50 kVA Servo Voltage Stabilizer
Our 50 kVA Servo Voltage Stabilizer offers reliable power conditioning for medium-sized industrial facilities. Delivers precise ±1% voltage regulation with fast servo motor response.
Ref. SVS-50-3PH · Lead time 1 week · Made to order from Hapur
See full engineering specification & variants
Key Features
Recommended For
Specifications
| Specification | Value |
|---|---|
| Capacity | 50 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 | 240 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 50 kVA specifically, not the range in general.
70 A per phase
At 415 V three-phase, 50 kVA works out at roughly 70 A per phase. A single four-core run per phase carries this comfortably. Size the cable and upstream MCCB for 87 A continuous — the 25% margin covers the harmonic content that switched-mode loads push back onto the supply, which a nameplate-sized cable will run warm on.
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 14 kVA of the 50 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 is quick enough that connected electronics never see the dip as an interruption. At this size the unit usually sits ahead of one machine or a small bench, where a slow correction shows up as a reset rather than a trip.
125% for 1 hour
Direct-on-line starting draws six to eight times full-load current for a few seconds, and 125% for 1 hour is the margin that absorbs it. Keep steady-state load below about 80% of 50 kVA so this headroom is still available when the largest motor starts.
Sizing Guide
When is 50 kVA the right choice?
50 kVA is the right starting point for an electronics assembly unit, a small injection moulding shop with one or two machines, or a printing press running a single 4-colour offset. At 50 kVA, air cooling is sufficient — the heat load stays well within what natural convection can handle without fans, making it a quieter and more maintenance-free installation than oil-cooled units of larger size. This rating is also common as a dedicated stabilizer for server room isolation in manufacturing plants, where the IT load (UPS input, switches, cooling) is kept on a separate protected circuit away from the main production feeder.
Before you order
Where 50 kVA goes in, and what the site needs
Typical installations
We supply 50 kVA most often into small to medium manufacturing, electronics assembly facilities, textile mills and hvac systems, alongside industrial testing labs and printing facilities. 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 240 kg two people and a pallet truck will position this. The practical constraint is the doorway and any step or threshold on the route, not the weight itself. 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 50 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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