Mersen A070UD32LI700 Protistor Fuse, 700A 700V AC, Size 32 aR, High-Speed Square Body with LI Bolted Contacts - Pack of 3

The Mersen Protistor® A070UD32LI700 (Item Number D219781) is a high-capacity, ultra-fast acting square body fuse-link engineered for the high-performance protection of power semiconductor devices. With a robust rated current of 700A and a voltage rating of 700V AC, this Size 32 aR class fuse is specifically designed for heavy-duty industrial power conversion systems, including large-scale rectifiers, high-power DC drives, and traction power supplies. It provides exceptional current limitation and low let-through energy (I²t), ensuring critical protection for sensitive electronic components such as thyristors and IGBTs.

The A070UD32LI700 is constructed with a high-grade ceramic body and silver-plated copper LI-style (Bolted Blade) contacts to ensure low contact resistance and maximum thermal efficiency. Its internal architecture features pure silver elements and high-purity silica sand for superior arc quenching, supporting a high breaking capacity of 200kA. This fuse-link is equipped with an integrated Type K mechanical striker, providing a reliable local visual indication of operation and the capability to trigger an external microswitch for remote monitoring.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32LI700
• Item Number: D219781
• Amperage Rating: 700A
• 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: 130 kA²s
• Total Clearing I²t at Rated Voltage: 880 kA²s
• Power Dissipation at Rated Current: 110W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3