125 kVA Servo Voltage Stabilizer
Our 125 kVA Servo Voltage Stabilizer combines compact design with robust performance. Ideal for growing manufacturing operations requiring precise voltage regulation with servo motor accuracy.
Ref. SVS-125-3PH · Lead time 2 weeks · Made to order from Hapur
See full engineering specification & variants
Key Features
Recommended For
Specifications
| Specification | Value |
|---|---|
| Capacity | 125 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 | 510 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 125 kVA specifically, not the range in general.
174 A per phase
At 415 V three-phase, 125 kVA works out at roughly 174 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 217 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 35 kVA of the 125 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 125 kVA so this headroom is still available when the largest motor starts.
Sizing Guide
When is 125 kVA the right choice?
125 kVA is chosen when a 100 kVA unit is too close to full load and a 150 kVA would be oversized. In practice this means facilities with a 100A TPN incomer that are already at 85–90% utilisation and anticipate adding one more machine or production shift. Food processing plants where one large 37 kW mixer or extruder was added after the original stabilizer was purchased frequently need this exact intermediate size. It is also the standard rating for hospitals when the stabilizer covers the full OT complex (2–3 theatres plus anaesthesia equipment and surgical lighting) without including the CSSD or diagnostic wing.
Before you order
Where 125 kVA goes in, and what the site needs
Typical installations
We supply 125 kVA most often into manufacturing plants, food processing units, pharmaceutical facilities and automotive suppliers, alongside industrial assembly lines and power distribution centers. 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 510 kg you need a pallet truck at minimum and a level, load-spreading base. Check the route for ramp gradients — a hydraulic truck carrying 510 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 125 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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