RM33E 3:3 Online Rack UPS 10–50 kVA
RM33E is a high-density online double-conversion VFI rack UPS for three-phase critical power applications from 10 to 50 kW. It accepts three-phase input and delivers protected three-phase output, with DSP digital control, PFC input, output PF 1.0, input PF ≥0.99, low input THDi, 0 ms AC-to-battery transfer, wide 138–480 Vac input tolerance, adjustable external VRLA battery strings and N+X parallel redundancy. Available in 3U chassis for 10–30 kVA and 4U chassis for 40–50 kVA.
Engineered for 3:3 Rack-Mount Critical Power
Transformer-less online double-conversion three-phase rack UPS architecture for data centers, network rooms, industrial and critical infrastructure projects requiring protected three-phase output in 19″ cabinets.
3-Phase In / 3-Phase Out (3:3)
Accepts 380 / 400 / 415 Vac three-phase input (3Ph+N+PE) and delivers protected 380 / 400 / 415 Vac three-phase output with ±1% regulation for data center IT, network and critical three-phase loads.
Online Double-Conversion VFI
True online UPS topology with full DSP digital control and PFC input provides pure sine wave output and 0 ms AC-to-battery transfer for sensitive three-phase critical loads. DC cold-start supports startup from battery without utility.
3U / 4U Rack Form Factor
3U chassis for 10–30 kVA and 4U chassis for 40–50 kVA, fitting standard 19″ server cabinets for high-density data center, network-room and telecom deployments.
PF 1.0 Output / Up to 95.5% Efficiency
Output PF 1.0 (kW = kVA) provides full usable kW capacity. Online efficiency reaches up to 95.5%, while ECO mode is available up to 99% by model / configuration for energy saving in stable utility conditions.
N+X Parallel Redundancy
Direct parallel operation for capacity expansion or N+X redundancy: up to 4 units (10–30 kVA) or up to 6 units (40–50 kVA), subject to project design. 40–50 kVA models add an LBS port for coordinated multi-unit operation.
Wide Input & Generator Compatibility
Wide 138–480 Vac input range and 40–70 Hz auto-sensing input frequency support unstable utility and generator-backed sites. PFC input with PF ≥0.99 and input THDi ≤3% helps reduce upstream electrical stress.
Expand Your RM33E Rack UPS System
Accessories for RM33E external VRLA battery runtime, TM550 SNMP / relay monitoring, 19″ rack installation, parallel redundancy and maintenance bypass service – selected according to UPS capacity and project design.
External VRLA Battery System
RM33E L models use external VRLA battery strings for backup runtime. Battery quantity is configurable from 30 to 50 pcs of 12 V blocks, with DC bus voltage from ±180 to ±300 Vdc selected according to UPS capacity, load level and target backup time.
TM550 SNMP Network Card
Optional TM550 SNMP card enables web monitoring, event alerts, shutdown management and NMS / BMS integration. RM33E 10–30 kVA supports SNMP card monitoring; RM33E 40–50 kVA supports SNMP or relay card by configuration.
Rack Rail Kit
Rack rail kit supports secure RM33E installation in standard 19″ server cabinets. RM33E uses a 3U rack chassis for 10–30 kVA models and a 4U rack chassis for 40–50 kVA models.
Parallel Kit / LBS Synchronization
Parallel kits support N+X redundancy and capacity expansion: up to 4 units for 10–30 kVA models and up to 6 units for 40–50 kVA models. RM33E 40–50 kVA also supports LBS synchronization for dual-bus or coordinated multi-system designs.
Maintenance Bypass PDU
External maintenance bypass PDU supports UPS isolation, service or replacement while maintaining load supply, when installed and operated according to the approved maintenance bypass procedure.
Technical Details
Complete specifications for the RM33E 10–50 kVA three-phase rack UPS series.
