TM31E 3:1 Online Tower UPS 10–20 kVA
TM31E is an online double-conversion VFI tower UPS for sites with three-phase mains input and single-phase critical loads. It accepts 3-phase input and delivers protected single-phase output, with DSP control, output PF 1.0, 0 ms online transfer, wide input tolerance, generator compatibility, external battery runtime and parallel operation up to 4 units by configuration. Ideal for server rooms, telecom shelters, security systems, industrial control and IT loads supplied from a 3-phase building feed.
Engineered for 3:1 Critical Power
Three-phase input / single-phase output online UPS architecture for sites with 3-phase utility supply and protected single-phase IT, telecom or control loads.
3-Phase In / 1-Phase Out
Accepts 380 / 400 / 415 Vac three-phase input and delivers 220 / 230 / 240 Vac protected single-phase output for server rooms, telecom, security and IT loads supplied from a 3-phase building feed. 1-phase input / 1-phase output operation is also supported by configuration.
Online Double-Conversion VFI
True online UPS topology with IGBT inverter and DSP control provides pure sine wave output and 0 ms online transfer from AC to battery for sensitive single-phase critical loads.
PF 1.0 Output / Low Input THDi
Output PF 1.0 provides full usable kW capacity. Active input control delivers input PF ≥0.99 and THDi ≤3%, helping reduce upstream electrical stress and improve compatibility with cables, breakers and generators.
Wide Input & Generator Compatibility
Wide 208–478 Vac input tolerance and 40–70 Hz auto-sensing frequency support unstable utility supply, generator-backed sites and remote installations. Cold-start operation supports startup from battery when mains power is unavailable.
Parallel up to 4 Units
Up to 4 TM31E units can be configured in parallel for capacity expansion or N+X redundancy, subject to model configuration and project design.
Runtime & Monitoring Options
S models include internal batteries; long-runtime configurations support external battery cabinets. Communication options include SNMP, relay / dry contact, RS-232 / RS-485 and remote monitoring by configuration.
Expand Your System
Accessories for TM31E runtime extension, remote monitoring, parallel redundancy and maintenance bypass integration – available by configuration.
TM550 SNMP Card
Optional TM550 SNMP network card enables remote UPS monitoring, web access, event alerts and NMS / BMS integration. TM31E provides dual intelligent slots that can accept SNMP and / or relay cards by configuration.
External Battery Cabinet
TC-series external VRLA battery cabinets support long-runtime TM31E L configurations. Battery string quantity and DC bus voltage are configured according to model, backup-time target and project design.
Parallel Kit
Parallel cable / kit for connecting up to 4 TM31E units in N+X redundancy or capacity-expansion configurations. Parallel ports are provided on the rear panel.
External Maintenance Bypass Switch
External maintenance bypass switch supports UPS isolation for service while maintaining load supply, when installed and operated according to procedure. TM31E S and L variants also include internal maintenance bypass switching.
Technical Details
Complete specifications for the TM31E 10–20 kVA series.
| Specification | 10 kVA | 15 kVA | 20 kVA |
|---|---|---|---|
| Full Name | TM31E Three-Phase Input Online Tower UPS | ||
| 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 = internal battery / L = external battery cabinet) | ||
| 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 wide window (3-phase, 4-wire + PE) | ||
| Display | 2.4″ TFT or 7″ LCD (options) with status indicators | ||
| Operating Modes | Online (NOR), ECO, Bypass, Battery, Generator | ||
| Parallel | Up to 4 units (N+X), subject to model and project design | ||
| Standards | CE, IEC / EN 62040-1, IEC / EN 62040-2, IEC / EN 62477-1, EMC, LVD (by series) | ||
| Specification | 10 kVA | 15 kVA | 20 kVA |
|---|---|---|---|
| Input Voltage Range | 208–478 Vac (3-phase); 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 (generator compatible) | ||
| 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 | ||
| Output Breakers | 2×32 A | 2×50 A | 2×63 A |
| Efficiency (Online / VFI) | Up to 94.5% (all models) | ||
| Efficiency (ECO) | Up to 98% | Up to 98% | Up to 98.2% |
| 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) | ±120 Vdc nominal (16–20 pcs per string) |
| Bus Voltage (extended) | ±192 / ±204 / ±216 / ±228 / ±240 Vdc (32 / 34 / 36 / 38 / 40 pcs, configurable on LCD) |
| Battery String (S models) | 10 kVA: 16–20 pcs internal; 15–20 kVA: 2×20 pcs (±120 Vdc) |
| External Cabinets (L models) | TC40120N (2×20 pcs) or TC080120N (4×20 pcs) |
| Charge Current (S) | 10 kVA: 14 A; 15 kVA: 16 A; 20 kVA: 18 A (adjustable on LCD) |
| Charge Current (L) | 10 kVA: 1.35 A (2.7 A optional); 15–20 kVA: 2.7 A |
| Battery Life | 3–5 years at 25 °C (VRLA; depends on cycling and temperature) |
| 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 | ||
