Automatic Capacitor Bank for Reactive Power Compensation | 20kvar | 480V | 7% Reactance | RS485 Modbus

Technical Specifications

Rated voltage: AC 400V (±10%)
Capacitor voltage: 480V
Rated power: 20 kvar
Reactance ratio: 7%
Frequency: 50Hz (±3%)
Compensation type: 3P3W / 3P4W
Switching response time: ≤200ms
Switching interval: ≥2s (configurable)
Max. number of connectable modules: 32 pcs
Thermal losses: <3W
Inrush current: ≤2.5 × rated current
Number of switching cycles: ≥1,000,000 operations
Annual failure rate: ≤0.1%
Capacitance decrease: <0.5% per year
Capacitance wear from switching: ≤0.1% / million cycles
Control accuracy: 100%
Protection functions: Fast current protection; Overload protection; Phase loss protection; Three-phase imbalance protection; Overvoltage / undervoltage protection; Temperature protection; Harmonic overload protection
Protocol: Modbus-RTU
Interface: RS485
Control modes: Auto / Manual
LCD display with error codes
Self-diagnostic function
Installation: Indoor
Dimensions: 192x440x360mm
Cooling: Forced air
Grounding: Via grounding bolt
Ambient temperature: -25°C ~ +55°C
Relative humidity: 20–90%
Altitude: ≤2000m
Compliance: GB/T15576-2008

Applications

Industrial enterprises: Production lines; CNC machines; Inverter-driven motors; Welding equipment; Frequency converters
Electrical engineers: Distribution network design; Power factor improvement; Energy audits
Electricians: Panel assembly; Modernization projects; Capacitor bank upgrades
Commercial facilities: Shopping centers; Logistics warehouses; Business centers; Low-voltage side of solar power plants

Main Advantages

Reactor protection against harmonics
Zero-cross switching – no current surges
≥1 million switching cycles lifetime
RS485 Modbus integration with BMS / SCADA
Self-diagnostics and LCD display
Low annual failure rate
Suitable for complex grid conditions

Possible Drawbacks

Professional installation required
Indoor use only