Protect your electrical system with the Blue Sea Systems 400A Class T Fuse (5121). Designed for heavy-duty marine, RV, and off-grid applications, this fuse provides fast-acting, reliable protection for high-amperage circuits.

With a 20,000A interrupt capacity at 125V DC, it safeguards your batteries, inverters, and large power banks against damaging short circuits and overloads. Built with Littelfuse® technology, the Class T series ensures dependable safety in compact installations where performance is critical.

✅ Key Features:

• 400A Class T Fuse – Fast-acting, high-interrupt capacity

• Protects inverters, battery banks, and high-current DC systems

• 20,000A interrupt capacity @ 125V DC

• UL listed for safety and compliance

• Compact, space-saving design for tight installations

📏 Specifications:

• Brand: Blue Sea Systems

• Model: Class T Fuse

• Part Number: 5121

• Amperage: 400A

• Voltage Rating: 125V DC Max

• Interrupt Capacity: 20,000A

• Application: Marine, RV, solar, and off-grid electrical systems

Ensure your system stays safe and reliable with the Blue Sea 400A Class T Fuse (5121)—a trusted choice for professional-grade circuit protection.