25 kVA Distribution Transformer (11kV)
Reliable 25 kVA distribution transformer stepping down 11kV to 415V for small industrial and commercial installations. Features efficient core design and robust construction for outdoor/indoor deployment.
Ref. DIST-25-11KV · Lead time 4–5 weeks · Made to order from Hapur
See full engineering specification & variants
Key Features
Recommended For
Specifications
| Specification | Value |
|---|---|
| Capacity | 25 kVA |
| Primary Voltage | 11000V (±5%) |
| Secondary Voltage | 415V (±5%) |
| Frequency | 50 Hz |
| Cooling Method | both air and oil cooled |
| Copper Loss | ~500W |
| Iron Loss | ~250W |
| Weight | 800 kg |
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 25 kVA specifically, not the range in general.
2,190 kWh/year
Iron loss of 250 W is drawn whenever the transformer is energised, whether or not anything is connected. Over a year that is 2,190 kWh — about ₹17,520 at ₹8/kWh. It is the figure worth comparing between quotes, because you pay it for the full 25-year life regardless of load.
96.8%
At full load and 0.9 power factor, total losses of 750 W give roughly 96.8% efficiency. Copper loss varies with the square of load, so a transformer run at half capacity dissipates about a quarter of that 500 W — oversizing costs you standing loss, not copper loss.
11000V
An 11 kV primary at this rating is the smallest HT connection that makes commercial sense. Below it the switchgear, metering and operator requirement usually outweigh the tariff benefit, and an LT connection from the DISCOM is the cheaper answer.
Running-cost figures assume a reference industrial tariff of ₹8/kWh and continuous energisation. Substitute your own tariff and duty hours for a site-specific number — we will run it with you on request.
Sizing Guide
When is 25 kVA the right choice?
25 kVA is the smallest practical HT connection. It suits a site that needs its own transformer for supply reliability or tariff reasons rather than for load — a small industrial plot, a residential colony's common services, a pump house or telecom installation, a campus block. Below this rating an LT connection from the DISCOM is almost always cheaper once you count 11 kV switchgear, HT metering and the licensed operator the connection requires. Above roughly 20 kVA of steady load, look at the 63 kVA unit instead: a distribution transformer run continuously near its nameplate has no margin for the load growth every site eventually has, and no headroom for motor starting.
Before you order
Where 25 kVA goes in, and what the site needs
Typical installations
We supply 25 kVA most often into small industrial parks, commercial complexes, residential colonies and school/college campuses, alongside hospital power distribution and retail shopping centers. What separates those sites is load factor. A transformer serving a steady process load and one serving a facility with a sharp evening peak have very different loss profiles over a year, even at an identical nameplate rating.
Site preparation
At 800 kg this is forklift work, and the forklift has to be rated for 800 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.
Statutory requirements
A 11 kV primary connection falls under CEA safety regulations: approved HT switchgear, earthing and statutory clearances, drawings submitted to the electrical inspector, and a certified operator for switching. Build that approval time into your programme — it routinely exceeds our 4–5 weeks manufacturing lead time, and it is the step that delays energisation far more often than the transformer does.
Adjacent ratings
If 25 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.
63 kVA Distribution Transformer (11kV)
63 kVA distribution transformer for medium-scale power distribution.
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View specificationDistribution Transformer250 kVA Distribution Transformer (33kV)
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View specificationAlso in the transformer range
Different equipment rather than a different size — often specified alongside this on the same project.
20 kVA Three-Phase Isolation Transformer
Three-phase 20 kVA isolation transformer for medium-load equipment protection.
View specificationIsolation Transformer10 kVA Single-Phase Isolation Transformer
High-isolation single-phase transformer for sensitive electronic equipment protection.
View specificationUltra-Isolation Transformer50 kVA Three-Phase Ultra-Isolation Transformer
Industrial three-phase ultra-isolation transformer with advanced noise suppression.
View specificationEngineering detail on this configuration
The distribution transformer 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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