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

Overview

The Blue Sea Systems 5023 is an ST Blade battery terminal mount fuse block that adds four ATO/ATC fused circuits right at the battery. It mounts on a 3/8 in [M10] battery stud, works on DC systems up to 32V, and is rated for 100A total with up to 30A on each circuit.

This is a practical way to clean up accessory wiring near the battery and replace a cluster of separate in-line fuse holders with one protected distribution point. On board, that makes it easier to add and service a few dedicated feeds for electronics, pumps, stereo equipment, or lighting without taking up much space.

Key features

• Four independent ATO/ATC fuse positions for accessory branch circuits from one battery-side feed
• Direct battery terminal mounting with clearance for a 3/8 in [M10] stud
• 100A maximum per block and 30A maximum per circuit on systems up to 32V DC
• #8-32 screw terminals with captive star lock washers; screw terminal torque is 18 in-lb (2.03 Nm)
• Insulating cover helps reduce accidental contact and the block accepts small format circuit labels for circuit identification
• Ignition protected with the cover secured to SAE J1171 and ISO 8846

Compatibility and fit

Check the battery terminal layout before ordering. The block measures about 3.59 in long, 1.73 in wide, and 1.28 in high, so it fits best where there is enough clearance around the battery post and cable connections. It suits 12V and 24V systems and is better matched to accessory circuits than to single high-draw loads that need more than 30A on one branch.

Installation and use

Because it mounts directly at the battery, this fuse block works well when you want a short, tidy takeoff point for a few added circuits. Each outgoing circuit lands on its own screw terminal, and the label area helps later when you are tracing a chartplotter, bilge pump, stereo, or cabin light feed. It is a good match for smaller boats, refits, and auxiliary battery installations where four protected circuits are enough.

What's included

• ST Blade battery terminal mount fuse block
• Insulating cover
• One 15A ATO/ATC fuse
• Four nylon insulated ring terminals

• 1336667_qbp760285.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.