Blue Sea Systems MEGA/AMG Fuse, For AMG Fuse Blocks, 70V DC, Ignition Protected, 2500A Interrupt Capacity

Overview

The Blue Sea Systems MEGA / AMG Fuse is a bolt-down DC fuse for Blue Sea Systems AMG fuse blocks, covering high-current circuit protection from 100A to 300A. It is rated for a maximum voltage of 70V DC and has an interrupt capacity of 2500A at 70V DC, which makes it suitable for many marine DC distribution jobs where large battery cables, charging circuits, inverters, windlasses, thrusters, or other high-load equipment need proper overcurrent protection.

This fuse family is ignition protected and works with Blue Sea Systems AMG fuse blocks, including the AMG Safety Fuse Block 7721. The compact bolt-down format helps keep high-current connections secure in areas that see vibration, such as battery compartments, machinery spaces, and protected electrical panels.

Key features

• Available amperage ratings from 100A to 300A for matching the fuse to the protected cable and load.
• 70V DC maximum voltage rating for use in common low-voltage marine DC systems.
• 2500A interrupt capacity at 70V DC for fault protection in high-current DC circuits.
• Ignition protected construction for use in marine electrical installations where ignition protection is required.
• Works with Blue Sea Systems AMG fuse blocks, including the 7721 AMG Safety Fuse Block.
• Bolt-down fuse format helps maintain a firm connection in boats that see vibration and repeated movement.
• Supplied one fuse per retail package.

Variants

This fuse range varies by amperage rating. The available configurations are 100A, 125A, 150A, 175A, 200A, 250A, and 300A, giving the installer options for different high-current circuits on board.

The shared specifications across the range include the 70V DC maximum voltage rating, 2500A interrupt capacity at 70V DC, ignition protected rating, and compatibility with Blue Sea Systems AMG fuse blocks. Fuse selection should be based on the cable size, circuit load, and the protection requirements of the equipment being connected.

Installation and setup

Install this fuse in a compatible AMG fuse block with clean contact surfaces and properly sized conductors. In a marine DC system, the fuse should be placed close to the source of power when it is protecting a battery-fed circuit, while still allowing safe access for inspection and replacement.

High-current DC connections need careful preparation. Use correctly crimped lugs, protect the circuit from moisture where practical, and torque the hardware according to the fuse block requirements. Undersized cable, loose terminals, or poor crimps can create heat under load, even when the fuse rating itself is correct.

Use cases on board

This fuse family is a good match for boat owners and installers building or servicing high-amperage DC circuits where reset capability is not required and a bolt-down fuse is preferred. Typical applications include battery distribution, charge paths, inverter feeds, windlass wiring, bow thruster circuits, and other DC loads that fall within the proper amperage range for the selected variant.

Because the amperage changes by variant, it is important to match the fuse to the conductor and the equipment rather than choosing by load alone. A correctly selected fuse helps protect the wiring first, then the connected equipment, which is the right priority in a safe marine electrical system.

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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