SBW-150kVA Industrial 3-Phase AVR Stabilizer | ±2–5% Accuracy, 90%+ Efficiency, CE/ISO Certified

3 Phase Voltage Stabilizer SBW-150kVA | Automatic Servo Voltage Regulator 380V with Pure Copper Coils

The PQUAN SBW-150kVA 3 Phase Voltage Stabilizer is a high-capacity, fully automatic compensated voltage regulator designed to deliver stable 380V three-phase output in environments where the mains supply suffers from frequent fluctuations, sags, surges, or imbalance. Engineered with a servo-motor-driven carbon brush mechanism and pure copper winding columns, this automatic voltage regulator (AVR) continuously monitors input voltage and adjusts the output in real time, ensuring sensitive industrial equipment receives clean, consistent power regardless of grid instability.

The SBW series utilizes Static Var Compensation (SVC) technology combined with an autotransformer and compensation transformer topology. Unlike relay-type voltage stabilizers that produce stepped, jerky adjustments, the servo-driven SBW regulator provides smooth, continuous voltage correction with no waveform distortion. With a wide input range of 304V–456V (customizable on request) and a precise output accuracy of ±2%–5% adjustable, the SBW-150kVA voltage stabilizer is ideal for factories, production lines, medical facilities, telecom stations, and commercial buildings where reliable power quality is critical.

Housed in a robust floor-standing steel cabinet with an integrated control panel featuring analog voltmeters, indicator lights, and mode selector switches, the unit offers both automatic and manual operation modes. A convenient mains bypass switch allows direct grid supply during maintenance or servicing without interrupting power to the load.

Key Performance Advantages

Pure Copper Winding for Superior Conductivity

At the heart of the SBW regulator are pure copper column windings — the core component responsible for voltage transformation and compensation. Copper offers lower resistivity and higher electrical conductivity than aluminum, resulting in reduced heat generation, higher efficiency (≥90% for models above 50kVA), and a significantly longer service life. The high-grade copper coils ensure the stabilizer can handle continuous full-load operation and withstand instantaneous overloads without performance degradation.

Fast & Smooth Servo-Motor Regulation

The servo motor voltage stabilizer employs a precision servo motor that drives a carbon brush along the autotransformer winding to adjust the output voltage continuously. When the input voltage deviates by 10%, the system responds within ≤1.5 seconds, correcting the output back to the setpoint. This stepless, smooth regulation eliminates the voltage spikes and gaps common with relay-type stabilizers, making it safe for sensitive electronics, PLCs, CNC machines, and medical imaging equipment.

Wide Input Range & High Precision Output

With a standard input range of 304V–456V (three-phase) and customizable wider ranges available, the SBW-150kVA handles severe under-voltage and over-voltage conditions typical in rural areas, developing regions, and weak-grid industrial zones. Output voltage is stabilized at 380V ±2%–5% (adjustable), meeting the tolerance requirements of most industrial machinery. The unit supports both 50Hz and 60Hz frequency standards, making it suitable for global deployment.

Comprehensive Protection & Safety Features

The industrial voltage stabilizer is equipped with multiple layers of protection: overvoltage protection, overcurrent protection, phase loss protection, and phase sequence protection (standard on models 150kVA and above). In the event of a mechanical fault or abnormal condition, the unit triggers automatic protection to prevent damage to both the regulator and connected loads. The mains bypass function allows seamless switching to direct grid supply for emergency use or scheduled maintenance.

Continuous Unattended Operation

Once installed and configured, the SBW regulator operates fully automatically with no ongoing operator intervention required. It can start automatically on power-up or be set to manual start, and it runs continuously for extended periods without overheating thanks to efficient natural convection cooling and strategically placed ventilation. The front-panel analog meters display input and output voltages for each phase, allowing at-a-glance monitoring without digital displays that can fail in harsh environments.