Qoltec Three-Phase AVR Voltage Stabilizer 30kVA Servomotor LCD Expert Line

For industrial environments where voltage fluctuations threaten uptime, the Qoltec 51909 three-phase AVR stabilizer delivers 30kVA of servo-controlled correction with ±3% output accuracy. Unlike relay-switching units that step voltage in coarse increments, this Expert Line model uses a servomotor-driven variable transformer for continuous, smooth regulation—protecting sensitive machinery from sags, surges, and phase anomalies without interrupting the load.

Highlights

• Three-phase 30kVA capacity for heavy industrial loads
• Servomotor technology ensures precise, stepless voltage correction
• Wide input range: 280V–430V AC (phase-to-phase)
• LCD display for real-time status and diagnostics
• Comprehensive protection: overload, over/undervoltage, short circuit, overheating, phase loss, and phase sequence error
• High efficiency ≥98% with no additional harmonic distortion
• Floor-standing design with IP20 rating for controlled indoor environments

In daily use

Connect the stabilizer between your mains supply and critical three-phase equipment such as CNC machines, medical imaging systems, or data center cooling. The servomotor responds to input changes in under 1.5 seconds, keeping output at 380V ±3% even during brownouts or overvoltage events. The LCD panel shows input/output voltage, load level, and fault codes, enabling quick troubleshooting. Built-in phase sequence monitoring prevents motor reversal damage, while thermal and short-circuit protections automatically disconnect the load under fault conditions. With air cooling and Class F insulation, the unit operates reliably from -10°C to +40°C.

Full specifications

• Type: Three-phase AVR voltage stabilizer
• Technology: Servomotor
• Power capacity: 30 kVA
• Input voltage range: 280V–430V AC (phase-to-phase)
• Output voltage: 380V AC (phase-to-phase)
• Output voltage accuracy: ±3%
• Frequency: 50/60 Hz
• Phase: Three-phase (3F)
• Display: LCD
• Protection features: Overload, overvoltage, undervoltage, short circuit, overheating, phase loss, phase sequence error
• Efficiency: ≥98%
• Response time: <1.5s for ±10% input change
• Operating temperature: -10°C to +40°C
• Cooling system: Air cooling
• Insulation class: F
• Dielectric strength: 2000V / 1 min
• Harmonic distortion: No additional harmonic distortion
• IP rating: IP20
• Mounting type: Floor standing

Final note

Built for continuous industrial duty, the Qoltec 51909 combines servomotor precision with robust protection—ensuring your three-phase equipment runs smoothly even on unstable grids.