APC by Schneider Electric SMX2KRMLVNCUS Line-Interactive Rack UPS, 1.92kVA / 1800W
Overview
The SMX2KRMLVNCUS is a 1.92kVA / 1800W line-interactive rack-mount UPS engineered for IT managers and network administrators who need clean, reliable power protection for servers, network switches, and IP security infrastructure. Line-interactive topology means the unit continuously conditions incoming power — correcting high and low voltage swings between 70V and 154V without switching to battery — so your connected equipment weathers brownouts and sags without burning through runtime reserves. Pair it with rack UPS systems from the broader APC by Schneider Electric catalog for a layered power protection strategy across your installation.
Key Features
- 1800W / 1.92kVA True Sine Wave Output: Pure sine wave output on battery means sensitive electronics — variable-speed drives, active PFC power supplies in servers and NVRs — behave exactly as they would on utility power. Square-wave or simulated-sine UPS units can trip or damage PFC supplies; this unit eliminates that risk entirely.
- Wide Input Voltage Window (70V–154V): The unit tolerates input as low as 70V before switching to battery. On circuits prone to brown-outs or voltage sag — common in older commercial buildings or end-of-run branch circuits — this range keeps you on conditioned utility power instead of depleting the battery on every sag event.
- Line-Interactive Topology: Unlike standby designs that only engage on full outage, line-interactive continuously regulates output voltage. Transient sags and swells are absorbed by the boost/buck circuit, not the battery — extending battery service life in environments with frequent but brief voltage anomalies.
- 540J Surge Energy Rating: 540 joules of surge absorption handles spikes from nearby lightning strikes or switching transients on commercial power distribution. Equipment downstream — switches, NVRs, cameras powered through midspans — stays protected without requiring separate surge strips.
- SmartSlot Expansion: The onboard SmartSlot accepts optional network management cards, enabling SNMP-based monitoring, automated shutdown scripting, and integration with data center infrastructure management (DCIM) platforms. For remote sites or unmanned equipment rooms, this is the path to graceful OS shutdown before runtime runs out.
- USB + RJ-45 Serial Interface: Dual management interfaces (USB and RJ-45 serial) give you flexibility to connect to a wide range of host systems for local power management and automated shutdown without additional adapters. Both interfaces are present simultaneously.
- Mixed AC Outlet Complement: Ships with NEMA 5-15R, 5-20R, and L5-20R receptacles, covering standard 15A and 20A straight-blade loads as well as locking 20A circuits commonly used for network rack power distribution. The input plug is NEMA 5-20P, drawing from a standard 20A branch circuit.
- Audible Alarm System: Four distinct alarm modes — on-battery, battery replacement due, low battery, and overload — give on-site staff immediate audible indication of power events without requiring software. In unmanned wiring closets, the overload and low-battery alarms are often the first alert that something needs attention.
- 50/60 Hz Input Compatibility: Accepts both 50Hz and 60Hz input, making the unit deployable in North American facilities without frequency-lock concerns if the building's power distribution has been modified or if equipment is being staged for international deployment.
Integration & Compatibility
The SMX2KRMLVNCUS connects to Windows, Linux, and macOS hosts via USB or RJ-45 serial for power management software integration. The SmartSlot accepts APC network management cards (sold separately) for SNMP v1/v2c/v3 monitoring, EcoStruxure IT integration, and automated shutdown policies — critical in any deployment where a server or NVR must shut down gracefully before battery runtime expires. For IP security deployments, this unit is well-suited to back up network video recorders and the PoE switches that power cameras, keeping the recording chain live through short outages. Review your UPS runtime planning guide to match battery capacity to your specific load and required hold-time before specifying this or any rack UPS model. Output voltage stays within the 100V–127V range regardless of input fluctuation, protecting downstream equipment from both overvoltage and undervoltage conditions.
Frequently Asked Questions
Q: What is the output waveform of the SMX2KRMLVNCUS when running on battery?
A: The SMX2KRMLVNCUS produces a true sine wave output on battery. This is essential for loads with active power factor correction (PFC) power supplies — common in servers, NVRs, and enterprise network equipment — which can malfunction or trip on simulated-sine (stepped-approximation) waveforms.
Q: How low can input voltage drop before the SMX2KRMLVNCUS switches to battery?
A: The unit regulates output without switching to battery across an input range of 70V to 154V. Below 70V it transfers to battery. This wide window is particularly useful in facilities with aging wiring or long branch-circuit runs where voltage sag under load is common.
Q: What AC outlets does the SMX2KRMLVNCUS provide?
A: The unit includes NEMA 5-15R (standard 15A), NEMA 5-20R (standard 20A), and NEMA L5-20R (locking 20A) receptacles. The input power cord terminates in a NEMA 5-20P plug, requiring a 20A branch circuit.
Q: Does the SMX2KRMLVNCUS support network management card expansion?
A: Yes. The onboard SmartSlot accepts optional APC network management cards (not included), enabling SNMP monitoring, automated graceful shutdown, and integration with infrastructure management platforms. Without a management card installed, local management is available via USB or RJ-45 serial interface.
Q: What alarm conditions does the SMX2KRMLVNCUS signal audibly?
A: Four alarm modes are supported: on-battery operation, battery replacement needed, low battery warning, and overload condition. Each produces a distinct audible alert, providing on-site notification without requiring a connected host or management software.
Q: What is the surge energy rating of the SMX2KRMLVNCUS?
A: The surge energy absorption rating is 540 joules, providing protection against power line spikes and transients for connected equipment.
The SMX2KRMLVNCUS sits in a practical segment of the APC Smart-UPS line — 1800W is enough to carry a mid-density security rack (a 16- or 32-channel NVR, a managed PoE switch, and a firewall appliance) through a 5–10 minute outage, which covers the vast majority of utility blink events and gives you time for a controlled shutdown on longer interruptions. The 70V–154V input window is the spec I point integrators to first: on a construction-phase or older commercial site where brownouts are routine, this range keeps the battery fresh instead of cycling it every time the lights flicker.
Technical Highlights:
- True Sine Wave on Battery: At 1800W output with sine waveform, active-PFC server and NVR power supplies stay stable — no nuisance trips, no fan runaway, no risk of the NVR rebooting mid-incident and losing buffered footage.
- SmartSlot for Remote Management: Add an AP9631 or similar network management card and you get SNMP traps, automated shutdown scripting, and EcoStruxure visibility — the difference between knowing about a battery event at 2AM and finding out at 9AM when someone checks the closet.
- 540J Surge Rating: On circuits shared with HVAC or elevator equipment — common in commercial installations — 540J handles the switching transients that degrade unprotected network hardware over time.
Deployment Considerations:
- The input plug is NEMA 5-20P — verify your rack PDU or branch circuit is 20A-rated before installing. A 15A circuit will require a different UPS model or a dedicated 20A run.
- SmartSlot network management cards are sold separately; budget for one if graceful automated shutdown or remote monitoring is a requirement, as neither USB nor serial interfaces provide network-accessible management on their own.
The SMX2KRMLVNCUS is best matched to a single-rack security equipment room or wiring closet — a deployment where 1800W of protected capacity covers the critical load, the sine wave output protects PFC supplies in modern NVRs, and the SmartSlot leaves a clear path to adding network management as the site matures.
