Schneider Electric (Barber Colman) 21-933-1 Cover The snap-action switch provides a

The snap-action switch provides a clean break

It will mechanically reconnect the electrical circuit once the sensor detects the temperature has dropped to the 95°F closing point

By providing the mechanical resistance necessary to counteract air pressure signals

and P331-2206

or a failing blower motor rather than a defect in the switch itself

Schneider Electric (Barber Colman) 21-933-1 Cover The snap-action switch provides aFor field technicians maintaining legacy pneumatic systems, the Schneider Electric (Barber Colman) 21 933 1 Cover provides a standardized replacement solution for aging or damaged thermostat faces. This gray plastic cover is engineered as the direct successor for a wide array of vintage components, including the 21 933, 21 934, 21 939, and high frequency units like the CT 12 and CT 921. Designed for 2x2 dial type pneumatic room thermostats, it