S&C Electric Company 612030 SMU-20 AK Fuse Unit

612030 SMU-20 Fuse Unit from S&C Electric Company is a 14.4 kV nominal, 17.0 kV maximum fuse unit designed for use with SM-20/SML-20 indoor mountings and the SMD-20 outdoor distribution gear. It provides a 30,000 A (30K) interrupting rating, enabling rapid fault clearance on 14.4 kV feeders and helping protect downstream equipment. The unit is part of the SMU-20 family and is compatible with end fittings and silencers that adapt it to different mounting configurations; these accessories are available separately and support installation in both indoor and outdoor applications. When installed in approved SMU-20/SMD-20 configurations, the 612030 fuse unit protects feeders and transformers by interrupting fault currents in accordance with the system protection scheme, coordinating with other protective devices to limit damage and maintain service reliability. The 612030 designation identifies the 30K version within the SMU-20 lineup, a data point commonly used by utilities and specifiers when selecting protection for 14.4 kV distribution circuits.