450 kVA Servo Voltage Stabilizer
The 450 kVA Servo Voltage Stabilizer is built for demanding industrial environments. Features premium servo technology with maximum reliability for continuous operation.
Ref. SVS-450-3PH · Lead time 3–4 weeks · Made to order from Hapur
See full engineering specification & variants
Key Features
Recommended For
Specifications
| Specification | Value |
|---|---|
| Capacity | 450 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 | 1755 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 450 kVA specifically, not the range in general.
626 A per phase
At 415 V three-phase, 450 kVA works out at roughly 626 A per phase. At 626 A cable becomes awkward and expensive; most installations at this rating land on a busduct or a bolted busbar connection straight from the LT panel. Size the neutral deliberately as well — with the non-linear loads typical at this scale, triplen harmonics can put more current in the neutral than in any phase.
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 125 kVA of the 450 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 across a plant-level load means the servo is tracking a constantly moving target — every shift change and every large start moves it. Correction this fast is what keeps the whole facility inside tolerance rather than just the sensitive end of 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. At 450 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 450 kVA the right choice?
450 kVA suits installations where a 400 kVA unit would operate above 90% load continuously and leaving only 10% headroom for load growth is unacceptable. Spinning mills with ring frame machines, large automotive dealership service centres with multiple vehicle lifts and spray booths, and airport ground service equipment charging facilities all fall into this band. At 450 kVA, remote monitoring via RS-485 Modbus becomes particularly important — at this scale, a maintenance team cannot physically check the stabilizer's operating point every day, and automated alerts for high input deviation, overtemperature, or abnormal load are operationally necessary.
Before you order
Where 450 kVA goes in, and what the site needs
Typical installations
We supply 450 kVA most often into large manufacturing facilities, steel mills, chemical processing and automotive manufacturing, alongside textile mills and industrial power 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 1,755 kg you are into hydra or gantry territory for the final lift, onto a plinth cast for the purpose. The unloading point matters as much as the destination: plan where the truck stands and how the 1,755 kg travels the last few metres, because that gap is where most delivery-day problems happen. 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 450 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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