Mersen PC73UD85V14CTF / W300517 Protistor Size 73 aR High-Speed Fuse, 1400A, 850VAC

The Mersen PC73UD85V14CTF (Reference Number: W300517) is an elite-tier Protistor® ultra-fast acting square body fuse-link, precision-engineered for the protection of high-power semiconductor devices. As part of the Size 73 series, this aR-class fuse is optimized to safeguard thyristors, diodes, and advanced power modules in demanding environments such as heavy-duty rectifiers and large-scale industrial motor drives. Rated for a nominal current of 1400A at 850VAC, it provides an exceptional balance between high current carrying capacity and extremely low I²t let-through values to prevent catastrophic failure of downstream components. The TTF (Tapped Terminal Face) design features M12 internal threads, which facilitate a secure and space-efficient direct mounting to busbars while ensuring high mechanical stability under vibration.