Schneider Electric TC-2931 Changeover Thermostat

The Schneider Electric TC-2931 Strap-On Changeover Thermostat is a two‑position SPDT device designed for combination heating and cooling systems to sense supply‑media temperature and reverse the action of the room temperature sensor. Fixed‑setpoint versions exist for 120/240 V operation (commonly 75°F), while the TC‑2931‑205 adds an adjustable throttling range of 2–12°F (1–7°C), factory set at 2°F (1°C). Electrical and physical specs include 120/240 VAC operation, Bakelite housing for surface mounting in a vertical orientation, dimensions 3 H × 4 1/16 W × 5 D in, a 3 ft color‑coded, three‑conductor power cord, and a 3 ft sensor lead with plug‑in connections, with UL Recognition. The TC‑2931 family also includes the TC‑2931‑204 variant (10 ft, 3 m cable with plug) which Schneider notes as obsolete/NLA, while TC‑2931‑205 uses a 3 ft cable and cannot be extended.