Mersen A070UD32KI630 Protistor Fuse, 630A 700V AC, Size 32 aR, High-Speed Square Body with KI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32KI630 (Item Number L300195) is a high-performance, ultra-fast acting square body fuse-link specifically designed for the protection of power semiconductor devices. With a rated current of 630A and a voltage rating of 700V AC, this Size 32 aR category fuse is optimized for high-power industrial applications, including large power converters, UPS systems, and AC/DC motor drives. It is engineered to provide an extremely low let-through energy (I²t) and superior peak current limitation, ensuring maximum protection for sensitive components such as thyristors and IGBTs.

The fuse features a high-grade ceramic body and silver-plated copper KI-style bolted terminal blades (Metric Bolted Studs), guaranteeing minimal contact resistance and exceptional mechanical integrity. The internal technical design incorporates pure silver fuse elements and high-purity silica sand for accelerated arc quenching, resulting in a high breaking capacity of 200kA. This model is equipped with a Type K mechanical striker for visual indication and supports the attachment of a microswitch for remote fault signaling.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32KI630
• Item Number: L300195
• Amperage Rating: 630A
• 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: 76 kA²s
• Total Clearing I²t at Rated Voltage: 500 kA²s
• Power Dissipation at Rated Current: 100W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3