Product Description
The RQ6000-400KW is an online high-power motor controller for 380V three-phase induction motors, rated 800A. Built on power electronics and microprocessor control with SCR-based smooth acceleration, it delivers advanced control and protection for heavy-duty industrial applications, replacing star-delta and auto-transformer starters with no external bypass contactor required.
Key Features
- 3 start modes: Current-limit / Voltage-ramp / Kick-start ramp for high-torque loads
- 2 stop modes: Free stop / Soft stop (prevents water hammer)
- Real-time 3-phase current display with independent calibration
- Bilingual LCD (Chinese/English), stores last 12 fault records
- Dual programmable relay outputs + 4-20mA analog output + RS485 Modbus RTU (standard)
- No external bypass contactor needed, simplest wiring among all soft starter types
Applications
- Heavy-Duty Industrial Motors, robust control for demanding high-power applications
- Compressors, controlled acceleration protects valves and reduces pressure spikes
- Conveyors, gentle load engagement, less mechanical shock on belts and gearboxes
- Pumps & Fans, smooth start reduces water hammer and belt/duct stress
Technical Parameters
| Parameter |
Specification |
| Model |
RQ6000-400KW |
| Rated Power / Current |
400kW (535HP) / 800A |
| Input Voltage |
AC380V ±15%, 50/60Hz |
| Applicable Motor |
Squirrel-cage induction motor |
| Enclosure |
Steel enclosure |
| Start Modes |
Current-limit (50–600% adj.) / Voltage-ramp / Kick-start ramp |
| Stop Modes |
Free stop / Soft stop |
| Protection Rating |
IP00 (requires cabinet or indoor installation) |
| Cooling |
Forced air (dual fan) |
| Communication |
RS485 Modbus RTU (standard) |
| Analog Output |
4–20mA |
| Protections |
Phase loss, overload, overcurrent, over/under-voltage, 3-phase imbalance, underload, start timeout |
| Ambient Temp / Altitude |
-25°C~+40°C / ≤2000m |
| Starting Frequency |
≤15 starts/hour |
Selection Tip
Recommended soft starter power = Motor Power × Load Factor (Pump/Fan: 1.2, Conveyor: 1.3, Compressor: 1.5, Crusher/Mixer: 1.6). Not sure which factor applies? Use our Soft Starter Selection Calculator: https://www.softstarterpro.com/blogs/selection-tools/soft-starter-selection-guide
