Westinghouse Electric 504C920H03 Current Limiter Fuse

The Westinghouse Electric 800LAP12 current limiter fuse provides reliable fault-current interruption and circuit protection for industrial power distribution systems. It carries Manufacturer Part Number 800LAP12 with Additional Part Number 504C920H03 and belongs to the Type K KL LA TRI-PAC family, designed for fuse-assembly mounted protection in switchgear, motor control centers, and distribution panels. Its primary function is fault current limitation and overcurrent protection, making it a common choice for manufacturing facilities, substations, MCC systems, process equipment, and other heavy industrial electrical equipment. This device is typically installed in switchgear and MCC panels as part of industrial power distribution protection assemblies. Common replacements listed include Ferraz Shawmut A4BQ current-limiting fuse.