The RM60400-3CR is a 3-pole, 600V modular knifeblade fuse block intended for Class R fuses rated from 225 to 400 amps. It features terminals that accommodate a variety of conductor sizes, including single 500 kcmil-4 AWG wires or dual 3/0-4 AWG copper and aluminum wires. As part of the Bussmann series, this block includes standard phase barriers for safety, meets UL creep and clearance requirements for industrial power circuits, and has an operating temperature range of -40°C to +120°C. Its modular design and multiple mounting holes per pole offer installation flexibility in power distribution panels and other electrical systems.