Blue Sea Systems Fuse Holders - In Line

Blue Sea Systems Inline Fuse Holders: Precision Circuit Protection for Demanding Environments

When a single wiring run needs reliable overcurrent protection right where it matters most, an inline fuse holder is the go-to solution — and few names carry more weight in this category than Blue Sea Systems. Blue Sea Systems develops and manufactures dependable AC and DC electrical products for marine and specialized vehicle applications, and that engineering discipline comes through clearly in every inline fuse holder they produce.

A Lineup Built for Real-World Conditions

Blue Sea Systems offers a focused range of inline fuse holders covering the most common fuse formats, each engineered to handle the abuse of moisture, vibration, and heat that marine and specialty vehicle environments demand. Key product lines include:

• Waterproof In-Line ATO/ATC Fuse Holder (Model 5065): Designed for use with ATO or ATC fuses, supplied with 12 AWG pigtails, and rated for a 30A maximum fuse amperage. The waterproof construction makes it especially well-suited for exposed cockpit wiring or bilge-adjacent runs.
• In-Line ATO/ATC Fuse Holder (Model 5064): Also compatible with ATO or ATC fuses and supplied with 12 AWG pigtails, with a 30A maximum fuse amperage — a non-waterproof option for protected interior runs.
• Waterproof In-Line AGC/MDL Fuse Holder (Model 5062): Accepts 12–16 AWG wire and is rated for a 20A maximum fuse amperage, covering legacy glass-tube fuse applications in older marine and automotive systems.
• Crimpable In-Line AGC/MDL Fuse Holder (Model 5060): This crimpable design accepts 12–18 AWG wire with a 30A maximum capacity, ideal for professional installers who want a clean, solder-free termination.
• MAXI® In-Line Fuse Holder (Model 5068): Supplied with a 5-inch #6 red lead wire and two adhesive-lined sealing shrink wrap tubes, it features a firewall surface mounting hole that permits two or more holders to be mounted together, plus a protective cover with retaining strap. This is the heavy-duty option for higher-amperage feeds such as windlass or thruster circuits.

Why Blue Sea Systems Stands Apart

Founded in 1992 and headquartered in Bellingham, Washington, Blue Sea Systems designs marine-grade electrical components focused on safety and reliability. Their products meet ABYC and ISO standards for safe marine electrical systems — a level of compliance that matters when you're protecting sensitive electronics far from shore.

Blue Sea Systems' extensive selection of circuit breakers, fuses, fuse holders, and fuse blocks gives boaters a range of choices for main and branch circuit protection, and to help select the right size wire and proper fuse or circuit breaker, Blue Sea Systems offers their Circuit Wizard tool. That kind of system-level thinking — pairing products with guidance tools — reflects a brand that understands how inline fuse holders fit into a larger electrical architecture, not just as standalone parts.

Blue Sea Systems stands behind its products for as long as you own them, and will replace or issue a credit for any product found to be defective in materials or manufacture. For anyone wiring a boat, RV, or specialty vehicle, that warranty commitment is as important as the product spec itself.