This Burnham Commercial Pressure Switch is a precision instrument designed to monitor and control the pressure in various commercial applications. The device operates at a specific pressure setting of 0.68 inches of water column (wc), which is a standard measure of pressure in the HVAC industry. The switch features a robust construction for durability and reliability, ensuring consistent performance even under demanding conditions. It functions by activating or deactivating an electrical circuit when the monitored pressure reaches a predetermined level, thereby maintaining optimal system operation. This pressure switch is an essential component in many commercial systems, including heating, ventilation, and air conditioning (HVAC) systems, where it helps to safeguard against potential overpressure or underpressure situations.