Mersen A055UD32LI1400 Protistor Fuse, 1400A 550V AC, Size 32 aR, High-Speed Square Body with LI Bolted Contacts - Pack of 3

The Mersen Protistor® A055UD32LI1400 (Item Number M219789) is a robust, ultra-fast acting square body fuse-link designed for the protection of high-power semiconductor devices. With a high rated current of 1400A and a voltage rating of 550V AC, this Size 32 aR class fuse is specifically optimized for industrial-scale power conversion systems. It is ideally suited for protecting large rectifiers, DC drives, and high-capacity static transfer switches where ultra-low let-through energy (I²t) and superior current limitation are required to safeguard sensitive components like thyristors and power modules.

Engineered for extreme reliability, the A055UD32LI1400 features a premium ceramic body and silver-plated copper LI-style (Bolted Blade) terminal contacts for maximum electrical conductivity and efficient thermal management. The fuse internal design utilizes pure silver elements and high-purity silica sand for rapid arc quenching, enabling a high breaking capacity of 200kA. This model is equipped with an integrated Type K mechanical striker, providing visual indication of operation and allowing for the mounting of auxiliary microswitches for remote system signaling.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A055UD32LI1400
• Item Number: M219789
• Amperage Rating: 1400A
• Voltage Rating: 550V AC (IEC) / 600V AC (UL)
• Interrupting Rating (Breaking Capacity): 200kA at 550V 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: 1,150 kA²s
• Total Clearing I²t at Rated Voltage: 7,000 kA²s
• Power Dissipation at Rated Current: 190W
• Standards Compliance: IEC 60269-4, UL 248-13 Recognized, RoHS Compliant
• Quantity: Pack of 3