Mersen A060UD32TTI1250 Protistor Fuse, 1250A 600V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® A060UD32TTI1250 (Item Number W300445) is a high-performance, ultra-fast acting square body fuse-link designed for the protection of power semiconductor devices. This Size 32 aR category fuse is engineered for extreme industrial applications involving high-current power conversion, such as large motor drives, heavy-duty rectifiers, and high-capacity traction substations. It is specifically designed to provide superior protection by limiting I²t let-through energy to extremely low levels, preventing thermal damage to power semiconductors like diodes, thyristors, and GTOs.

Built with a high-grade ceramic body for maximum thermal resistance and silver-plated copper mounting terminals for enhanced conductivity, this fuse ensures long-term operational reliability. The internal pure silver elements combined with high-purity sand facilitate efficient arc quenching and a high breaking capacity of 200kA. This model features an integrated Type I mechanical striker, allowing for local visual confirmation of a fuse trip and enabling remote monitoring via an optional auxiliary microswitch. The TTI flush-end M10 metric threaded interface provides a secure, low-loss bolted connection to industrial busbar systems.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A060UD32TTI1250
• Item Number: W300445
• Amperage Rating: 1250A
• Voltage Rating: 600V AC (IEC / UL)
• Interrupting Rating (Breaking Capacity): 200kA at 600V 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: 580 kA²s
• Total Clearing I²t at Rated Voltage: 3700 kA²s
• Power Dissipation at Rated Current: 195W
• Standards Compliance: IEC 60269-4, UL Recognized, RoHS Compliant
• Quantity: Pack of 3