Mersen PC32UD55V1250A Protistor Fuse, 1250A 550V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® PC32UD55V1250A (Item Number F130124) is a high-capacity, ultra-fast acting square body fuse-link engineered for the protection of large-scale power semiconductor devices. This Size 32 aR class fuse is rated at 1250A and 550V AC, making it an essential component for heavy-duty industrial power systems, high-current rectifiers, and high-performance DC drives. It is designed to minimize let-through energy (I²t) during fault conditions, providing superior thermal protection for sensitive semiconductors like thyristors and silicon-controlled rectifiers.

Constructed with a premium ceramic body and silver-plated copper contacts, this fuse ensures high mechanical stability and low power dissipation. The internal fuse elements are composed of pure silver, surrounded by high-purity silica sand for optimized arc quenching. With a high breaking capacity of 200kA, it ensures safe interruption of extreme overcurrents. This unit includes a mechanical striker for immediate trip indication and is compatible with microswitches for remote status monitoring.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: PC32UD55V1250A
• Item Number: F130124
• Amperage Rating: 1250A
• Voltage Rating: 550V AC (IEC / UL)
• Interrupting Rating (Breaking Capacity): 200kA at 550V AC
• Operating Class: aR (Ultra-Fast Acting)
• Product Size: 32
• Mounting Configuration: Flush-End Metric Threads (M10)
• Indication System: Integrated Mechanical Striker
• Pre-arcing I²t: 840 kA²s
• Total Clearing I²t at Rated Voltage: 4,000 kA²s
• Power Dissipation at Rated Current: 160W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, CCC, RoHS Compliant
• Quantity: Pack of 3