Step Down Transformer Manufacturer in India
Purevolt India is a trusted step down transformer manufacturer in India, producing single and three phase units from 1 KVA to 1000 KVA. ISO 9001 certified, NABL tested, and exporting since 1995 to over 30 countries.
Why Your Plant or Facility Needs a Step Down Transformer
High voltage from the grid is not directly usable by most machines. It has to come down first. The wrong voltage level is the most avoidable cause of machine damage in Indian industry.
Imported Machinery Needs a Different Voltage
Machines from Germany, USA, France, or Japan are built for 220V, 110V, or 200V supply, not Indian 415V or 440V. Running them on the wrong voltage causes overheating, motor burnout, and controller damage. A step down transformer prevents all of this.
Grid Supply Is Too High for Many Loads
Most electrical equipment is rated at 230V or 240V single phase, or 200V to 240V three phase. Indian utility supply often comes in at 415V three phase. Step down transformers bridge this gap accurately at every load level.
Factory Sub-Distribution Requires Voltage Steps
Large factories receive 11kV or 33kV from the utility and step it down to 415V at the main intake. Individual sections of the plant then step it further to 240V or 200V. Step down transformers handle both levels of this distribution chain.
Equipment Damage Is Far Costlier Than Prevention
A burnt out servo drive, a failed control panel, or a damaged CNC controller costs far more than the transformer that would have kept the voltage correct. Step down transformers are a one-time investment against repeated repair bills.
How a Step Down Transformer Works
A step down transformer reduces AC voltage from a higher primary level to a lower secondary level using electromagnetic induction. The secondary coil has fewer turns than the primary, which gives a proportionally lower output voltage.
High Voltage Enters the Primary
The higher voltage AC supply connects to the primary winding. The number of turns on the primary determines the primary voltage rating.
Magnetic Field Is Created
Current in the primary winding creates a changing magnetic field in the CRGO silicon steel core. This field links both primary and secondary windings.
Lower Voltage Induced in Secondary
The secondary winding has fewer turns. Fewer turns means a lower induced voltage. The ratio of turns directly gives the ratio of voltages.
Correct Voltage Delivered to Load
The secondary delivers the stepped-down voltage to your machine or equipment. As voltage decreases, current increases proportionally, keeping power roughly constant.
Step Down Transformer Specifications & Capacity Range
| Specification | Single Phase | Three Phase |
|---|---|---|
| Capacity Range | 1 KVA – 1000 KVA | 1 KVA – 1000 KVA |
| Input Voltage | As per requirement | As per requirement |
| Output Voltage | As per requirement | As per requirement |
| Frequency | 50 Hz / 60 Hz | 50 Hz / 60 Hz |
| Cooling | Air Cooled / Oil Cooled | Air Cooled / Oil Cooled |
| Winding Material | High Grade Copper | High Grade Copper |
| Core Material | CRGO Silicon Steel | CRGO Silicon Steel |
| Efficiency | Above 98% | Above 98% |
| Insulation Class | Class F (155°C) | Class F (155°C) |
| Vector Group | N/A | Star/Delta, Delta/Star, Star/Star, Delta/Delta |
| Enclosure | Open / IP21 / IP42 / IP56 | Open / IP21 / IP42 / IP56 |
| Certifications | ISO 9001, NABL Tested, SONCAP Certified (Bureau Veritas / SGS / Intertek) | |
| Warranty | Minimum 2 years | |
| Custom Options | Any input/output voltage ratio, KVA rating, enclosure available on request | |
Features of Purevolt Step Down Transformers
- Accurate and stable voltage reduction from any input to any required output level
- Star/Delta, Delta/Star, Star/Star, and Delta/Delta winding configurations available
- CRGO silicon steel core for low iron losses and high magnetic efficiency
- High grade copper windings for minimal resistive losses and long operating life
- Air cooled for indoor and moderate KVA. Oil cooled for larger ratings and harsh sites
- Open type, IP21, IP42, and IP56 rated enclosures for indoor and outdoor use
- Suitable for balanced and unbalanced load applications
- Step down isolation transformer version available with galvanic isolation
- Digital metering option for input and output voltage monitoring
- MCCB protection and bypass options available on request
- 50 Hz and 60 Hz designs for Indian and international supply standards
- Minimum 2 year warranty, built for continuous industrial duty
Most Common Step Down Voltage Ratios We Supply
These are the configurations we build most frequently. Custom ratios are available for any requirement not listed here.
