021-878

This high-performance Single Pole Double Throw (SPDT) Air Pressure Switch is a critical safety and operational component designed for commercial HVAC systems and industrial air handling units. Often referred to as an air proving switch, this device accurately monitors differential pressure to ensure that proper airflow is maintained before allowing the heating or cooling equipment to fire. By detecting the presence or absence of air movement, it prevents dangerous conditions such as heat exchanger overheating or improper ventilation. With a robust electrical rating of 300 VA at 120-277V, this switch is built for reliability in demanding environments. Replacing a faulty or worn pressure switch is essential for maintaining system safety, restoring furnace functionality, and ensuring optimal efficiency in large-scale climate control systems.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Commonly used in commercial rooftop units, air handlers, furnaces, and ventilation systems to monitor blower motor operation and air proving safety circuits.
Specifications: Switch Configuration: Single Pole Double Throw (SPDT); Electrical Rating: 300 VA at 120-277V AC; Function: Air Proving and Differential Pressure Monitoring.