Dwyer Instruments DA-7031-153-1 1/8-15# Spdt Snapsw Brasstube

The Dwyer Instruments DA-7031-153-1 pressure switch is widely used in HVAC (heating, ventilation, and air conditioning) equipment. It is a brass tube body single-pole, double-throw (SPDT) switch. This indicates that it can move the lever to operate two different electrical circuits simultaneously. Because of the brass tube structure, it is corrosion-resistant and appropriate for severe settings. The switch has a bellows or pressure-sensitive diaphragm that changes size in response to applied pressure. The diaphragm or bellows activates the switch, turning on or off associated equipment like fans, pumps, or valves, when the pressure reaches a predetermined point. This makes it possible for different HVAC system operations to be automatically controlled based on variations in pressure.