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Bard part number 8407-058 is an OEM stepdown transformer rated 1.0 KVA with a 480V primary and 240V secondary, used to reduce incoming line voltage to the correct level for downstream components in Bard HVAC equipment. When a transformer is weak, open, or overheating, you can see nuisance trips, low voltage symptoms, or equipment that will not start reliably, so replacing it with the correct Bard-specified unit is critical for proper operation and safety. Match the primary and secondary voltages and confirm the KVA rating and mounting/wiring configuration against your unit wiring diagram before ordering to ensure proper fit and electrical compatibility.