KTAC TECHNOLOGY, as a professional automatic voltage regulator manufacturer and supplier in China with over 20 years of manufacturing experience since 2004, provides full-series AVR solutions for global residential, commercial, and industrial applications. Our automatic voltage regulator lineup covers relay type, servo motor type, and SCR static type, available in single-phase and three-phase configurations with power ratings from 500VA to 1000KVA.
All models adopt advanced MCU/DSP control, high-efficiency toroidal transformers, and comprehensive protection mechanisms, balancing safety, precision, and reliability. Strictly certified and fully compatible with generators and sensitive equipment, our AVR systems serve as reliable, cost-effective voltage stabilization equipment for modern homes, factories, and critical infrastructure.
An automatic voltage regulator (AVR) is an electrical device that automatically maintains a constant output voltage despite fluctuations in the incoming utility power. It protects connected appliances from damage caused by over-voltage, under-voltage, surges, and brownouts. Whether you are safeguarding a refrigerator in a home with unstable grid power, protecting a production line in a factory, or ensuring stable power for medical equipment in a hospital, an AVR is essential for reliable operation and long equipment life.
Precision-Engineered for Diverse Applications: From compact wall-mount models for home appliances to heavy-duty cabinet systems for industrial machinery, our AVR series is designed for voltage stabilization in homes, offices, factories, data centers, and medical facilities. Relay type units feature compact tower or wall-mount designs; servo motor and SCR static models are housed in robust cabinets with intelligent cooling.
Advanced Control Technology: Relay type AVR uses MCU-controlled circuits with zero-cross switching for fast response and ±8% regulation. Servo motor AVR employs carbon brush regulation for ±1-3% precision, ideal for sensitive equipment. SCR static AVR utilizes DSP control and solid-state switching for 10-40ms response, ±1% precision, and no moving parts.
Safe and Reliable Protection: All models include comprehensive protection: over-voltage, under-voltage, overload, short circuit, and over-temperature protection. Select models feature phase-loss protection, bypass function, and programmable settings for over-voltage, under-voltage, over-current, and regulation precision. Dielectric strength up to AC 2500V/1min ensures safety.
Ultra-Long Service Life: With proper maintenance, relay type AVR lasts 5-10 years, servo motor AVR lasts 10-15 years (with brush replacement), and SCR static AVR offers 15-20 years due to no moving parts. Stable long-term performance significantly reduces replacement and maintenance costs.
Smart Compatibility & Communication: Select models feature digital LED/LCD displays showing real-time voltage, current, and power. Optional RS232/RS485 communication and SNMP adapters enable remote monitoring and integration with building management systems. Wide input voltage ranges (100-270VAC, 260-456VAC, 380V±20%) accommodate global grids.
Relay Type AVR (500VA–20KVA): Includes VR-U, AVS, AVS-PLUS, AVS-PRO, AVR-G, AVR-F, AVR-WG, and AVS-P series. Featuring 5-7 taps, toroidal autotransformer, and ±8% regulation. Ideal for home appliances, freezers, refrigerators, air conditioners, and whole-house voltage management. Wall-mount and tower options available.
Servo Motor AVR (10KVA–50KVA single-phase, 10KVA–150KVA three-phase): SVC series single-phase and SBW series three-phase. Featuring carbon brush regulation, ±1-3% precision, and separate phase regulation for three-phase balance. Ideal for elevators, air conditioners, heaters, production lines, automation equipment, laser equipment, industrial robots, and medical equipment.
SCR Static AVR (30KVA–1000KVA three-phase): SBWZ series. Featuring DSP control, SCR switch technology, ±1% precision, 10-40ms response, ≥99% efficiency, and no waveform distortion. Ideal for large data centers, semiconductor manufacturing, telecommunications, and heavy industrial applications requiring zero maintenance and maximum reliability.
Home Appliance Protection: Stabilize voltage for refrigerators, freezers, air conditioners, washing machines, and televisions. Relay type AVR with delay protection (6s/180s) prevents compressor damage from rapid power cycling.
Industrial Manufacturing: Protect production lines, CNC machines, industrial robots, laser equipment, and automation systems from voltage fluctuations that cause defects or downtime. Servo motor and SCR static AVR provide the precision and reliability required.
Medical Facilities: Ensure MRI, CT, X-ray, and life-support equipment receive stable power. SCR static AVR with ±1% precision and zero transfer time is ideal for critical medical applications.
Commercial Buildings: Safeguard elevators, HVAC systems, lighting, and security systems. Three-phase servo motor and SCR static AVR handle unbalanced loads and provide reliable voltage stabilization.
Telecommunications and Data Centers: Protect base stations, switching systems, and servers from power anomalies. SCR static AVR with high efficiency and no moving parts ensures continuous operation.
With over 20 years of continuous power supply manufacturing experience (since 2004), KTAC has built a reputation for quality, reliability, and innovation. Our manufacturing foundation includes:
3 factories with over 8,000 m² of production floor
100+ professional staff including dedicated QA and after-sales engineers
Export to 30+ countries across Asia, Africa, Europe, and the Americas
Trusted clients including Tier-1 distributors and reputable companies worldwide
We support OEM/ODM services including custom enclosure color, logo printing, packaging design, and parameter customization. Every automatic voltage regulator we manufacture is built to deliver years of dependable service.
A: Relay type AVR uses relays to switch transformer taps, offering ±8% precision and fast response at low cost—ideal for home appliances. Servo motor AVR uses a motor-driven carbon brush for stepless regulation with ±1-3% precision—ideal for sensitive equipment. SCR static AVR uses solid-state switching with ±1% precision, 10-40ms response, and no moving parts—ideal for critical industrial applications.
A: Calculate the total power of all connected devices and add a 20-30% safety margin. For home appliances, choose 500VA–5KVA. For small offices and workshops, choose 5–20KVA. For industrial machinery, choose 30–150KVA. For large facilities, choose 200–1000KVA.
A: Yes. Our AVRs are compatible with generators as long as the generator output is within the AVR's input voltage range and frequency. Wide input ranges and automatic frequency sensing ensure reliable operation.
A: Relay type AVR lasts 5-10 years; servo motor AVR lasts 10-15 years (with periodic brush replacement); SCR static AVR lasts 15-20 years due to no moving parts. Proper installation and maintenance extend service life.
