Chromalox, Pittsburgh, recently released a revised edition of its SCR Power Theory Training Manual. The free, 40-page illustrated manual on silicon controlled rectifier (SCR) power controllers has been expanded to cover ways to reduce material and labor costs when building power control panels, and it describes construction details that help reduce operational downtime.

The new edition provides discussions on SCR control theory and the application of SCR power controllers in industrial heating systems. It includes 29 schematic drawings, plus photos, tables, equations, and a glossary.

The manual may be downloaded from the company’s Web site at