ATA QB-H series medium-voltage soft starters are designed for the start, operation, stop control and protection of medium-voltage AC motors, serving as an ideal replacement for traditional direct-on-line, star-delta and autotransformer starters. They adopt computer control and power electronics technology, with medium-voltage high-power thyristors as main circuit components. By adjusting the thyristor conduction angle, they realize smooth voltage regulation and contactless motor start-stop. Starting the motor with optimal current, they reduce grid impact, vibration, noise and mechanical stress, and prolong equipment service life. Ideal for heavy-duty applications such as pumps, fans, compressors and crushers in mining, power, oil & gas and steel industries, they deliver robust performance with comprehensive protection features for demanding industrial environments.
Medium-voltage thyristors serve as the main circuit components, equipped with voltage
sharing protection and over-voltage protection systems.
Advanced optical fiber or magnetic ring transmission technology isolates the trigger
detection of medium-voltage thyristors from the low-voltage control circuit.
The advanced digital signal processor (DSP) executes core control, while the microcontroller manages data and communication—ensuring real-time, efficient device control, intuitive display, high reliability and good stability.
Multi-level signal processing and isolation technology gives the system strong anti-interference capability.
Chinese/English display, membrane keys, simple operation and user-friendly interface.
Equipped with RS-485 or Profibus communication interfaces, enabling communication
with upper computers or central control centers.
Ramp Voltage Control, Current Limiting Control, Ramp Current Control, Soft Stop Control.
Local Button Starting, Keyboard Key Starting, Upper Computer Remote Starting, Combination Starting.
- Phase Loss & Undervoltage Protection
- Power Supply Overvoltage Protection
- Running Overcurrent Protection
- Thyristor Module Protection
- Instantaneous Overvoltage Protection
- Start Interval Time Protection
- Start Timeout Protection
- Interlock Control Protection
- Three-Phase Unbalance Protection
- Phase Sequence Protection
| Voltage range | 2kV-15kV |
|---|---|
| Current range | 120A-3150A |
| Typical power range | 110kW-50000kW |
| Starting current limit | 150%-800% of rated current, adjustable |
| Starting modes | Voltage start / Ramp start / Current-limit start |
| Stop modes | Free stop / Soft stop |
| Protection functions | Phase Loss & Under-voltage, Power Supply Over-voltage, Running Over-current, Thyristor Module .Instantaneous Over-voltage, Start Interval Time, Start Timeout. Interlock Control, Three-Phase Unbalance, Phase Sequen |
| Communication interfaces | RS-485 and Profibus interfaces (optional) |
| Operating temperature | -20 to +50 degrees C |
| Altitude | Up to 1500m,(Derating is required for altitude >1500m) |
| Enclosure protection class | IP20 - IP54 (According to customer’s request) |
| Certifications for this specific model | CE / EAC |
| Equipment types this model is suitable for | Pumps / Fans / Compressors / Crushers / Mixers / Belt conveyors / Ball mills / Blowers |
|---|---|
| Industries and specific use case for each | - Steel and Metal — starting large rolling mill drive motors - Mining — compressor starts in underground environments - Petrochemical — pump starts on refinery sites |
Three-phase squirrel-cage induction motors, synchronous motors, wound-rotor motors.
Soft start time 0~120s, soft stop time 0~60s, initial voltage 20~80%, kick start time 0~3s.
Natural cooling; indoor standard, outdoor with rain shelter; ambient -20°C~+50°C, altitude ≤1500m.
Yes. RS-485/Profibus interfaces, Modbus RTU/Profibus-DP protocols, local/key/remote/combined start modes.
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