Low Voltage Dry Transformer

1250kVA oil immersed transformer,
33/0.4kV transformer
OLTC transformer
1250kVA oil immersed transformer,
33/0.4kV transformer
OLTC transformer

SG Series Three Phase Low Voltage Dry Isolation Transformer with Optional IP20 Cabinet

SG Series Three Phase Low Voltage Dry Isolation Transformer is designed for industrial power isolation and voltage conversion, with both primary and secondary voltages below 1 kV. Its open varnished copper winding structure allows convenient inspection and maintenance, while the optional IP20 metal cabinet provides additional protection against accidental contact and solid objects in indoor installations.

With stable electrical performance and flexible voltage customization, it is suitable for CNC machines, automation systems, industrial workshops, precision equipment and complete machinery export projects. Capacity ranges from 3 to 2000 kVA.


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Basic Info.

SG Series three phase low voltage dry isolation transformer is designed for industrial power isolation and voltage conversion, with both primary and secondary voltages rated below 1 kV.


It adopts high-purity copper windings with vacuum-impregnated insulation and a reinforced metal clamping frame with tension bolts. The open winding structure allows convenient visual inspection and maintenance, while standard air natural cooling provides reliable heat dissipation during normal operation.

IP20 Protective Cabinet


The transformer can be supplied with an optional IP20 metal enclosure according to project requirements. The cabinet provides:


For projects requiring additional personnel protection or a complete enclosed unit, the IP20 cabinet version is recommended. The open type remains available for installation inside closed machinery cabinets or equipment enclosures where external protection is already provided.


Performance parameters for reference

ItemSpecification
Product TypeThree Phase Low Voltage Dry Isolation Transformer
Core MaterialHigh-permeability grain-oriented silicon steel
Rated Capacity3–2000 kVA or customized
Rated VoltageBelow 1 kV, common 400V / 208V / 230V / 440V / 660V
Frequency50 Hz / 60 Hz
Vector GroupDyn11, Yyn0
Insulation ClassClass F / Class H optional
Cooling MethodAN (Air Natural); cooling fan optional for heavy-load conditions
EnclosureOpen Type / Optional IP20 Protective Cabinet
ApplicationPower Isolation / Voltage Conversion



Contact us
IP20 Cabinet vs. Open Type — Which Configuration Should You Choose?
ItemOpen TypeIP20 Cabinet Version
Best ForInstallation inside closed machinery cabinets or control panelsWorkshop areas, equipment rooms and standalone installation
Personnel ProtectionRequires surrounding enclosure for touch protectionProvides additional protection against accidental contact
Solid Object ProtectionNo external enclosure protectionProtection against solid objects ≥12.5 mm
Maintenance AccessDirect access for winding inspectionCabinet door provides access for inspection
AppearanceBare transformer with clamping frameComplete transformer unit with protective enclosure
Typical CustomersOEM integrators with their own cabinetsEPC contractors, end users and complete machinery exporters

Recommended Selection

Choose the Open Type when the transformer will be installed inside a closed machinery cabinet, control panel or equipment enclosure that already provides the required external protection.

Choose the IP20 Cabinet Version when the transformer will be installed as a standalone unit in a workshop, equipment room or other indoor area where additional personnel and solid-object protection is required.


Typical Applications

  1. Automation production lines, CNC machine tools and robotic equipment — power isolation and noise suppression

  2. Medical equipment, laboratory and precision instruments — anti-interference stable power supply

  3. Industrial workshops — voltage conversion between different standard voltage systems (e.g. 400V to 208V, 400V to 230V)

  4. Complete machinery export — supporting power transformation for overseas installation, IP20 cabinet recommended for site readiness

  5. Data center auxiliary power — low voltage harmonic suppression and isolation

  6. Indoor factory and equipment room installation — IP20 cabinet version for safety compliance


Frequently Asked Questions

Q1: What is an SG Series low voltage dry isolation transformer with an IP20 cabinet?

It is a three phase low voltage dry transformer designed for electrical isolation and voltage conversion, with both primary and secondary windings rated below 1 kV. The transformer uses an open varnished winding structure and can be supplied with an optional IP20 metal protective cabinet.


Q2: What is the difference between an SG transformer and an SCB cast resin dry transformer?

The SG Series is a low-voltage open varnished dry transformer designed mainly for electrical isolation and voltage conversion, with both primary and secondary windings rated below 1 kV.

The SCB Series is a cast resin dry transformer generally used for medium-voltage power distribution, with a primary voltage of 10 kV or higher depending on the model.

The two product series are designed for different voltage levels and application requirements.


Q3: When should I choose the IP20 cabinet version?

The IP20 cabinet version is recommended for standalone indoor installation in workshops, equipment rooms and other areas where additional protection against accidental contact and solid objects is required.

The open type is more suitable when the transformer will be installed inside a closed machinery cabinet, control panel or equipment enclosure that already provides external protection.


Q4: What voltage ratios are commonly available?

Common voltage configurations include 400V to 400V, 400V to 208V, 400V to 230V, as well as other low-voltage combinations such as 440V and 660V.

Custom voltage ratios can be designed according to equipment and project requirements.


Our Service

  • Custom-made transformer solutions according to project voltage and capacity requirements

  • Optional IP20 protective cabinet for standalone indoor installation

  • Flexible primary and secondary voltage customization

  • Technical support for OEM integrators, EPC contractors and end users

  • Complete documentation for overseas project submission

  • English test reports, wiring diagrams and installation manuals

  • Strict routine factory testing before delivery

  • Global technical consultation and after-sales support

  • Short lead time for standard configurations


Send us your voltage ratio, capacity and installation requirements. Our technical team will provide a preliminary proposal and technical documents according to your project requirements.

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