AC Voltage Regulator
  • AC Voltage Regulator
  • AC Voltage Regulator
  • AC Voltage Regulator
  • AC Voltage Regulator

AC Voltage Regulator

Continuously adjustable contact voltage regulator for testing, laboratory, and industrial power applications

  • Rated capacity: 50–1000 kVA (other capacities can be customized upon request)
  • Phase number: single-phase or three-phase (optional)
  • Rated input voltage: 220 V / 380 V (other voltages can be customized upon request)
  • Rated output voltage: 0–250V / 0–420V / 0–650V (other voltages can be customized upon request)
  • Frequency: 50 Hz / 60 Hz
  • Efficiency: ≥ 96 %
  • Waveform distortion: ≤ 2 % (no additional waveform distortion)
  • Enclosure protection level: IP 20 as standard (higher protection levels are customizable upon request)
Request a Quote

AC voltage regulators (AVR) are dry-type contact regulators composed of a regulating mechanism and a series transformer. By adjusting the contact position between the carbon brush and the polished surface of the cylindrical winding, the number of turns between the primary and secondary windings changes, allowing continuous and smooth voltage control over long periods of operation. Continuously adjustable contact voltage regulators are commonly used in laboratories, test benches, and industrial environments where precise voltage adjustment and stable output are required.

Features
  • Each voltage regulator uses a servo motor control system to ensure steady, continuous voltage adjustment from 0 V to 430 V for single-phase models and up to 520 V or higher for three-phase units.
  • With an accuracy of ±1%, continuously adjustable contact voltage regulator keeps voltage stable even for highly sensitive equipment. Independent phase control allows them to handle unbalanced loads, which is ideal for laboratory systems, CT scanners, and other precision instruments.
  • Equipped with industrial-grade reliability, AC voltage regulators can handle short-term overloads up to twice their rated current for one minute, ideal for applications involving motor start-up or impact loads. These regulators operate stably in environments ranging from –5 °C to +40 °C.
  • They achieve over 96% efficiency thanks to a low-loss winding design that minimizes heat and the servo motor system maintains precise closed-loop control for stable, long-term operation.
  • Remote voltage feedback and RS485 communication interfaces allow integration into automation systems. Equipped with real-time voltage and current monitoring to simplify system management.
  • Features a dual carbon brush design that increases current-carrying capacity by more than 20% compared with conventional structures, improving overall efficiency and stability.
  • The AC voltage regulators' balanced winding and core structure help control waveform distortion to less than 2%, keeping the voltage steady and reliable even when there are varying loads.
  • Their enclosure can be customized according to user requirements and includes built-in zero-return protection, travel limit switches, and sequence controllers to prevent mechanical overrun and overvoltage damage.
Specifications
Product type AC Voltage Regulator
Model WLAB-DU-(#####kVA)
Rated capacity 50–1000kVA Other capacities can be customized upon request
Phase number Single-phase or three-phase (optional)
Frequency 50Hz/60Hz
Rated input voltage 220V/380V Other voltages can be customized upon request
Rated output voltage 0–250V/0–420V/0–650V Other voltages can be customized upon request
Efficiency ≥96%
Waveform distortion ≤2% (no additional waveform distortion)
Load rate 100%
Insulation class Class F (customizable upon request)
Voltage regulation method Push-button control
Protection functions Over-voltage, over-current, short-circuit, temperature, and phase-sequence, zero-position, upper/lower limit protection, and start-up interlocking function
Output display LCD or digital display (customizable upon request)
Cooling method Selectable
1. Natural air cooling (AN)
2. Forced air cooling (AF)
Operating environment Ambient temperature: -20℃ to +45℃
Storage temperature: -30℃ to +70℃
Relative humidity: 0–90% RH
Altitude: < 1000m
Installation site: free from vibration and shock, as well as gases, vapors, dust, chemical precipitates, or other explosive and corrosive media that may affect insulation performance
Enclosure protection level IP20 as standard (higher protection levels are customizable upon request)
Main Components
Servo Motor Servo Motor
Voltage Regulating Transformer Voltage Regulating Transformer
Compensation Transformer Compensation Transformer
Applications
  • Power SystemsPower Systems
    AC voltage regulators help stabilize voltage levels within power distribution networks, keeping the supply consistent across different sections of the grid.
  • Industrial ControlIndustrial Control
    Regulators support processes in textile dyeing, chemical fiber, and plastic molding lines by providing adjustable voltage and precise power control.
  • Electrical TestingElectrical Testing
    Used in labs and testing setups for high-voltage simulation, insulation testing, and performance verification of electrical components.
  • New EnergyNew Energy
    Used as a voltage regulation unit in photovoltaic inverter and energy storage systems to keep the output stable during grid or load fluctuations.
Related Power Quality Device
Servo Voltage Stabilizer
Servo Voltage Stabilizer
Static Voltage Stabilizer
Static Voltage Stabilizer
AC Voltage Regulator
AC Voltage Regulator
Voltage & Frequency Converter
Voltage & Frequency Converter
Laminated Busbare
Laminated Busbare
Static Var Generator (SVG), Low Voltage
Static Var Generator (SVG), Low Voltage
Active Harmonic Filter (AHF)
Active Harmonic Filter (AHF)
Reactive Power Compensation System
Reactive Power Compensation System
Static Var Generator (SVG), High Voltage
Static Var Generator (SVG), High Voltage
DC/DC Converter
DC/DC Converter

The main difference between an AC voltage stabilizer and an AC voltage regulator lies in their purpose. Voltage stabilizers keep the output voltage fixed within a narrow range, even when the input voltage fluctuates. For example, if the input varies by ±10% around 220 V, the stabilizer can maintain a steady output of about 220 V ±2%, ideal for equipment that requires precise and stable voltage, such as CNC machines or medical devices. A voltage regulator, on the other hand, gives more flexibility. The output voltage can be set anywhere between 0 V and 380 V, either manually or automatically, which is useful for testing or calibration work that requires variable power such as in laboratories, testing setups, or equipment calibration areas.