APC by Schneider Electric SURT15KRMXLT-1TF10K 15KVA Online Rack UPS with 208V/120V Step-Down Transformer

Overview

The SURT15KRMXLT-1TF10K is a 15,000VA / 12,000W double-conversion online UPS designed for data centers, server rooms, and enterprise security infrastructure that runs on 208V but must feed 120V loads — the integrated 10KVA 208V-to-120V step-down transformer eliminates the need for a separate PDU transformer in mixed-voltage racks. It occupies 16U of rack space and connects directly to a hardwired 208V three-wire feed, making it the right fit for purpose-built equipment rooms rather than general office closets.

Double-conversion online topology means utility power is continuously rectified to DC and then re-inverted — load devices never see raw utility waveforms. Voltage sags, surges, frequency drift, and harmonic distortion on the input side are absorbed before they reach connected equipment. This is meaningfully different from line-interactive designs that only condition power during events; with the SURT15KRMXLT-1TF10K, conditioning is continuous and the output is always inverter-derived.

Key Features

• 15,000VA / 12,000W Capacity: Handles dense equipment loads — a fully populated 42U rack with servers, switches, and storage can realistically draw 8–10KW; at 12KW capacity this UPS gives you headroom without running near the edge where runtime and overload margins shrink.
• Double-Conversion Online Topology: Zero transfer time to battery — because the load always runs off the inverter, there is no switching delay when utility fails. Critical for NVR systems, active network gear, and storage arrays that are sensitive to even a 4ms gap.
• Built-in 208V/120V 10KVA Step-Down Transformer: Feeds mixed 120V loads (NEMA L5-20R, L14-30R outlets) directly from a 208V input circuit. Eliminates the cost and rack space of a standalone isolation transformer when you have both 208V and 120V devices in the same stack.
• Output Connections — 10 Total Receptacles: Two NEMA L5-20R (120V/20A), four NEMA L6-20R (208V/20A), two NEMA L6-30R (208V/30A), and two NEMA L14-30R (120V/30A twist-lock) plus a hardwired 4-wire output. Covers virtually every common commercial receptacle type without adapters or additional PDUs for most deployments.
• 93% Efficiency at Full Load: At 12KW draw, the 7% loss translates to roughly 840W of heat continuously — that is 2,610 Btu/h of thermal dissipation you need to account for in your room cooling budget. Running below full load improves efficiency further.
• Built-in Static Bypass: If the UPS requires service or fails, connected loads are transferred to utility bypass rather than going dark. In a 24/7 security or data center environment, this is the difference between a maintenance window and an outage.
• Pre-installed Network Management Card 2: Out of the box, the UPS is network-addressable — you get SNMP monitoring, email alerting, web-based configuration, and integration with APC's PowerChute software without ordering a separate management module. Remote visibility into runtime, load percentage, battery health, and event logs is available from day one.
• Full-Time Multi-Pole Noise Filtering: IEEE surge let-through of 0.3% with zero-clamping response time means transient events on the input are attenuated before the inverter sees them. Relevant in facilities near industrial equipment, HVAC compressors, or elevators that inject noise onto shared electrical panels.
• Input Frequency Range 40–70Hz Auto-Sensing: Accepts generator output — most generators run at 57–63Hz under varying load; the 40–70Hz acceptance window keeps the UPS from switching to battery when a generator takes a few seconds to stabilize frequency after a utility transfer.
• Overload Tolerance: Handles 125% of rated load for 60 seconds and 150% for 30 seconds before tripping. In practice, this means a startup inrush or brief spike from spinning up motors or storage arrays won't immediately drop connected equipment.
• Four Included Battery Modules / 2.5-Hour Typical Recharge: The battery pack recharges to full in approximately 2.5 hours after a discharge event — important in environments with frequent utility instability where back-to-back outages are a real risk.
• Crest Factor 3:1: Tolerates highly non-linear loads (switching power supplies, VFDs, UPS-fed UPS configurations) without distorting output waveform — a pure sine wave output regardless of what the load looks like.