| Specification | 10 kVA | 15 kVA | 20 kVA | 30 kVA | 40 kVA | 50 kVA |
|---|---|---|---|---|---|---|
| Full Name | RM33E Three-Phase Rack Online UPS | |||||
| Topology | Online Double-Conversion (VFI), DSP + PFC | |||||
| Phase | 3P–3P (Three Phase In / Three Phase Out) | |||||
| Form Factor | 3U Rack (440×670×130mm) | 4U Rack (440×800×175mm) | ||||
| Capacity | 10kW | 15kW | 20kW | 30kW | 40kW | 50kW |
| Output Power Factor | 1.0 (kW = kVA) | |||||
| Display | LED + LCD | |||||
| Operating Modes | Normal (Online), ECO, Bypass, Battery, Maintenance | |||||
| Parallel | Up to 4 units (N+X) | Up to 6 units (N+X) | ||||
| LBS Dual-System Sync | – | Supported | ||||
| DC Cold Start | Yes | |||||
| Standards | IEC/EN 62040-1, IEC/EN 62477-1, IEC/EN 62040-2, IEC/EN 62040-3 | |||||
| Specification | 10–30 kVA | 40–50 kVA |
|---|---|---|
| Nominal Input Voltage | 380/400/415Vac (3PH+N+PE) | |
| Input Voltage Range | 138–480Vac | |
| Input PF | ≥0.99 | |
| Input THDi | ≤3% (linear load) | |
| Input Frequency | 40–70Hz auto-sensing | |
| Output Voltage | 380/400/415Vac (3PH+N+PE), ±1% regulation | |
| Output PF | 1.0 (kW = kVA) | |
| Output THDv | ≤2% linear load; ≤4% / ≤5% non-linear load by model group | |
| Output Frequency (battery) | 50/60Hz ±0.1% | |
| Transfer Time | 0ms (standard online VFI) | |
| Crest Factor | 3:1 | |
| Efficiency (Online) | Up to 95.5% | |
| Efficiency (ECO) | Up to 98% | Up to 99% |
| Unbalanced Load | Fully supported | |
| Specification | 10–30 kVA | 40–50 kVA |
|---|---|---|
| Battery Type | VRLA (Lead-Acid), Maintenance-Free | |
| Battery String Range | 30–50 pcs (12V blocks) | |
| DC Bus Voltage | ±180 to ±300Vdc (360–600Vdc total) | |
| Max Charge Current | 18A | 20A |
| Charger Type | Intelligent 3-stage (CC→CV→Float) | |
| DC Cold Start | Supported | |
| Common Battery (parallel) | Supported | |
DC Bus Voltage & PF Derating
| Battery Count | DC Voltage | Output PF |
|---|---|---|
| 30 pcs | ±180Vdc | PF 0.8 (derated) |
| 32–34 pcs | ±192–±204Vdc | PF 0.9 (derated) |
| 36–50 pcs | ±216–±300Vdc | PF 1.0 (full rated) |
| Specification | 10 kVA | 15 kVA | 20 kVA | 30 kVA | 40 kVA | 50 kVA |
|---|---|---|---|---|---|---|
| Form Factor | 3U Rack | 4U Rack | ||||
| Dimensions (W×D×H) | 440×670×130mm | 440×800×175mm | ||||
| Weight | 25kg | 27kg | 27kg | 28kg | 45kg | 48kg |
| Noise | <55dB | <56dB | <58dB | |||
Cable Sizing (minimum mm²)
| Cable | 10 | 15 | 20 | 30 | 40 | 50 |
|---|---|---|---|---|---|---|
| AC Input | 4 | 6 | 10 | 16 | 25 | 25 |
| AC Output | 4 | 6 | 10 | 16 | 16 | 25 |
| DC Battery | 6 | 8 | 16 | 25 | 35 | 50 |
| Ground | 4 | 6 | 10 | 16 | 16 | 25 |
Circuit Breaker Ratings (external)
| Breaker | 10 | 15 | 20 | 30 | 40 | 50 |
|---|---|---|---|---|---|---|
| Mains (3P) | 20A | 32A | 40A | 63A | 80A | 100A |
| Bypass (3P) | 20A | 32A | 40A | 63A | 80A | 100A |
| Maint. (4P) | 20A | 32A | 40A | 63A | 80A | 100A |
| Output (3P) | 20A | 32A | 50A | 63A | 80A | 100A |
| Battery (3P) | 32A | 50A | 63A | 100A | 125A | 160A |
| Interface | 10–30 kVA | 40–50 kVA |
|---|---|---|
| USB | Type-B USB (9600bps, 8N1) | |
| RS-232 | DB9 Male (9600bps, 8N1) – cannot use with USB | |
| RS-485 | RJ45 for Modbus RTU + battery temp monitoring | |
| Intelligent Slot | 1× (SNMP card only – TM550) | 1× (SNMP or Relay card – TM550) |
| Dry Contact Port | 16-pin (4 in + 4 out) | – (use Relay card instead) |
| EPO | Emergency Power Off | |
| REPO | Remote Emergency Power Off (4-pin) | |
| Parallel Ports | 2× (up to 4 units) | 2× (up to 6 units) |
| LBS Port | – | Load Bus Sync (dual-system STS) |
| Backfeed Protection | 4-pin NC/NO | Optional port |
| BMS Port | Optional | – |
| Cold Start Button | Rear panel | |
| Temp Sensor | NTC via RS485 | |
| Display | LED + LCD with menu system | |
| Software | Muser5000 (Modbus protocol) | |
All Models – Overload Capacity
| Load Level | Duration | Action |
|---|---|---|
| ≤110% | 60 minutes | Sustained |
| ≤125% | 10 minutes | Transfer to bypass |
| ≤150% | 1 minute | Transfer to bypass |
| >150% | Immediate | Bypass / Shutdown |
| Parameter | Specification |
|---|---|
