Abstract: An AC power/step-down transformer suitable for use in switchgear for controlling electrical apparatus such as an indicator lamp has low core cost and permits economical assembly, as no interleaving of laminations is required. Its magnetic circuit comprises simple rectangular coil core assemblies whose ends are either fitted into holes in upper and lower plate assemblies or abutted against them. There are two primary and two secondary coil core assemblies, spaced apart to permit pushrods to pass between them for actuation of a back-mounted switch. A primary winding is placed around both of the primary coil core assemblies, and a secondary winding is placed around both of the secondary coil core assemblies.