208V to 240V Buck-Boost Transformer
Boosting a 208V service to run 240V-rated equipment? Two questions and we'll hand you the exact unit — in stock.
1
Phase
Single-Phase
Most residential & light commercial services
Three-Phase Delta
3-wire delta system
Three-Phase Wye
4-wire wye system
2
Load current (amps)?
✔ Recommended for your application
Sizing uses the correction winding only. Verify load current against the equipment nameplate and install per the included wiring diagram and applicable NEC requirements.
Why 208V equipment problems happen
Equipment rated 240V running on a 208V service sits at the bottom of its acceptable voltage range. Any sag during compressor startup or peak load pushes it below spec — the equipment runs hotter, draws more current, and fails early. A buck-boost transformer wired in boost configuration raises 208V to 240V and puts the equipment back in the middle of its safe operating zone.
Every unit above is resin encapsulated, NEMA 3R rated for indoor or outdoor mounting, and cETLus listed.
Common questions
- Can I use a single-phase buck-boost on a three-phase system?
- Yes — delta systems use two units in open-delta configuration; wye systems use three. The selector above sizes the bank for you.
- Why is the transformer kVA so much smaller than my load?
- In an autotransformer connection the unit only carries the correction portion, not the full load — so a small-kVA unit corrects a much larger connected load.
- What if my exact voltage isn't listed?
- Use the sizing calculator or request a quote — custom configurations and other voltage pairs are available.