Mersen A070UD32LI500 Protistor Fuse, 500A 700V AC, Size 32 aR, High-Speed Square Body with LI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32LI500 (Item Number A219778) is a high-performance ultra-fast acting square body fuse-link specifically designed for the protection of power semiconductor devices. With a high rated current of 500A and a voltage rating of 700V AC, this Size 32 aR class fuse is ideal for demanding industrial environments including power converters, heavy-duty rectifiers, and large-scale motor drives. It is engineered to provide extreme limitation of peak current and low I²t let-through values, ensuring the maximum protection for sensitive components such as diodes, thyristors, and power transistors.

Constructed with a robust ceramic body and silver-plated copper LI-style (Bolted Blade) contacts, it ensures high conductivity and excellent mechanical strength. The internal pure silver elements and high-purity silica sand filling enable efficient arc suppression and a high breaking capacity of 200kA. This fuse includes a Type K mechanical striker, providing both a visual indication of operation and the ability to trigger a remote microswitch for system-wide status monitoring.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32LI500
• Item Number: A219778
• Amperage Rating: 500A
• 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: 46 kA²s
• Total Clearing I²t at Rated Voltage: 310 kA²s
• Power Dissipation at Rated Current: 82W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3