The Johnson Controls P10BC-7 SPDT Low Pressure Switch is a control device designed to monitor and regulate low-pressure conditions in HVAC systems. It operates by sensing pressure changes and actuating a single-pole double-throw (SPDT) switch to start or stop equipment, ensuring safe performance. Commonly used in air conditioning units, refrigeration systems, and heat pumps, it helps prevent compressor damage caused by low-pressure faults. Its reliable operation enhances system protection, improves efficiency, and supports consistent performance in commercial and residential HVAC applications.