350 kVA Servo Voltage Stabilizer
The 350 kVA Servo Voltage Stabilizer is engineered for mission-critical industrial applications. Delivers exceptional voltage stability with advanced servo-motor technology.
Ref. SVS-350-3PH · Lead time 3–4 weeks · Made to order from Hapur
See full engineering specification & variants
Key Features
Recommended For
Specifications
| Specification | Value |
|---|---|
| Capacity | 350 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 | 1400 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 350 kVA specifically, not the range in general.
487 A per phase
At 415 V three-phase, 350 kVA works out at roughly 487 A per phase. At 487 A you are normally into parallel cable runs per phase rather than a single conductor. Confirm the terminal chamber accepts the number of runs your cable schedule calls for — discovering it does not, on the day of commissioning, is the most common reason installations at this rating slip.
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 97 kVA of the 350 kVA throughput. Below 300 V it runs out of range, and the answer is a wider-window build, not more kVA.
< 20 ms
At this rating the stabilizer is feeding a whole section of the floor, so < 20 ms determines whether one machine's inrush propagates into every other machine on the same board. That is the mechanism behind most "random" tripping complaints we are called out to.
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. At 350 kVA the practical constraint is usually the largest single motor rather than the total: size against that starting current, not against the sum of the nameplates.
Sizing Guide
When is 350 kVA the right choice?
350 kVA is a common size in the sugar and distillery sector, where multi-stage centrifuges, large pumps, and process heaters run continuously. It is also specified for telecom tower clusters where a single feeder serves 15–20 towers with outdoor BTS equipment and battery backup systems. From a grid perspective, 350 kVA sits at the threshold where some DISCOMs require the installation to have a separate metering point — which means the stabilizer must handle the full metered demand cleanly and the connected equipment must not push PF below 0.9 or face dual penalty (low PF and transformer utilisation surcharge).
Before you order
Where 350 kVA goes in, and what the site needs
Typical installations
We supply 350 kVA most often into large manufacturing facilities, steel mills, automotive manufacturing and textile mills, alongside paper manufacturing and power distribution substations. 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 1,400 kg this is forklift work, and the forklift has to be rated for 1,400 kg at the extended reach that placement requires. Confirm floor loading before it arrives — a ground-floor workshop slab is normally adequate, a mezzanine generally is not. 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 350 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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Send us your kVA requirement, supply voltage range, and site conditions. Our engineer will confirm whether this configuration is correct for your installation, or specify an alternative if needed. No distributors — direct from our factory in Hapur.
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