| Battery Cabinet TC40120N | 250×619×616 mm (wheeled) · 122 kg (7 Ah) / 134 kg (9 Ah) | ||
| Battery Cabinet TC080120N | 250×900×868 mm (wheeled) · 244 kg (7 Ah) / 265 kg (9 Ah) | ||
| Noise | <55 dB | <55 dB (15 kVA) / <58 dB (20 kVA) | |
| Colour | Black | ||
| Interface | Details |
|---|---|
| USB | Standard USB port (Type-B HID) |
| RS-232 | DB9 serial |
| RS-485 | Modbus RTU (BMS / PLC integration) |
| Dry Contact Port | Standard (event signalling) |
| EPO / REPO | EPO (L variant) / REPO – Remote EPO (S variant) |
| Intelligent Slots | 2× intelligent slots (Slot 1 + Slot 2 – both accept SNMP or Relay card) |
| Parallel Ports | Parallel Port 1 + Parallel Port 2 (for up to 4 units N+X) |
| EVENTS Port | For future expansion / event signals |
| Display | 2.4″ TFT or 7″ LCD (configurable); LED indicators for Line / Battery / ECO / Bypass / Battery Low / Overload / Fault |
| Optional Cards | TM550 SNMP card, Relay card, Parallel cable / kit, Battery temperature sensor |
Online Mode Overload
| Load Level | Duration | Action |
|---|---|---|
| ≤110% | 60 minutes | Sustained, then transfer to bypass |
| ≤125% | 10 minutes | Transfer to bypass |
| ≤150% | 1 minute | Transfer to bypass |
| >150% | Immediate | Transfer to bypass |
Battery Mode Overload
| Load Level | Duration | Action |
|---|---|---|
| ≤110% | 10 minutes | Sustained |
| ≤125% | 1 minute | Shutdown |
| ≤150% | 5 seconds | Shutdown |
| >150% | Immediate | UPS shutdown |
Protections & Alarms
| Protection | Description |
|---|---|
| Input | Over-voltage / under-voltage / over-frequency / under-frequency / phase loss |
| Output | Over-voltage / under-voltage / overload / short-circuit |
| Battery | Low-battery warning, over-discharge protection, reverse-polarity protection |
| Inverter | Over-temperature, fan failure detection |
| EPO / REPO | Emergency Power Off (L) / Remote EPO (S) |
| Alarms | Buzzer + LCD + LED indicators (Line / Battery / ECO / Bypass / Battery Low / Overload / Fault) |
| Parameter | Specification |
|---|---|
| Operating Temperature | 0–40 °C |
| Storage Temperature | −25 to ±55 °C |
| Relative Humidity | 0–95% non-condensing |
| Altitude | <1000 m full rated; 1000–3000 m with derating |
| Noise | <55 dB (10–15 kVA); <58 dB (20 kVA) |
| Protection Class | IP20 (indoor) |
| Cooling | Forced air (fan-cooled) |
| Safety | IEC / EN 62040-1, IEC / EN 62477-1 |
| EMC | IEC / EN 62040-2 (IEC 61000-4-2 / 3 / 4 / 5 / 6 / 8 / 11, IEC 61000-2-2) |
| Certifications | CE, EMC, LVD (by series) |
Ideal For
TM31E is designed for sites with three-phase utility or generator supply that need protected 220 / 230 / 240 Vac single-phase output for 10, 15 or 20 kVA critical loads.
Server Rooms & Small Data Centers
Clean 220 / 230 / 240 Vac single-phase output for server racks, switches, storage, firewalls and network equipment in buildings where the incoming electrical feed is three-phase.
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 Facility IT
Protected single-phase output for healthcare facility IT, laboratory instruments, monitoring systems and imaging support loads where a three-phase supply is available but the critical equipment is single-phase.
Industrial Control & Automation
Stable single-phase UPS output for PLC panels, HMI stations, SCADA workstations, industrial PCs and automation control cabinets supplied from plant three-phase distribution.
Security & Surveillance Systems
3:1 UPS backup for IP CCTV, NVRs, access-control servers, alarm panels and video-management workstations powered from a three-phase building feed.
Office IT & Critical Workstations
Single-phase UPS protection for branch office 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 Output or Standard Single-Phase UPS?
If TM31E’s 3-phase input / single-phase output architecture is not the right match, compare related ATENCO online UPS series for rack-mounted 3:1, full 3:3 three-phase or standard 1:1 single-phase applications.
TM31E 3:1 UPS FAQ
Answers about TM31E three-phase input / single-phase output architecture, 10–20 kVA capacity, PF 1.0 output, parallel operation, battery runtime 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?
Which applications is TM31E not recommended for?
Specify Your TM31E 3:1 UPS Project
Share your protected load list, target backup time, redundancy plan, 3-phase input voltage, generator details and monitoring requirements. ATENCO will recommend the suitable TM31E S or L configuration – 10, 15 or 20 kVA – with battery cabinet, parallel and TM550 SNMP / relay options matched to your project.
Send Project Requirements
Share protected load in kW / kVA, target runtime, redundancy requirement, site 3-phase input voltage, generator details and monitoring preferences such as TM550 SNMP, relay, BMS or NMS integration.
Receive UPS Selection & Sizing
ATENCO engineers recommend the suitable TM31E configuration: 10 / 15 / 20 kVA, S or L variant, battery / runtime option, parallel plan and matching TM550 SNMP or relay card accessories.