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100kva-500kva 3 Phase Indoor Low Voltage Dry Type Isolation Transformer
Indoor Dry Type Transformer

DG 3kva-30kva Single Phase Dry Type Auto Transformer

Single Phase Auto Transformer is a transformer in which single winding is used to achieve two functions. Unlike other isolation-type transformers, it does not offer isolation; however, it is an efficient solution in terms of cost and space.

For the DG series of Auto Coupling Type “Q,” part of the winding is shared between input and output in order to save material; however, it delivers excellent voltage regulation and efficiency. This is because it is used in situations where isolation is not required.

SKU： SG-1 Categories: ,

$59.00

The DG 3kVA–30kVA Single Phase Dry Type Auto Transformer is engineered using a hole-row winding method combined with vacuum impregnation technology, ensuring insulation meets Class F or H standards. This guarantees durability, thermal resistance, and long-term operational stability.

Type designation

MODEL: □DG□
□ None: lsolation, Q: Autocoupling
S D: Single-phase  S: Three-phase
G Dry-type transformer
□ Power KVA

Key Advantages

1. High Efficiency & Energy Saving
Reduced copper and core losses due to shared winding
Lower operational costs over time

2. Compact & Lightweight Design
Smaller footprint compared to isolation transformers
Ideal for installations with limited space

3. Superior Insulation & Durability
Vacuum impregnation ensures:
Moisture resistance
Enhanced dielectric strength
Insulation class: F (150°C) or optional H class

4. Stable Output Performance
No waveform distortion compared to input

5. Low Noise Operation
≤35dB at 1 meter
Suitable for noise-sensitive environments

6. Strong Overload Capability
Ensures reliability under fluctuating loads

Main technical parameter

Dimensions with housing

Model NO. DG
Capacity 500VA   3KVA 10KVA   15KVA   20KVA   25KVA   30KVA   50KVA  80KVA   100KVA
Phase Single phase
Voltage Accuracy ±1%
Voltage variation rate ≤1.5%
Waveform Distortion No distortion (compared to input waveform)
Insulation Grade Class F,High Temperature Resistance 150°
Efficiency Inductive (Isolated) ≥99%
Resistance to Electricity 2000VA/1min
Overload capacity Allowed to exceed 1.2 times rated load
Cooling method Dry air-cooled
Connection method Y / △ combination
Insulation Resistance ≥150MQ
Work Efficiency Inductive (isolated)>99%
Dielectric Strength 2000VA/1min
Design Life 30 years
Noise ≤35dB (within one meter)
Frequency 50/60Hz
Working Environment Temperature:-20~+45°C Humidity:≤95% RH does not condense
Workplace Non-corrosive gas and conductive dust
Safety Standard Products comply with international national standards such as VDE0550. IEC439JB5555,GB226
Stocking Situation The 3~30KVA standard models are available in stock, and all specifications are producedin a standardized manner.

Product specifications

Product analysis

Ac transformer
① Input Voltage ② Output Voltage ③ Indicator light ④ Chassis switch trip lock ⑤ Heat sink
EI Dry-type transformer

EI type transformer

 Dry-type transformer digital display

digital display

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