Mersen A070UD32KI315 Protistor Fuse, 315A 700V AC, Size 32 aR, High-Speed Square Body with KI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32KI315 (Item Number E300189) is a high-performance ultra-fast acting square body fuse-link, engineered for the protection of power semiconductor devices. With a rated current of 315A and a voltage rating of 700V AC, this Size 32 aR category fuse is tailored for medium-voltage industrial power systems, including power converters, UPS systems, and variable speed drives. It is designed to minimize let-through energy (I²t) and provide superior current limitation, effectively protecting sensitive components such as thyristors, GTOs, and IGBTs from overcurrent and short-circuit faults.

Constructed with a premium ceramic body and silver-plated copper KI-style bolted terminals, this fuse ensures high electrical conductivity and robust mechanical mounting. The internal architecture utilizes pure silver melting elements and high-purity silica sand for rapid arc quenching, enabling a verified breaking capacity of 200kA. This model is equipped with an integrated mechanical striker (Type K) for visual trip indication and allows for the mounting of a microswitch for remote fault monitoring within integrated safety circuits.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32KI315
• Item Number: E300189
• Amperage Rating: 315A
• Voltage Rating: 700V AC (UL/IEC)
• Interrupting Rating (Breaking Capacity): 200kA at 700V AC
• Operating Class: aR (Ultra-Fast Acting)
• Product Size: 32
• Mounting Configuration: KI (Metric Bolted Studs)
• Indication System: Integrated Mechanical Striker (K-Type)
• Pre-arcing I²t: 8.5 kA²s
• Total Clearing I²t at Rated Voltage: 57 kA²s
• Power Dissipation at Rated Current: 62W
• Standards Compliance: UL Recognized, IEC 60269-4, RoHS Compliant
• Quantity: Pack of 3