APC by Schneider Electric SRT1000RMXLA-NC 1kVA Online Rackmount UPS
Overview
The APC by Schneider Electric SRT1000RMXLA-NC is a 1kVA (900W) double-conversion online UPS built for IT closets, network rooms, and security infrastructure racks where power quality directly affects uptime. Unlike standby or line-interactive designs that switch to battery only on failure, the SRT1000RMXLA-NC runs equipment continuously from its inverter — meaning your connected loads never ride dirty utility power and never experience the transfer gap that can crash sensitive electronics. If you're protecting UPS and power protection loads like NVRs, managed switches, or access control servers, double-conversion is the topology that eliminates transfer time entirely.
The -NC suffix designates the Network Card version, which ships with APC's network management card pre-installed — giving you remote shutdown, environmental monitoring, and outlet-level control without purchasing a separate card. This matters in distributed deployments where local hands-on access is limited.
Key Features
- Double-Conversion Online Topology: The inverter sits permanently in the power path, reconstructing a clean sine wave from DC bus power at all times. Utility voltage swings, brownouts, and harmonic distortion from other equipment on the circuit never reach your connected devices. For NVRs writing continuously to disk or access control panels with volatile memory, this zero-transfer-time architecture is the right specification — line-interactive UPS units introduce a 4–10ms transfer gap that some embedded systems don't tolerate.
- 900W / 1kVA Output at Pure Sine Wave: 900W of real power on a pure sine waveform matters when you're powering equipment with active power factor correction (PFC) power supplies — virtually all modern servers, NVRs, and managed switches use PFC supplies that require sine wave input to operate cleanly. Modified-sine or stepped-approximation UPS units can cause PFC supplies to run hot or shut down under load.
- Wide Input Voltage Range — 80V to 150V: The SRT1000RMXLA-NC accepts utility input from 80V to 150V before switching to battery. That's an unusually wide window for a 120V-class unit, which means the UPS rides through browndowns, sags, and overvoltages that would force a narrower-tolerance unit onto battery constantly. Fewer unnecessary battery cycles extends battery service life.
- Input Frequency Tolerance — 40 to 70Hz: The 40–70Hz input frequency window accommodates generator power, which often runs at non-nominal frequency under variable load. If your installation includes generator backup, this range prevents nuisance battery transfers when the generator stabilizes.
- 480J Surge Energy Rating: Built-in surge suppression rated at 480 joules protects downstream equipment from transient spikes that pass through utility wiring. This is line-side protection layered into the unit — not a substitute for upstream panel-level surge suppression in high-exposure installations, but meaningful for secondary protection on equipment circuits.
- 3:1 Crest Factor Support: A 3:1 crest factor rating means the inverter can handle loads with high peak-to-RMS current draw — common with switching power supplies and motor-start loads. Units with lower crest factor ratings clip these peaks, causing distortion on the output waveform that can manifest as premature equipment shutdown.
- Under 2% Output Voltage THD: Total harmonic distortion below 2% on the output means the SRT1000RMXLA-NC delivers cleaner AC than most utility feeds. For sensitive measurement equipment, audio DSP, or any load that reacts to harmonic content, this spec matters. Standard utility power in commercial buildings commonly runs 3–8% THD.
- Emergency Power Off (EPO): The EPO input allows a remote dry-contact switch to immediately cut output power — required by NEC and many local codes in raised-floor data rooms and server closets. Wire a wall-mounted EPO button at the room exit so personnel can de-energize the rack without touching energized equipment during an emergency.
- Web-Based Management (NC Card Included): The pre-installed network management card provides SNMP, web UI, and integration with APC's PowerChute software for graceful OS shutdown sequencing. In a multi-site security deployment, remote visibility into UPS runtime, battery health, and load percentage eliminates guesswork during an outage.
- 50dB Audible Noise: At 50dB, the SRT1000RMXLA-NC is within the range of normal office ambient noise levels. Double-conversion UPS units run their fans continuously (unlike standby units), so this measurement matters when the unit is installed in a shared workspace or open office network closet rather than a dedicated equipment room.
- NEMA 5-15R Outlets / NEMA 5-15P Input: Standard North American 15A receptacles on both input and output mean no adapter hardware or special wiring — plug into any standard 15A circuit, and your protected equipment connects with standard IEC-to-NEMA cords. Verify your total connected load stays below 900W; running double-conversion UPS units above 80% continuous load reduces battery runtime and inverter efficiency.
Integration and Compatibility
The SRT1000RMXLA-NC fits a standard 1U or 2U rackmount form factor and is designed for integration into equipment racks alongside network video recorders, PoE switches, and access control head-end equipment. The NEMA 5-15P input plug connects to any standard 20A or 15A branch circuit — no dedicated circuit required for a single unit at typical security infrastructure loads.
