Industrial 120SA-4 328B-1 Firing Module Resistance Board

The Weltronic 120SA-4 328B-1 Firing Module Resistance Board is an industrial electronic control board designed for SCR firing and power regulation in automation equipment. It is panel-mounted and commonly installed in motor control systems, industrial drives, heating controls, and power conversion equipment that require controlled firing circuit operation, and it is frequently used for equipment repair, retrofit projects, and restoration of industrial control systems. Key specifications include Brand Weltronic, Part Number 120SA-4, Secondary Number 328B-1, Product Type Firing Module Resistance Board, and Control Type Electronic Power Regulation Module, with compatibility for Motor Drives and Process Control Systems. Common replacements include Eurotherm SCR Control Board, Siemens Firing Control Module, and ABB Power Regulation Board.