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Bard part number 8407-031 is a 75 VA control transformer used in Bard wall-mount HVAC equipment to step down 208 to 240 volt incoming power to a 24 volt AC control circuit. This OEM transformer supplies stable low-voltage power for components like contactors, relays, and control boards, helping prevent nuisance failures caused by incorrect voltage or undersized transformers. Match the primary voltage and VA rating to your unit and wiring diagram, and replace any damaged spade terminals or wire connectors during installation to ensure a reliable connection.