APC by Schneider Electric SMT750R2X122 vs APC by Schneider Electric SMT750C: Specification Comparison
Both the SMT750R2X122 and SMT750C are APC Smart-UPS 750VA / 500W line-interactive units running on 120V with lead-acid batteries and six NEMA 5-15R output receptacles. They share the same power tier and UPS topology, making them legitimate cross-shop candidates. The key differentiator is physical form factor: the SMT750R2X122 is a 2U rackmount designed for equipment racks, while the SMT750C is a tower unit intended for desktop or floor placement. Buyers are essentially choosing between rack-integrated deployment and standalone tower placement within the same power class.
In This Guide
- How do runtime, battery specs, and recharge performance compare between these two 750VA units?
- Which unit fits a rack deployment versus a standalone installation, and how do their physical and input/output specs differ?
- What monitoring, communication, and environmental operating capabilities does each unit offer?
- Which should you choose: the SMT750R2X122 or the SMT750C?
- Side-by-Side Specs
- FAQ
How do runtime, battery specs, and recharge performance compare between these two 750VA units?
The SMT750R2X122 provides a specified backup run time of 5 minutes at full load (500W) and 16 minutes at half load (250W). Its battery chemistry is lead acid; no battery voltage, amp-hour rating, or replacement battery part number is listed in the provided specifications.
The SMT750C provides more granular battery data: a 24V lead-acid battery rated at 7.0 Ah, delivering 146 VAh of runtime capacity with 49W of battery charge power. Its replacement battery is the RBC48, and it carries a specified typical recharge time of 3 hours — identical to the SMT750R2X122's 3-hour recharge figure. The SMT750C does not specify run-time minutes at full or half load in the provided specs; those figures are not available for direct comparison.
Buyers who need confirmed runtime figures at specific loads will find the SMT750R2X122's published 5-minute full-load and 16-minute half-load numbers more directly actionable for planning. The SMT750C's 146 VAh and 7.0 Ah ratings allow calculated estimation but require the buyer to derive runtime independently.
Which unit fits a rack deployment versus a standalone installation, and how do their physical and input/output specs differ?
The SMT750R2X122 is explicitly a 2U rackmount unit, measuring 3.3" H × 17" W × 26.3" D. Its input connection is a NEMA L5-15P twist-lock plug, which requires a compatible twist-lock receptacle on the facility circuit — a meaningful infrastructure consideration. Output is six NEMA 5-15R receptacles, suitable for standard equipment power cords.
The SMT750C is not rack-mountable (confirmed by 'Not rack-mountable' and 'Two Post Mountable: 0' in its specs). Its physical footprint is described only by a 6.34" dimension (161mm) in the provided specs; full H×W×D are not listed. It weighs 29.0 lbs and uses a standard NEMA 5-15P input plug with a 6 ft (1.83 m) power cord, and outputs six NEMA 5-15R receptacles. Color is black.
For any rack-mounted equipment environment, the SMT750R2X122 is the purpose-built choice. The SMT750C's tower form suits workstations, point-of-sale stations, or small server rooms where rack space is unavailable or undesirable. Note that the SMT750R2X122's twist-lock input plug necessitates a matching outlet or a pigtail adapter, which the SMT750C's standard plug avoids.
What monitoring, communication, and environmental operating capabilities does each unit offer?
The SMT750C includes a SmartConnect Ethernet port for cloud-based monitoring (availability subject to terms of use), a LED status display with indicators for on-line, on-battery, replace-battery, and overload states, and an audible alarm for on-battery, low-battery, and configurable delay conditions. It also specifies a harmonic distortion of less than 5%, a transfer time of 6ms typical / 10ms maximum, a sine wave output, an acoustic level of 41 dBA, heat dissipation of 90 Btu/h, and an operating altitude of 0–10,000 ft with 0–95% relative humidity.
The SMT750R2X122's provided specifications do not include any communication port details, transfer time, waveform type, acoustic level, heat dissipation, operating altitude, humidity range, or display/alarm descriptions. These parameters are absent from the supplied spec sheet.
For IT environments requiring remote or cloud-based UPS monitoring, the SMT750C's SmartConnect Ethernet port is a concrete, documented feature. The SMT750R2X122 offers no equivalent in the provided specifications, though buyers should consult APC's full datasheet to confirm whether management interfaces exist but were omitted from the spec data supplied here.
Which should you choose: the SMT750R2X122 or the SMT750C?
