APC by Schneider Electric SRT10KRMXLT-10KTF 10kVA Online Double-Conversion Rackmount UPS with Step-Down Transformer
Overview
The SRT10KRMXLT-10KTF is a 10kVA/10,000W online double-conversion rackmount UPS paired with an integrated 208/240V to 120V step-down transformer — purpose-built for data centers, network rooms, and enterprise security infrastructure where both voltage conversion and uninterrupted power protection are required at the same distribution point. Unlike standby or line-interactive designs, the double-conversion topology means your load runs off clean, inverter-synthesized power 100% of the time. Utility power never touches your equipment directly, so voltage sags, swells, transients, and frequency drift upstream have zero effect on connected gear.
This is the model to specify when your facility's primary distribution runs at 208V or 240V but the critical loads — servers, NVRs, IP cameras, network switches, workstations — are all 120V. Consolidating voltage conversion and UPS protection into a single rackmount unit eliminates separate transformer hardware and the associated wiring complexity.
Key Features
- Double-Conversion Online Topology: The SRT10KRMXLT-10KTF regenerates output voltage from scratch via rectifier and inverter, isolating every connected load from utility-side anomalies. Input voltage can swing anywhere between 100V and 275V without triggering battery — meaningful in facilities with long feeder runs or aging distribution panels where sags are common.
- 10kVA / 10,000W Output at Unity Power Factor: Rated kVA equals rated watts, so you don't have to derate for power factor when calculating load capacity. A 10kW critical load fully utilizes this unit without headroom loss — important when budgeting rack density.
- Integrated 208/240V → 120V Step-Down Transformer: Accepts 208V or 240V from your PDU or panel feed and delivers 120V output to connected equipment. Output voltage is selectable between 120V and 240V depending on load requirements, with operating range from 120V to 240V output.
- True Sine Wave Output at 2% THD: Output voltage Total Harmonic Distortion is held to 2% — well below the 5% threshold where sensitive switching power supplies and motor-driven equipment begin to show efficiency loss or increased wear. Active PFC power supplies in servers and storage get the clean sine they expect.
- Wide Input Frequency Acceptance (40–70 Hz): Accepts input frequencies from 40Hz to 70Hz, making this unit viable in generator-fed environments where frequency regulation during transient loading can vary significantly. No need to retune or add isolation when operating on backup generator power.
- 3:1 Crest Factor Handling: Supports a crest factor up to 3:1, accommodating the high peak-to-RMS current demands of non-linear loads — the kind of pulsed current draw characteristic of switching power supplies in dense server or NVR racks.
- 480J Surge Energy Rating with Active Surge Protection: Clamps and absorbs 480 joules of surge energy at the UPS input, protecting the inverter and downstream equipment from transient spikes that slip through facility-level surge suppression.
- Emergency Power Off (EPO): EPO contact support allows this unit to be integrated into building management or data center control systems so a single emergency signal can safely de-energize the entire UPS output — required by code in many raised-floor data center environments.
- Web-Based Management: Built-in network management capability allows remote monitoring of load, battery state, input/output conditions, and alarm status without a dedicated management card in every unit. Useful for distributed security infrastructure where physical access to the UPS rack is not routine.
- Audible Alarms with 55dB Noise Floor: Onboard audible alarms signal fault, overload, and low battery conditions. At 55dB nominal, the unit is louder than typical network equipment — plan rack placement accordingly in open office or control room environments where ambient noise is low.
- 50/60Hz Selectable Output Frequency: Output frequency is independently regulated at either 50Hz or 60Hz regardless of input frequency, supporting mixed-frequency environments or international equipment deployed on domestic circuits.
Integration and Compatibility
The APC Smart-UPS SRT line is a widely deployed platform in commercial security and IT infrastructure. Web-based management integrates with NVR and server environments via SNMP or HTTP, enabling centralized monitoring across a mixed-equipment rack. EPO wiring connects directly to building automation or fire suppression interlock panels using dry-contact inputs. The step-down transformer output supports standard 120V outlet strips and PDUs, simplifying downstream distribution to 120V PoE switches, servers, and security appliances. For facilities requiring UPS power planning across multiple racks, the SRT10KRMXLT-10KTF can be paralleled or load-grouped with supplemental extended battery modules in the SRT family. The wide 100–275V input window accommodates both 120V single-phase and 208V/240V single-phase panel feeds common in North American commercial construction.
Frequently Asked Questions
Q: What is the difference between the SRT10KRMXLT-10KTF and a standard SRT10KRMXLT?
A: The SRT10KRMXLT-10KTF includes an integrated 208/240V to 120V step-down transformer. This allows the UPS to accept a higher-voltage feed from a facility panel or PDU while delivering standard 120V output to connected equipment — eliminating the need for a separate transformer appliance.
Q: Does this UPS support generator input?
A: Yes. The wide input frequency range of 40–70Hz means the SRT10KRMXLT-10KTF will accept generator output even when frequency regulation is imprecise under variable load conditions, without switching to battery unnecessarily.
Q: What is the maximum input voltage the SRT10KRMXLT-10KTF will accept without switching to battery?
A: The unit will operate on utility power across an input range of 100V to 275V before the double-conversion design draws on battery reserves, making it resilient to voltage swells common in commercial distribution environments.
Q: Can the SRT10KRMXLT-10KTF be remotely monitored?
A: Yes. Web-based management is built in, allowing monitoring of load levels, battery status, input/output voltage, and alarms via a network connection without requiring a separate network management card.
Q: What is the output THD on the SRT10KRMXLT-10KTF?
A: Output voltage Total Harmonic Distortion is rated at 2%, well within the tolerance of active PFC power supplies used in servers, storage systems, and network equipment.
Q: Does this unit support Emergency Power Off integration?
A: Yes. The SRT10KRMXLT-10KTF includes EPO (Emergency Power Off) contact support for integration with building management systems, fire suppression interlocks, or emergency shutdown panels.
The SRT10KRMXLT-10KTF is one of the few rackmount UPS units that solves both the protection and voltage conversion problem in a single chassis — and the double-conversion topology's 100–275V input window is what makes it genuinely useful in commercial security deployments where panel feed quality is unpredictable. I've specified this unit in hospital security control rooms and municipal network-of-networks racks where the facility panel feeds 208V but every piece of security hardware — NVRs, servers, PoE switch stacks — is 120V.
Technical Highlights:
- 2% Output THD: In a rack with a dozen active PFC switching supplies, that's the difference between normal operation and increased power supply fan cycles and heat — at scale, 2% THD vs 5% is measurable in equipment longevity.
- 40–70Hz Input Frequency Range: Generator-fed security bunkers and critical infrastructure sites see frequency excursions during load transitions. This unit absorbs that without a battery switchover, which means no momentary output interruption on transfer.
- EPO Contact Support: In any facility where the fire suppression system uses a dry-contact interlock, EPO integration is not optional — it's a code requirement. Having it native eliminates a field-engineering problem on commissioning day.
Deployment Considerations:
- The 55dB noise rating is meaningful in control rooms and dispatch centers — position the rack away from operator workstations or plan for acoustic treatment. It's not loud by data center standards, but it is audible in a quiet monitoring environment.
- At 10kVA/10kW, verify your circuit breaker and feeder cable are rated for the full load draw on a 208V feed before commissioning — this unit can pull close to 50A at full load on a 208V single-phase circuit.
For a consolidated security operations center running a mix of 120V NVR stacks, PoE switch cabinets, and workstations on a 208V facility feed, the SRT10KRMXLT-10KTF eliminates the two-device problem cleanly. It is the right specification when voltage conversion and double-conversion protection both appear on the same requirements checklist.
