Mersen A070UD32LI800 Protistor Fuse, 800A 700V AC, Size 32 aR, High-Speed Square Body with LI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32LI800 (Item Number F219783) is an ultra-fast acting square body fuse-link designed for the superior protection of high-power semiconductor devices. Featuring a high rated current of 800A and a 700V AC voltage rating, this Size 32 aR class fuse is highly optimized for demanding industrial sectors, including heavy-duty power rectifiers, large UPS systems, and high-performance AC/DC drives. It provides extremely high current limitation and minimized let-through energy (I²t) level to prevent damage to sensitive components like diodes, thyristors, and IGCTs during fault conditions.

The A070UD32LI800 is engineered with a high-performance ceramic body and silver-plated copper LI-style (Bolted Blade) terminal contacts for maximum electrical conductivity and durability. High-purity silica sand and pure silver elements inside the fuse ensure efficient arc quenching and a massive breaking capacity of 200kA. This unit comes equipped with a Type K integrated mechanical striker for local blown-fuse indication and compatibility with external microswitches for remote system signaling.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32LI800
• Item Number: F219783
• Amperage Rating: 800A
• 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: LI (Bolted Blades)
• Indication System: Integrated Mechanical Striker (K-Type)
• Pre-arcing I²t: 195 kA²s
• Total Clearing I²t at Rated Voltage: 1,300 kA²s
• Power Dissipation at Rated Current: 125W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3