Schneider Electric (Barber Colman) 21-933-1 Cover OEM Compatibility: Serves as the

OEM Compatibility: Serves as the official replacement for part numbers 57W7901

provided the electrical power is locked out

this unit features Silver Cadmium Oxide contacts to provide superior conductivity and resistance to welding under high-inductive loads

and P331-2206

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

Schneider Electric (Barber Colman) 21-933-1 Cover OEM Compatibility: Serves as theFor 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