APC Smart-ups SRT 10KVA RM with TWO 208V to 120V 2U 5KVA Step-down Transformers - SRT10KRMXLT-5KTF2

APC by Schneider Electric SRT10KRMXLT-5KTF2 10KVA Online Double-Conversion Rackmount UPS with Dual 208V to 120V Step-Down Transformers

Overview

The SRT10KRMXLT-5KTF2 is a 10 kVA / 10,000W double-conversion online UPS designed for rackmount deployments where equipment runs on 120V but your facility feed is 208V — a common mismatch in data centers, security operations centers, and enterprise server rooms that have moved to three-phase or higher-voltage distribution. Rather than running a separate line transformer, this unit bundles two 2U 5KVA step-down transformers directly into the package, delivering fully conditioned 120V output from a 208V input circuit without additional infrastructure. The SRT10KRMXLT-5KTF2 (often searched as SRT10KRMXLT 5KTF2) handles continuous online conversion, meaning your connected equipment never touches raw utility power — every watt passes through the inverter, eliminating the brief transfer gap that line-interactive or standby topologies accept.

Key Features

• Double-Conversion (Online) Topology: Unlike standby or line-interactive designs that switch to battery only on failure, the online double-conversion architecture continuously reconstructs output power through the inverter. Transfer time to battery is effectively zero milliseconds — critical for servers, storage arrays, and network equipment that cannot tolerate even a 4–8ms gap without potential data corruption or unexpected reboots.
• 10 kVA / 10,000W Capacity: At unity power factor (10 kVA = 10,000W here), there is no derating penalty — you can load this UPS to its full wattage rating without downgrading to a larger unit. Size it against your actual connected load and leave 20–30% headroom for startup inrush and future additions.
• Dual 5KVA 208V-to-120V Step-Down Transformers Included: Each 2U transformer module converts the 208V UPS output to 120V for equipment with standard North American plugs. Having two separate modules gives you the option to split critical loads across independent transformer circuits — a useful arrangement for segregating compute from networking or storage in the same rack footprint.
• Wide Input Voltage Window (100–275V): The unit accepts input anywhere from 100V to 275V at 40–70Hz, which means it rides through browndowns, overvoltages, and frequency fluctuations that would force a narrower UPS onto battery prematurely. In facilities with notoriously dirty utility power, a wide window extends battery life significantly by reducing unnecessary battery cycling.
• Pure Sine Wave Output at <2% THD: Output Total Harmonic Distortion under 2% means the power delivered to connected equipment is cleaner than most utility feeds. Active PFC power supplies — found in virtually all modern servers and network gear — require sine wave input; square wave or stepped approximations can cause overheating, noise, and shortened component life.
• 480J Surge Energy Rating: When a transient survives the double-conversion process (rare but possible on the input side before the rectifier), 480 joules of surge absorption capacity provides a secondary protection layer. This matters most for deployments near industrial equipment, HVAC compressors, or facilities with frequent lightning events.
• Emergency Power Off (EPO): EPO input allows a single dry-contact signal from a building management system, fire alarm, or dedicated EPO button to safely de-energize the UPS output instantly. In data center and security operations deployments where local fire codes or lease agreements require EPO, this is a must-have feature — not all UPS units at this capacity include it natively.
• Web-Based Management: Remote management over IP means you can monitor load, battery health, runtime estimates, and event logs without a technician physically at the rack. In multi-site deployments or when the UPS is in a locked cage or remote data room, this eliminates service truck rolls for routine status checks.
• 55 dB Noise Level: Rackmount UPS units at 10 kVA can be loud. At 55 dB — roughly the level of a quiet office or normal conversation — this unit is deployable in environments where acoustics matter: on-premise server rooms adjacent to open office space, command centers, or integrated security operations environments where staff work nearby.
• Audible Alarms: Local audible alerts for on-battery operation, low battery, and fault conditions ensure that on-site personnel are notified immediately even if network management software is unavailable or misconfigured.
• 3:1 Crest Factor Tolerance: A crest factor rating of 3:1 means this UPS handles loads with high peak-to-RMS current ratios — typical of switching power supplies — without clipping or output distortion. Equipment that draws power in sharp pulses (most server and networking hardware) will operate correctly without requiring oversizing of the UPS.

