TM31E 3:1 Online Tower UPS 10–20 kVA
TM31E is an online double-conversion VFI tower UPS, available in 10, 15 and 20 kVA ratings, for sites with three-phase utility input and single-phase critical loads. It delivers PF 1.0 regulated pure sine-wave output with DSP digital control, wide input operating tolerance, generator-compatible operation by configuration and external battery options for extended runtime, and is designed in accordance with applicable IEC/EN 62040 safety, performance and EMC requirements.
Engineered for 3:1 Critical Power
Three-phase input and single-phase output online UPS architecture for sites with a three-phase utility supply and protected single-phase IT, telecom, security or control loads.
3-Phase In / 1-Phase Out
Accepts 380 / 400 / 415 Vac three-phase input and delivers 220 / 230 / 240 Vac single-phase output for critical loads supplied from a three-phase building network. TM31E supports both 3:1 and 1:1 operation by configuration.
Online Double-Conversion VFI
True online double-conversion architecture with IGBT power conversion and DSP digital control provides regulated pure sine-wave output and 0 ms transfer time between online and battery operation for sensitive single-phase critical loads.
PF 1.0 Output & Low Input Distortion
Output PF 1.0 provides full usable kW capacity. Active input power-factor correction delivers input PF up to 0.99 and input THDi as low as 3% at linear load under rated operating conditions, helping reduce upstream current demand and electrical loading.
Wide Input Operating Range
Three-phase input 208–478 Vac and single-phase input 120–276 Vac, with 40–70 Hz auto-sensing frequency, help maintain online operation during utility fluctuations and support generator-fed applications, subject to generator sizing, voltage regulation and frequency stability. Cold-start operation allows the UPS to start from battery when AC input is unavailable.
Parallel up to 4 Units
Selected TM31E configurations support parallel operation of up to four units for capacity expansion or N+X redundancy, subject to the approved model, parallel accessories and project design.
Flexible Runtime & Monitoring
Internal-battery and long-runtime configurations are available by model, with compatible external battery cabinets extending backup time by connected load and required runtime. Communication and control interfaces include RS-232, RS-485, USB, EPO, dry contacts and optional SNMP or relay cards by configuration.
Expand Your System
Optional accessories for runtime extension, remote monitoring, parallel operation and maintenance support – selected according to the TM31E model and project configuration.
External Battery Cabinets
Compatible external VRLA battery cabinets in 40-battery or 80-battery configurations provide extended runtime for selected TM31E long-runtime models. Battery quantity, DC bus voltage, cabinet configuration and charging capacity must match the UPS model, connected load and required backup time.
TM550 SNMP Network Card
Optional TM550 intelligent-slot card providing remote UPS monitoring, web-based access, event notifications and supported network-management integration. Where dual intelligent slots are provided, compatible SNMP and relay cards may be installed together, subject to the selected TM31E configuration.
Parallel Kit
Compatible parallel accessories allow selected TM31E configurations to operate with up to four units for capacity expansion or N+X redundancy. Parallel operation requires the approved model, matching UPS ratings, compatible firmware and the prescribed installation and commissioning procedure.
External Maintenance Bypass PDU
Provides an external bypass and isolation arrangement so the connected load can remain supplied during UPS service or replacement, subject to correct installation, available bypass power and the prescribed switching procedure. Selected TM31E configurations may also include a built-in manual maintenance bypass.
