The decision: matching voltage direction before you convert power
When you're sorting through inverters power conversion options, the first question is always direction. These two new autotransformers handle opposite directions. One steps a higher-voltage feed down to the load level; the other steps a lower-voltage feed up to the equipment level. Pick the wrong one and you'll have a converter that can't produce the voltage your setup expects. Both are built for the same capacity class, so this decision is about direction, not capacity.
Quick verdict
If your incoming supply is on the high side of the pair and your equipment is on the low side, choose the step-down transformer. If your incoming supply is on the low side and your equipment is on the high side, choose the step-up transformer. Both list at USD 950.00, so cost won't separate them-direction will.
Side-by-side snapshot
| Attribute | 30kVA Step-Down Transformer 480V to 208V | 30kVA Step-Up Transformer 208V to 480V |
|---|---|---|
| Listed price | USD 950.00 | USD 950.00 |
| Conversion function | Step-down | Step-up |
| Primary / secondary | 480 V / 208 V | 208 V / 480 V |
| Condition | New | New |
| Frequency | 60 Hz | 60 Hz |
| Phases | 3 | 3 |
| Load capacity | 24 kVA resistive / 18 kVA inductive | 24 kVA resistive / 18 kVA inductive |
Where each model wins
The step-down model wins when your line voltage comes into the unit at the higher end and your loads are designed for the lower end. It's the one that lowers the feed to match downstream equipment. The step-up model wins when you have a lower-voltage feed available and need to drive higher-voltage equipment. It raises the voltage to the level the load expects. The tie-breaker is simply which side of the transformer your supply sits on.
Product notes
30kVA Step Down Transformer 480V to 208V Industrial Power Converter - NEW
This XING Laser unit is built for the step-down side of a three-phase autotransformer application. It's designed to convert from a higher AC supply to a lower AC load, using an AC-to-AC topology. The enclosure measures 20.5 by 17.0 by 21.5 inches and carries a listed gross weight of roughly 100 kg. Built-in ventilation supports heat dissipation during continuous operation. The step-down role is its core strength: when the incoming line runs at the upper voltage and the equipment expects the lower voltage, this is the unit that matches them. The limitation is directional: this model steps voltage down only. If your setup needs the opposite direction, the step-up transformer is the matching choice.
30kVA Step Up Transformer 208V to 480V Industrial Power Converter 3 Phase
This converter handles the opposite direction: it accepts a lower-voltage AC input and raises it to a higher-voltage AC output for the load. It shares a similar physical footprint-20.5 by 17.0 by 21.5 inches-and a listed gross weight of about 100 kg, with built-in ventilation included for continuous operation. The converter is designed for line-voltage matching jobs, so it fits the same kind of application as the step-down unit. The limitation is directional: this unit steps voltage up only. If your incoming power is already on the higher side and your equipment needs the lower side, you'll want the step-down model instead.
Final choice by use case
- 480V supply, 208V equipment: choose the step-down transformer.
- 208V supply, 480V equipment: choose the step-up transformer.
- Your voltage direction is the deciding factor.