Integration and Compatibility

The SRT10KRMXLT-5KTF2 fits into standard 19-inch rackmount infrastructure. The included step-down transformers occupy 2U each, so account for rack unit consumption during planning. Input voltage range of 100–275V at 40–70Hz makes it compatible with a broad range of facility power configurations, including generator-backed circuits where frequency stability may vary slightly. Web-based management integrates with most data center infrastructure management (DCIM) platforms and building automation systems via standard protocols. The EPO terminal accepts industry-standard dry-contact wiring from building management or fire suppression control panels. For large Power and UPS deployments across multiple racks, coordinate transformer module assignments with your power distribution layout before installation to avoid output circuit overlap or cross-feeding scenarios.

Frequently Asked Questions

Q: What is the difference between double-conversion and line-interactive topology, and why does it matter for this UPS?

A: Double-conversion (online) topology continuously runs all connected load through the inverter — utility power is rectified to DC, then inverted back to AC. There is zero transfer time to battery on a power failure because the inverter is always active. Line-interactive designs switch to battery on failure, introducing a 4–8ms gap that can cause issues with sensitive servers and storage. The SRT10KRMXLT-5KTF2 uses double-conversion, making it appropriate for equipment with zero transfer-time tolerance.

Q: Do the step-down transformers in the SRT10KRMXLT-5KTF2 need to be purchased separately?

A: No. The two 2U 5KVA 208V-to-120V step-down transformers are included with the SRT10KRMXLT-5KTF2 as part of the bundled configuration. They do not require separate purchase or separate installation ordering.

Q: What input voltage range does the SRT10KRMXLT-5KTF2 support?

A: The unit accepts input voltage from 100V to 275V at frequencies between 40Hz and 70Hz. This wide window allows the UPS to ride through brownouts, overvoltages, and generator frequency variations without switching to battery unnecessarily, which preserves battery runtime for actual outages.

Q: Does the SRT10KRMXLT-5KTF2 include an Emergency Power Off (EPO) connection?

A: Yes. The SRT10KRMXLT-5KTF2 includes an EPO input that accepts a dry-contact signal from building management systems, fire alarm panels, or dedicated EPO buttons. This satisfies local fire codes and data center lease requirements that mandate the ability to de-energize UPS output from a single external control point.

Q: Is the output waveform a pure sine wave?

A: Yes. The SRT10KRMXLT-5KTF2 delivers a true sine wave output with Total Harmonic Distortion under 2%. This is the correct power type for servers, networking equipment, and storage arrays with active PFC power supplies, which require sine wave input for stable, efficient operation.

Q: Can the SRT10KRMXLT-5KTF2 be managed remotely?

A: Yes. The unit includes web-based management, allowing remote monitoring of load levels, battery status, runtime estimates, and event logs over IP. This eliminates the need for physical access during routine monitoring and supports integration with data center infrastructure management (DCIM) platforms.

Jerry Tildsen

The SRT10KRMXLT-5KTF2 solves a specific and common pain point: you have a 208V facility feed but a rack full of 120V equipment, and you need online-grade power protection without running a separate transformer outside the UPS chain. The bundled dual 5KVA step-down transformers mean the voltage conversion is handled within the power protection envelope — downstream equipment sees clean, conditioned 120V sine wave output at all times, not raw utility power that's been stepped down and then protected.

Technical Highlights:

• Zero-Transfer Double-Conversion: The online topology means there is no switchover event on utility failure — the inverter is always driving the output. For servers running transactional databases or real-time video recording applications, even a 6ms gap can trigger a UPS-induced reboot cycle. This architecture eliminates that risk entirely.
• Sub-2% Output THD: At less than 2% Total Harmonic Distortion, the output is cleaner than most utility feeds. Active PFC supplies — standard in all current-generation servers — are sensitive to waveform quality; poor THD causes these supplies to run hot and derate their output, which can translate to unexplained system instability under load.
• 100–275V Input Window: This range is wide enough to cover generator-backed circuits (which often drift in frequency and voltage during load transitions) and international facility feeds if the unit is ever redeployed. Narrower windows — common on budget UPS units — force unnecessary battery cycling during browndowns, degrading battery life over 12–18 months of operation.

Deployment Considerations:

• Account for rack space carefully: the base UPS unit plus two 2U step-down transformer modules means this configuration consumes meaningful rack unit space. Confirm your rack layout before ordering and plan cabling between the UPS output and each transformer module as separate runs.
• The 55 dB noise rating is acceptable for most server room environments, but if this UPS is being installed in a shared space or security operations center where staff work adjacent to the rack, verify the cumulative noise from all rackmount equipment — UPS fan noise adds to existing switch and server cooling noise.

The SRT10KRMXLT-5KTF2 is the right specification for enterprise security operations centers, on-premise data rooms, and physical security head-end closets where the facility runs 208V distribution but the installed equipment base — recorders, servers, managed switches — expects 120V and cannot tolerate any power transfer gap.