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The Legrand Keor DK 311351 is a single-phase UPS from the Keor DK series by Legrand, designed with advanced On-line Double Conversion (VFI-SS-11) technology. This professional-grade UPS delivers clean, stable, and uninterrupted power, providing comprehensive protection for sensitive equipment in data centers, network systems, telecommunications, building automation, and high-end technical infrastructures.
On-line Double Conversion (VFI-11) technology ensures that the load is always powered by the inverter, fully isolating it from the mains during power disturbances.
Output power factor = 1 (kVA = kW) — 6 kVA delivers a true 6 kW of power.
High efficiency: around 96% under normal operation, up to 98–99% in ECO mode.
Flexible installation: convertible Tower or 19" Rack configuration — ideal for server rooms or technical cabinets.
Extended backup capability: supports external battery cabinets, allowing customizable backup times.
Smart communication: includes USB, RS-232, and SNMP ports for remote monitoring and management.
Interactive display: 3.5" touch screen with LED status bar for easy operation.
Model 311351 refers to the 6 kVA “no-battery” version, according to the manufacturer’s product listing.
| Parameter | Specification |
|---|---|
| Nominal power (VA) | 6000 |
| Active power (W) | 6000 |
| Technology | On-line double conversion (VFI-SS-111) |
| Output waveform | Pure sine wave |
| Installation type | Convertible Tower / 19" Rack |
| Input voltage | 1-phase 230 V |
| Input frequency | 50/60 Hz ± 5% (auto sensing) |
| Input voltage range (full load) | 176 – 280 V |
| Input THD (current) | < 5% |
| Input power factor | > 0.99 |
| Output voltage | 230 V ± 1% |
| Output frequency | 50/60 Hz (configurable via LCD) ± 0.1% |
| Efficiency | Up to 96% |
| Crest factor | 3 : 1 |
| Output THD | < 3% (linear load) |
| Output voltage tolerance | ± 1% |
| Automatic bypass | Yes |
| External maintenance bypass | Optional |
| Backup time | – (depends on external battery cabinet) |
| Battery expansion | Supported |
| Display | 3.5" touchscreen + LED status bar |
| Communication ports | ROO, USB, RS232 |
| SNMP connectivity | Yes |
| Emergency Power Off (EPO) | Yes |
| Dry contact relay | Included |
| Parallel operation | Supported |
| Dimensions (H × W × D) | 440 × 88 (2U) × 700 mm |
| Weight | 18 kg |
| Operating temperature | 0 – 40 °C |
| Protection rating | IP 20 |
| Humidity | < 95% non-condensing |
| Noise level (1 m) | ≤ 55 dB |
| Standards compliance | EN 62040-1, EN 62040-2, EN 62040-3 |
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