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Transformer-free KR11 Plus Series (1-10kVA)

Transformer-free KR11 Plus Series (1-10kVA)

Single Phase Online Transformer-free UPS (1-10kVA)

The KR smart high frequency online UPS uses full digital control technology and the latest high frequency converter technology and has high efficiency, high power factor and other advantages. It has significant energy savings and greatly reduces operation costs. It has integrated functions such as AC regulation, backup power supply, surge protection, and other functions to provide protection to equipment in harsh power grid environments and provide clean, safe, and stable power to loads.

  • Key Features
  • Technical Data
  • Related Solutions

Full Digital Control Technology

• Utilizes advanced DSP control technology, precision and fast data processing and has fast fault self-diagnosis and processing capabilities, as well as complete self-protection functions with high reliability

• Improved circuit integration, optimized circuit designs, improved anti-interference capabilities, and stabler performance

Excellent Performance, Outstanding Metrics

• Industry’s leading overall system efficiency; overall full load system efficiency of up to 95% and half load efficiency of up to 90%; huge energy savings and greatly reduces client’s operation costs

• Output power factor can reach as high as 1; industry leading performance, better loading capacity for the same power; cost effective and low system investment costs

• High power density, optimized structural design, rack thickness as low as 2U, smaller and more convenient, and reduces space usage

• Flexible battery configurations, supports 16-20 batteries configured in any way, improves the life cycle of old batteries and improves maintenance efficiency (6KVA models and above)

Great Power Grid Environment Adaptability

• Ultra wide input voltage range, adaptable to different usage environments; use in harsh power environments with ease

• Self adaptive to input frequency (50/60Hz), constant monitoring of power grid frequency; smart setup-free operation

• Mains power grid is prioritized to prevent frequent switching between mains and battery to extend battery life

Perfectly Compatible Generator

• Generators are suitable for AC power input; poor quality electricity produced by the generator is effectively isolated to prevent grid pollution to provide clean, safe, and stable power to loads

Complete Warning and Protection Functions

• Automatic self-detection upon startup which discovers hidden faults in a timely manner to ensure equipment safety and avoid unnecessary loss

• Complete protection and warning function sets off a sound and light alarm immediately to prevent hazards

• Supports input neutral/live wire detection to prevent fire hazard from incorrect neutral and live wire connection and to ensure personnel and asset safety

Environmentally Friendly Power, Double Protection

• Reliable electromagnetic compatibility characteristics, certified by authoritative organizations, suitable for professional high frequency communication, and audio and video broadcasting applications

• Input power factor > 0.99, input harmonics < 5%; improved energy utilization and effectively avoids additional energy loss; eliminates power grid pollution and reduces energy costs

Smart Fan, High Efficiency Cooling

• Multiple modes to control fan speed, extend the life of the fan and further improve efficiency and reduce power consumption

Large High-definition Screen, Perfect Visual Experience

• Well-proportioned visual effects, graphical interface, streamlined display, improved user experience

• Supports host temperature display, making it more easier to monitor temperature changes; more manageable device safety

Variety of dry contact signal and communication functions

• Standard communication: RS232, supports USB, SNMP, dry contact, EPO, etc.

• Smart monitoring of computers and the uninterruptible power supply can be implemented by a variety of communication methods to satisfy user’s remote management needs. Complete communication management functions allows easy monitoring of device statuses


KR1000+/ KR1000L+

KR2000+/ KR2000L+

KR3000+/ KR3000L+

KR6000+/ KR6000L+

KR1110S+/ KR1110+


Voltage (Vac)



Frequency (Hz)

50/60± 10% (50/60Hz auto-sensing)

Power Factor





Capacity (VA)






Max. AC/AC Efficiency






Power Factor

0.9 (1.0 optional)

Voltage (Vac)

208/220/230/240±1%selectable on display panel

Frequency (Hz)

50/60±0.2% (battery mode)


THD < 2% (linear load ); THD < 5% (nonlinear load )

THD < 1% (linear load ); THD < 4% (nonlinear load )

Transfer Time (ms)



Voltage (Vdc)

24 or 36/36

48 or 72/72

72 or 96/96




2×9Ah 12V or 3×7Ah 12V/


4×9Ah 12V or 6×7Ah 12V/


6×9Ah 12V or 8×7Ah 12V/


16×7Ah 12V/

External (16~20 units


16×9Ah 12V/

External (16~20 units


Charger Current (A) Max.




1~8 (adjustable)

1~8 (adjustable)


Communication Interface

RS232, EPO, USB (slot)

(SNMP, RS485+dry contact are optional in slot)

LCD Display

AC input & output voltage, frequency, Load level, battery level, temperature; AC mode, battery mode, bypass mode, and fault


Low battery, abnormal AC input, UPS failure, etc.


Low battery, overload, short-circuit and over temperature, etc.

Noise (dB)



Working Temperature ()


Relative Humidity

0 ~ 95%, no condensation

Dimension (W×D×H) mm




Weight (kg)

9.2 or 11.6/4.5

17.7 or 22.4/8.5

22.9 or 27.6/9.2



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