20KVA High Frequency Online Tower UPS C20KS 3 in 1 out / 1 in 1 out Square Wave Output Double Conversion UPS For Data Center Telecom Industrial Control

20KVA High Frequency Online Tower UPS C20KS – Double Conversion Online UPS with Square Wave Output

Reliable, Compact and Generator-Compatible Power Protection for Data Rooms, Industrial Control and Telecom Sites

The C20KS high frequency online tower UPS is a 20 kVA / 18 kW double-conversion online uninterruptible power supply from FEI XIANG DA POWER. Built on DSP digital control and high-frequency PWM inverter technology, it rebuilds the output waveform from a stabilised DC bus, shielding your critical load from mains blackouts, voltage sags, surges, frequency drift and waveform distortion.

Thanks to its transformerless high-frequency architecture, the C20KS delivers a square wave output while staying remarkably compact and light – just 239 × 529 × 581 mm and 26.1 kg, compared with 109 kg for an isolation-transformer model of the same rating.

Key Features

• Double-Conversion Online Topology – The load never sees the raw mains waveform; line-to-battery transfer happens in 0 ms with no relay switching and no output interruption.
• 3-in / 1-out & 1-in / 1-out Wiring – Accepts a three-phase four-wire supply or a single-phase three-wire supply (R/S/T shorted), both without derating.
• Active Power Factor Correction – Input power factor > 0.99 for low harmonic pollution.
• Wide Input Window – Phase voltage 90–300 VAC (156–520 VAC line-to-line), frequency 40–70 Hz, keeping the inverter online through severe brownouts and frequency excursions.
• Accurate Output – 220/230/240 VAC ±2%, square wave output for resistive and switch-mode power supply (SMPS) loads.
• Strong Overload Capability – 105–125% for 10 min, 126–150% for 1 min, >150% for 100 ms.
• ECO Mode & Cold Start – Higher efficiency in ECO mode; can start and power the load with no mains present.
• 50/60 Hz Selectable – Fixed-frequency output or phase-locked tracking.

Typical Applications

The C20KS is ideal for data centres and server rooms, industrial automation and CNC control cabinets, medical diagnostic and laboratory instruments, telecom base stations and edge sites, security and traffic-control systems, and precision testing lines for export electrical products – as well as any site where mains quality is poor or a generator serves as primary or backup power.

Important – Square Wave Output

The C20KS is a transformerless high-frequency unit and therefore delivers a square wave, not a sine wave. It suits resistive loads and switch-mode power supplies (computers, servers, network and telecom equipment, LED drivers, laboratory instruments with electronic power stages). Loads that rely on a sine wave – motors and compressors, transformer-coupled or iron-core power supplies, audio equipment, and medical instruments requiring pure sine input – should be powered by an isolation-transformer model (e.g. 3C20KS-DP).

Technical Specifications (Highlights)

Quality Assurance

95% of core materials are self-produced or directly sourced from qualified suppliers, with full-process quality control from sheet metal to final assembly. Every unit passes 100% initial electrical safety testing and a 48-hour continuous aging test before delivery.

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