Mersen A070UD32LI315 Protistor Fuse, 315A 700V AC, Size 32 aR, High-Speed Square Body with LI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32LI315 (Item Number W219774) is a high-performance ultra-fast acting square body fuse-link designed for the protection of power semiconductor devices. With a rated current of 315A and a voltage rating of 700V AC, this Size 32 aR class fuse is specifically engineered for critical power electronics applications, including variable speed drives, power converters, and UPS systems. It provides exceptional peak current limitation and very low I²t (clearance energy), ensuring the rapid and safe isolation of faults to protect sensitive components such as thyristors and IGBTs.

The fuse features a high-grade ceramic body and silver-plated copper LI-style (Bolted Blade) contacts, optimized for low power loss and high reliability under thermal cycling conditions. The internal construction utilizes pure silver elements and high-purity silica sand to provide efficient arc quenching and a high breaking capacity of 200kA. This model includes an integrated Type K mechanical striker, which provides a visual trip indicator and can be used to actuate an external microswitch for remote status signaling.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32LI315
• Item Number: W219774
• Amperage Rating: 315A
• 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: LI (Bolted Blades)
• Indication System: Integrated Mechanical Striker (K-Type)
• Pre-arcing I²t: 10.5 kA²s
• Total Clearing I²t at Rated Voltage: 70 kA²s
• Power Dissipation at Rated Current: 62W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3