KTAC TECHNOLOGY, with over 20 years of Automatic Voltage Regulator manufacturing experience , presents the SBWZ Series：a premium lineup of three-phase SCR control static automatic voltage regulators. Covering power ratings from 30KVA to 1000KVA, the SCR Static AVR is engineered for mission-critical applications where voltage stability, response speed, and reliability are non-negotiable.
An SCR control static automatic voltage regulator, also known as a static voltage stabilizer or contactless voltage regulator, is a fully electronic voltage regulation system that uses Silicon Controlled Rectifiers (SCRs) instead of traditional servo motors or mechanical relays to maintain a stable output voltage. Unlike servo motor AVRs that rely on carbon brushes moving along a transformer, or relay type AVRs that switch between fixed transformer taps, SCR static AVRs employ solid-state electronic switching to adjust voltage with millisecond-level response speeds and ultra-high precision.
Understanding the differences between the three main AVR technologies is essential for selecting the right solution:
| Feature | Relay Type AVR | Servo Motor AVR | SCR Static AVR |
| Regulation Method | Relays switch transformer taps | Servo motor moves carbon brush | SCRs electronically adjust voltage |
| Voltage Precision | ±5% to ±8% | ±1% to ±3% | ±1% (phase voltage) |
| Response Speed | <50ms | 500ms-1000ms | 10ms-40ms |
| Moving Parts | Relay contacts | Carbon brush, servo motor | None——fully static |
| Maintenance | Relay replacement | Brush replacement | Virtually none |
| Waveform Distortion Minimal | <0.1% | <0.1% | no harmonic increment |
| Efficiency | Moderate | 96-98% | ≥99% |
The SCR static AVR stands apart as the premium choice for applications demanding the highest precision, fastest response, and maximum reliability.
The SBWZ Series delivers exceptional voltage regulation accuracy: phase voltage precision of ±1% and line voltage precision of ±1.5%. This level of precision is essential for powering sensitive equipment such as medical imaging devices, CNC machines, semiconductor manufacturing tools, and laboratory instruments, where even minor voltage deviations can cause malfunctions, production defects, or inaccurate test results.
With a response speed of 10ms to 40ms, the SBWZ Series can correct voltage fluctuations almost instantaneously. This rapid response is critical for protecting equipment against sudden voltage sags, surges, and transients that could otherwise cause system crashes, data corruption, or hardware damage. For context, a servo motor AVR typically requires 500ms to 1000ms to respond, making the SBWZ Series up to 100 times faster.
Unlike servo motor AVRs that rely on carbon brushes and mechanical components that wear out over time, the SBWZ Series employs a fully static, contactless structure with no moving parts. This eliminates common failure points such as brush wear, sparking, and mechanical fatigue. The result is a voltage regulator that requires virtually no maintenance and delivers consistent performance over an extended service life.
The SBWZ Series SCR Static AVR achieves an outstanding efficiency rating of ≥99%. This means less than 1% of input power is lost as heat, significantly reducing energy costs compared to less efficient regulation methods. Over the lifetime of the equipment, this efficiency advantage translates into substantial operational savings, especially for continuous-duty applications.
The SBWZ Series features independent regulation of each phase. Unlike AVRs that regulate all three phases together, the SBWZ monitors and adjusts each phase separately, automatically balancing three-phase output even when single-phase loads are unevenly distributed. This is critical for industrial applications where phase imbalance can cause motor overheating, reduced efficiency, and premature equipment failure.
The SBWZ Series introduces no incremental harmonics and produces <0.1% output waveform distortion. The output remains a pure sine wave, making these regulators ideal for powering sensitive electronic equipment, audio-visual systems, and precision instruments where power quality is paramount.
The SBWZ Series incorporates a full suite of protection features: overload protection, over-voltage protection, under-voltage protection, short-circuit protection, over-temperature protection, and phase-loss protection. A built-in bypass function allows the load to be switched directly to mains power during maintenance or in the event of a regulator fault, ensuring continuous operation of critical equipment.
The SBWZ Series features a digital LED display showing real-time phase voltage, phase current, and power. Users can program settings for over-voltage, under-voltage, over-current, and regulation precision thresholds, providing flexible configuration to match specific application requirements.
The SBWZ Series is built to handle demanding industrial environments. With dielectric strength of AC 2500V/1min and robust construction, these units deliver reliable performance even under continuous heavy loads and harsh conditions.
Medical Facilities: Protect MRI scanners, CT machines, X-ray equipment, and life-support systems that require ultra-stable power for accurate diagnostics and patient safety.
Industrial Manufacturing: Safeguard CNC machining centers, robotics, automation equipment, and production lines from voltage fluctuations that cause defects or downtime.
Data Centers and Server Rooms: Prevent system crashes and data corruption caused by voltage sags or transients.
Semiconductor and Electronics Manufacturing: Protect sensitive fabrication equipment from power anomalies.
Commercial Buildings: Stabilize voltage for elevators, HVAC systems, and critical lighting.
R&D Laboratories: Provide clean, stable power for precision instruments and test equipment.
KTAC delivers quality and reliability through 3 factories with 8,000+ m² production floor, 100+ professional staff, and exports to 30+ countries. The SBWZ Series is backed by comprehensive OEM/ODM services including custom enclosure color, logo printing, packaging design, and parameter customization.
A: SCR static AVRs offer millisecond-level response (10-40ms vs 500-1000ms), no moving parts (eliminating brush wear and maintenance), higher efficiency (≥99% vs 96-98%), and no waveform distortion. They are the premium choice for critical applications.
A: Yes. The SBWZ Series features separate regulation of each phase, automatically balancing three-phase output even when single-phase loads are unevenly distributed.
A: The SBWZ Series includes a built-in bypass function, allowing the load to be switched directly to mains power during maintenance or in the event of a fault——ensuring continuous operation.
A: Because it has no moving parts, an SCR static AVR offers significantly longer service life than servo motor or relay type AVRs——typically 15-20 years or more with minimal maintenance.
