Mersen A070UD32KI450 Protistor Fuse, 450A 700V AC, Size 32 aR, High-Speed Square Body with KI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32KI450 (Item Number H300192) is an ultra-fast acting square body fuse-link designed for the protection of power semiconductor devices. With a rated current of 450A and a voltage capacity of 700V AC, this Size 32 aR category fuse is specialized for high-power industrial equipment, including heavy-duty rectifiers, AC/DC drives, and static transfer switches. It is engineered to provide an extremely low let-through energy (I²t) and superior peak current limitation, effectively isolating sensitive components such as thyristors and IGBTs from overcurrent transients.

This fuse features a high-grade ceramic body and silver-plated copper KI-style bolted terminal blades (Metric Bolted Studs), guaranteeing minimal contact resistance and high mechanical integrity. The internal technical design includes pure silver fuse elements and high-purity silica sand for accelerated arc quenching, supporting a high breaking capacity of 200kA. The A070UD32KI450 comes equipped with a Type K mechanical striker for visual status indication and facilitates the integration of a microswitch for remote fault monitoring.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32KI450
• Item Number: H300192
• Amperage Rating: 450A
• 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: KI (Metric Bolted Studs)
• Indication System: Integrated Mechanical Striker (K-Type)
• Pre-arcing I²t: 27 kA²s
• Total Clearing I²t at Rated Voltage: 180 kA²s
• Power Dissipation at Rated Current: 78W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3