BK-L31-20KVA丨3 Phase in/1 Phase out High-Frequency Online UPS

Product Overview

The BK-L31 Series is a high-performance Double Conversion UPS engineered for medium-to-large sensitive loads, featuring three-phase input and single-phase output. As a premium High-frequency double-conversion UPS, it adopts true online double-conversion architecture, enabling 0ms seamless transfer between mains and battery modes—completely isolating critical loads from grid fluctuations, harmonics, surges, and outages.

This online UPS supports customizable external battery configurations to meet extended backup time requirements, paired with a wide input voltage range and high input power facto. As a Transformerless online UPS (high-frequency design), it delivers a stable pure sine wave output with low harmonic distortion, making it an ideal Uninterruptible Power Supply for industrial control systems, data centers, medical equipment, and other mission-critical scenarios globally.

Applications

This versatile online UPS caters to diverse high-reliability scenarios, leveraging its three-phase input flexibility and external battery advantage:

Industrial Control Systems

Protects PLCs, automated production lines, CNC machines, and industrial robots. This Double Conversion UPS withstands grid instability and suppresses electromagnetic interference, avoiding costly production downtime.

Data Centers & IT Rooms

Powers servers, storage arrays, and network switches. The 0ms transfer time of this High-frequency double-conversion UPS prevents data loss, while low harmonic distortion ensures compatibility with precision IT equipment.

Medical Equipment

Supports high-power medical devices (e.g., diagnostic scanners, laboratory instruments). This Uninterruptible Power Supply delivers stable output voltage and low leakage current, meeting medical-grade power quality requirements.

Commercial Infrastructure

Covers financial server rooms, communication base stations, and smart building control systems. The wide input range of this UPS System adapts to complex urban grid environments.

 Energy & Transportation

Powers new energy station monitoring systems, substation automation equipment, and rail transit signal systems. 

Product Features

Three-Phase Input/Single-Phase Output Design

Adapted to medium-to-large three-phase power systems worldwide, while supporting single-phase sensitive loads—ideal for industrial and commercial scenarios where three-phase grid access is available but loads require single-phase power.

 True Double Conversion UPS Architecture

0ms transfer time between mains and battery modes; the inverter powers the load continuously, eliminating downtime risks for critical equipment— a core advantage of Double Conversion UPS.

High-Frequency Online UPS Design

Leverages a transformer-less high-frequency topology, enhancing power density and reducing energy loss—aligning with global energy-saving trends and lowering operational costs.

Wide Input Voltage Adaptability

Handles grid sags and surges without frequent battery activation, adapting to unstable grid conditions across regions.

Comprehensive Overload Protection

Multi-stage overload handling in AC and battery modes safeguards the UPS System and connected devices from damage, complying with international safety standards.

Specifications

Kindly note: The technical parameters provided here are for reference only and are intended as a selection guide. Given that the product offers various customization options, such as power rating, voltage configuration, battery solutions, and special certifications, the final product specifications will be subject to the final order document.