Mersen PC32UD55V1250TF Protistor Fuse, 1250A 550V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® PC32UD55V1250TF (Item Number Z302173) is a high-performance ultra-fast acting (aR) square body fuse-link, specifically engineered for the high-current protection of power semiconductor devices. This Size 32 fuse is optimized for safeguarding diodes, thyristors, and IGBT modules within demanding power conversion systems such as industrial rectifiers, large motor drives, and massive UPS architectures where extremely low I²t let-through is critical.

Constructed with a premium ceramic body and silver-plated copper terminals, the fuse features pure silver internal elements submerged in high-grade sand for superior arcing control. With a high breaking capacity of 200kA, it ensures robust protection against high-magnitude short circuits. The design includes a Type T mechanical striker for local indication, which can be coupled with an external microswitch for remote fault monitoring. The TTF flush-end M10 metric threaded terminals provide a secure, low-impedance bolted connection for industrial busbars.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: PC32UD55V1250TF
• Item Number: Z302173
• Amperage Rating: 1250A
• Voltage Rating: 550V AC (IEC) / 600V AC (UL)
• Interrupting Rating (Breaking Capacity): 200kA at 550V AC
• Operating Class: aR (Ultra-Fast Acting)
• Product Size: 32
• Mounting Configuration: Flush-End M10 Metric Threads (TTF)
• Indication System: Integrated Mechanical Striker (Type T)
• Pre-arcing I²t: 520 kA²s
• Total Clearing I²t at Rated Voltage: 2300 kA²s
• Power Dissipation at Rated Current: 165W
• Standards Compliance: IEC 60269-4, UL/CSA Recognized E76491, RoHS Compliant
• Quantity: Pack of 3