Technical Details
Complete specifications for the TM31E 10–20 kVA series.
| Specification | 10 kVA | 15 kVA | 20 kVA |
|---|---|---|---|
| Full Name | TM31E 3:1 Online Tower UPS (Three-Phase Input / Single-Phase Output) | ||
| Topology | Online Double-Conversion (VFI), DSP-controlled | ||
| Phase | 3P–1P (Three-Phase In / Single-Phase Out); 1P-1P mode also supported | ||
| Form Factor | Tower; S versions with internal batteries, L versions for configurable long-runtime external battery systems | ||
| Capacity | 10000 VA / 10000 W | 15000 VA / 15000 W | 20000 VA / 20000 W |
| Output Power Factor | 1.0 standard; output power may derate with 16 / 18-battery-string configurations | ||
| Input Voltage | 380 / 400 / 415 Vac nominal, 208–478 Vac in 3:1 mode. Optional 1:1 operation: 220 / 230 / 240 Vac nominal, 120–276 Vac operating range. | ||
| Display | 2.4″ TFT or 7″ LCD (options) with status indicators | ||
| Operating Modes | Online, ECO, bypass, battery, generator-fed and 50 / 60 Hz frequency-converter operation; 1:1 mode by configuration | ||
| Parallel | Up to 4 units (N+X), subject to model and project design | ||
| Input Source | Single three-phase input (standard); dual input source optional | ||
| Maintenance Bypass | Built-in manual maintenance switch; external maintenance bypass optional | ||
| Startup / Cooling | Self-test on startup; intelligent fan-speed control | ||
| Standards | IEC / EN 62040-1, IEC / EN 62040-2, IEC / EN 62040-3 and IEC / EN 62477-1; CE, EMC and LVD compliance by model / configuration | ||
| Specification | 10 kVA | 15 kVA | 20 kVA |
|---|---|---|---|
| Input Voltage Range | 208–478 Vac (3-phase, load-dependent); 120–276 Vac (1P-1P mode) | ||
| Input Nominal | 380 / 400 / 415 Vac (3P+N+PE); 220 / 230 / 240 Vac (L+N+PE for 1P-1P) | ||
| Input PF | ≥0.99 | ||
| Input THDi | ≤3% (linear load) | ||
| Input Frequency | 40–70 Hz auto-sensing | ||
| Output Voltage | 220 / 230 / 240 Vac selectable, ±1% | ||
| Output PF | 1.0 standard; output power may derate with 16 / 18-battery-string configurations | ||
| Output Frequency (battery) | 50 / 60 Hz ±0.1% | ||
| THDv | ≤2% linear / ≤5% non-linear | ||
| Transfer Time | 0 ms (AC→Battery); 0 ms (Inverter→Bypass) | ||
| Crest Factor | 3:1 | ||
| Bypass Breaker Rating | 2 × 32 A | 2 × 50 A | 2 × 63 A |
| Efficiency (Online / VFI) | Up to 93.5% | Up to 94.5% | Up to 94.5% |
| Efficiency (ECO) | ECO mode available; efficiency subject to confirmed model specification | ||
| Specification | Value |
|---|---|
| Battery Type | VRLA lead-acid maintenance-free 12 V (7 Ah or 9 Ah); internal on S models, external cabinet on L models |
| Bus Voltage (standard) | ±96 / ±108 / ±120 Vdc (16 / 18 / 20-battery configuration). Rated output follows battery quantity: 20 pcs = PF 1.0, 18 pcs = PF 0.9, 16 pcs = PF 0.8. |
| Bus Voltage (extended) | ±192 / ±204 / ±216 / ±228 / ±240 Vdc, corresponding to 32 / 34 / 36 / 38 / 40 batteries (configurable on LCD) |
| Battery String (S models) | 10 kVA Chassis 1: 20 × 12 V / 9 Ah (7 Ah optional); 10 kVA Chassis 2: 16 × 12 V / 9 Ah; 15 kVA & 20 kVA: 2 × 20 batteries, 9 Ah (7 Ah optional) |
| External Cabinets (L models) | 40-battery (2×20 pcs, ±120 Vdc) or 80-battery (4×20 pcs, ±120 Vdc) configurations |
| Charging Current (S, internal battery) | 10 kVA: 1.35 A (2.7 A optional); 15 / 20 kVA: 2.7 A |
| Max Charging Current (L, long-runtime) | 10 kVA: up to 14 A; 15 kVA: up to 16 A; 20 kVA: up to 18 A (adjustable on LCD) |
| Charger Note | Charging current is adjustable according to battery capacity and approved configuration. |
| Battery Life | Typical VRLA service life 3–5 years at 25 °C, depending on temperature, cycling and charging conditions |
