Industrial CMF300 Fuse

CMF300 is a 300-amp, 660-volt high-rupturing-capacity fuse from the ALSTHOM CMF family, designed for industrial power distribution and switchgear. Manufactured under the GEC Alsthom/ALSTHOM brand lineage, the CMF300 supports 660V operation and is built to interrupt excessive currents promptly in medium- to high-current circuits. As a 300A HRC fuse, it withstands short overloads while providing reliable short-circuit protection to protect feeders, busbars, and adjacent equipment in demanding industrial installations. The CMF300 fuse is associated with CSA-listed 660V, 300A industrial protection devices, making it suitable for CSA-compliant panels and switchgear where robust performance at 660V is required. In practice, engineers specify CMF300 when integrating legacy ALSTHOM/GEC Alsthom protection into modern assemblies that require a proven 300A, 660V solution. These devices belong to an older CMF series, which use robust fusible links designed to interrupt currents quickly while tolerating brief overloads without nuisance trips. Typical installations include power distribution panels in manufacturing, process control centers, and utility switchgear where 660V systems demand reliable overcurrent protection. Availability from distributors often includes stock numbers and cross references to CMF300 against similar modern equivalents, helping engineers replace aged fuses without altering the overall protection scheme.