APC Smart-ups SRT 10KVA with TWO 208/240V to 120V 5KVA Step-down Transformers - SRT10KXLT-5KTF2

APC by Schneider Electric SRT10KXLT-5KTF2 10KVA Online Double-Conversion UPS with Dual 5KVA Step-Down Transformers

The SRT10KXLT-5KTF2 is APC's Smart-UPS SRT 10KVA online double-conversion unit bundled with two 208/240V-to-120V 5KVA step-down transformers — a single-SKU solution for facilities running mixed-voltage infrastructure where critical 120V loads must be protected from a higher-voltage distribution feed. If your server room, broadcast suite, or security operations center draws from a 208V or 240V distribution panel but houses equipment requiring 120V — rack-mounted servers, NVRs, network switches, workstations — this bundle eliminates the need to source a UPS and voltage conversion hardware separately. The SRT10KXLT-5KTF2 belongs to APC's Power & UPS line and addresses the specific pain point of mixed-voltage critical load environments.

Power Delivery Specifications

• 10 kVA / 10,000W Online Double-Conversion Topology: Unlike standby or line-interactive UPS designs that switch to battery only on failure, double-conversion continuously regenerates clean AC output from the DC bus. Your loads never run on raw utility power — the output is always synthesized. This eliminates transfer-time risk for zero-tolerance equipment like medical-grade servers, network video recorders running 24/7 surveillance workloads, or financial transaction systems.
• True Sine Wave Output: The SRT10KXLT-5KTF2 delivers a pure sine wave at all times — not a stepped approximation. Active PFC power supplies (standard in modern servers, UPS-grade switches, and high-density NVR appliances) require true sine wave input; square-wave or modified-sine output causes these PSUs to run hot, trip overcurrent protection, or fail prematurely. This matters in high-density racks.
• Dual 208/240V-to-120V 5KVA Step-Down Transformers: Each bundled transformer handles up to 5KVA of 120V load from the higher-voltage feed. Two transformers give you two independent conversion circuits — useful for distributing 120V loads across separate circuit branches for redundancy planning or PDU zoning. Step-down transformers in this class are isolation transformers, which also strip common-mode noise from the upstream distribution feed.
• Wide Input Voltage Window — 100V to 275V: The UPS accepts input anywhere from 100V to 275V before switching to battery. This wide window is a real operational benefit in facilities with fluctuating utility quality or in international deployments where nominal voltage varies. Fewer unnecessary battery cycles means longer battery service life.
• Wide Input Frequency Tolerance — 40 to 70 Hz: Accepting 40–70 Hz input protects the unit and connected loads in generator-fed environments where frequency regulation may not be tight, or during generator startup transients. Standard utility-only UPS units locked to 60 Hz ±2 Hz will switch to battery unnecessarily in these conditions.
• Output Voltage Range — 120V to 240V: The UPS output range combined with the step-down transformers allows the SRT10KXLT-5KTF2 to serve both the 120V loads (through the transformers) and direct 208/240V loads from the main UPS output simultaneously — covering a complete mixed-voltage equipment rack from one unit.
• 50/60 Hz Output Frequency: Synchronizes to utility frequency automatically, with clean switchover. Relevant for deployments running equipment with frequency-sensitive motors or clock-based timing circuits.

Protection and Redundancy

• 480 Joule Surge Energy Rating: The integrated surge suppressor absorbs 480J of transient energy — adequate protection against typical utility switching transients and nearby lightning strikes on a properly grounded distribution system. Note: this is not a substitute for whole-facility lightning protection on high-exposure sites; it handles what reaches the panel.
• 3:1 Crest Factor Support: Many UPS units struggle with non-linear loads (switching power supplies, variable-frequency drives) that draw current in sharp spikes rather than smooth sine waves. A 3:1 crest factor rating means the SRT10KXLT-5KTF2 handles peak currents three times the RMS value without clipping or output distortion — essential in mixed-load racks with multiple switching PSUs.
• Output Voltage THD ≤ 2%: Total harmonic distortion on the output is held below 2%, which keeps sensitive analog and RF equipment clean. In a security operations environment with audio/video processing equipment alongside servers, low THD output prevents ground-loop and noise artifacts that can degrade signal quality.
• Audible Alarms: Onboard alarm annunciation for battery operation, low battery, and fault conditions. In a staffed NOC or security operations center, local audio alarms provide immediate awareness without requiring monitoring software to be open — a practical backup to SNMP alerting.
• Auto-Restart: After a utility power restoration following a complete battery discharge, the SRT10KXLT-5KTF2 restarts automatically and brings connected loads back online without manual intervention. Critical for unmanned edge deployments, remote facilities, or after-hours outages where on-site staff are not available.

Management and Monitoring

• Web-Based Management Interface: The built-in network management capability allows monitoring and configuration through a standard browser — no proprietary management client required. Integration into existing DCIM, BMS, or security management infrastructure is straightforward via SNMP or the web interface. In network infrastructure deployments, this allows the UPS to participate in the same monitoring stack as switches and servers.
• 55 dB Noise Level: At 55 dB(A), this unit is within the range of a normal conversation — workable in equipment rooms adjacent to occupied spaces, though not silent. If the UPS must be installed in a noise-sensitive environment (broadcast booth, trading floor), account for this in your site plan. In a dedicated IDF or data center, it's a non-issue.

