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Bard part number 8407-017 is an OEM buck boost transformer used to correct supply voltage between 230V and 208V so Bard wall mounted HVAC equipment can run within its intended electrical range. This electrical component helps protect motors, contactors, and compressors from nuisance trips and performance issues that can show up when a unit is fed with the wrong nominal voltage. For best results, confirm your unit model and the required buck or boost wiring configuration from the Bard wiring diagram or service manual before ordering or installing, since buck boost transformers are field wired to match the application.