Mersen A060UD32LI1250 Protistor Fuse, 1250A 600V AC, Size 32 aR, High-Speed Square Body with LI Bolted Contacts - Pack of 3

The Mersen Protistor® A060UD32LI1250 (Item Number L219788) is an ultra-fast acting high-power semiconductor fuse designed for maximum protection in industrial power electronics. Featuring a 1250A current rating and a 600V AC operating voltage, this Size 32 aR class fuse is engineered for heavy-duty applications such as large power rectifiers, high-capacity motor drives, and advanced traction systems. It provides exceptional current limitation and is optimized for low let-through energy (I²t) to ensure the safety of power semiconductors, including thyristors and large-scale power modules.

The A060UD32LI1250 is manufactured with a high-strength ceramic body and silver-plated copper LI-style (Bolted Blade) terminals to maximize conductivity and minimize power loss. The internal core utilizes pure silver fuse elements and high-grade silica sand for reliable arc extinguishing, supporting a robust breaking capacity of 200kA. This product features an integrated Type K mechanical striker for local fault indication and compatibility with external microswitches for remote monitoring in industrial control panels.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A060UD32LI1250
• Item Number: L219788
• Amperage Rating: 1250A
• Voltage Rating: 600V AC (IEC) / 650V AC (UL)
• Interrupting Rating (Breaking Capacity): 200kA at 600V AC
• Operating Class: aR (Ultra-Fast Acting)
• Product Size: 32
• Mounting Configuration: LI (Bolted Blades)
• Indication System: Integrated Mechanical Striker (K-Type)
• Pre-arcing I²t: 750 kA²s
• Total Clearing I²t at Rated Voltage: 4,800 kA²s
• Power Dissipation at Rated Current: 180W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3