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Bard part 8406-061 is an OEM auto reset low pressure switch used in Bard wall-mounted air conditioners and heat pumps to help protect the refrigeration system by opening the safety circuit if suction pressure drops below the designed limit, then automatically restoring operation once pressures return to normal. This type of control is commonly tied to loss-of-charge and freeze protection logic, so using the correct Bard replacement helps keep safeties calibrated and wiring connections consistent with the factory build. Note: 8406-061 is listed as obsolete, and Bard identifies 1804-0107 as the official replacement low pressure control assembly, so confirm your unit model and serial number before ordering.