Mersen A070UD32TTI450 Protistor Fuse, 450A 700V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® A070UD32TTI450 (Item Number L300436) is a high-performance ultra-fast acting square body fuse-link tailored for the rigid protection requirements of power semiconductor devices. Belonging to the Size 32 aR class, this fuse is optimized for high-voltage power conversion applications including industrial motor drives, UPS systems, and power rectifiers. It is meticulously engineered to provide low I²t let-through energy, shielding critical components such as IGPTs, diodes, and thyristors from catastrophic overcurrent events.

The unit features a high-strength ceramic housing and silver-plated copper terminals to ensure high conductivity and durability under thermal stress. The internal architecture consists of pure silver elements and high-grade quartz sand for enhanced arc quenching and a high breaking capacity of 200kA. This model includes an integrated Type I mechanical striker for physical trip indication and monitoring. Its TTI flush-end M10 metric threaded design facilitates a direct, secure, and low-resistance connection to electrical busbar systems.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32TTI450
• Item Number: L300436
• Amperage Rating: 450A
• Voltage Rating: 700V AC (IEC / UL)
• Interrupting Rating (Breaking Capacity): 200kA at 700V AC
• Operating Class: aR (Ultra-Fast Acting)
• Product Size: 32
• Mounting Configuration: Flush-End M10 Metric Threads (TTI)
• Indication System: Integrated Mechanical Striker (Type I)
• Pre-arcing I²t: 23.5 kA²s
• Total Clearing I²t at Rated Voltage: 165 kA²s
• Power Dissipation at Rated Current: 85W
• Standards Compliance: IEC 60269-4, UL Recognized, RoHS Compliant
• Quantity: Pack of 3