400 KVA UPS – Modular Three-Phase Online UPS 50–400KVA

Scale your critical power protection from 50KVA to 400KVA without replacing a single cabinet. The RM50 400 is a true double-conversion, three-phase online UPS built on hot-swappable 50KW modules — add capacity on the fly, replace a module without switching off your loads, and grow from 50KW to 400KW within a single footprint. With a 1.0 output power factor, 0ms transfer time, 96% efficiency, and an ultra-wide input range of 138–485VAC, this 400 KVA UPS delivers industrial-grade protection for data centers, telecom infrastructure, manufacturing automation, and medical facilities. Up to 8 power modules per cabinet, parallel capability for further expansion, and full communication via CAN, RS-485, network port, and optional SNMP make this a future-proof investment in uptime.

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Specifications — 400 KVA UPS (Model RM50 400)

Parameter	Detail
Model	RM50 400
Capacity	50–400KW (modular, 50KW per module, max 8 modules)
Phase	3-phase in / 3-phase out (3P4W+G)
Input Rated Voltage	380 / 400 / 415VAC
Input Voltage Range	138–485VAC
Input Frequency	40–70Hz (settable)
Input Power Factor	≥0.99
Input THDi	≤3% (100% non-linear load)
Generator Compatible	Yes
Output Rated Voltage	380 / 400 / 415VAC ±1%
Output Power Factor	1.0
Output Waveform	Pure Sine Wave
Output THD	≤2% (linear load); ≤3% (non-linear load)
Crest Factor	3:1
Transfer Time	0ms (mains → battery; mains → bypass)
Efficiency	Up to 96% (normal online mode)
Overload Capacity	110% / 60 min → bypass; 125% / 10 min → bypass; 150% / 1 min → bypass
Battery String Count	30–50 units selectable (default 36)
Battery Voltage Range	±180 to ±300VDC selectable (±180/192/204/216/228/240/252/264/276/288/300VDC)
Max Charging Current (module)	20A
Communication Ports	CAN, RS-485, Network port, Dry contact, Parallel port, LBS port, Intelligent slot, Temperature sensor port
Optional	SNMP card
Operating Temperature	0°C – 40°C
Storage Temperature	-25°C – 55°C (excluding batteries)
Relative Humidity	0–95% (non-condensing)
Altitude	≤1500m (derating above 1500m)
Noise	<70dB @ 1 metre
Cabinet Dimensions (L×W×H)	1200 × 850 × 2000mm
Cabinet Net Weight	280–600 kg (configured)
Module Dimensions (L×W×H)	440 × 620 × 130mm
Module Net Weight	36 kg
Standard	YD/T 2165-2010
OEM / Customization	Available

400 KVA UPS — High-Power Modular Protection Built to Scale

When your operation demands 400KVA of uninterrupted, clean power, you need more than a conventional UPS — you need infrastructure that scales with you. The RM50 400 is a high-frequency, true double-conversion three-phase online UPS that starts at 50KW and expands to 400KW within a single cabinet using hot-swappable 50KW power modules. No service windows. No forklift swaps. No downtime. Whether you are commissioning a new data center, expanding an existing one, or protecting high-value industrial or medical equipment, this 400 KVA UPS is engineered to grow alongside your operation.

True double-conversion means your load never touches the grid directly. Every watt delivered to your equipment is continuously regenerated by the inverter — filtered, stabilized, and isolated from voltage fluctuations, surges, brownouts, and frequency instability. In the event of mains failure or a bypass transition, the switch is 0ms, completely invisible to every connected device.

Built for the world’s most demanding grid conditions. With an input voltage range of 138–485VAC and a frequency window of 40–70Hz, this UPS operates reliably on weak grids, generator-backed supplies, and international voltages (380/400/415VAC) without derating. Input power factor exceeds 0.99 and input current harmonic distortion stays below 3% on non-linear loads, protecting upstream infrastructure and ensuring clean power draw throughout.

96% efficiency — more power delivered, less wasted. Compared to older-generation UPS architectures, the RM50 400 achieves up to 96% efficiency in normal online mode, reducing heat output, lowering cooling costs, and cutting electricity bills at scale. Over the lifetime of a 400KVA installation, this efficiency advantage translates into meaningful operational savings.

Modular architecture means maximum uptime during maintenance. Each 50KW power module is hot-swappable — you can insert, remove, or replace modules with the system fully energized. This eliminates planned maintenance windows entirely and reduces mean time to repair to minutes. Up to 8 modules populate the RM50 400 cabinet, and the system supports parallel configurations for N+1 or N+X redundancy as your criticality requirements grow.

Intelligent overload handling protects your loads gracefully. Rather than cutting out abruptly under overload, the system manages stepped overload conditions: sustaining 110% load for up to 60 minutes, 125% for 10 minutes, and 150% for 1 minute before transitioning to bypass — giving connected equipment time to shed load or shut down safely.

Flexible battery configuration for any runtime requirement. Battery string count is selectable from 30 to 50 units, with corresponding DC bus voltages from ±180VDC to ±300VDC. This lets you precisely tune backup runtime to your application, from short bridging intervals in generator-backed facilities to extended autonomy in standalone protection scenarios. Per-module charging current reaches 20A maximum.

Enterprise communication and monitoring as standard. The RM50 400 includes CAN bus, RS-485, a dedicated network port, dry contact port, parallel port, LBS port, intelligent expansion slot, and temperature sensor port. Optional SNMP integration enables full remote monitoring and management through network management platforms, building management systems, and web browsers across Windows, Linux, and Mac environments.

Comprehensive protection functions built in. Short circuit, overload, over-temperature, output over/under-voltage, battery undervoltage, fan fault, bypass flow backward, and lightning surge protection are all included as standard. Alarm functions cover mains abnormal events, overload conditions, UPS fault states, and battery undervoltage warnings — keeping your operations team informed before a problem becomes a failure.

Ideal for: large data centers and server rooms, enterprise network infrastructure, industrial automation and control systems, telecoms and broadcast facilities, precision medical equipment, and any mission-critical environment where 400KVA of protected power is non-negotiable.

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