Step-up/Step-down Auto Transformer
An Auto Transformer is a type of electrical transformer where a portion of the winding acts as both the primary (input) and secondary (output) winding. Unlike isolation transformers, auto transformers do not provide electrical isolation between input and output circuits. They are commonly used to step up (increase) or step down (decrease) AC voltage levels efficiently and cost-effectively.
Auto transformers are ideal for applications where electrical isolation is not required, but voltage adjustment is necessary—offering higher efficiency, smaller size, and lower cost compared to conventional two-winding transformers of the same rating.
Product Details
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Features
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Specification
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Capacity Range
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1 kVA to 10,000 kVA (as per customer requirement)
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Input Voltage
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Customizable (e.g., 800V/690V ±1%)
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Output Voltage
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Customizable (e.g., 415V ±1%)
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Frequency
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50 Hz / 60 Hz ±3%
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Vector Group
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Dyn11, Yy11 (as applicable)
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Core Construction
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CRGO, Rectangular Core
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Winding Technique
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Multiple parallel conductors to reduce skin effect
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Impedance Voltage
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3–4%
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Voltage Regulation
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3–4%
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Insulation Resistance (IR)
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>1000 MΩ
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Dielectric Strength
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2.5 kV for 60 seconds
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Leakage Current
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<5 mA
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Warranty
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1 year (air-cooled models)
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Key Features
- Compact & Lightweight: Shared winding design reduces material usage and physical size.
- High Efficiency: Lower copper and core losses due to reduced winding volume.
- Cost-Effective: Economical for voltage conversion where isolation isn’t critical.
- Wide Voltage Range: Customizable input/output voltages as per customer requirements.
- Thermal Protection: Designed for continuous duty with Class ‘F’ or ‘H’ insulation.
- Low Impedance: Ensures minimal voltage drop under load.
Quality & Testing
- ISO 9001:2015 Certified manufacturing processes.
- High Dielectric Strength: Withstands 2.5 kV for 60 seconds.
- Insulation Resistance: >1000 MΩ (ensures safety and longevity).
- Leakage Current: <5 mA (meets international safety norms).
- Warranty: Up to 1 year standard warranty for air-cooled models.
Applications
- Industrial Machinery: Voltage matching for motors, CNC machines, and automation systems.
- Commercial Buildings: Lighting control, HVAC systems, and elevator drives.
- Laboratories & Testing Facilities: Precise voltage adjustment for equipment calibration.
- Audio & Broadcasting Equipment: Where ground loops must be avoided
- Renewable Energy Systems: Auxiliary voltage control in solar/wind power setups.
Three Phase Air-Cooled Servo Voltage Stabilizer
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Frequently Asked Questions
An auto transformer shares a common winding between input and output and does not provide electrical isolation. An isolation transformer has separate primary and secondary windings, offering galvanic isolation for safety and noise suppression.
Not recommended. Auto transformers do not block noise, spikes, or harmonics. For sensitive loads, use a K-rated isolation transformer instead.
Yes—typically more efficient than isolation transformers of the same rating due to lower losses and simpler construction.
Absolutely. Input/output voltages are customizable per customer requirement (e.g., 415V to 240V, 800V to 415V, etc.).
The document highlights outdoor-type isolation transformers, but auto transformers can be built with IP21 to IP54 enclosures upon request for dust/moisture protection.