Mersen A070UD32TTI1000 Protistor Fuse, 1000A 700V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® A070UD32TTI1000 (Item Number T300443) is an ultra-fast acting square body fuse-link designed for the high-demand protection of power semiconductor devices. This Size 32 aR class fuse is optimized for high-power industrial applications, including large power converters, industrial rectifiers, and heavy-duty motor drives. It provides superior short-circuit protection by significantly limiting the I²t let-through energy, ensuring the safety of sensitive components such as thyristors and SCRs.

Engineered with a high-grade ceramic body for maximum thermal endurance and silver-plated contact surfaces for optimal conductivity, this fuse is built for reliability in professional electrical systems. The internal pure silver elements combined with high-purity sand filler facilitate extremely fast arc quenching and a high breaking capacity of 200kA. This model includes an integrated Type I mechanical striker, serving as a visual trip indicator and enabling the use of an optional microswitch for remote fault signaling. The TTI flush-end M10 metric threaded terminals ensure a low-inductance, high-integrity bolted connection for industrial busbars.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32TTI1000
• Item Number: T300443
• Amperage Rating: 1000A
• 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: 300 kA²s
• Total Clearing I²t at Rated Voltage: 2100 kA²s
• Power Dissipation at Rated Current: 165W
• Standards Compliance: IEC 60269-4, UL Recognized, RoHS Compliant
• Quantity: Pack of 3