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Continuously Variable Voltage Auto Transformer

Precision voltage control for laboratories, industrial applications, and testing facilities

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VoltApex Variable Voltage Auto Transformer
Fig 1. VoltApex VVT-300 Series Variable Auto Transformer

Precision Voltage Control Solution

The VoltApex Continuously Variable Voltage Auto Transformer is engineered to deliver precise voltage regulation for the most demanding electrical applications. Our industrial-grade transformer provides smooth, stepless voltage adjustment from 0-300V AC with exceptional accuracy and reliability.

Industry-Leading Performance

With 97%+ efficiency and military-grade construction, our VVT-300 series outperforms competitors in precision, durability, and operational lifespan. Certified for use in critical applications where voltage stability is paramount.

Precision Control

±0.5% voltage regulation accuracy

Robust Construction

Industrial-grade components

Advanced Features & Benefits

Engineered for precision and reliability in demanding environments

Precise Voltage Adjustment

Stepless 0-300V AC output with precision rotary control knob allows for exact voltage selection. Digital display option available for critical applications.

  • Resolution: 1V increments
  • Repeatability: ±0.2%
  • Linearity: ±0.5%

High Efficiency Design

97%+ energy efficiency achieved through precision-wound copper windings and advanced core materials reduces power loss and operating costs.

  • Low no-load losses
  • Minimal heat generation
  • Reduced energy costs

Comprehensive Protection

Multiple built-in safeguards protect both the transformer and connected equipment from electrical faults and abnormal conditions.

  • Overload protection
  • Short circuit protection
  • Thermal cutoff
  • Isolated output

Fast Response

Instantaneous voltage correction with response time <20ms ensures protection against sudden line fluctuations and transients.

  • No delay in regulation
  • Continuous monitoring
  • Instant correction

Durable Construction

Industrial-grade components housed in powder-coated steel enclosure with IP42 protection rating for reliable operation in harsh environments.

  • Heavy-duty carbon brushes
  • Military-grade contacts
  • Vibration-resistant

Expert Support

Comprehensive support package including installation guidance, maintenance training, and 24/7 technical assistance.

  • Dedicated support team
  • On-site training available
  • Extended warranty options

Technical Specifications

Detailed performance parameters and physical characteristics

Electrical Specifications

Input Voltage 230V AC ±10%, 50/60Hz (Custom ranges available)
Output Voltage 0-300V AC continuously variable (Higher ranges optional)
Power Rating
  • 1kVA (VVT-301)
  • 2kVA (VVT-302)
  • 3kVA (VVT-303)
  • 5kVA (VVT-305)
  • 10kVA (VVT-310)
Efficiency >97% at full load
Voltage Regulation ±0.5% of set voltage
Waveform Distortion <1% THD (Total Harmonic Distortion)
Response Time <20ms for voltage correction
Insulation Resistance >100MΩ at 500V DC
Dielectric Strength 2000V AC for 1 minute

Physical & Environmental Specifications

Enclosure Powder-coated steel cabinet (IP42 rated)
Dimensions (W×H×D)
  • 1kVA: 300 × 200 × 150 mm
  • 2kVA: 350 × 250 × 180 mm
  • 3kVA: 400 × 300 × 200 mm
  • 5kVA: 450 × 350 × 250 mm
  • 10kVA: 600 × 400 × 300 mm
Weight
  • 1kVA: 10 kg
  • 2kVA: 15 kg
  • 3kVA: 22 kg
  • 5kVA: 35 kg
  • 10kVA: 55 kg
Cooling Natural convection (Forced air cooling optional)
Operating Temperature 0°C to 45°C (Derating above 40°C)
Storage Temperature -20°C to 60°C
Relative Humidity Up to 90% non-condensing
Altitude Up to 2000m above sea level
Warranty 5 years comprehensive warranty

Standard Features

  • Precision-wound copper windings
  • Heavy-duty carbon brush assembly
  • Analog voltmeter (0-300V scale)
  • Rotary voltage adjustment knob
  • Input/output terminal blocks
  • Overload protection circuit
  • Thermal cutoff switch
  • Rubber feet for vibration damping
  • CE compliant design
  • RoHS compliant materials

Optional Features

  • Digital voltmeter with LCD display
  • Remote control interface (RS485/Modbus)
  • Forced air cooling system
  • Custom voltage ranges (0-500V available)
  • Higher IP ratings (IP54/IP65 enclosures)
  • Dual input voltage ranges
  • Output circuit breakers
  • Rack-mount versions
  • Custom colors and branding
  • Extended warranty packages

Technology Deep Dive

Advanced engineering for superior performance

Video: How Variable Auto Transformers Work

Innovative Design Features

The VoltApex VVT-300 series incorporates several patented technologies that set it apart from conventional variable transformers:

Advanced Core Design

Grain-oriented silicon steel core with interleaved laminations minimizes eddy current losses and reduces audible noise.

Precision Winding

Machine-wound copper coils with reinforced insulation provide optimal voltage distribution and thermal performance.

Enhanced Safety

Multiple protection systems including thermal fuses, overload relays, and insulated barriers ensure safe operation.

Variable transformer internal design

Fig 2. Internal Construction of VVT-300 Series

How It Works

The VoltApex variable auto transformer operates on the principle of electromagnetic induction with a single winding that serves as both primary and secondary:

  1. Input voltage is applied across the full winding
  2. A movable carbon brush contacts the winding at a variable point
  3. Output voltage is tapped from this contact point
  4. Rotating the control knob moves the brush smoothly along the winding
  5. This provides continuous voltage adjustment from 0V up to the input voltage
  6. Precision components ensure minimal waveform distortion

Industry Applications

Where precision voltage control matters most

Research Laboratories

Essential for physics and electronics labs requiring precise voltage control for experiments and equipment testing. Used in:

  • Electronics & Component Testing
  • Calibration & Quality Assurance
  • Educational & Technical Training
  • OEM & Production Line Testing

Get In Touch

Have questions or need a quote? Send us a message and we'll respond promptly.

Contact Information

Our Location

KHAS-615,HALDAUNI Greater Noida,Gautam Budh Nagar 201306

Call Us

+91 8882730630