APC by Schneider Electric SMX3000LVNCUS vs APC by Schneider Electric SMT3000RMT2U: Specification Comparison
Both the SMX3000LVNCUS and SMT3000RMT2U are APC Smart-UPS line-interactive, pure sine wave units rated at 3 kVA / 2700 W, designed for rack or tower deployment in IT and light industrial environments. The comparison centers on their input/output voltage configurations, physical and battery characteristics, and management capabilities — the primary decision axes for a buyer choosing between a 120 V North American feed and a 208 V single-phase feed in a data closet or small server room.
In This Guide
Which unit fits your electrical infrastructure — 120 V or 208 V?
The SMX3000LVNCUS is built for standard 120 V North American circuits. Its input operating range spans 70 V to 153 V, with a maximum output voltage of 120 V, and it connects via a 15 A maximum-current outlet — consistent with a NEMA 5-15 or 5-20 circuit. No input or output connector type is listed in the provided specifications.
The SMT3000RMT2U is designed for 208 V single-phase power. Its main input and output voltage are both specified at 208 V, the input connector is a NEMA L6-20P twist-lock, and the two output receptacles are NEMA L6-20R. This makes it the correct choice for environments where PDUs, server power supplies, or telecom gear are fed from a 208 V branch circuit.
These two units are not electrically interchangeable. Purchasing the wrong model for an existing electrical feed is a fundamental compatibility error. Confirm the branch circuit voltage before specifying either unit.
How do the battery and transfer characteristics compare?
The SMT3000RMT2U provides explicit transfer-time data: 4 ms typical, 8 ms maximum. Transfer time is not stated in the SMX3000LVNCUS specifications as provided; buyers requiring a confirmed transfer-time figure should consult APC's full datasheet for that model.
Battery details are substantially more complete for the SMT3000RMT2U. It specifies a lead-acid chemistry, a 3–5 year expected battery life, a 3-hour typical recharge time, a 188 W battery charge power rating, and replacement battery RBC43 with one RBC included. The SMX3000LVNCUS specifications provided do not include battery chemistry, recharge time, expected life, or replacement battery model.
Neither unit lists runtime curves or typical runtime at any specific load in the specifications supplied. Runtime at rated load would require the manufacturer's published runtime tables, which are not part of the input data here.
What are the physical, environmental, and management differences?
The SMT3000RMT2U occupies 2U of rack space, weighs 97.62 lb (44.28 kg), and is specified for rack-mounted, front-mounting installation. Its environmental envelope includes operating altitudes up to 10,000 ft, storage altitudes up to 50,000 ft, and 0–95% relative humidity. Acoustic output is rated at 55 dBA, and heat dissipation is 348 Btu/h. Its control panel is described as a multi-function LCD status and control console.
The SMX3000LVNCUS specifications do not provide weight, rack-unit count, operating altitude, storage conditions, or humidity ratings as supplied. It does specify EMI/RFI filtering at 55 dB, a surge energy rating of 540 J, an Emergency Power Off (EPO) function, and web-based management — none of which appear in the SMT3000RMT2U specifications as provided.
The SMX3000LVNCUS output voltage THD is capped at 5%; the SMT3000RMT2U specifies harmonic distortion as less than 5%. Both carry AVR and pure sine wave output. Only the SMX3000LVNCUS explicitly lists web-based management, EPO capability, and a surge energy rating in the provided specifications.
Which should you choose: the SMX3000LVNCUS or the SMT3000RMT2U?