Our take: The SMT750R2X122 is the stronger choice when the deployment target is a standard 19-inch equipment rack and floor space is at a premium. It occupies a defined 2U slot, has a published 5-minute full-load and 16-minute half-load runtime for concrete planning, and its 26.3" depth accommodates standard rack-mount cabling. By contrast, the SMT750C is the correct selection for non-rack environments: it uses a standard NEMA 5-15P input plug (no twist-lock infrastructure required), adds a SmartConnect Ethernet port for cloud monitoring not documented on the SMT750R2X122, and provides explicit battery specs (24V / 7.0 Ah / RBC48) for lifecycle planning. The SMT750C's 6ms typical transfer time and sine-wave output are confirmed; those parameters are unspecified for the SMT750R2X122. Buyers deploying rack infrastructure favor the SMT750R2X122; buyers deploying workstations or tower-server environments with a monitoring requirement favor the SMT750C.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | APC by Schneider Electric SMT750R2X122 | APC by Schneider Electric SMT750C |
|---|---|---|
| Load Capacity (VA) | 750 VA | 750 VA |
| Load Capacity (W) | 500 W | 500 W |
| UPS Topology | — | Line Interactive |
| Waveform Type | — | Sine wave |
| Form Factor | 2U Rackmount | Tower (not rack-mountable) |
| Input Plug | NEMA L5-15P (twist-lock) | NEMA 5-15P (standard) |
| Output Receptacles | 6 × NEMA 5-15R | 6 × NEMA 5-15R |
| Input Voltage | 120 V | 120 V (110 V / 125 V range) |
| Output Voltage | 120 V | 120 V (110 V / 125 V range) |
| Battery Chemistry | Lead Acid | Lead-acid |
| Battery Voltage / Capacity | — | 24 V / 7.0 Ah / 146 VAh |
| Replacement Battery | — | RBC48 |
| Battery Recharge Time | 3 hours | 3 hours |
| Runtime at Full Load | 5 min | — |
| Runtime at Half Load | 16 min | — |
| Transfer Time | — | 6 ms typical / 10 ms maximum |
| Communication Port | — | SmartConnect Ethernet (cloud monitoring) |
| Acoustic Level | — | 41 dBA |
| Heat Dissipation | — | 90 Btu/h |
| Operating Altitude | — | 0 – 10,000 ft |
| Dimensions (H × W × D) | 3.3" × 17" × 26.3" | 6.34" (one dimension only listed) |
| Weight | — | 29.0 lbs (13.18 kg) |
| Color | — | Black |
| Input Frequency | 50 / 60 Hz | 50 / 60 Hz ±3 Hz (sync to mains) |
Frequently Asked Questions
Which should you choose: the SMT750R2X122 or the SMT750C?
The SMT750R2X122 is the stronger choice when the deployment target is a standard 19-inch equipment rack and floor space is at a premium. It occupies a defined 2U slot, has a published 5-minute full-load and 16-minute half-load runtime for concrete planning, and its 26.3" depth accommodates standard rack-mount cabling. By contrast, the SMT750C is the correct selection for non-rack environments: it uses a standard NEMA 5-15P input plug (no twist-lock infrastructure required), adds a SmartConnect Ethernet port for cloud monitoring not documented on the SMT750R2X122, and provides explicit battery specs (24V / 7.0 Ah / RBC48) for lifecycle planning. The SMT750C's 6ms typical transfer time and sine-wave output are confirmed; those parameters are unspecified for the SMT750R2X122. Buyers deploying rack infrastructure favor the SMT750R2X122; buyers deploying workstations or tower-server environments with a monitoring requirement favor the SMT750C.
Can I mount the SMT750C in a standard equipment rack?
No. The SMT750C specifications explicitly state it is not rack-mountable and list Two Post Mountable as 0. It is a tower unit only. The SMT750R2X122 is the rack-mount variant, occupying 2U in a standard 19-inch rack.
Does the SMT750R2X122 require a special wall outlet?
Yes. The SMT750R2X122 uses a NEMA L5-15P twist-lock input plug, which requires a matching NEMA L5-15R twist-lock receptacle on the facility circuit. The SMT750C uses a standard NEMA 5-15P plug compatible with common 15A outlets.
Which unit supports remote or cloud-based monitoring?
Based on the provided specifications, only the SMT750C documents a SmartConnect Ethernet port for cloud monitoring. No communication port is listed in the SMT750R2X122 specifications; buyers should verify with APC's full datasheet before assuming that unit lacks a management interface entirely.
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