20KVA isolation transformer 3 phase step down

20KVA isolation transformer 3 phase step down

20KVA isolation transformer designed to step down or step up 3-phase voltage to usable range.

For example step down 480V to 208V. Dry-type transformers are affordable, can be used in any equipment, and are very safe.

The primary and secondary windings of the isolation transformer are separated by an aluminum/copper shielding layer, and are widely used in various power supply places with a frequency of 50Hz/60Hz.

High quality and safe isolation transformer 20KVA isolation transformer is manufactured and supplied by Shuogong Power, a leading transformer company in China.

The rated power is 20KVA and it is suitable for 3 phase electricity. If you need to use it for single phase electricity, we also have corresponding product models.

20KVA three phase isolation transformer is a three phase dry type transformer, its function is to step down, and the primary and secondary windings are insulated separately.


Three phase
Input voltage
220V 380V 400V 415V 440V 480V 660V  or Customized
Output voltage
660V 480V 440V 415V 380V 220V or Customized
Output voltage accuracy
Voltage change rate
Output waveform distortion
No distortion (compared to the input waveform)
Insulation class
Class F, Class H; IP 00, IP30 etc.
Working efficiency
Applicable frequency
Dielectric strength
Connection method
Yyn0  DYn11 or Customized
Overload capability
More than 1.2 times of the rated load to work for 4 hours
Sound level
≤50dB(within 1m)
Temperature rise
Insulation resistance
Working environment
Temperature: -20℃~+45℃, Humidity: ≤95% RH no condense
Installation environment
Non-corrosive gas and conductive dust
Cooling method
Dry type air cooling


Transformer can only convert voltage and CANNOT convert frequency.
Transformer CANNOT convert single phase voltage to 3 phase voltage.
Input/output voltage, power rating and whether with shell of all transformers, can be customized according to clients’ requirements.

20KVA 3 phase isolation transformer price:

The retail price of a 20KVA three phase transformer on the market is usually $3700-4000.

Here you will get exclusive deals from transformer manufacturers.

Contact us today for a discounted price on your 20KVA three phase isolation transformer.

The following is the price of 20KVA 3 phase isolation transformer currently on the market, which is for your reference only.

Items Price  Capacity source
20kVA 3 phase isolation transformer price $3853.97 380V to 190V Ato
20kVA 3 phase isolation transformer price $3787.11 480V to 208V Amazon
20kVA three phase isolation transformer price $3899.12 480V to 240V Ebay

Tips: Benefits of using isolation transformers

1. Reduces Surges

A power surge happens when the input voltage in devices exceeds the required level. A surge can damage all appliances and electronics plugged into power.

An isolation transformer minimizes power surges. It insulates DC signals from the power source to allow equipment to function without interruptions, therefore reducing the chance of property damage from power surges.

2. Enhances Safety

Assured safety is the most notable benefit of isolation transformers. At times, touching electrical devices can lead to dangerous electric shocks. An isolation transformer completes the power source’s circuit, protecting you from electric shocks.

3. Increases Power Quality

An isolation transformer improves the quality of power on equipment. The transformer uses a Faraday shield to reduce potential current leakage. Electrical devices in the home or business use all current coming from the power source. With an isolation transformer, importance equipment can achieve optimal performance.

4. Reduces Noise

Electrical noise impacts the performance of a machine by interfering with the signals. It comes from unwanted electrical signals that enter into power and signal circuits.

An isolation transformer reduces electrical noise in electrical devices. The Faraday shield in the transformer prevents electric fields from interfering with power flow. Thus, unwanted currents cannot interrupt power and signal circuits in equipment.


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