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

• 1337076_qbp423422.pdf
• 1337077_qbp423422.pdf

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.

Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.