Mersen A130UD73TTI350 / A301047 Protistor Fuse, 350A 1250VAC, High-Speed Square Body Size 73

The Mersen A130UD73TTI350 (A301047) is a high-performance ultra-fast acting fuse from the Protistor® Size 73 series. Engineered for the specialized protection of power semiconductors, this square body fuse is optimized for diodes, thyristors, and IGBT devices. Designed with advanced arcing control and extremely low I²t levels, it provides ultimate protection for modern power conversion equipment, including industrial drives, UPS systems, and traction inverters.

Key Features

• Precision Semiconductor Protection: Utilization category "aR" ensures an ultra-fast response to short-circuit faults, minimizing let-through energy to protect sensitive electronic components.
• High Interrupting Rating: Features a robust breaking capacity of 126kA, certified for high-voltage environments up to 1300VAC (UL).
• Advanced Indicator System: Equipped with an integrated mechanical striker that provides reliable visual trip indication and is ready for microswitch mounting for remote fault signaling.
• Premium Construction: Assembled with high-grade ceramic and silver-plated brass terminals (flush ends with UNC threads) to ensure high conductivity and low power dissipation.
• Optimized Performance: Uses die-cut elements embedded in solidified sand, resulting in consistent arcing characteristics and high thermal stability.

Technical Specifications

• Manufacturer: Mersen
• Catalogue Number: A130UD73TTI350
• Item Number: A301047
• Current Rating: 350A
• Voltage Rating: 1250VAC (IEC) / 1300VAC (UL)
• Breaking Capacity: 126kA at Rated Voltage
• Utilization Category: aR (High-Speed Semiconductor Protection)
• Fuse Size: 73
• Connection Type: Flush Ends (UNC Threaded)
• Melting I²t: 17 kA²s
• Clearing I²t: 140 kA²s (At Rated Voltage)
• Power Dissipation: 86W at Rated Current
• Body Material: Ceramic
• Terminal Material: Silver-Plated Brass