Blue Sea ST Blade Fuse Compact 4-Circuit Fuse Block with Insulating Cover
Blue Sea ST Blade Fuse Compact 4-Circuit Fuse Block with Insulating Cover
Single-Side Wire Entry - Tin-Plated Copper - Ignition Protected

DESCRIPTION
Space-Saving 4-Way Circuit Protection for Marine, 4WD, and Off-Grid Electrical Systems
Organising DC power distribution in confined spaces requires hardware engineered for both spatial efficiency and electrical reliability. The Blue Sea Systems ST Blade Compact 4-Circuit Fuse Block provides consolidated circuit protection for standard ATO and ATC blade fuses. Designed specifically for tight installation footprints in marine vessels, 4WD canopies, caravans, and commercial vehicles, this surface-mount block streamlines wiring layouts while maintaining strict safety compliance.
Single-Side Wire Entry for Tight Mounting Locations
Traditional fuse blocks often require wiring clearances on both sides of the unit, increasing the overall installation footprint. This compact model features a dedicated single-side wire entry design, allowing the positive feed and all four load outputs to enter from the same direction. This configuration lets installers mount the block flush against bulkheads, walls, or adjacent electrical components, maximising usable space inside cramped electrical cabinets or under-dash areas. The unit accepts standard ring or snap-fork type terminals, providing secure mechanical retention against harsh off-road vibrations and heavy sea states.
Marine-Grade Construction and Ignition Protection
Unprotected copper components in humid or coastal environments rapidly oxidise, leading to voltage drop, heat build-up, and intermittent circuit failure. To mitigate these risks, this fuse block is constructed with high-conductivity, tin-plated copper bus bars and fuse clips. The tin plating resists corrosion in harsh marine and automotive environments, maintaining optimal power transfer over the lifespan of the system.
For installations in sensitive areas, the included translucent insulating cover satisfies ABYC and USCG insulation requirements. When the cover is securely latched in place, the fuse block meets ISO 8846 and SAE J1171 standards for ignition protection, making it suitable for installation within petrol engine compartments and fuel storage areas.
Key Features and Benefits
- Single-Side Wire Entry: Consolidates all wiring to one side of the block, minimising the overall mounting footprint in restricted spaces.
- Corrosion-Resistant Materials: Tin-plated copper bus bars and fuse clips deliver reliable conductivity and minimize resistance in marine and humid climates.
- Certified Ignition Protection: Complies with ISO 8846 and SAE J1171 standards for safe use in petrol engine compartments when the insulating cover is secured.
- ABYC and USCG Compliant: Clear insulating cover prevents accidental short circuits from loose wires or falling tools while allowing rapid visual fuse inspection.
- Secure Terminal Compatibility: Accommodates standard ring and snap-fork terminals for dependable, vibration-resistant wire terminations.
- System Organisation: Includes four write-on circuit labels for clear, compliant identification of connected loads during maintenance or troubleshooting.
Practical Applications and Installation Notes
Whether you are wiring auxiliary lighting on a 4WD, installing navigation electronics on a boat, or adding dedicated circuits to a camper trailer, the ST Blade Compact series offers a professional distribution hub. It replaces messy inline fuse holders mounted directly to battery terminals, significantly reducing clutter and simplifying fault finding.
Please note: ATO and ATC blade fuses are sold separately, allowing you to select the exact amperage ratings required for your specific load wiring.
Upgrade Your DC Power Distribution
Select the Blue Sea ST Blade Compact 4-Circuit Fuse Block to establish a safe, organised, and compliant electrical distribution point for your marine, automotive, or off-grid power system.
SKU: BS-5045B
SPECIFICATIONS
| Specification | Details |
|---|---|
| Product type | Fuse block |
| Number of circuits | 4 |
| Mounting | Surface mount |
| Compatible fuse formats | ATO and ATC |
| Cover | Insulating cover included; meets ABYC/USCG insulation requirements |
| Bus bars and fuse clips | Tin-plated copper |
| Terminals | Accepts ring or snap-fork type terminals |
| Wire entry | Single-side entry |
| Ignition protection | When the cover is secure; meets ISO 8846 and SAE J1171 for use in a gasoline engine compartment |
| Circuit labels | 4 write-on labels included |
| Fuses | Sold separately |
| SKU: | BS-5045B |
| Model #: | BS-5045B |
| MPN: | BS-5045B |
| HS code: | 8536908585 |
| Country of origin: | MX |
| Package weight: | 0.144 kg |
| Package length: | 0.12 m |
| Package width: | 0.1 m |
| Package height: | 0.06 m |
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.

