Mersen A070UD32KI800 Protistor Fuse, 800A 700V AC, Size 32 aR, High-Speed Square Body with KI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32KI800 (Item Number N300197) is an industry-standard, ultra-fast acting square body fuse-link designed for the protection of power semiconductor devices. With a high rated current of 800A and a voltage rating of 700V AC, this Size 32 aR class fuse is ideal for demanding industrial applications such as high-power rectifiers, traction inverters, and large motor drives. It is engineered to provide superior peak current limitation and extremely low I²t (clearance energy), ensuring rapid circuit interruption to protect sensitive components like thyristors, GTOs, and IGBTs.

The fuse is constructed with a high-strength ceramic body and silver-plated copper KI-style bolted contacts (Metric Bolted Studs), offering low power loss and high resistance to mechanical vibration and thermal cycling. The internal silver elements and high-grade silica sand filling guarantee efficient arc quenching and a robust breaking capacity of 200kA. This model features an integrated Type K mechanical striker, providing a reliable physical trip indication that can also be used to actuate an external microswitch for remote fault detection.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32KI800
• Item Number: N300197
• 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: KI (Metric Bolted Studs)
• Indication System: Integrated Mechanical Striker (K-Type)
• Pre-arcing I²t: 165 kA²s
• Total Clearing I²t at Rated Voltage: 1100 kA²s
• Power Dissipation at Rated Current: 120W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3