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Blue Sea 12 Circuits Blade Fuse Block/Holder w/ Negative Bus & Cover
Blue Sea 12 Circuits Blade Fuse Block/Holder w/ Negative Bus & Cover
100A Max - 32V DC - Cover & Negative Bus - Marine Grade
Key features: Transparent insulating cover with label slots, Positions for 12 blade fuses, Integrated negative bus bar, Corrosion-resistant screw terminals.Highlights:Cover Latch: Yellow push-button latch for secure cover retention and easy access,Negative Bus: Integrated negative bus bar with screw terminals for circuit returns,Label Recesses: Dedicated spaces on the cover for circuit identification labels,Insulating Cover: Clear plastic cover protects fuses and meets safety requirements,Blade Fuses: Accepts standard ATO/ATC blade fuses up to 30A per circuit.
Dimensions: 164.39mm height x 84.20mm width x 38.57mm depth. Mounting holes are spaced 138.66mm vertically and 63.50mm horizontally.Highlights:Negative Bus: Integrated negative bus bar with #8-32 screws,Circuit Terminals: Screw terminals for 12 independent circuits,Mounting Holes: Mounting points for #8 or M4 screws. 
Regular price
$97.00
Availability:
In Stock
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DESCRIPTION
Blue Sea Systems ST Blade Fuse Block: Centralised Power Distribution for Marine and RV Systems
Streamline Your 12V and 24V Electrical Systems
The Blue Sea Systems ST Blade Fuse Block (12 Circuits) is the industry standard for consolidating branch circuits in demanding mobile environments. Designed to eliminate the "rats' nest" of in-line fuses and messy wiring often found in boats, caravans, and 4WD canopies, this distribution block offers a professional, safe, and reliable solution for managing your DC electrical connections.
Engineered for 12V and 24V systems (rated up to 32V DC), this unit allows you to power up to 12 separate accessories—such as fridges, lighting, water pumps, and navigation electronics—from a single reliable source. With a maximum total amperage of 100A per block and 30A per circuit, it is robust enough to handle the power requirements of modern off-grid setups while ensuring specific circuits are protected against overcurrent faults.
Integrated Negative Bus for Simplified Wiring
One of the standout features of this model is the integrated negative bus. In many electrical installations, finding a clean and accessible location for return lines (grounding) can be a challenge, often leading to stacked terminals on battery posts. This fuse block includes a built-in negative bus with #10-32 (Approx. M5) stud terminals, allowing you to run both positive and negative wires to the same block.
This design not only saves significant installation time but also reduces the number of connections required, minimising voltage drop and potential failure points. It creates a compact, self-contained power hub that makes troubleshooting easier in the future.
Marine-Grade Durability and ABYC Compliance
Built to withstand harsh saltwater and outdoor environments, the unit features tin-plated copper buses and fuse clips. This plating provides superior corrosion resistance compared to bare copper, ensuring consistent conductivity over the life of the vessel or vehicle. The base is constructed from reinforced polycarbonate, offering excellent heat resistance and strength.
The included insulating cover is designed to satisfy ABYC and USCG requirements for electrical insulation, protecting the fuses from accidental short circuits. The cover features an easy-to-open push-button latch, storage space for two spare fuses, and label recesses that accept Blue Sea Systems' Small Format Labels (sold separately), ensuring your system is clearly identified and compliant.
Key Features
- 12 Independent Circuits: consolidate varying loads into one central hub
- Integrated Negative Bus: simplifies wiring by providing a central ground point
- High Current Rating: Supports 100A total continuous current and 30A per circuit
- Corrosion Resistant: Tin-plated copper components for marine longevity
- Safety Cover Included: Meets insulation requirements and stores spare fuses
- Wide Voltage Range: Suitable for 12V and 24V DC systems (Max 32V DC)
Installation and Technical Context
This fuse block is designed for versatility. It accepts standard ATO® and ATC® fast-acting blade fuses, which are widely available and easy to replace. The main positive distribution bus utilises a #10-32 (Approx. M5) stud, while the branch circuits use #8-32 (Approx. M4) screws with captive star lock washers to ensure secure connections even under vibration.
*Note: While rated for 100A maximum, typical de-rating factors apply based on ambient temperature and wire sizing. Ensure your supply cable is fused appropriately at the battery source.
Whether you are refitting a yacht or building a custom 12V system for a camper trailer, the Blue Sea Systems 5026 fuse block delivers the reliability and organization required for professional-grade electrical installations.