| Operating Temperature | 0°C to 40°C (derate 12% per 5°C above 40°C, max 50°C) |
| Storage Temperature | −25°C to 55°C |
| Humidity | 0–95% RH non-condensing |
| Altitude | <1000 m without derating; derating required above 1000 m according to altitude and load conditions |
| Safety Standards | IEC/EN 62040-1, IEC/EN 62477-1 |
| EMC Standards | IEC/EN 62040-2, IEC 61000 series |
| Performance | IEC 62040-3:2021, EN IEC 62040-3:2021 |
| Cooling | Intelligent fan speed control |
Heat Dissipation (Online VFI, PF 1.0)
| Model | 50% Load | 100% Load |
|---|---|---|
| 10 kVA | ~236W | ~471W |
| 15 kVA | ~353W | ~707W |
| 20 kVA | ~471W | ~942W |
| 30 kVA | ~671W | ~1414W |
| 40 kVA | ~942W | ~1885W |
| 50 kVA | ~1178W | ~2356W |
Ideal For
RM33E 10–50 kVA is designed for rack-mounted three-phase critical loads from 10 to 50 kW at PF 1.0 – data centers, network rooms, industrial control, telecom switching and command-room infrastructure requiring protected 3-phase output in standard 19″ cabinets.
Data Centers & Server Rooms
3:3 online rack UPS protection for three-phase server racks, PDUs, storage arrays, network cores and high-density IT loads in server rooms, small to mid-size data centers and edge deployments.
Network Rooms & Core Infrastructure
Rack-mounted three-phase UPS protection for network cores, switching systems, structured cabling rooms, distribution frames and core IT infrastructure in commercial, campus and enterprise environments.
Industrial Automation & Control
Clean three-phase power for PLC panels, SCADA systems, industrial PCs, automation control cabinets, instrumentation and process-control equipment supplied from plant three-phase distribution.
Telecom Switching & Network Nodes
Online three-phase rack UPS protection for telecom switching rooms, transmission equipment, access network nodes, microwave systems and core network infrastructure.
Healthcare Facility IT & Laboratory Systems
Three-phase rack UPS protection for healthcare facility IT, laboratory instruments, clinical monitoring infrastructure, imaging support systems and technical rooms – subject to project electrical and certification requirements.
Security Command & Control Rooms
Three-phase rack UPS support for centralized NVR / VMS server clusters, video-management workstations, access-control servers, monitoring walls and command-room infrastructure.
Need 3:1 Output, Tower Format or Higher Capacity?
If RM33E’s 3:3 rack architecture is not the right match, compare related ATENCO three-phase UPS series for three-phase-in / single-phase-out rack loads, floor-standing tower installations or higher-capacity projects.
RM33E 3:3 Rack UPS FAQ
Answers about RM33E three-phase input / three-phase output rack architecture, 10–50 kVA capacity, PF 1.0 output, parallel operation, external battery strings and monitoring.
What does RM33E mean?
What is the difference between RM33E and TM33E?
What capacities and rack sizes are available for RM33E?
Can RM33E run on a generator?
Can RM33E be paralleled for redundancy?
What battery options are available for RM33E?
What monitoring options does RM33E support?
What is LBS synchronization on RM33E?
Which applications is RM33E not recommended for?
Size Your RM33E Three-Phase Rack UPS Project
Share your three-phase load list, target backup time, redundancy plan, site voltage, generator details, rack space and monitoring requirements. ATENCO will recommend the suitable RM33E configuration – 10, 15, 20, 30, 40 or 50 kVA, 3U or 4U – with external battery string plan, parallel topology and TM550 SNMP / relay-card options matched to your project.
Send Project Requirements
Share three-phase load in kW / kVA, target runtime, redundancy requirement, site nominal voltage, generator details, available rack U-space and monitoring preferences such as TM550 SNMP, RS-485 / Modbus RTU, relay, BMS or NMS integration.
Receive UPS Selection & Sizing
ATENCO engineers recommend the suitable RM33E configuration: 10 / 15 / 20 / 30 / 40 / 50 kVA, 3U or 4U chassis, external battery string plan, parallel topology and matching TM550 SNMP or relay-card accessories.