The Ferraz Shawmut Mersen PC30UD69V315TF Fuse Link Protistor is a high-current fuse link used to interrupt fault current in electrical circuits. It is rated for 690 VAC and 315 A, providing protection for equipment and wiring in high‑voltage power systems. The PC30UD69V315TF designation identifies its specific rating and form factor within Ferraz Shawmut's Protistor fuse-link line.
