Mersen A055UD32TTI1400 Protistor Fuse, 1400A 550V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® A055UD32TTI1400 (Item Number X300446) is a high-capacity, ultra-fast acting square body fuse-link engineered for the comprehensive protection of power semiconductor devices. This Size 32 aR class fuse is specifically designed for high-power electronics applications, including massive industrial rectifiers, large-scale UPS systems, and advanced power converters. It excels in minimizing I²t let-through energy to provide superior short-circuit protection for sensitive components such as thyristors, SCRs, and diodes.

Constructed with a premium ceramic body for exceptional thermal and mechanical durability, the fuse features silver-plated copper contact surfaces to ensure low resistance and high conductivity. The internal structure utilizes pure silver elements and high-purity silica sand to provide rapid arc quenching and a high breaking capacity of 200kA. The "TTI" configuration features flush-end M10 metric threaded terminals, allowing for a compact and robust bolted connection to busbars. This unit includes a Type I mechanical striker, providing a reliable visual indication of fuse operation and the ability to interface with a microswitch for remote fault detection.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A055UD32TTI1400
• Item Number: X300446
• 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: Flush-End M10 Metric Threads (TTI)
• Indication System: Integrated Mechanical Striker (Type I)
• Pre-arcing I²t: 850 kA²s
• Total Clearing I²t at Rated Voltage: 5100 kA²s
• Power Dissipation at Rated Current: 210W
• Standards Compliance: IEC 60269-4, UL Recognized, RoHS Compliant
• Quantity: Pack of 3