APC's PowerChute Network Shutdown software, compatible with the included network card, supports graceful shutdown sequencing across Windows Server, Linux, and VMware environments. For rackmount UPS deployments protecting virtualized security management platforms, sequenced shutdown prevents filesystem corruption on NVR storage volumes during extended outages.
The EPO terminal accepts standard dry-contact wiring, making it compatible with building management systems (BMS) and fire alarm relay outputs. This allows the UPS output to be cut automatically as part of a facility emergency response sequence without requiring manual intervention at the rack.
Frequently Asked Questions
Q: What is the difference between the SRT1000RMXLA-NC and the standard SRT1000RMXLA?
A: The -NC variant ships with APC's network management card pre-installed, adding SNMP monitoring, web-based management, and PowerChute Network Shutdown integration. The base SRT1000RMXLA requires a separately purchased AP9630 or AP9631 network card to achieve the same remote management capability.
Q: Is the SRT1000RMXLA-NC a true online double-conversion UPS?
A: Yes. The SRT1000RMXLA-NC uses double-conversion online topology, meaning connected equipment runs continuously off the inverter output — utility power never directly reaches the load. Transfer time to battery during a utility failure is zero milliseconds, as the inverter is already the active power source.
Q: What input voltage range does the SRT1000RMXLA-NC support?
A: The unit accepts input voltages from 80V to 150V and input frequencies from 40Hz to 70Hz before switching to battery. This wide range is particularly useful when the unit is fed from a generator that fluctuates in frequency under variable load.
Q: How many watts can the SRT1000RMXLA-NC support?
A: The SRT1000RMXLA-NC supports 900W of real power output (1 kVA apparent power). For continuous operation, plan to run no more than 720–750W of connected load (80% of rated capacity) to preserve battery runtime and inverter efficiency.
Q: Does the SRT1000RMXLA-NC require special outlet wiring or a dedicated circuit?
A: No. The unit uses a standard NEMA 5-15P input plug and connects to any standard 15A North American branch circuit. Output receptacles are NEMA 5-15R, compatible with standard 15A equipment cords — no special adapters or electrician work required for a typical installation.
Q: Does the SRT1000RMXLA-NC support Emergency Power Off?
A: Yes. The unit includes an EPO (Emergency Power Off) terminal that accepts a dry-contact signal to immediately cut output power. This is used with wall-mounted EPO switches in data rooms or can be wired to building management or fire alarm relay outputs for automated emergency de-energization.
When I spec UPS protection for a security rack, the first question is always topology — and the SRT1000RMXLA-NC removes that conversation entirely. It's double-conversion online, which means your NVR, access control server, or managed PoE switch is running off the inverter right now, not waiting for a transfer. That zero-millisecond transfer time is not a marketing claim — it's the physical consequence of the architecture, and it's why I reach for this unit when the load includes systems that log filesystem writes continuously.
Technical Highlights:
- Sub-2% Output THD: The SRT1000RMXLA-NC delivers output voltage total harmonic distortion below 2%, which is cleaner than most utility feeds in commercial buildings. Surveillance NVRs with switching power supplies and active PFC circuitry benefit directly — they're designed for clean sine input and will run cooler and more efficiently on it.
- 80V–150V Input Window: That 70V of input headroom means the unit rides through brownouts that would put a narrower-tolerance UPS on battery constantly. Fewer battery cycles under non-outage conditions directly extends the service interval on battery replacement — a real operational cost consideration in unmanned remote sites.
- 480J Surge Rating + EPO Terminal: The onboard 480J surge suppression is secondary protection — not a substitute for panel-level transient suppression — but it's meaningful for equipment-circuit protection on the output side. The EPO terminal wires directly to a dry contact, which integrates cleanly with fire alarm panels and BMS relay outputs without additional interface hardware.
Deployment Considerations:
- The NEMA 5-15P input limits this unit to a 15A branch circuit maximum. If your rack load profile is at or near 900W, verify the branch circuit is not shared with other significant loads — the breaker will trip before the UPS reaches its protection threshold if the circuit is already loaded.
- At 50dB continuous fan noise, double-conversion means the fan runs all the time — not just during events. In an open office or low-ambient environment, this is audible. Plan the rack location accordingly, or budget for an enclosure with acoustic treatment.
The SRT1000RMXLA-NC is the right call for a compact security equipment rack in a retail or branch office location where you need genuine online protection, remote monitoring via the pre-installed network card, and generator compatibility — without the installation overhead of a hardwired or three-phase unit.
