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The Bard 8407-003 stepdown transformer is an OEM 1.5 kVA unit designed to reduce incoming 480/240V power to the proper voltage required by specific Bard wall mount and packaged HVAC electrical systems. If your unit has control or accessory power issues tied to incorrect supply voltage, a failing stepdown transformer can cause nuisance faults, no-start conditions, or unreliable operation. Replacing with the correct Bard 8407-003 helps maintain proper voltage to downstream components and supports safe, stable system performance when matched to the unit model and wiring diagram.