Johnson Controls P74EA-3 SPDT Differential Pressure Switch

The Johnson Controls P74EA-3 SPDT Differential Pressure Switch is a safe device used in the HVAC system. It determines the difference of pressure at two points in a system. When the pressure difference is more than a limit set at 3.5 PSI the switch provides an on-off signal indication. This signal can turn off equipment, sound bells or bring about other corrective measures. It operates in the temperature range of -30°F to 130°F and is compatible with various liquids and gases. A wide voltage range of 24 to 600 VAC is also suitable for interfacing with most HVAC control systems. The switch may help avoid pressure change damages to filters, coils and other components in the system.