Mersen A070UD32TTI630 Protistor Fuse, 630A 700V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® A070UD32TTI630 (Item Number P300439) is a high-speed square body fuse-link engineered specifically for the ultra-fast protection of power semiconductor devices. This Size 32 aR class fuse is widely utilized in large-scale industrial electronics, including high-power rectifiers, UPS systems, and variable speed drives. Designed to provide superior short-circuit protection, it effectively limits I²t let-through energy to prevent damage to critical components such as SCRs, diodes, and thyristors.

This fuse-link is constructed using high-grade ceramic for thermal endurance and silver-plated copper contacts for optimal electrical conductivity. The internal structure utilizes pure silver elements and specialized quartz sand to facilitate rapid arc extinction and a high breaking capacity of 200kA. Equipped with a Type I mechanical striker, it supports both visual trip indication and the integration of remote signaling switches. The TTI flush-end M10 metric threaded design ensures a compact, secure, and low-resistance bolted connection to electrical busbars.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32TTI630
• Item Number: P300439
• Amperage Rating: 630A
• 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: Flush-End M10 Metric Threads (TTI)
• Indication System: Integrated Mechanical Striker (Type I)
• Pre-arcing I²t: 66 kA²s
• Total Clearing I²t at Rated Voltage: 465 kA²s
• Power Dissipation at Rated Current: 115W
• Standards Compliance: IEC 60269-4, UL Recognized, RoHS Compliant
• Quantity: Pack of 3