FERRAZ SHAWMUT 4AJ125 Class J Fuse 125 Amps 600 Volts

The Ferraz Shawmut 4AJ125 Class J fuse is a current-protection device rated for 125 Amps and up to 600 Volts, manufactured by Ferraz Shawmut. Identified by the 4AJ125 model designation, it belongs to Ferraz Shawmut’s Class J family, which covers a range of fuses designed to protect electrical circuits and equipment from overcurrent by interrupting fault currents. This fuse provides a defined current rating and voltage limit that installers specify to safeguard power distribution components, motors, controls, and other devices in systems that require a Class J fuse. The 125 A rating and 600 V maximum voltage set clear boundaries for selecting it in compatible panels, junctions, or switchgear that use standard Class J fuse holders. When integrating this part, confirm that the system voltage and fault-current requirements align with the 4AJ125’s specifications to ensure proper protection and reliable operation. The Ferraz Shawmut brand is known for industrial fuses and electrical protection devices, and the 4AJ125 designation identifies this particular product within the Class J lineup. Use this part wherever a 125 A, 600 V Class J fuse is specified on the electrical design or protective relay documentation for safe, compliant operation.