ST31 10-20K Online UPS

//ST31 10-20K Online UPS

ST31 10-20K Online UPS

ST31 10KS-20KS is a double conversion topology on-line UPS with extremely low failure rate and easy repair(MTBF>100000h) .It offers ideal solution for the major power quality problems such as grid power failure, under voltage, over voltage, sag, surge, line noise, frequency variation, switching transient, harmonic distortion efficiently, and provides a reliable power protection to the customer equipment.ST10-20KS is applied with leading DSP control technology and offer multiple and extendable options to meet the increasing customized application demand.

  • Rated Power: 10-20KVA
  • Single phase (1/1) or three phase (3/1) input 
  • High efficiency: 94%
  • Battery Voltage: 192/240VDC





  1. DSP control with comprehensive protections for load and UPS
  2. Output power factor 0.9,offering more stronger load capability
  3. Intelligent fan speed control ,with 4 levels varying according to load and temperature
  4. High efficiency, (ECO mode)option
  5. Intelligent N+X parallel redundancy, up to 4 unit
  6. Conformal coating PCB for more critical operation environment
  7. Single phase (1/1) or three phase (3/1) input supply
  8. Convertor mode:input 50Hz,output 60Hz
  9. Advanced three electrical level inverter design.
  10. Extremely low failure rate and easy repair(MTBF>100000h)
  11. Multiple communication ports ,SNMP card, AS400 card(optional)


Model ST 3110K ST 3115K ST 3120K
Capacity(VA/W) 10KVA/9KW 15KVA/13.5KW 20KVA/18KW
Phase 3PH 4W+G
Voltage Range 210 ~ 475VAC
Frequency 46~64Hz; 50~60Hz Autoadaptation
Power Factor >0.99(Really three phase PFC)
Voltage Range 220/ 230/240* (1±1%) VAC
Frequency Range Main Mode: (46 ~ 54)Hz/(56 ~ 64)Hz
Battery Mode: 50 Hz(± 0.1%) Hz or 60 Hz(± 0.1%) Hz
Crest Ratio “3:1
Power Factor 0.9
Wave Form Pure Sine wave
Outlet Hard Wiring with Terminal Black
Transfer Time
Transfer Time Zero
Inverter to Bypass Zero
LED Panel Load/ Battery Capacity/ Main Mode/ Bypass Mode/ Fault
LCD Panel Load/ Battery/ Input/ Output/Operation Mode
Operating Environment 0- 40°C
Humidity 20-90 % (non-condensing)
Noise Level < 60dB @ 1 Meter
Temperature -25°C – 55°C(no battery)
Protection Load<105%, Keeping working; 105%1min; 125% 30sec
Efficiency Up to 94%
Battery Inbuilt /
Battery DC Voltage DC192V
Dimension D*W*H(mm) 248*500*616
Net Weight(kgs) 22 30 30
Smart RS-232/USB Supports Windows®98/2000/2003/XP/Vista/2008,Windows®7,Linux,and MAC
Optional SNMP Power management from SNMP manager and web browser


  • Brochure:
  • User Manual: