150 kVA Servo Voltage Stabilizer
The 150 kVA Servo Voltage Stabilizer bridges mid-range and heavy-duty operations. Perfect for growing manufacturing plants needing reliable power conditioning without excessive footprint.
Ref. SVS-150-3PH · Lead time 2 weeks · Made to order from Hapur
See full engineering specification & variants
Key Features
Recommended For
Specifications
| Specification | Value |
|---|---|
| Capacity | 150 kVA |
| Input Voltage | 300V–470V, 3-Phase |
| Output Voltage | 415V ±1% |
| Frequency | 50/60 Hz |
| Response Time | < 20 ms |
| Cooling Method | both air and oil cooled |
| Weight | 600 kg |
| Warranty | 3 years |
Reading the specification
What these numbers mean for your installation
A datasheet tells you what the unit does. This is what each figure changes about how you specify, feed and site it — worked out for the 150 kVA specifically, not the range in general.
209 A per phase
At 415 V three-phase, 150 kVA works out at roughly 209 A per phase. Terminate this into the stabilizer's own cable chamber via a gland plate. Check the plate is drilled for your cable diameter before delivery, and size the upstream breaker at 261 A so the protection device is never the limiting element in the feed.
300V–470V
The unit holds output at 415V ±1% anywhere between 300 V and 470 V in. Pulling a 300 V supply back up to 415 V means adding 115 V — a 38% lift on the incoming supply, with the series winding carrying roughly 42 kVA of the 150 kVA throughput. Below 300 V it runs out of range, and the answer is a wider-window build, not more kVA.
< 20 ms
< 20 ms matters more than the ±1% accuracy figure for most buyers. The failure that actually costs you is a drive faulting on undervoltage when a large motor elsewhere on the feeder starts, and correction inside < 20 ms is what prevents it.
150% for 30 minutes
Direct-on-line starting draws six to eight times full-load current for a few seconds, and 150% for 30 minutes is the margin that absorbs it. Keep steady-state load below about 80% of 150 kVA so this headroom is still available when the largest motor starts.
Sizing Guide
When is 150 kVA the right choice?
150 kVA is specified when a 100 kVA unit would run at 90%+ load continuously — a situation that shortens servo motor life and limits headroom for load expansion. Automotive tier-2 suppliers running stamping lines with 3–4 presses, pharmaceutical plants with clean-room HVAC systems plus packaging equipment, and large commercial kitchens with industrial refrigeration all cluster in the 120–150 kVA connected load range. This is also the first size where oil cooling becomes the preferred default for continuous 24×7 operations, since the thermal cycling on an air-cooled unit at sustained high load accelerates insulation degradation.
Before you order
Where 150 kVA goes in, and what the site needs
Typical installations
We supply 150 kVA most often into large manufacturing plants, automotive parts suppliers, food & beverage processing and pharmaceutical plants, alongside industrial distribution centers and heavy-duty assembly lines. What separates those sites is duty cycle rather than load. A rating that runs cool on single-shift work sits near the top of its thermal range on a continuous three-shift line, and that is the point at which oil cooling stops being optional.
Site preparation
At 600 kg you need a pallet truck at minimum and a level, load-spreading base. Check the route for ramp gradients — a hydraulic truck carrying 600 kg will not climb much of one. Leave working clearance on the terminal side for cable entry and inspection. Sustained ambient above 45 °C, or an enclosed room without cross-ventilation, requires derating — send us the room conditions and we will confirm the rating still holds where you intend to put it.
Adjacent ratings
If 150 kVA is not the right size
Sizing rarely lands exactly on a catalogue rating first time. These are the ratings either side of it in the same range — compare the specification before you commit.
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View specificationEngineering detail on this configuration
The servo voltage stabilizer pages carry the full design rationale, comparison tables and application notes behind this SKU.
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