Integration and Compatibility

The SURT15KRMXLT-1TF10K accepts a single hardwired 208V two-phase input (2PH + G, up to 83A per phase) and is compatible with APC's SmartSlot expansion architecture — the pre-installed Network Management Card 2 occupies one slot, and additional SmartSlot cards can be added for relay output, modbus, or extended monitoring. The output hardwire connector (2PH+N+G, 4-wire) supports direct connection to a downstream panelboard for broader load distribution. Runtime can be extended by adding external battery modules (SURT192XLBP or equivalent); with zero empty battery slots in the base configuration, any runtime extension requires external battery frame/module pairs. Operating altitude ceiling is 10,000 ft — installations above that elevation require derating. The 50 dBA acoustic output is comparable to a mid-range CRAC unit; open-plan machine rooms are fine, but enclosed IT closets adjacent to occupied spaces may require acoustic treatment.

Frequently Asked Questions

Q: What is the input voltage requirement for the SURT15KRMXLT-1TF10K?

A: The SURT15KRMXLT-1TF10K requires a hardwired 208V two-phase input (2PH + G, single connector). It also accepts 240V on its secondary input. Maximum input current per phase is 83A, so your upstream breaker and wiring must be sized accordingly — typically a 100A breaker with appropriately rated conductors.

Q: Does the SURT15KRMXLT-1TF10K include a network management card?

A: Yes. A Network Management Card 2 comes pre-installed from the factory. This gives you immediate SNMP monitoring, web-based management, and PowerChute integration without any additional hardware purchase.

Q: Can the runtime be extended on the SURT15KRMXLT-1TF10K?

A: Yes, runtime is extendable. The base unit includes 4 battery modules with 0 empty slots, so runtime extension requires external APC battery module frames compatible with this UPS family. Typical recharge time after a full discharge is 2.5 hours.

Q: What output receptacles are available on the SURT15KRMXLT-1TF10K?

A: The unit provides: 2x NEMA L5-20R (120V/20A), 4x NEMA L6-20R (208V/20A), 2x NEMA L6-30R (208V/30A), and 2x NEMA L14-30R (120V/30A), plus a hardwired 4-wire (2PH+N+G) output. This covers most commercial server and network equipment receptacle types.

Q: What is the warranty on the SURT15KRMXLT-1TF10K?

A: APC provides a 2-year repair or replace manufacturer warranty on the SURT15KRMXLT-1TF10K.

Q: How much rack space does the SURT15KRMXLT-1TF10K require?

A: The unit requires 16U of rack space. Physical dimensions are 27.87 in H × 17.01 in W × 30.43 in D, and it weighs 766.61 lbs — floor load capacity and rack weight ratings must be verified before installation.

Ted Perry

The SURT15KRMXLT-1TF10K is one of the few rack UPS units in this power class that packages a 10KVA step-down transformer alongside a 15KVA double-conversion inverter in a single 16U chassis — that combination matters a lot when you're building out a mixed-voltage equipment room where both 208V servers and 120V security appliances need clean, conditioned power from a single upstream 208V feed. At 766 lbs installed, the structural and logistics planning starts before the equipment arrives.

Technical Highlights:

• Double-Conversion at 93% Efficiency: The always-on inverter path delivers zero-transfer-time battery switchover, critical for NVRs and storage arrays. At full 12KW load, 93% efficiency means 2,610 Btu/h of heat — size your room cooling with that number in hand, not as an afterthought.
• Overload Headroom — 125% for 60s / 150% for 30s: Real-world security infrastructure spikes on boot cycles and storage RAID rebuilds. This tolerance window means a transient overload from spinning up a multi-drive NVR won't immediately trip the UPS and drop your entire surveillance stack.
• Pre-installed Network Management Card 2: SNMP and web management are live the moment the unit powers up. For enterprise deployments running a NOC or DCIM platform, this eliminates the first post-install fire drill of sourcing and installing a management module separately.

Deployment Considerations:

• At 766.61 lbs, this unit requires a structural floor assessment and coordinated freight delivery — standard raised-floor data centers are typically rated 250–300 lbs/sq ft; verify before choosing a rack position, especially in older facilities.
• The 83A per-phase maximum input current means upstream wiring and breaker sizing must be handled by a licensed electrician at rough-in; the hardwired 3-wire input is not a field-installable plug connection.

This unit belongs in a dedicated equipment room — either a mid-size data center expansion or a purpose-built security operations hub where 208V utility feeds mixed-voltage security and IT loads and where a network power outage means loss of camera recording, access control, and communications simultaneously. It is not sized or priced for a single-closet deployment.