Integration and Compatibility

The SRT10KXLT-5KTF2 is designed for deployment in critical power environments where the distribution feed is 208V or 240V and the protected equipment requires 120V — a common scenario in North American commercial buildings where three-phase 208V distribution is standard but rack equipment is largely 120V-natively. The double-conversion topology and wide input window make this unit compatible with both utility-fed and generator-backed power plants. The web management interface supports integration into SNMP-based network management systems. For large-scale deployments or environments requiring hot-swap battery capability, review the SRT10KXLT runtime extension options within the APC Smart-UPS SRT family. Pair with a compatible rack PDU to distribute the SRT10KXLT-5KTF2's protected output to individual devices, and consider a dedicated network management card for advanced SNMP v3 integration and graceful server shutdown automation.

Frequently Asked Questions

Q: What does the double-conversion (online) topology mean for my connected equipment?

A: Double-conversion means your equipment never runs directly from utility power. The UPS continuously converts incoming AC to DC, then back to AC — so the output is always a clean, synthesized sine wave regardless of what the utility is doing. There is zero transfer time to battery during an outage because the inverter is always running. This is the correct topology for zero-tolerance systems like network video recorders, servers, and communications equipment.

Q: Why does this UPS come with step-down transformers, and do I need them?

A: If your building distribution feed is 208V or 240V but your equipment is rated for 120V, you need voltage conversion. The two bundled 5KVA transformers handle up to 5KVA each of 120V load from the higher-voltage feed. If all your equipment runs natively at 208/240V, you would not use the transformers — consider a standard SRT10KXLT without the transformer bundle instead.

Q: Does the SRT10KXLT-5KTF2 support generator input?

A: Yes. The wide input frequency range of 40–70 Hz is specifically designed to accommodate generator power, which can fluctuate during startup and under variable load. The wide input voltage window (100–275V) also absorbs generator voltage variation without switching to battery unnecessarily.

Q: What is the surge energy rating and is it sufficient for my installation?

A: The integrated surge suppressor is rated at 480 joules. This handles typical utility transients and switching surges. For sites with direct lightning exposure or poor utility quality, a dedicated whole-facility surge protection device upstream of the UPS distribution panel is the appropriate additional layer — the UPS surge suppressor is a last line of defense, not a primary lightning protection system.

Q: Can the SRT10KXLT-5KTF2 be monitored remotely?

A: Yes. The unit includes web-based management capability for browser-based monitoring and configuration. For SNMP integration, graceful server shutdown, or advanced alerting, an APC network management card installed in the UPS management slot extends these capabilities to enterprise-grade remote monitoring.

Q: Is the output waveform compatible with active PFC power supplies?

A: Yes. The SRT10KXLT-5KTF2 produces a true sine wave output at all times, including during battery operation. Active PFC power supplies — standard in modern servers, high-density network equipment, and broadcast gear — require true sine wave input to operate correctly. This unit is compatible.

Ted Perry

The SRT10KXLT-5KTF2 is the specific configuration I'd recommend when a customer has committed to 208/240V distribution for their critical power infrastructure but still has a significant 120V load fraction in the rack — which is the reality in most North American commercial deployments. The double-conversion topology means the 10,000W of protected output is always inverter-sourced; you're not gambling on a 2–10ms transfer window during a utility sag.

Technical Highlights:

• 3:1 Crest Factor: The 3:1 crest factor rating is the specification that gets overlooked most often on UPS RFPs. In a rack with 20+ switching power supplies, the combined peak-current demand can be two to three times the RMS load. A UPS that can't handle this clips the waveform and introduces distortion that degrades PSU efficiency and longevity. This unit handles it correctly.
• Output THD ≤ 2%: At under 2% total harmonic distortion, the SRT10KXLT-5KTF2's output is clean enough for audio/video processing and precision measurement equipment — not just IT loads. In a security operations center with analog-to-digital conversion happening on the same UPS circuit, this matters.
• 100–275V Input Window: The 175V span of acceptable input voltage means this unit absorbs what most generators and degraded utility feeds throw at it without switching to battery. Battery cycling is the primary driver of battery replacement cost; a wide input window directly reduces cycle count in imperfect power environments.

Deployment Considerations:

• The two 5KVA step-down transformers are bundled but require physical installation and wiring into the load distribution path — this is not a plug-in accessory. Factor installation labor and appropriate rackmount hardware into your project scope. Verify transformer mounting compatibility with your specific rack footprint before ordering.
• At 55 dB(A) operating noise, this unit is louder than a quiet office — plan accordingly if the installation point is adjacent to occupied space. In a dedicated equipment room or data center, this is not a concern.

This bundle is the correct answer for a multi-tenant commercial building's IDF room or a security operations center where the electrical contractor has run 208V home-run circuits to the rack but the integrator's equipment list is predominantly 120V — the SRT10KXLT-5KTF2 solves both the power protection and voltage conversion problem in a single procurement.