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The Bard 8407-068 transformer is an OEM 50 VA control transformer used in Bard wall-mounted HVAC units to step down 208/240 VAC input power to 24 VAC for the low-voltage control circuit. A properly functioning transformer helps ensure stable operation of key components such as relays, contactors, and control boards, and this part is commonly referenced with an integrated 2 amp circuit breaker for added control-circuit protection. If you are troubleshooting no-24V issues, nuisance control fuse trips, or intermittent control power, replacing the control transformer with the correct Bard OEM 8407-068 is a reliable way to restore proper unit operation; confirm your unit model and wiring match 208/240 to 24V, 50VA requirements before ordering.