VARIAC Variable Transformer
Adjustable VARIAC Variable Transformer for Laboratory Testing, Equipment Commissioning and Voltage Adjustment
Rated Power: 0.5~100KVA
Input Voltage: 110V / 220V / 380V / 400V (Customized)
Output Voltage: 0-250V / 0-450V Adjustable
Frequency: 50/60Hz
Phase: Single Phase / Three Phase
Output Adjustment: Continuous Variable Voltage Control
Waveform: Low Distortion Sine Wave Output
Application: Laboratory Testing & Industrial Equipment
Customization: Voltage, Capacity and Configuration Available
Product Introduction
The single-phase and three-phase VARIAC variable transformer series adopts an adjustable autotransformer structure, consisting of a toroidal regulating transformer (voltage regulating coil) and a carbon brush assembly. The toroidal coil is mounted on the iron core, and the carbon brush maintains continuous contact with the coil surface through spring pressure. When the main shaft is turned, the carbon brush moves along the surface of the voltage regulating coil, thereby changing the effective turns ratio between the primary and secondary windings and adjusting the output voltage continuously within a range of 0-450V.
The three-phase VARIAC uses three single-phase regulating units with a common neutral connection for voltage adjustment.
Product functions and features
The VARIAC variable transformer provides continuously adjustable AC voltage output with smooth and stepless regulation. It is widely used as an adjustable test power supply for industrial equipment, laboratories, research facilities and electrical testing applications. The output waveform maintains low distortion characteristics and meets the requirements of electrical testing power supplies. The output voltage can be continuously adjusted from 0 to 450V, with customized voltage ranges available according to application requirements. The unit supports adjustment under full-load conditions and features reliable operation, easy maintenance and strong overload capability. It is suitable for applications including voltage adjustment, power testing, lighting control and motor speed regulation. For applications requiring remote or automatic adjustment, the VARIAC variable transformer can be equipped with a motor-driven adjustment mechanism, allowing voltage adjustment through push buttons or external control systems.
VARIAC Variable Transformer Working Principle
Understanding the VARIAC variable transformer voltage adjustment principle and current-limiting reactor design.
01 Variable Voltage Adjustment Principle
A VARIAC variable transformer uses an adjustable autotransformer structure with a movable carbon brush. By changing the contact position on the regulating coil, the effective turns ratio is adjusted to achieve continuous variable AC voltage output.
- Adjustable autotransformer structure
- Carbon brush contact adjustment
- Continuous variable voltage output
- Single-phase and three-phase configurations
02 Current-Limiting Reactor Design
High-current VARIAC variable transformers incorporate a current-limiting reactor structure to improve operating stability under high-current operating conditions. The reactor helps control current variation and reduces electrical stress during voltage adjustment.
- Current-limiting reactor configuration
- High-current operating capability
- Improved electrical stability
- Suitable for industrial testing applications
VARIAC Variable Transformer Technical Specifications
Electrical Specifications
| Product Model | TDGC2 / TSGC2 Series VARIAC Variable Transformer |
| Rated Capacity | 0.5KVA~100KVA |
| Input Voltage | Single Phase: 110V/220V Three Phase: 380V/400V |
| Output Voltage | 0-450V Adjustable |
| Rated Frequency | 50/60Hz |
| Rated Phase | Single Phase / Three Phase |
| Adjustment Type | Continuous Variable Voltage Adjustment |
| Adjustment Method | Manual Adjustment / Motorized Adjustment |
| Transformer Type | Adjustable Autotransformer |
| Winding Material | Copper Wire |
| Cooling Method | Natural Air Cooling / Forced Air Cooling |
| Output Waveform | Low Distortion Sine Wave Output |
Performance & Protection
| Insulation Class | H / F / B |
| Insulation Level | Power Frequency Withstand Voltage 3KV |
| Overload Capacity | 1.5 Times Rated Current for 1 Minute |
| Display Function | Input and Output Voltage / Current Display, Temperature Display |
| Short Circuit Impedance | <3.5% |
| Protection Level | IP20 Indoor (Customized IP33 Outdoor) |
|
Applicable Standard |
IEC 61558-2-14 |
| Noise Level | ≤55dB |
| Operating Temperature | -25℃~+55℃ |
| Relative Humidity | 10%~90% RH |
| Altitude | ≤3000m |
Mechanical & Customization
| Installation Location | Indoor |
| Color | RAL7035 (Other Colors Available) |
| Dimensions | Customized According to Model |
| Customization | Voltage, Capacity and Configuration Available |
| Application | Laboratory Testing, Industrial Equipment, Electrical Testing |
VARIAC Toroidal Coil Manufacturing
Automatic Toroidal Coil Winding Process
The toroidal regulating coil is manufactured through an automatic winding process to ensure uniform winding density and stable electrical performance.
Toroidal Coil Finishing Process
After winding, the toroidal regulating coil undergoes surface finishing to ensure smooth carbon brush contact and reliable voltage adjustment performance.
