Schneider Electric Telemecanique XB3D1939 Rotary Cam Switch

The Telemecanique XB3D1939 Rotary Cam Switch from Telemecanique (Schneider Electric) is a panel‑mount, manual rotary switch designed for circuit selection and machine control in industrial automation. It enables manual rotary switching for machine mode selection, motor control, circuit changeover, and process control, and is commonly installed in operator control panels, machine tools, process equipment, conveyors, and OEM machinery that require multiple switching positions. The XB3D1939 is part of the XB3D family (obsolete) and has been superseded by the Schneider Electric 9003K2 cam switch series; common replacements include the 9003K2 Rotary Cam Switch and 9003K2 custom‑configured cam switches, with Harmony K Series as an equivalent. Because it is discontinued, this part is typically used for retrofit or replacement in legacy control panels and machinery that relied on multi‑position rotary switching.