| Voltage Conversion | Typical Application |
|---|---|
| 415V to 240V (3 Phase) | Most common industrial use in India |
| 440V to 220V (3 Phase) | General industrial step down |
| 415V to 200V (3 Phase) | Japanese machinery in Indian plants |
| 480V to 240V (3 Phase) | American equipment brought to India |
| 220V to 110V (1 Phase) | Small single phase step down |
| 11kV to 415V | Distribution transformer, factory intake |
| Custom ratio | Any input to output combination on request |
Which Cooling Type Is Right for Your Application?
Both types deliver the same accurate voltage step down. The difference is in operating environment, KVA capacity, and service life under load.
- Indoor, moderate temperature environments
- Small to medium KVA (up to 200 KVA typically)
- Offices, server rooms, hospitals, schools
- CNC machines, PLCs, packaging equipment
- Clean industrial environments
- Lower upfront cost
- Outdoor and harsh environment installations
- High ambient temperature (Africa, Middle East)
- Large KVA ratings and continuous 24/7 duty
- Cement plants, steel mills, textile factories
- Export orders requiring outdoor enclosures
- Longer service life in tough conditions
Winding Configurations for Step Down Transformers
The right winding configuration depends on your supply arrangement, load type, and whether you need a neutral output. Here is what each means in plain language.
Star / Delta (Y/Δ)
Primary in star, secondary in delta. Star primary allows grounding of the neutral, which adds safety on the high voltage input side. Common in utility substations stepping down 11kV or 33kV to 415V.
Delta / Star (Δ/Y)
Primary in delta, secondary in star. Star secondary provides a neutral output, useful when connected equipment needs a neutral reference. Widely used in commercial buildings and industrial distribution.
Star / Star (Y/Y)
Both sides in star. Neutral on both input and output. Good for sensitive loads that need a very stable neutral reference on both sides of the transformer.
Delta / Delta (Δ/Δ)
Both sides in delta. No neutral on either side. Very rugged, used for heavy industrial motor loads. Can continue partial operation if one winding develops a fault. Preferred in steel plants and foundries.
Where Are Step Down Transformers Used?
Anywhere the available supply voltage is higher than what the connected machines or equipment require. These are the most common industries we supply.
How to Pick the Right Step Down Transformer
Six questions to answer before you order. Share the answers with our team and we will specify the exact unit and price within 24 hours.
Countries We Regularly Export Step Down Transformers To
We supply step down transformers across all Indian states and export to over 30 countries. ISO 9001 and SONCAP certifications are accepted in all major import markets.
Frequently Asked Questions
Clients
Trusted by MNCs, government organisations, hospitals, and industrial leaders across India and 30+ countries worldwide.
User Reviews
Real feedback from customers across Africa, the Middle East, and Asia.
Joy
Nigeria — 3 Phase Step Down Transformer
Iqbal
Saudi Arabia — Step Down Isolation Transformer
Mohammad
Iraq — Three Phase Step Down Transformer
Overseas Installations & Trade Shows
From 415V to 240V units in Indian textile mills to oil cooled step down transformers in Nigerian factories and distribution units in Saudi Arabia, Purevolt transformers run reliably in demanding environments worldwide.
See Our Manufacturing Facility
Watch how Purevolt designs, winds, assembles, and tests step down transformers at our Okhla, Delhi factory