Secure Your Electrical System
Upgrade to the Blue Sea Systems 12 Circuit ST Blade Fuse Block today for a safer, cleaner, and more reliable power distribution system in your boat or vehicle.
SPECIFICATIONS
Specifications
| Circuits | 12 |
|---|---|
| Maximum Amperage |
100A per block 30A per circuit |
| Maximum Voltage | 32V DC |
| Mounting |
#8 Screw (M4) (approx. #8 major diameter 4.17 mm; M4 is 4 mm; reference only) |
| Negative Bus |
#10-32 Stud (approx. #10 major diameter 4.83 mm, 32 TPI ≈ 0.79 mm pitch; reference only) |
| Positive Bus |
#10-32 Stud (approx. #10 major diameter 4.83 mm, 32 TPI ≈ 0.79 mm pitch; reference only) |
| Recommended Torque |
24 in-lb (2.71 N·m) (approx. 2.0 ft-lb; reference only) |
| Screw Terminal Torque |
18 in-lb (2.03 N·m) (approx. 1.5 ft-lb; reference only) |
| Screw Terminal Type |
#8-32 Screws with captive star lock washer (approx. #8 major diameter 4.17 mm, 32 TPI ≈ 0.79 mm pitch; reference only) |
| Weight (min / max) |
0.75–0.75 lb (0.34–0.34 kg) (approx. 340 g; reference only) |
| SKU: | BS-5026B |
| Barcode: | 632085050269 |
| Model #: | BS-5026B |
| MPN: | BS-5026B |
WARRANTY
Blue Sea Warranty Policy
Blue Sea Systems products sold by us are supplied with a warranty against defects for the warranty period shown below, subject to the product type, application and the terms of this warranty policy.
The express warranty provided by us is limited to a maximum of 5 years from the original date of purchase, unless otherwise required under Australian Consumer Law.
Blue Sea Systems may offer longer manufacturer support on some products at their discretion
Warranty Lengths by Product Range
| Blue Sea Product Range | Warranty Length | Application / Notes |
|---|---|---|
| Most Blue Sea Systems Products | 5 years | Applies to most Blue Sea Systems products found to be defective in materials or manufacture. |
| P12 Battery Chargers | 5 years | Warranty period starts from the original date of purchase. |
| P12 Remote Displays | 5 years | Warranty period starts from the original date of purchase. |
| Digital Meters | 3 years | Warranty period starts from the original date of purchase. |
| Vessel System Monitors | 3 years | Warranty period starts from the original date of purchase. |
Warranty Assessment and Remedy
If a Blue Sea Systems product is found to be defective in materials or manufacture within the applicable warranty period, we will, at our discretion, arrange a repair, replacement, store credit or refund, depending on the nature of the fault and the requirements of Australian Consumer Law.
Products may need to be returned for assessment before a warranty claim can be approved. Where required, the product must be returned with dated proof of purchase and a clear description of the fault.
Labour costs for removing, replacing, reinstalling or diagnosing a product are not covered by this express warranty unless otherwise required under Australian Consumer Law.
Making a Warranty Claim
To make a warranty claim, please contact us with your dated proof of purchase, product details and a description of the fault.
The product may need to be returned for inspection before the claim can be assessed. If the product is confirmed to be faulty and covered by this warranty, we will advise the available remedy.
What This Warranty Does Not Cover
This warranty does not cover faults or damage caused by incorrect installation, incorrect application, misuse, abuse, neglect, unauthorised modification, accidental damage, normal wear and tear, environmental damage, or failure to use the product in accordance with the manufacturer's instructions.
- Incorrect installation or wiring
- Incorrect product selection or application
- Misuse, abuse or neglect
- Physical or accidental damage
- Water ingress or environmental damage outside the product's intended use
- Unauthorised modification or repair
- Normal wear and tear
- Labour costs for removal, replacement, reinstallation or diagnosis
- Freight, travel or call-out costs unless otherwise required by law
- Products not returned for assessment when reasonably required
Manufacturer Support
Blue Sea Systems may provide additional manufacturer support on some products beyond the warranty period listed above. Where available, we may assist customers in contacting the manufacturer, but any manufacturer support beyond the express warranty period is subject to the manufacturer's own terms and continued availability.
Australian Consumer Law
This warranty is in addition to other rights and remedies available at law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
