Mersen Ferraz Shawmut 603001J Fuse Block – 30A, 600V, 1-Pole, Class J, DIN-Rail/Screw Mount

The 603001J is a single-pole holder designed specifically for Class J fuses. Unlike standard open blocks, this model often features a more compact footprint and is part of a modular system where "Adder" poles can be snapped together to create multi-pole configurations. It uses high-conductivity tin-plated copper clips and a glass-filled polycarbonate base for superior heat resistance.