| Specification | 10 kVA (S, Chassis 1) | 10 kVA (S, Chassis 2) | 15 / 20 kVA (S) |
|---|---|---|---|
| Form Factor | Tower (S = internal battery / L = long-run, external cabinet) | ||
| Dimensions S (W×D×H) | 250 × 900 × 868 mm | 250 × 645 × 715 mm | 250 × 900 × 868 mm |
| Weight S | 125 kg | 78 kg | 180 kg (15 kVA) / 181 kg (20 kVA) |
| Dimensions L (long-run unit) | 250 × 580 × 655 mm | ||
| Weight L (long-runtime UPS) | 10 kVA: 33 kg; 15 kVA: 37 kg; 20 kVA: 38 kg | ||
| Battery Cabinet (40-battery) | 250 × 619 × 616 mm (wheeled) · 122 kg (7 Ah) / 134 kg (9 Ah) | ||
| Battery Cabinet (80-battery) | 250 × 900 × 868 mm (wheeled) · 244 kg (7 Ah) / 265 kg (9 Ah) | ||
| Noise | <55 dB at 1 m | <55 dB (15 kVA) / <58 dB (20 kVA) at 1 m | |
| Colour | Black | ||
| Interface | Details |
|---|---|
| USB | USB communication interface, by model / configuration |
| RS-232 | RS-232 serial communication interface |
| RS-485 | RS-485 / Modbus RTU for building-management, PLC or control-system integration |
| Dry Contact Port | Dry-contact signalling interface, by configuration |
| EPO / REPO | Emergency Power Off interface, by model / configuration |
| Intelligent Slots | Up to two intelligent communication slots for compatible SNMP or relay cards, by configuration |
| Parallel Ports | Parallel communication interfaces for approved parallel configurations |
| Display | Segment LCD standard; optional 2.4-inch TFT colour display or 7-inch colour LCD by configuration |
| Optional Communication & System Accessories | TM550 SNMP card, relay card, parallel cable and battery temperature sensor, by configuration |
Online Mode Overload
| Load Level | Duration | Action |
|---|---|---|
| 100–110% | 60 minutes | Transfer to bypass after the stated duration |
| 110–125% | 10 minutes | Transfer to bypass after the stated duration |
| 125–150% | 1 minute | Transfer to bypass after the stated duration |
| >150% | Immediate | Transfer to bypass immediately |
Transfer to bypass requires bypass power to be available and within acceptable limits; otherwise the UPS may shut down.
Battery Mode Overload
| Load Level | Duration | Action |
|---|---|---|
| 100–110% | 10 minutes | UPS shutdown after the stated duration |
| 110–125% | 1 minute | UPS shutdown after the stated duration |
| 125–150% | 5 seconds | UPS shutdown after the stated duration |
| >150% | Immediate | Immediate UPS shutdown |
Protections & Alarms
| Protection | Description |
|---|---|
| Output | Overload, short-circuit and output low-voltage protection |
| Battery | Battery overcharge and overdischarge protection |
| Thermal | Overtemperature protection |
| Cooling System | Fan-fault alarm |
| Emergency Control | EPO interface by model / configuration |
| Alarms & Indication | Audible alarm and LCD / LED status indication according to display configuration |
| Parameter | Specification |
|---|---|
| Operating Temperature | 0–40 °C |
| Storage Temperature | −25 to ±55 °C |
| Relative Humidity | 0–95% non-condensing |
| Altitude | Below 1500 m without derating; derating required above 1500 m |
| Noise | <55 dB at 1 m (10 / 15 kVA); <58 dB at 1 m (20 kVA) |
| Cooling | Forced-air cooling with intelligent fan-speed regulation |
| Safety | IEC / EN 62040-1; IEC / EN 62477-1 |
| EMC | IEC / EN 62040-2 and applicable IEC 61000 series |
| Performance | IEC / EN 62040-3 |
| Compliance | CE, EMC and LVD by model / configuration |
Ideal For
TM31E is designed for 10, 15 and 20 kVA applications where a three-phase utility or generator source must supply protected 220 / 230 / 240 Vac single-phase critical loads.
