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Voltage Regulators
10 Series · 64 Models
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Voltage Regulators Overview
Automatic voltage regulators (stabilizers) keep output voltage within a tight tolerance despite fluctuating mains, using servo-motor correction and smart control circuits. QDTB offers single-phase (TND, JJW, SJJW) and three-phase (SBW, SVC, WJS) models from 0.5 kVA to hundreds of kVA, with +/-3% accuracy, sub-1-second response, and over 90% efficiency. Built-in over-voltage, over-current, and over-temperature protection suits office equipment, medical devices, industrial automation, and commercial power systems.
Available Series
TND Series
The TND series single-phase automatic voltage regulators use servo motor-driven variable transformer technology for precise voltage regulation in office, laboratory, and household applications.
SVC Series
The SVC series three-phase high-precision voltage regulators provide stable 380V/220V output from a fluctuating three-phase input, with fast response and low waveform distortion for precision equipment and CNC machines.
SBW Series
The SBW series three-phase automatic voltage regulators are high-capacity compensator type stabilizers for industrial three-phase power systems with wide input voltage range.
WJS Series
The WJS series contactless (thyristor/IGBT) voltage stabilizers regulate three-phase voltage without moving parts or carbon brushes, using solid-state semiconductor compensation for ultra-precise, wear-free regulation.
JJW Series
The JJW series single-phase purified power supplies combine voltage regulation with power line conditioning, providing clean and stable power for sensitive equipment.
SJJW Series
SJJW three-phase precision voltage regulators maintain 380 V ±1% output. 6-100 kVA, 280-430 V input, for precision industrial equipment.
DBW Voltage Stabilizers Series
DBW series single-phase compensating voltage stabilizers maintain a stable 220V output from a fluctuating 160–250V input, using a compensating transformer with servo-driven brush adjustment. Rated 5–100 kVA, they combine high accuracy (±3%) with strong overload capacity, making them suitable for larger single-phase equipment, laboratories, and residential or commercial power distribution.
TNS Three Phase Stabilizers Series
TNS series three-phase high-precision servo voltage stabilizers regulate a fluctuating 280–430V three-phase input to a stable 380V ±3% output, using servo-driven variable transformer technology. Rated 6–100 kVA for industrial machinery, CNC equipment, and three-phase installations requiring accurate voltage with fast correction.
Induction Voltage Regulators Series
Induction voltage regulators provide stepless, brushless voltage regulation by varying the relative position of stator and rotor windings, offering smooth control for large-capacity AC circuits. Rated 10–1000 kVA for 380V/6kV/10kV systems, used where continuous, wear-free voltage adjustment is required.
Oil-Immersed Voltage Stabilizers Series
Oil-immersed voltage stabilizers provide outdoor voltage regulation for distribution and industrial circuits, with oil-immersed cooling and corrosion-resistant construction for pole-mount or pad-mount outdoor installation. Rated 10–1000 kVA for 6/10/35 kV and 380V systems, maintaining stable output under fluctuating supply.
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Application Scenarios
Medical Devices
Stabilises supply for imaging and laboratory equipment sensitive to voltage fluctuation.
Office & IT Equipment
Protects computers, servers and peripherals from brownouts and surges.
Industrial Automation
Keeps CNC, PLC and robotics within tolerance in areas with unstable grids.
Telecommunications
Reliable voltage for base stations and transmission equipment.
Laboratories & Testing
Precise supply for instruments where measurement accuracy depends on voltage.
Residential & Commercial
Whole-building stabilisation in regions with frequent voltage swings.
Technical Advantages
High Accuracy
±3% regulation keeps output within equipment tolerance.
Fast Response
Correction in under 1 second, recovering from grid disturbances quickly.
Full Protection
Built-in over-voltage, over-current and over-temperature protection.
Servo Technology
Motor-driven autotransformer design for reliable, low-maintenance operation.
FAQ - Voltage Regulators
What is the difference between a voltage regulator and a UPS?
Is ±3% accuracy sufficient?
Should I choose single-phase or three-phase?
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