Industrial TDW-1C M-4187-A Printed Circuit Board

AEC International TDW-1C control board, model M-4187-A, is a rugged printed circuit board designed as the primary controller in industrial temperature-control panels. In catalog listings the TDW-1C board is identified by multiple identifiers—503390 and K-4207-C—confirming its role as the TDW-1C circuit board used in legacy systems. Refurbishment and resale listings describe the 503390 TDW-1C board as a discontinued AEC International component intended for solid-state control in temperature-control panels and related automation equipment, with supplier notes citing operation in environments up to 250°F. This module is suitable for legacy industrial process equipment and automation panels where a like-for-like TDW-1C replacement is needed to maintain ongoing control functionality.