Blue Sea Systems ST-Blade Battery Terminal Mount Fuse Block Kit, 4-Circuit, ATO/ATC, 32V DC, 30A Per Circuit

Overview

The Blue Sea Systems 5024 is a ST-Blade battery terminal mount fuse block kit for adding four fused branch circuits at the battery on DC systems up to 32V. It mounts on a 3/8 in. (M10) battery terminal stud, accepts ATO and ATC blade fuses, and is rated for 30A per circuit with 100A maximum per block.

This is a tidy way to add a few new accessory feeds without ending up with several inline fuse holders around the battery. The kit also includes a matching negative busbar, which helps keep return wiring organized when you are adding small DC loads close to the battery bank.

Key features

• Four fused ATO and ATC branch circuits for accessory distribution at the battery
• 30A maximum per circuit and 100A maximum per block
• 32V DC maximum operating voltage, which suits common 12V and 24V boat systems
• Mounts directly on a 3/8 in. (M10) battery terminal stud
• #8-32 screw terminals with captive star lock washers for branch-circuit connections
• Insulating cover meets ABYC and USCG insulation requirements
• Ignition protected to ISO 8846 and SAE J1171 for use in gasoline engine compartments
• Includes a 4-circuit negative busbar, write-on labels, and eight nylon insulated ring terminals

Installation and fit

The battery-terminal layout keeps circuit protection close to the power source, which is useful on smaller boats and refits where there is not much room for a separate fuse panel. Before installation, check that the battery terminal has enough clearance for the fuse block, cover, and wire bends, and confirm that the stud size matches the 3/8 in. (M10) mounting hole.

Each branch circuit lands on a screw terminal, so this setup works well when you want a straightforward service point for added electronics, lighting, pumps, or charging outlets. Because it uses standard ATO and ATC blade fuses, each circuit can be protected to match the wire size and the connected load.

Use on board

This kit fits boats that need a compact distribution point near the battery rather than a larger panel-mounted fuse block farther away. It is a practical match for tenders, center consoles, small sailboats, and other installations where four protected circuits are enough and clean battery-area wiring matters.

What's included

• ST-Blade Battery Terminal Mount Fuse Block
• 4-circuit negative busbar
• Insulating cover
• Write-on circuit labels
• Four 16-14 AWG nylon insulated ring terminals
• Four 12-10 AWG nylon insulated ring terminals

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

Learn more.

Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

Learn more.

Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

Learn more.