Mersen A070UD32KI500 Protistor Fuse, 500A 700V AC, Size 32 aR, High-Speed Square Body with KI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32KI500 (Item Number J300193) is a high-performance, ultra-fast acting square body fuse-link engineered for the protection of power semiconductor devices. With a 500A current rating and 700V AC capacity, this Size 32 aR class fuse is a critical safety component for high-demand industrial power systems, including rectifiers, high-power converters, and motor drives. It is designed to provide exceptionally low let-through energy (I²t) and excellent peak current limitation, shielding sensitive semiconductors like thyristors and diodes from high-energy short-circuit faults.

Constructed with a high-strength ceramic housing and silver-plated copper KI-style bolted contacts (Metric Bolted Studs), the fuse ensures superior thermal management and mechanical stability. Its internal engineering utilizes pure silver elements and high-purity silica sand for rapid arc extinguishing, achieving a high breaking capacity of 200kA. This model features an integrated mechanical K-type striker for local visual indication of fuse operation and is compatible with microswitches for remote system diagnostics.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32KI500
• Item Number: J300193
• 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: KI (Metric Bolted Studs)
• Indication System: Integrated Mechanical Striker (K-Type)
• Pre-arcing I²t: 38 kA²s
• Total Clearing I²t at Rated Voltage: 250 kA²s
• Power Dissipation at Rated Current: 85W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3