APC by Schneider Electric SRT1000RMXLA Smart-UPS On-Line 1000VA 2U Rackmount UPS
Overview
The APC by Schneider Electric SRT1000RMXLA is a 1000VA / 900W double-conversion online UPS in a 2U rackmount form factor — purpose-built for IT closets, edge deployments, and security infrastructure where clean, uninterrupted power is non-negotiable. Unlike standby or line-interactive designs that switch to battery only on failure, the SRT1000RMXLA operates in continuous double-conversion mode: utility power is constantly rectified to DC and re-inverted to AC, so connected equipment never sees raw grid power. Surges, sags, harmonics, and frequency anomalies are isolated completely before reaching your load. For rackmount UPS systems protecting network switches, NVRs, or access control servers, that topology difference matters significantly.
Key Features
- Double-Conversion Online Topology: The load runs off the inverter at all times — zero transfer time on utility failure. For security recorders, access control panels, and network infrastructure where even a 20ms transfer window causes a reboot or dropped connection, this is the topology that eliminates that exposure entirely.
- 900W / 1000VA Output Capacity: Enough headroom to carry a 16-channel NVR with attached drives, a PoE switch, and a firewall simultaneously — without pushing the UPS past 80% load, which is the operating ceiling you want to stay under for thermal and battery longevity reasons.
- Pure Sine Wave Output: Active PFC power supplies — standard on modern servers, NVRs, and managed switches — require a true sine wave to operate correctly. The SRT1000RMXLA delivers a clean sinusoidal waveform at all times, not a simulated or stepped approximation. Running active PFC equipment on a modified sine wave UPS risks hardware damage and unexpected shutdowns.
- Wide Input Voltage Window (50–150V) and Frequency Range (40–70Hz): The SRT1000RMXLA tolerates significant grid instability before drawing down the battery. In environments with chronic undervoltage or noisy utility feeds — older buildings, industrial facilities, sites near heavy machinery — this range means the battery is preserved for genuine outages rather than routine brownouts.
- Output Frequency Stability (50/60Hz): The inverter locks output frequency independently of input, ensuring downstream equipment sees a stable frequency even when utility frequency wanders. Relevant for facilities running mixed 50/60Hz equipment or generators with governor drift.
- 2% Output THD: Total harmonic distortion below 2% at full load means the power delivered to sensitive electronics is genuinely clean. High THD accelerates capacitor wear in power supplies and can introduce noise into analog audio or access control card readers sharing the same circuit.
- Emergency Power Off (EPO) Support: The EPO input allows a hardwired kill switch — a code requirement in many data center and server room deployments (NEC 645.11). Wire it to a wall-mounted EPO button near the room exit so personnel can cut power to the rack without touching energized equipment during an emergency.
- 432J Surge Energy Rating: Provides a documented suppression threshold for transient events. While double-conversion topology inherently isolates the load from most surges, the rated suppression capacity adds a defined protection level for catastrophic transient events that could otherwise reach the inverter stage.
- 6 × NEMA 5-15R Outlets: Standard 15A receptacles cover the majority of 1U and 2U rackmount equipment with standard C13/C14 or NEMA power cords. Plan your outlet count before committing — six receptacles on a 900W UPS means an average budget of 150W per outlet if fully loaded, but in practice you will cluster lighter loads and keep heavier draws on dedicated outlets.
- USB and Serial Management Interfaces: Both USB and DB-9 serial ports are present for direct local management and graceful shutdown signaling. Connect to a server or NVR host to trigger OS-level shutdown before battery depletion — critical for preserving file system integrity on recorders running continuous write workloads.
- Audible Alarms: On-battery, low battery, and overload alarms provide local audible indication without requiring network connectivity or a management card — useful in wiring closets and IDF rooms where no one is watching a dashboard.