Our take: The SMX3000LVNCUS is the stronger choice when the installation site runs on standard 120 V North American circuits and requires EPO, web-based management, and a documented 540 J surge energy rating — none of which appear in the SMT3000RMT2U specifications as provided. The SMT3000RMT2U is the correct and only viable choice when the branch circuit delivers 208 V single-phase power via a NEMA L6-20P feed, and it adds concrete operational data absent from the competing spec sheet: a 4 ms typical transfer time, a 3-hour recharge time, a 3–5 year battery life expectation, and a 348 Btu/h heat dissipation figure useful for cooling calculations. Both units share 3 kVA / 2700 W capacity and pure sine wave output. The decision is almost always driven by facility voltage first; only after confirming 120 V vs. 208 V do management features, EPO, and battery serviceability become the tiebreakers.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | APC by Schneider Electric SMX3000LVNCUS | APC by Schneider Electric SMT3000RMT2U |
|---|---|---|
| UPS Topology | Line-Interactive | Line-Interactive |
| Rated Capacity (VA) | 3000 VA (2.88 kVA listed) | 3000 VA |
| Rated Output Power (W) | 2700 W | 2700 W |
| Input Voltage | 70–153 V (120 V feed) | 208 V |
| Output Voltage | 120 V max | 208 V |
| Input Connector | — | NEMA L6-20P |
| Output Connectors | — | (2) NEMA L6-20R |
| Waveform | Sine | Sine wave |
| Output Frequency | 50/60 Hz | 50/60 Hz ±3 Hz sync to mains |
| Transfer Time | — | 4 ms typical / 8 ms maximum |
| Surge Energy Rating | 540 J | — |
| Output THD / Harmonic Distortion | 5% | Less than 5% |
| EMI/RFI Filtering | 55 dB | — |
| Emergency Power Off (EPO) | Yes | — |
| Web-Based Management | Yes | — |
| Battery Recharge Time | — | 3 h typical |
| Battery Life | — | 3–5 years |
| Replacement Battery | — | RBC43 |
| Rack Height | — | 2U |
| Weight | — | 97.62 lb (44.28 kg) |
| Heat Dissipation | — | 348 Btu/h |
| Acoustic Level | — | 55 dBA |
| Operating Altitude | — | 0–10,000 ft |
| AVR | Yes | — |
Frequently Asked Questions
Which should you choose: the SMX3000LVNCUS or the SMT3000RMT2U?
The SMX3000LVNCUS is the stronger choice when the installation site runs on standard 120 V North American circuits and requires EPO, web-based management, and a documented 540 J surge energy rating — none of which appear in the SMT3000RMT2U specifications as provided. The SMT3000RMT2U is the correct and only viable choice when the branch circuit delivers 208 V single-phase power via a NEMA L6-20P feed, and it adds concrete operational data absent from the competing spec sheet: a 4 ms typical transfer time, a 3-hour recharge time, a 3–5 year battery life expectation, and a 348 Btu/h heat dissipation figure useful for cooling calculations. Both units share 3 kVA / 2700 W capacity and pure sine wave output. The decision is almost always driven by facility voltage first; only after confirming 120 V vs. 208 V do management features, EPO, and battery serviceability become the tiebreakers.
Can I use either unit interchangeably on any standard US wall circuit?
No. The SMX3000LVNCUS is designed for 120 V circuits (input range 70–153 V, 15 A max). The SMT3000RMT2U requires a 208 V single-phase circuit with a NEMA L6-20P receptacle. Using the wrong unit on an incompatible feed is a wiring mismatch, not a configuration option.
Which unit is better documented for data center cooling and rack planning?
Based on the specifications provided, the SMT3000RMT2U supplies more planning data: 2U rack height, 97.62 lb weight, 348 Btu/h heat dissipation, 55 dBA acoustic rating, and defined environmental limits (altitude, humidity, storage temperature). The SMX3000LVNCUS specifications provided do not include those values; consult APC's published datasheet for the SMX3000LVNCUS before finalizing a rack or HVAC layout.
Does either unit support remote monitoring or emergency shutdown?
The SMX3000LVNCUS specifications explicitly list web-based management and Emergency Power Off (EPO). Neither feature appears in the SMT3000RMT2U specifications as provided. Buyers requiring confirmed EPO or network-card management on the SMT3000RMT2U should verify those capabilities directly against APC's full product documentation before purchasing.
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