UPS Keor DK 311355 20000 VA, 3U

Product Code: 311355
Product Line: KEOR DK
Product Type: Tower 3U - 20kVA
Brand: Legrand

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Legrand Keor DK 311355 UPS Description

The Legrand Keor DK 311355 is a 20 kVA (20 kW) rack-mounted UPS featuring advanced On-line Double Conversion (VFI-SS-111) technology from Legrand. Designed in a compact 3U rack format, it provides stable and continuous power for critical systems such as servers, networking devices, data centers, and security systems, ensuring safe and uninterrupted operation even during power outages.

Key Features

On-line Double Conversion Technology (VFI-SS-111): continuously converts AC → DC → AC to deliver a perfectly stable output, completely eliminating electrical noise and voltage fluctuations.
High Power Capacity: delivers 20 kVA / 20 kW with a unity power factor (1.0) — providing 100% real power to connected equipment.
High Efficiency: achieves 96–98% efficiency, reducing energy consumption and minimizing heat generation.
Flexible “NO BATT” Design: supports connection to multiple external battery cabinets, allowing customized backup time according to application needs.
Compact 3U Rack Design: easy to install in standard network racks or professional server environments.
Smart Monitoring Interface: features a clear LCD touchscreen display, plus USB, RS-232, and SNMP communication ports for advanced remote management and monitoring.
Comprehensive Protection: safeguards against overload, overvoltage, short circuit, and deep battery discharge.
Versatile Applications: ideal for data centers, IT systems, telecommunications, CCTV, audio systems, and other equipment requiring reliable, uninterrupted power supply.

Technical Specifications

Parameter	Specification
Nominal Power (VA)	15,000
Active Power (W)	15,000
Technology	On-line double conversion (VFI-SS-111)
Output Waveform	Pure sine wave
Installation Type	19" Rack
Input Voltage	1-phase 230 V / 3-phase 400 V
Input Frequency	50/60 Hz ±5% (auto sensing)
Input Voltage Range (full load)	176–280 V (1-phase) / 305–485 V (3-phase)
Input Current THD	< 3%
Input Power Factor	> 0.99
Output Voltage	230 V / 400 V ±1%
Output Frequency	50/60 Hz (configurable via LCD) ±0.1%
Efficiency	Up to 96%
Crest Factor	3 : 1
Output Voltage THD	< 2% (linear load)
Output Voltage Tolerance	±1%
Maintenance Bypass	Optional
Extended Backup Support	Supported
Backup Time	Depends on external battery cabinet
Display	4.3" touchscreen with LED status bar
Communication Ports	RS-232, BMS
Network Interface (SNMP)	Integrated
Emergency Power Off (EPO)	Yes
Dry Contact Relays	Built-in
Parallel Operation	Supported
UPS Dimensions (W × H × D)	440 × 132 (3U) × 535 mm
Net Weight	20 kg
Battery Cabinet Dimensions (W × H × D)	440 × 132 (3U) × 570 mm
Operating Temperature	0 – 40 °C
Protection Degree	IP 20
Relative Humidity	≤ 95%, non-condensing
Noise Level (1 m)	≤ 55 dB
Compliance Standards	EN 62040-1, EN 62040-2, EN 62040-3