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• S8407-042 OBSOLETE

• Transformer 480/24Vac 50 Va

Bard S8407-042 is an OEM control transformer used in Bard wall-mounted HVAC equipment to step down a 480V primary supply to 24VAC at 50 VA for the unit’s low-voltage control circuit. When a transformer is weak or failed, symptoms often include a dead thermostat circuit, chattering contactors, or intermittent control power, so replacing it with the correct Bard-specified transformer helps restore stable 24V operation and proper sequencing of relays, contactors, and safety controls. Online parts references indicate S8407-042 is the official replacement for the older 8407-042 transformer, so confirm your unit’s voltage and wiring match before ordering to ensure proper fit and safe operation.