Schneider Electric (Barber Colman) 21-933-1 Cover High Heat Resilience: Equipped with

High Heat Resilience: Equipped with a silicone disc and stainless steel spring for consistent operation up to 250°F

Built for longevity in high-duty cycle environments

The shunt provides a continuous path on one pole which is often used for crankcase heaters or transformer power

this unit is compatible with both 2-pipe and 4-pipe systems

Double Pole Double Throw means this relay can switch two separate circuits at once

Schneider Electric (Barber Colman) 21-933-1 Cover High Heat Resilience: Equipped withFor 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