York S1-024-35269-000 Snap Switch 0.55/1.3"-WC SPNO Close On Fall

The York S1-024-35269-000 is a snap switch that is a unique part used to monitor and control the airflow in HVAC systems especially in production lines and conveyor applications. This switch works on a simple but effective principle: it closes when exposed to a certain pressure of air normally ranging from 0.55 to 1.3" of water column. This close-on-fall feature makes it ideal for use in tracking changes in airflow, for instance, where a filter is blocked or a duct is laden. This snap switch has a sensing device that responds to pressure changes in the surrounding environment. When the pressure drops down to a certain point, the contacts of the switch make and send a signal to the control system