APC Smart-ups SRT 5000VA RM 208V IEC - SRT5KRMXLT-IEC

APC by Schneider Electric SRT5KRMXLT-IEC Online Double-Conversion Rack UPS

Overview

The APC Smart-UPS SRT SRT5KRMXLT-IEC is a 5 kVA / 4,250 W online double-conversion rackmount UPS designed for 208V environments requiring IEC outlet configurations. Double-conversion topology means utility power never passes directly to your load — every watt is rectified and re-inverted continuously, so voltage sags, surges, frequency drift, and waveform distortion are all filtered before they reach connected equipment. For sensitive servers, storage arrays, and medical or industrial gear on a 208V circuit, this architecture eliminates the transfer-time gap that line-interactive or standby designs leave open. The SRT5KRMXLT-IEC (often searched as SRT5KRMXLT IEC) belongs to APC's Smart-UPS SRT commercial line, engineered for data closets, edge deployments, and equipment rooms where power quality is non-negotiable.

Key Features

• 5 kVA / 4,250 W Online Double-Conversion Topology: True online operation regenerates a clean sine wave output at all times — not just during an outage. There is zero transfer time to battery, which matters when you're protecting IP PBX systems, rack-mounted NVRs, or network switches that will reboot on even a 10ms gap. The 4,250 W real-power rating (85% power factor) means you can load it to nameplate without derating concerns on most commercial equipment.
• Output Voltage THD <2%: A 2% total harmonic distortion figure on the output is well inside the tolerance of virtually all server-grade and networking power supplies. Unfiltered utility power routinely runs 5–8% THD; this UPS delivers better power than the wall, which directly reduces heat stress on connected equipment's power conversion components.
• Wide Input Voltage Window — 100V to 275V, 40–70 Hz: The broad input range means the unit rides through sustained browndowns and overvoltages without switching to battery unnecessarily. Running on battery burns cycle life; a wide input window preserves it. The 40–70 Hz frequency acceptance also makes this unit viable in regions with variable grid frequency, or on generator power where frequency often wanders outside standard 47–53 Hz tolerances.
• Pure Sine Wave Output: Active PFC power supplies — standard in modern servers, workstations, and high-end networking gear — require a sine wave input to operate correctly. Square-wave or stepped-wave UPS outputs will cause these supplies to run hot, throw error codes, or fail outright. This unit delivers a genuine sine wave throughout battery operation, not just on utility.
• 480 J Surge Energy Rating: The built-in surge suppressor handles 480 joules — enough headroom for typical transient events on commercial distribution panels. If your site has frequent lightning exposure or is on a distribution leg with heavy industrial loads cycling, consider supplemental panel-level surge protection upstream; 480 J is solid for a UPS but not a substitute for a dedicated whole-building SPD.
• 3:1 Crest Factor Handling: Server power supplies draw peaky, non-linear current — often with crest factors of 2:1 to 3:1. This UPS is rated to deliver a 3:1 crest factor without output voltage collapse, which means it won't clip waveform peaks under the real-world mixed loads typical in a server rack environment.
• IEC C13 and C19 Outlets with IEC Jumper Support: The outlet mix — C13 for standard 1U servers and peripherals, C19 for high-draw PDUs and dual-corded devices — covers the range of rack equipment you'll actually connect in a 208V build. IEC Jumper connectivity allows direct connection to rack PDUs without additional cabling, reducing cable clutter and connection points in dense deployments.
• Web-Based Management Interface: Remote power management via web interface means you can monitor load percentage, battery health, input/output voltage, and configure shutdown sequences without sending someone to the equipment room. In multi-site deployments or after-hours incidents, this is the difference between a managed response and a truck roll.
• Auto-Restart: After utility power is restored following an outage, the UPS can automatically restart and bring connected equipment back online without manual intervention. In unattended edge deployments — remote offices, surveillance closets, branch routers — auto-restart prevents a short outage from becoming a multi-hour service interruption.
• Audible Alarms: The unit provides audible notification for on-battery operation, low battery, and fault conditions. In equipment rooms without constant staffing, audio alarms are a practical first-alert mechanism that doesn't depend on network connectivity being intact when the alert is generated.
• 55 dB Noise Level: At 55 dB, this UPS is appropriate for office-adjacent or light industrial environments. It's not silent — plan accordingly if it's going in a workspace rather than a dedicated equipment room — but it's quieter than the fan noise of a fully loaded server rack.

Integration and Compatibility

The SRT5KRMXLT-IEC outputs at 208V with IEC outlet configurations, making it specific to 208V single-phase deployments. Before installing, confirm that all connected equipment is rated for 208V input — devices configured for 120V-only operation will be damaged. The unit accepts input between 100V and 275V, so it can draw from a standard 208V circuit or a 240V single-phase service without modification.

