Installing a 2-stage motor on a single-stage system will lead to harness mismatch and pressure switch failures

000-ohm nominal resistance at 77°F provides the base signal for the Selectra modulation loop

Automatic Reset: Deactivates at 170 degrees Fahrenheit and resets at 140 degrees

allowing for more accurate readings without requiring 3-wire or 4-wire compensation in many applications

Automatic Thermal Cycling: Features a 30°F differential (175°F Open / 145°F Close) for reliable automatic reset limit switch performance

Schneider Electric (Barber Colman) 2374-401 Relay Freon Installing a 2-stage motor onThe Schneider Electric 2374 401 Air Motion Relay, formerly under the Barber Colman brand, is a critical pneumatic component engineered for precise HVAC air pressure sensing and airflow monitoring. Designed to function as a differential pressure switch, this device triggers a pneumatic signal based on the presence or absence of air velocity. It operates with a minimum 0. 15" W. C. setpoint, making it sensitive enough to detect subtle changes in suction