Mersen A055UD32TTI1600 Protistor Fuse, 1600A 550V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® A055UD32TTI1600 (Item Number Y300447) is an ultra-fast acting square body fuse-link designed for the high-performance protection of power semiconductor devices. As part of the Size 32 aR class, this 1600A fuse is optimized for high-power electronics environments such as heavy-duty industrial rectifiers, high-current power converters, and large-scale wind power inverters. It provides superior protection by significantly limiting I²t let-through energy, ensuring the safety of critical components including thyristors, diodes, and IGBT modules.

The fuse is engineered with a high-durability ceramic body to withstand extreme thermal and mechanical stresses. Silver-plated copper contact surfaces are utilized to ensure high electrical conductivity and minimal power loss. The internal silver elements and high-purity silica sand filling enable rapid arc quenching and a high breaking capacity of 200kA. The "TTI" flush-end design with M10 metric threads ensures a secure, low-impedance bolted connection for industrial busbars. This unit is equipped with a Type I mechanical striker for clear visual fault indication and optional integration with a microswitch for remote status monitoring.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A055UD32TTI1600
• Item Number: Y300447
• Amperage Rating: 1600A
• 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: 1250 kA²s
• Total Clearing I²t at Rated Voltage: 7500 kA²s
• Power Dissipation at Rated Current: 230W
• Standards Compliance: IEC 60269-4, UL Recognized, RoHS Compliant
• Quantity: Pack of 3