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The Bard 8407-015 is an OEM control transformer used in Bard wall-mounted HVAC equipment to step down line voltage to 24 VAC for the low-voltage control circuit. It is rated at 55 VA with a 240V primary and 24V secondary, making it a solid choice when you are troubleshooting no 24-volt power to the thermostat circuit, contactor coil, relays, or control board. Using the correct VA rating helps prevent nuisance failures from undersized transformers, and choosing a genuine Bard replacement helps ensure proper mounting, wiring lead configuration, and electrical compatibility with the factory control setup.