 amps, A=2-7/8" B=1-7/8" C=1-3/4" D=2-3/16" E=1-1/16", 48 Volts
Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Item locally warehoused
Keep your 48V marine electrical circuits protected with the Sea-Dog Hi-Amp Surface Mount Resettable Circuit Breaker (70A). This single-pole, therma...
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Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Sea-Dog 4208721 , Hi-Amp Surface Mount Resettable Circuit Breaker, 40 amps, A=2-7/8" B=1-7/8" C=1-3/4" D=2-3/16" E=1-1/16", 48 Volts
Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
-
$83.29
Current price
$83.29
Item locally warehoused
The Sea-Dog 4208721 Hi-Amp Surface Mount Resettable Circuit Breaker is a single-pole, thermal resettable breaker designed to provide a visible indi...
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Original price
$83.29
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Original price
$83.29
Original price
$83.29
$83.29
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$83.29
Current price
$83.29
Circuit Breaker Aa1 25 Amp White
Original price
$51.99
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Original price
$51.99
Original price
$51.99
$51.99
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$51.99
Current price
$51.99
Item locally warehoused
The LNS/Blue Sea Systems A-Series AA1 25 Amp White single-pole circuit breaker is a magnetic-hydraulic, trip-free breaker designed to combine on/of...
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Original price
$51.99
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Original price
$51.99
Original price
$51.99
$51.99
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$51.99
Current price
$51.99
Circuit Breaker Aa1 20A White
Original price
$51.99
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Original price
$51.99
Original price
$51.99
$51.99
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$51.99
Current price
$51.99
Item locally warehoused
A single-pole 20A A-Series toggle circuit breaker in white from Blue Sea Systems—designed to provide both switching and overcurrent protection in o...
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Original price
$51.99
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Original price
$51.99
Original price
$51.99
$51.99
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$51.99
Current price
$51.99
Circuit Breaker Aa1 30 Amp Black
Original price
$51.99
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Original price
$51.99
Original price
$51.99
$51.99
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$51.99
Current price
$51.99
Item locally warehoused
Blue Sea Systems A-Series AA1 single-pole circuit breaker (black) combines switching and circuit protection in one compact device. It’s a magnetic-...
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Original price
$51.99
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Original price
$51.99
Original price
$51.99
$51.99
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$51.99
Current price
$51.99
Blue Sea Systems A-Series DC Double Pole Toggle Circuit Breaker
Original price
$119.89
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Original price
$119.89
Original price
$119.89
$119.89
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$119.89
Current price
$119.89
Item locally warehoused
Blue Sea Systems A-Series DC Double Pole Toggle Circuit Breaker is a magnetic-hydraulic, trip-free breaker designed to combine switching and circui...
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Original price
$119.89
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Original price
$119.89
Original price
$119.89
$119.89
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$119.89
Current price
$119.89
Blue Sea A-Series Flat Rocker Circuit Breaker, Single Pole Flat, 30 amps
Original price
$58.89
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Original price
$58.89
Original price
$58.89
$58.89
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$58.89
Current price
$58.89
Item locally warehoused
The Blue Sea A-Series Flat Rocker Circuit Breaker (Single Pole Flat, 30 amps) is designed to help prevent accidental switching while providing magn...
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Original price
$58.89
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Original price
$58.89
Original price
$58.89
$58.89
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$58.89
Current price
$58.89