VARIAC Variable Transformer Models & Selection Guide
Single Phase VARIAC Variable Transformer (TDGC2 Series)
| Model | Rated Power (KVA) | Rated Current (A) |
| TDGC2-0.2 | 0.2 | 0.8 |
| TDGC2-0.5 | 0.5 | 2 |
| TDGC2-1 | 1 | 4 |
| TDGC2-2 | 2 | 8 |
| TDGC2-3 | 3 | 12 |
| TDGC2-5 | 5 | 20 |
| TDGC2-7 | 7 | 28 |
| TDGC2-10 | 10 | 40 |
| TDGC2-15 | 15 | 60 |
| TDGC2-20 | 20 | 80 |
| TDGC2-30 | 30 | 120 |
| TDGC2-40 | 40 | 160 |
| TDGC2-50 | 50 | 200 |
| TDGC2-60 | 60 | 240 |
Three Phase VARIAC Variable Transformer (TSGC2 Series)
| Model | Rated Power (KVA) | Rated Current (A) |
| TSGC2-1.5 | 1.5 | 2 |
| TSGC2-3 | 3 | 4 |
| TSGC2-6 | 6 | 8 |
| TSGC2-9 | 9 | 12 |
| TSGC2-12 | 12 | 16 |
| TSGC2-15 | 15 | 20 |
| TSGC2-20 | 20 | 27 |
| TSGC2-30 | 30 | 40 |
| TSGC2-40 | 40 | 54 |
| TSGC2-50 | 50 | 67 |
| TSGC2-60 | 60 | 80 |
| TSGC2-80 | 80 | 107 |
| TSGC2-100 | 100 | 134 |
VARIAC Variable Transformer Applications
Laboratory Testing & Electrical Experiments
VARIAC variable transformers are widely used in schools, electrical laboratories and industrial test facilities as adjustable AC power sources. They allow engineers to simulate different voltage conditions for equipment testing and evaluation.
Industrial Heating Control
Used for electric heating equipment including annealing furnaces, drying furnaces, sintering furnaces and tunnel furnaces. Adjustable output voltage allows precise control of heating power and temperature.
Industrial Equipment & Motor Control
Applied in packaging machinery, injection molding machines, extrusion equipment and other industrial systems where adjustable voltage output is required for AC motor speed control and equipment commissioning.
Electrical Equipment Testing & Aging Test
Provides adjustable high and low voltage simulation for electrical equipment aging tests, reliability evaluation and controller development.
Glass Manufacturing Industry
Used in glass fiber production, glass forming, glass melting and float glass production lines for adjustable heating power control.
Chemical & Process Industry
Applied in distillation, evaporation, preheating systems, pipeline heating and petrochemical processes requiring adjustable electrical heating control.
Specialized Industrial Applications
Suitable for induction heating equipment, heat treatment systems, diamond press heating, aviation power supply adjustment and other industrial voltage adjustment applications.
Quality & Compliance
Certified quality management and product compliance for industrial power equipment.
Factory Tour & Manufacturing Capability
Manufacturing processes, production equipment and quality control facilities at Winzele.
International Customer Visits & Technical Exchange
International customers visit Winzele manufacturing facilities for equipment inspection, technical discussion and project communication.
Frequently Asked Questions About VARIAC Variable Transformer
Q1: What is a VARIAC variable transformer?+
A VARIAC variable transformer is an adjustable autotransformer that provides continuously variable AC voltage output by changing the contact position of a carbon brush on the regulating winding. It is widely used for electrical testing, voltage simulation and industrial control applications.
Q2: What is the difference between a VARIAC and a voltage stabilizer?+
A VARIAC provides manually or continuously adjustable output voltage for testing, simulation and control purposes. A voltage stabilizer automatically maintains a stable output voltage to compensate for unstable input power conditions.
Q3: Can a VARIAC adjust voltage under load conditions?+
Yes. Industrial VARIAC variable transformers can provide smooth voltage adjustment under rated load conditions. The actual adjustment capability depends on the model capacity and application requirements.
Q4: What is the difference between single phase and three phase VARIAC?+
Single phase VARIAC models are typically used for laboratory equipment and smaller electrical applications. Three phase VARIAC models are designed for higher power applications requiring adjustable three phase AC voltage output.
Q5: What voltage range can a VARIAC variable transformer provide?+
Winzele VARIAC variable transformers can provide adjustable output voltage ranges including 0-250V and 0-450V according to model configuration.
Q6: What standard does the VARIAC variable transformer comply with?+
The VARIAC variable transformer is designed according to applicable safety requirements including IEC 61558-2-14 for variable transformers.
Q7: Can the VARIAC variable transformer be motorized?+
Yes. Winzele VARIAC variable transformers can be equipped with motor-driven adjustment systems. The output voltage can be adjusted through push buttons, control panels or external control signals for automatic testing and industrial applications.
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