Mersen Protistor B300519 PC71UD13C315TF High-Speed Fuse, 315A 1250VAC, Size 71 aR, Flush End

The Mersen Protistor® B300519 (PC71UD13C315TF) is a premium square body high-speed fuse designed for the ultimate protection of power semiconductor devices. Engineered for size 71, this aR ultra-fast acting fuse-link is specifically optimized for diodes, thyristors, and IGBT devices in high-power conversion equipment. Utilizing die-cut elements embedded in solidified sand, it ensures precise arcing control, low I²t (clearing integral), and superior breaking capacity. All contact surfaces are silver-plated to maintain high conductivity and prevent oxidation over long-term service.

Key Features

• Ultra-Fast Semiconductor Protection: The aR characteristic provides high-speed clearing to safeguard sensitive components from overcurrent damage.
• High Interrupting Rating: Features a breaking capacity of 126 kA at rated voltage, ensuring safety in demanding industrial power environments.
• Integrated Striker Indicator: Equipped with a mechanical striker for visual indication and the ability to trigger a field-mountable microswitch for remote monitoring.
• Robust Flush End Mounting: Designed with metric-threaded flush end contacts for secure, low-resistance bolted installation.
• Premium Material Construction: Built with a high-grade ceramic body and non-magnetic silver-plated brass hardware for reliable performance under thermal stress.

Technical Specifications

• Manufacturer: Mersen
• Series: Protistor® Size 71
• Item Number: B300519 (PC71UD13C315TF)
• Current Rating: 315 A
• Voltage Rating (IEC): 1250 V AC
• Voltage Rating (UL): 1300 V AC
• Utilization Category: aR (Ultra-fast acting)
• Breaking Capacity: 126 kA AC
• Mounting Style: Flush ends / Bolted
• Clearing I²t (at Rated Voltage): 129 kA²s
• Power Dissipation: 73 W at rated current
• Indication: Striker System
• Dimensions: 51 mm (W) x 74 mm (L) x 56.5 mm (H)