Blue Sea Systems ST Glass 6 Circuit Fuse Block, 32V DC, 100A, AGC/MDL Fuses

Overview

The Blue Sea Systems ST Glass 6 Circuit Fuse Block is a compact DC fuse block for organizing up to six protected branch circuits on a boat. It is rated for 32V DC systems, with a maximum of 100A per block and 30A per circuit, making it a practical fit for many low-voltage marine loads such as electronics, cabin accessories, pumps, lighting circuits, and other fused DC equipment.

This ST Glass fuse block accepts AGC fast-acting, MDL time-delay, and other 3AG glass fuses. The clear polycarbonate cover protects the conductive parts, helps meet ABYC and USCG insulation requirements, and includes space for circuit labeling and spare fuse storage, which makes inspection and service easier in a helm, console, cabin locker, or other protected electrical area.

Key features

• Six fused circuits for consolidating DC branch protection in one organized location.
• Rated for 32V DC, with 100A maximum per block and 30A maximum per circuit.
• Accepts AGC, MDL, and other 3AG glass fuses for common marine DC circuit protection.
• Tin-plated copper buses and phosphor bronze fuse clips support the full 30A circuit rating.
• Clear polycarbonate cover insulates conductive parts and stores spare fuses inside the block area.
• Label recesses on the cover help keep circuits identified for troubleshooting and future service.
• Reinforced polycarbonate base and #8-32 screw terminals with captive star lockwashers support secure wiring connections.
• Mounts with #10 screws for installation on a flat electrical panel, bulkhead, or equipment board.

Variants

This product is offered in two configurations, both based on the same ST Glass 6 circuit format with a protective cover.

The main difference is the negative bus. Both versions support the same 32V DC system rating, 100A block rating, 30A per circuit rating, AGC and MDL fuse compatibility, and #8-32 screw terminal style.

• 5015: Bus Type Negative Bus and Cover. This version combines the six fused positive circuits with an integrated negative bus, giving accessory negative returns a common landing point near the fuse block.
• 5018: Bus Type Cover. This version provides the six fused circuits with the protective cover, without an integrated negative bus, for installations where negative returns are handled on a separate bus bar.

Installation and setup

Install the block in a dry, accessible location where the cover can be removed and each fuse can be inspected without disturbing nearby wiring. Common locations include a helm electrical panel, electronics locker, cabin distribution area, or a protected equipment board near the loads being served.

Use wire size and fuse values that match the connected equipment and the circuit length. The fuse protects the wire, so each circuit should be sized for the load, conductor gauge, and installation conditions. The #8-32 screw terminals with captive star lockwashers help maintain firm connections in a marine environment where vibration is a normal part of service.

Compatibility and fit

This fuse block is for DC circuits up to 32V and is compatible with AGC, MDL, and other 3AG glass fuses. It works well where a boat already uses glass fuses or where the installer wants an organized block with labeling and spare fuse storage under the cover.

The version with a negative bus is better suited to compact wiring layouts where accessory negative wires need to return close to the protected circuits. The version without a negative bus fits systems that already use a separate negative bus bar or a larger DC distribution layout.

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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