APC by Schneider Electric SMT750R2X122 vs APC by Schneider Electric SMT750CUS: Specification Comparison
Both units are APC Smart-UPS 750VA / 500W, 120V line-interactive UPS systems sharing the same core power rating and battery chemistry. The SMT750R2X122 is a 2U rackmount designed for data-center and equipment-rack deployment with a NEMA L5-15P twist-lock input, while the SMT750CUS is a tower-form desktop/floor unit with a standard NEMA 5-15P input. Buyers in the 750VA class will cross-shop these when deciding between rack integration and desktop placement, or when input-plug compatibility drives the selection.
In This Guide
- How do the two units compare on backup runtime, recharge, and battery performance?
- Which form factor and physical deployment model does each unit support?
- How do the two units differ in management interfaces, efficiency, and compliance certifications?
- Which should you choose: the SMT750R2X122 or the SMT750CUS?
- Side-by-Side Specs
- FAQ
How do the two units compare on backup runtime, recharge, and battery performance?
The SMT750R2X122 spec sheet lists a full-load runtime of 5 minutes and a half-load runtime of 16 minutes, with a 3-hour recharge time. The SMT750CUS spec sheet lists 4.5 minutes at full load and 16 minutes at half load, also with a 3-hour recharge time. At full load the SMT750R2X122 holds a 0.5-minute edge; at half load both units are equivalent. Transfer time to battery is specified only for the SMT750CUS at 6 ms; the SMT750R2X122 spec does not include this figure. Both units use sealed lead-acid battery chemistry.
Which form factor and physical deployment model does each unit support?
The SMT750R2X122 occupies 2U of rack space (3.3" H × 17" W × 26.3" D) and uses a NEMA L5-15P twist-lock input plug, requiring a matching receptacle in the rack PDU or wall circuit. Its six output receptacles are NEMA 5-15P standard. Physical dimensions and rack ears make it non-optional for rack integration.
The SMT750CUS specifies a 5.4-inch dimension (orientation not detailed in the provided spec) with a NEMA 5-15P standard input plug, shipping dimensions of 10.9" W × 19.6" D × 11.9" H, and a weight of 30.91 lbs. It targets desktop or floor placement. Form-factor dimensions for the SMT750R2X122 are in-rack measurements; the SMT750CUS shipping dimensions are the closest equivalent provided and are not directly comparable to installed rack dimensions.
How do the two units differ in management interfaces, efficiency, and compliance certifications?
The SMT750CUS provides USB and Ethernet (SmartConnect) remote management interfaces, one SmartSlot expansion bay, a specified efficiency of 97.2% at 25% load rising to 98.9% at 100% load, an output waveform specified as pure sinewave, a surge energy rating of 540 joules, and listed compliance with UL 1449, UL 1778, CSA, FCC Part 15 B, ICES-003, RoHS, and REACH. It also carries a stated equipment protection value of $150,000 USD and a 3-year limited warranty (2-year battery).
The SMT750R2X122 spec sheet does not include management interface details, SmartSlot presence, efficiency ratings, output waveform type, surge energy rating, compliance certifications, warranty terms, or equipment protection value. These attributes are absent from the provided specification data and cannot be assumed equivalent.
Which should you choose: the SMT750R2X122 or the SMT750CUS?
Our take: The SMT750CUS is the stronger choice when management capability, certified compliance, and documented efficiency matter to the buying decision. It specifies Ethernet and USB management with a SmartSlot expansion bay, pure sinewave output, 540-joule surge protection, 97.2–98.9% efficiency across load ranges, and UL 1449/UL 1778/RoHS/REACH certifications — none of which appear in the SMT750R2X122 spec sheet. The SMT750R2X122 is the correct selection when the installation requires a 2U rack-mount form factor or a NEMA L5-15P twist-lock input circuit, and it edges the SMT750CUS by 0.5 minutes at full-load runtime (5 min vs. 4.5 min). For IT closets and server rooms already wired to standard NEMA 5-15 circuits, the SMT750CUS delivers a materially richer management and compliance profile; for rack deployments with twist-lock PDUs, the SMT750R2X122 is the physically appropriate unit.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | APC by Schneider Electric SMT750R2X122 | APC by Schneider Electric SMT750CUS |
|---|---|---|
| Load Capacity (VA) | 750 VA | 750 VA |
| Load Capacity (W) | 500 W | 500 W |
| UPS Technology | — | Line interactive |
| Form Factor | 2U Rackmount | Tower / Desktop |
| Input Plug | NEMA L5-15P (twist-lock) | NEMA 5-15P (standard) |
| Output Receptacles | 6 × NEMA 5-15P | 6 × NEMA 5-15R |
| Input Voltage | 120 V | AC 120 V (range: 82–144 V) |
| Run Time — Full Load | 5 min | 4.5 min |
| Run Time — Half Load | 16 min | 16 min |
| Battery Recharge Time | 3 hours | 3 hours |
| Transfer Time | — | 6 ms |
| Output Waveform | — | Sinewave |
| Surge Energy Rating | — | 540 J |
| Management Interfaces | — | USB, Ethernet (SmartConnect) |
| SmartSlot Expansion | — | 1 slot |
| Efficiency (peak) | — | 98.9% at 100% load |
| Compliance Certifications | — | UL 1449, UL 1778, CSA, FCC Part 15 B, RoHS, REACH |
| Warranty | — | 3-yr limited (2-yr battery) |
| Battery Chemistry | Lead Acid | Lead Acid (sealed, maintenance-free) |
| Weight | — | 30.91 lbs |
Frequently Asked Questions
Which should you choose: the SMT750R2X122 or the SMT750CUS?
The SMT750CUS is the stronger choice when management capability, certified compliance, and documented efficiency matter to the buying decision. It specifies Ethernet and USB management with a SmartSlot expansion bay, pure sinewave output, 540-joule surge protection, 97.2–98.9% efficiency across load ranges, and UL 1449/UL 1778/RoHS/REACH certifications — none of which appear in the SMT750R2X122 spec sheet. The SMT750R2X122 is the correct selection when the installation requires a 2U rack-mount form factor or a NEMA L5-15P twist-lock input circuit, and it edges the SMT750CUS by 0.5 minutes at full-load runtime (5 min vs. 4.5 min). For IT closets and server rooms already wired to standard NEMA 5-15 circuits, the SMT750CUS delivers a materially richer management and compliance profile; for rack deployments with twist-lock PDUs, the SMT750R2X122 is the physically appropriate unit.
Can I plug the SMT750R2X122 into a standard wall outlet?
No. The SMT750R2X122 uses a NEMA L5-15P twist-lock input plug, which requires a matching NEMA L5-15R receptacle. A standard NEMA 5-15R outlet will not accept it without an adapter. The SMT750CUS uses a standard NEMA 5-15P input and connects directly to a common wall outlet.
Does either UPS support remote network management?
Only the SMT750CUS specifies remote management interfaces — USB and Ethernet (SmartConnect) — plus one SmartSlot expansion bay. The SMT750R2X122 spec sheet does not list any management interfaces, so this capability cannot be confirmed for that model from the provided data.
Which unit will keep equipment running longer during a power outage?
At full load (750VA / 500W), the SMT750R2X122 is specified at 5 minutes versus 4.5 minutes for the SMT750CUS — a 0.5-minute difference. At half load, both units are specified at 16 minutes. Recharge time is 3 hours for both. Neither unit specifies an extended-battery module compatibility in the provided specs.
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