Blue Sea Systems ST Blade Fuse Block, 6 Independent Circuits, 32V DC, ATO/ATC

Overview

The Blue Sea Systems ST Blade Fuse Block is a 6-circuit fuse block for organizing and protecting small DC branch circuits on boats. It accepts ATO and ATC blade fuses and is rated for up to 32V DC, which makes it suitable for common 12V and 24V marine electrical systems. Each circuit is rated up to 30A, with up to 40A per jumped circuit group when the included terminal block jumpers are used.

This fuse block uses independent circuit inputs rather than a built-in negative bus, so it works well where separate feeds are needed for different loads, switched circuits, or always-on circuits. Tin-plated copper fuse clips help resist corrosion in the damp, vibration-prone spaces where boat electrical gear often lives, such as consoles, electronics lockers, helm panels, and protected utility areas.

The covered version adds a clear insulating cover with label recesses and spare fuse storage, while the uncovered version keeps the layout more open for installations inside an already protected enclosure or panel.

Key features

• 6 independent fuse circuits for organizing multiple DC loads without a common source bus built into the block.
• Accepts ATO and ATC blade fuses, giving the installer easy access to common replacement fuse types.
• Rated up to 32V DC for use in typical 12V and 24V boat electrical systems.
• 30A maximum rating per circuit, with 40A maximum per jumped circuit group.
• Tin-plated copper fuse clips help reduce corrosion concerns in protected marine electrical spaces.
• Accepts ring or snap fork terminals for secure wiring at the block.
• Mounts with #8 screws and uses #8-32 screw terminals with captive star lock washers.
• Includes two terminal block jumpers for grouping circuits under shared feeds when the installation calls for it.

Variants

This fuse block is offered in two configurations. Both are 6-circuit ST Blade fuse blocks for ATO and ATC fuses, with the main difference being whether the clear insulating cover is included.

The covered option adds protection over the fuse area and supports circuit labeling, while the uncovered option leaves the fuse block open for installations inside a separate protected panel or enclosure.

• 5035, with cover: Yes. This version includes the clear insulating cover, which helps shield the fuse area, holds spare fuses, and gives the installer a place to label circuits.
• 5037, with cover: No. This version is the open fuse block configuration, suited to protected installations where a separate cover or enclosure is already part of the layout.

Installation and setup

Use this block where several small DC loads need individual fuse protection, such as electronics, lighting, pumps, accessories, or helm equipment. Because the circuits are independently sourced, the installer can separate feeds by function, such as one group for switched loads and another for circuits that need power at all times.

Fuses are sold separately, so fuse selection should match the connected load and the wire size used in the circuit. Terminal torque is 18 in-lb, and the wiring layout should leave enough service space to inspect and replace fuses without straining the conductors.

Compatibility and fit

This is a positive-side fuse block without a negative bus, so it does not replace a return bus bar. It should be paired with a suitable negative bus or grounding arrangement elsewhere in the DC system when the installation requires one.

The block is a good match for refits and new installations where inline fuse holders have become hard to trace. Consolidating the fuses in one labeled location makes troubleshooting cleaner, especially around the helm, cabin distribution area, or electronics panel.

What’s included

• ST Blade 6-circuit fuse block
• Two terminal block jumpers

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.

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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.

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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.

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