Integration and Compatibility
The SRT1000RMXLA connects to any host system via USB or RS-232 serial for graceful shutdown integration. APC's PowerChute software (available separately) handles OS-level shutdown sequencing for Windows and Linux hosts. The unit accepts a SmartSlot accessory card for network management (AP9630/AP9631 Network Management Cards), enabling SNMP monitoring, remote outlet control, and integration into building management systems — the slot is not populated from the factory. The wide input frequency acceptance (40–70Hz) makes the SRT1000RMXLA generator-compatible without requiring tight governor regulation, which matters for sites using portable or permanently installed standby generators. For deployments requiring coordinated power protection across multiple racks, review the APC Smart-UPS line for higher-capacity rackmount options in the same family.
Frequently Asked Questions
Q: What is the difference between the SRT1000RMXLA and a line-interactive UPS?
A: The SRT1000RMXLA uses double-conversion online topology, meaning the load runs off the inverter continuously — there is zero transfer time on utility failure and all input power disturbances are isolated before reaching connected equipment. Line-interactive UPS units transfer to battery on outage (typically 2–20ms) and only partially condition power during normal operation. For security recorders, servers, and access control infrastructure, the online topology is a meaningful operational difference.
Q: Does the SRT1000RMXLA output a pure sine wave?
A: Yes. The SRT1000RMXLA delivers a pure sine wave output at all times from the inverter. This is required for equipment with active PFC power supplies — which includes virtually all modern servers, NVRs, and managed switches. Do not substitute a modified sine wave UPS for these loads.
Q: How many outlets does the SRT1000RMXLA provide, and what type?
A: Six NEMA 5-15R receptacles. These are standard 15-amp three-prong outlets compatible with typical 1U and 2U rack equipment power cords. The input plug is NEMA 5-15P, connecting to a standard 15A wall circuit.
Q: Does the SRT1000RMXLA support Emergency Power Off (EPO)?
A: Yes. The unit includes an EPO input for hardwired emergency shutoff — a requirement under NEC 645.11 for IT equipment rooms. Connect a normally-closed EPO button near the room exit to comply with code and allow personnel to safely de-energize the rack during an emergency.
Q: What management interfaces are available on the SRT1000RMXLA?
A: The unit provides both a USB port and a DB-9 RS-232 serial interface for local management and graceful shutdown signaling. A SmartSlot expansion bay accepts optional APC network management cards (sold separately) for SNMP-based remote monitoring and management.
Q: What input voltage and frequency range does the SRT1000RMXLA accept?
A: The unit accepts input voltages from 50V to 150V and input frequencies from 40Hz to 70Hz before switching to battery. This wide tolerance allows operation on generator power and in facilities with unstable utility feeds without prematurely depleting the battery.
The spec I always point integrators to first on the SRT1000RMXLA is the 2% output THD — that number tells you this is a genuine double-conversion inverter, not a marketing claim. At 900W continuous output with sub-2% distortion, you can confidently hang active PFC power supplies, PoE switches, and NVR recorders on this unit without worrying about harmonic stress accumulating in your equipment over a multi-year deployment.
Technical Highlights:
- Double-Conversion Topology: Zero transfer time on utility failure — the load never leaves the inverter. For NVRs running continuous RAID writes, even a 10ms gap can corrupt a file system. This topology eliminates that risk entirely.
- 50–150V Input Window: That 100V tolerance range is wider than most competing online UPS units at this capacity class. In older commercial buildings with chronic undervoltage, this means the battery stays in reserve for real outages rather than being cycled repeatedly on brownouts.
- EPO Input: Code compliance for NEC 645.11 IT equipment rooms is built in — no additional relay or external contactor needed. Wire a normally-closed pushbutton at the room exit and you are compliant out of the box.
Deployment Considerations:
- The six NEMA 5-15R outlets feed from a single 15A input circuit — budget your connected load carefully. At 900W across six outlets, the average per-outlet headroom is 150W, but a single NVR with four drives can draw 150–200W on its own. Map your actual load before commissioning.
- The SmartSlot bay ships empty. If remote SNMP monitoring is part of your project scope, budget for an AP9630 or AP9631 network management card separately — the USB and serial interfaces provide local shutdown signaling only, not network visibility.
The SRT1000RMXLA is a solid fit for a single-rack security or IT closet deployment where the load is one or two NVRs, a managed PoE switch, and a firewall — the 900W capacity and online topology match that use case precisely, and the EPO input satisfies code without additional hardware.