Web-based management integrates with network monitoring and DCIM platforms that accept SNMP or HTTP-based UPS data feeds. APC's UPS management ecosystem supports optional network management cards for deeper SNMP integration, automated server shutdown orchestration, and centralized fleet monitoring — confirm which NMC SKU is compatible with the SRT platform before ordering separately.

The double-conversion architecture and pure sine wave output make this unit compatible with any load that accepts 208V AC, including rack-mounted NVRs, server platforms, active PFC power supplies, and medical-grade equipment with tight power quality tolerances. For deployments pairing this UPS with managed PoE switches or IP security infrastructure, the clean output eliminates the power quality variables that can cause phantom reboots or degraded PoE negotiation on sensitive switch hardware.

If you're sizing this UPS for a mixed rack, calculate your actual watt draw — not VA — against the 4,250 W capacity. A rack of cameras, a mid-range NVR, and a PoE switch will typically land well under 1,500 W combined, leaving substantial headroom. For higher-density compute loads, cross-reference your server PSU wattage specifications against this unit's 4,250 W ceiling before committing. Consult the UPS selection guide for runtime and sizing methodology.

Frequently Asked Questions

Q: What is the difference between the SRT5KRMXLT-IEC and a line-interactive UPS at this power level?

A: The SRT5KRMXLT-IEC uses online double-conversion topology, which continuously regenerates output power from the inverter — there is zero transfer time to battery during an outage, and the output is fully isolated from utility power quality issues at all times. A line-interactive UPS passes utility power directly to the load under normal conditions and only switches to inverter during an outage, introducing a brief transfer gap (typically 2–10ms) and providing less isolation from voltage variations and harmonics. For loads sensitive to power quality or transfer gaps, double-conversion is the correct architecture.

Q: Does the SRT5KRMXLT-IEC output 120V or 208V?

A: This unit outputs at 208V with IEC outlet configurations (C13, C19, and IEC Jumper). It is not a 120V output UPS. Before connecting equipment, verify that all devices are rated for 208V input. Equipment configured for 120V-only operation must not be connected.

Q: What is the output THD of the SRT5KRMXLT-IEC?

A: Output voltage total harmonic distortion is less than 2%, which is cleaner than most commercial utility feeds. This matters for sensitive electronics and active PFC power supplies that are affected by harmonic content in the supply waveform.

Q: Can the SRT5KRMXLT-IEC operate on generator power?

A: Yes. The wide input frequency acceptance (40–70 Hz) and broad voltage window (100–275V) make this unit compatible with generator power, which often produces frequency or voltage variations outside utility norms. The double-conversion topology means input frequency variations are fully absorbed — the output is locked to 50 or 60 Hz regardless of what the generator delivers.

Q: Does this UPS support remote management?

A: Yes. The SRT5KRMXLT-IEC includes web-based management for monitoring load, battery status, and input/output conditions remotely. For SNMP-based integration with network management platforms or automated server shutdown, an optional network management card (sold separately) is required — verify the compatible NMC model for the SRT platform before ordering.

Q: What happens when utility power is restored after an outage?

A: The auto-restart feature brings the UPS and connected equipment back online automatically after utility power is restored. This is particularly useful in unattended edge locations, security infrastructure closets, and remote branch deployments where manual restart is impractical.

Ted Perry

The SRT5KRMXLT-IEC is the right call when your 208V rack load genuinely needs double-conversion protection — not just ride-through during outages, but continuous isolation from utility power quality. The sub-2% output THD spec is the number I'd point to first: utility feeds in commercial buildings routinely run 5–8% THD from variable-frequency drives, HVAC compressors, and lighting dimmers on shared distribution. This UPS scrubs all of that before it reaches your gear.

Technical Highlights:

• Double-Conversion at 5 kVA / 4,250 W: Zero transfer time to battery and full inverter isolation at all times. A 10ms transfer gap on a line-interactive unit will reboot some servers and network switches; this topology eliminates that failure mode entirely.
• 100–275V / 40–70 Hz Input Window: Wide enough to ride through extended brownouts and generator frequency drift without switching to battery. Unnecessary battery cycling is the primary cause of premature battery failure in UPS deployments — this input range minimizes it.
• 3:1 Crest Factor Output: Server PSUs draw peaky non-linear current. A UPS that can't deliver 3:1 crest factor will clip waveform peaks under real rack loads, causing output voltage collapse at the peaks and potentially triggering PSU protection circuits. This unit is rated for it.

Deployment Considerations:

• Confirm every device in the rack is rated for 208V input before powering on — this unit does not step down to 120V, and connecting 120V-only equipment will cause immediate hardware damage.
• At 55 dB, the SRT5KRMXLT-IEC is audible in quiet office environments. Plan for equipment room or closet installation, or account for the noise level in open-space deployments.

This unit is well-positioned for 208V edge data closets, IP security infrastructure rooms, and branch server racks where power quality problems (harmonics, sags, generator transitions) are the primary risk rather than extended outage duration. If your primary risk is long outages requiring multi-hour runtime, evaluate battery extension options for the SRT platform alongside this model.