Blue Sea Systems 5503 ANL Fuse Block, 750 Amp Max, 5/16 Inch (M8) Studs

The Blue Sea Systems 5503 is an ANL fuse block built for high-current marine DC circuits, rated to a maximum operating current of 750 amps. It uses 5/16"-18 (M8) terminal studs to accept ring terminals up to 4/0 AWG cable, and the block itself mounts with 1/4" (M6) screws for a secure, vibration-resistant installation. Stainless steel studs resist corrosion in the marine environment while providing the torque strength needed for a solid, low-resistance electrical connection under heavy load.

The block body is molded from reinforced polycarbonate for durability and electrical insulation, and it is finished in black. An insulating cover is included, shielding the live ANL fuse and terminals from accidental contact and reducing the risk of a dropped-tool short circuit. The block measures 7 inches by 2 inches and is designed for use on DC systems up to 32 volts, making it suitable as the primary overcurrent protection point for battery banks, inverters, windlasses, and other high-draw 12V/24V marine circuits.

This is a single-position ANL fuse block; it does not include the ANL fuse itself, which is sold separately and sized to the circuit being protected, up to the block's 750 amp maximum rating.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 5503
• Product Category: Marine Fuse Block (ANL)
• Terminal Stud Size: 5/16"-18 (M8)
• Maximum Operating Current: 750 Amps
• Mounting Hardware: 1/4" (M6) Screws
• Voltage Rating: Up to 32 Volts DC
• Base Material: Reinforced Polycarbonate
• Color: Black
• Maximum Cable Size: 4/0 AWG
• Dimensions: 7 inches x 2 inches (W x H)
• Cover: Insulating cover included
• Weight: 1.06 pounds
• UPC: 632085055035

Frequently Asked Questions

What is the maximum amperage the Blue Sea Systems 5503 fuse block can handle? 750 amps is the maximum operating current for the Blue Sea Systems 5503 ANL fuse block, making it suitable for high-draw circuits like battery banks and inverters.

What size terminals does the 5503 fuse block accept? It accepts ring terminals sized for 5/16"-18 (M8) studs, with a maximum cable size of 4/0 AWG on the Blue Sea Systems 5503.

Does the 5503 fuse block come with a cover? Yes, the Blue Sea Systems 5503 includes an insulating cover that shields the live fuse and terminal connections from accidental contact.

What are the dimensions of this fuse block? The Blue Sea Systems 5503 measures 7 inches by 2 inches and weighs 1.06 pounds.

Is the ANL fuse included with the 5503 fuse block? No, the 5503 is the fuse block only; the ANL fuse itself is sold separately and should be sized to the circuit's amperage needs, up to the block's 750 amp maximum.

What is the 5503 fuse block made of? Reinforced polycarbonate forms the body of the Blue Sea Systems 5503, providing durability and electrical insulation in a marine environment.

What size screws are used to mount the 5503 fuse block? 1/4" (M6) screws are used to mount the Blue Sea Systems 5503 to a panel or bulkhead.

What voltage systems is the 5503 fuse block rated for? The Blue Sea Systems 5503 is rated for use on DC systems up to 32 volts, covering both standard 12V and 24V marine electrical systems.

Why are the terminal studs stainless steel on this fuse block? Stainless steel studs on the Blue Sea Systems 5503 resist corrosion in the marine environment while withstanding the high torque needed for a solid, low-resistance connection.

How does the 5503 differ from Blue Sea's 5005 fuse block? The 5503 is rated to a 750 amp maximum with 1/4" (M6) mounting screws, while the Blue Sea Systems 5005 is rated to 300 amps and mounts with smaller #10 (M5) screws, making the 5503 the choice for higher-current circuits.

What is the color and finish of the 5503 fuse block? The Blue Sea Systems 5503 fuse block body is black.