Mersen PC73UD13C550TF / P300508 Protistor Size 73 aR High-Speed Fuse, 550A, 1250VAC

The Mersen PC73UD13C550TF (Reference: P300508) is a premium Protistor® square body fuse-link, designed for the ultra-fast-acting protection of semiconductor devices. This Size 73 aR class fuse is engineered to protect diodes, thyristors, and IGBT modules in high-power applications such as AC/DC drives and large rectifiers. With a 1250VAC rating and exceptional breaking capacity, it ensures rapid circuit interruption with low I²t let-through values to prevent damage to sensitive electronics. The TTF (Tapped Terminal Face) mounting style with M12 threading ensures a reliable, low-resistance connection in high-density power systems.