Voltage Regulation & Power Quality
Single-phase and three-phase voltage stabilizers compared
When a single-phase or a three-phase voltage stabilizer fits, and how balanced and independent phase control differ on three-phase units.
| Criterion | Single-phase stabilizer | Three-phase, balanced control | Three-phase, independent phase control |
|---|---|---|---|
| Nominal output | 230 V AC | 400 or 415 V AC | 400 or 415 V AC |
| Typical load | Single-phase loads on one circuit | Balanced three-phase loads such as motors | Mixed single-phase loads on a three-phase supply |
| How correction is applied | One phase | All phases corrected together from one measurement | Each phase measured and corrected separately |
| Response to phase unbalance | Not applicable | Limited; phases are corrected by the same step | Corrects each phase to its own setting |
| Typical input window | 170–270 V AC | 340–480 V AC | 340–480 V AC |
| Rating | Typically up to 25 kVA (servo) | Up to 500 kVA | Up to 500 kVA |
Typical input windows follow the product pages; the window for a given unit is confirmed against the recorded site voltage. Ratings are proposed from the load and supply data, not chosen from this table.
See Servo Voltage Stabilizers for the specification rows, or discuss your requirement with the load list and phase-wise voltage record.
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