Server Rooms & Small Data Centers
Clean single-phase online UPS output for server racks, switches, storage systems, firewalls and network equipment in buildings supplied by a three-phase electrical distribution system.
Telecom Shelters & Network Sites
3:1 online UPS protection for BTS, BBU, OLT, transmission equipment, routers and access-network loads in telecom shelters supplied by three-phase utility or generator power.
Healthcare & Laboratory IT
Protected single-phase output for healthcare IT, monitoring systems, laboratory equipment and supporting electronics where a three-phase site supply is available and the connected equipment requires single-phase power. Compatibility must be confirmed against load characteristics, leakage current, grounding and project requirements.
Industrial Control & Automation
Stable single-phase online power for PLC panels, HMI stations, SCADA workstations, industrial PCs and automation-control cabinets supplied from three-phase plant distribution. Suitability depends on load profile, inrush current, environmental conditions and project design.
Security & Surveillance Systems
3:1 online UPS backup for IP CCTV, NVRs, access-control servers, alarm panels and video-management workstations supplied from a three-phase building network.
Office IT & Critical Workstations
Single-phase UPS protection for branch IT rooms, file servers, VoIP systems, access control, security servers and critical workstations in commercial buildings with three-phase distribution.
Need Rack Format, 3:3 Power or a Standard Single-Phase UPS?
If TM31E’s three-phase input and single-phase output architecture is not the right fit, compare related ATENCO online UPS platforms for rack-mounted 3:1 applications, full three-phase systems or standard single-phase installations.
3:1 Rack/Tower UPS 6–10 kVA
- Three-phase input / single-phase output
- Rack/tower convertible design by model
- Online double-conversion VFI, DSP control
- Output PF 1.0, pure sine-wave
- 0 ms transfer time
- Parallel up to 4 units by model
3:3 Online Tower UPS 10–40 kVA
- Three-phase input / three-phase output
- Online double-conversion VFI, DSP control
- Output PF 1.0 kW/kVA
- Up to 94.5% efficiency by model
- ECO operation available
- Parallel up to 4 units, N+X by model
Online Single-Phase Tower UPS 1–10 kVA
- Single-phase input / single-phase output
- Online double-conversion, pure sine-wave
- Output PF 0.9
- Tower form factor
- Internal / long-runtime by model
- Office IT, telecom, networking, servers
TM31E 3:1 UPS Frequently Asked Questions
Answers about TM31E three-phase input and single-phase output architecture, 10–20 kVA ratings, PF 1.0 output, parallel operation, battery configurations and monitoring options.
What does TM31E mean?
What is the difference between TM31E and TM33E?
What capacities are available for TM31E?
Can TM31E run on a generator?
Can TM31E be paralleled for redundancy?
What monitoring options does TM31E support?
What battery runtime options are available for TM31E?
Does TM31E provide 0 ms transfer time?
Which applications are not suitable for TM31E?
Specify Your TM31E 3:1 UPS Project
Share your connected load, required backup time, redundancy plan, three-phase input voltage, generator details and monitoring requirements. ATENCO will recommend the suitable 10, 15 or 20 kVA TM31E configuration, battery system, parallel arrangement and compatible communication options for your project.
Send Project Requirements
Share protected load in kW / kVA, load type and peak or inrush current, required input mode (3:1 or 1:1), input and output voltage, target runtime or battery quantity, generator details, redundancy requirement, monitoring preferences and the installation environment.
Receive UPS Selection & Sizing
ATENCO will recommend the suitable TM31E rating and configuration, battery and runtime arrangement, parallel architecture and compatible monitoring accessories.