APC by Schneider Electric SMX1500RMI2U vs APC by Schneider Electric BR1500MS2: Specification Comparison
Both units are 1500 VA line-interactive sine-wave UPS systems from APC by Schneider Electric, making them directly cross-shoppable at the same VA class. The SMX1500RMI2U is a rack-mount Smart-UPS targeting IT infrastructure — servers, switches, routers — while the BR1500MS2 is a tower Back-UPS Pro positioned toward workstations and gaming rigs. The comparison examines power capacity and output, runtime and recharge characteristics, and form factor plus connectivity, since those three axes drive purchase decisions in this UPS category.
In This Guide
- Which unit delivers more usable power and better surge protection?
- How quickly does each unit recharge its battery, and what runtime can be expected?
- What are the differences in form factor, output receptacles, and management connectivity?
- Which should you choose: the SMX1500RMI2U or the BR1500MS2?
- Side-by-Side Specs
- FAQ
Which unit delivers more usable power and better surge protection?
The SMX1500RMI2U is rated at 1200 W (1500 VA) at 230 V AC, while the BR1500MS2 is rated at 900 W (1500 VA) at 120 V AC. Despite identical VA ratings, the SMX1500RMI2U provides 33% more real wattage output — a critical distinction when powering high-draw servers or active networking gear. The SMX1500RMI2U's harmonic distortion is specified at less than 5%, and its input voltage range is stated as 160–286 V adjustable. The BR1500MS2 operates on a 120 V / 60 Hz grid (North American standard) with an input range of 88–147 V and a maximum input current of 12 A.
On surge protection, the BR1500MS2 carries a 1080 J surge energy rating versus 645 J for the SMX1500RMI2U — a 67% advantage in joule rating. Both units specify full-time multi-pole noise filtering with 5% IEEE surge let-through and zero clamping response time. The BR1500MS2 additionally provides coaxial cable (CATV/SATV/modem/audio-video) data line protection, which the SMX1500RMI2U does not list. The SMX1500RMI2U meets UL 1449; the BR1500MS2 does not specify this standard in the provided data.
How quickly does each unit recharge its battery, and what runtime can be expected?
The SMX1500RMI2U lists a typical recharge time of 3 hours with a battery charging power of 103 W rated, using a sealed lead-acid battery (replacement: APCRBC115). Runtime is not provided as a discrete figure in the supplied specifications; APC references a runtime graph. Battery life for both units is identically specified at 3–5 years.
The BR1500MS2 lists a typical recharge time of 16 hours — more than five times longer than the SMX1500RMI2U — with a battery charge power of only 16 W rated. This is a significant operational difference: after a power event, the BR1500MS2 requires the better part of a working day to return to full charge capacity, whereas the SMX1500RMI2U recovers within a standard work break. No discrete runtime figure is provided for the BR1500MS2 either. Both units include 1 RBC (replaceable battery cartridge).
What are the differences in form factor, output receptacles, and management connectivity?
The SMX1500RMI2U is a 2U rack-mount unit (89 mm height) with rack mounting hardware and removable support feet included, weighing 24.82 kg. It targets data center and network closet environments. Output receptacles are 8 × IEC 320 C13 plus 2 IEC jumpers (230 V). Management connectivity includes a serial port, USB port, and one available expansion slot — plus a Smart UPS signalling RS-232 cable and USB cable in the box. It supports remote or expanded monitoring via the expansion slot.
The BR1500MS2 is a desktop tower unit, 26 cm in one dimension, weighing 12.5 kg — roughly half the weight and not rack-mountable. Output receptacles are 6 × NEMA 5-15R (battery-backed) plus 4 × NEMA 5-15R (surge-only), all 120 V North American standard. Connectivity is USB only; no serial port or expansion slot is specified. The included accessories are a coaxial cable, USB cable, and user manual. The BR1500MS2 also specifies an 8 ms typical / 10 ms maximum transfer time; the SMX1500RMI2U does not list a transfer time in the provided data.
Operating altitude differs: the SMX1500RMI2U is rated to 10,000 ft (0–3,048 m), while the BR1500MS2 is rated to only 3,000 ft (0–914 m). Acoustic output is 40 dBA for the SMX1500RMI2U versus 45 dBA for the BR1500MS2. Heat dissipation for the SMX1500RMI2U is specified at 133 BTU/h; this figure is not provided for the BR1500MS2. The SMX1500RMI2U carries CE, CSA, EAC, RCM, and UK PSTI certifications; the BR1500MS2 certifications are not listed in the provided specifications.
Which should you choose: the SMX1500RMI2U or the BR1500MS2?
Our take: The SMX1500RMI2U is the stronger choice when protecting rack-mounted IT infrastructure in a data center or network closet environment. It delivers 1200 W of real power versus the BR1500MS2's 900 W — a 300 W (33%) advantage that directly translates to more connected load capacity. Its battery recharges in 3 hours versus the BR1500MS2's 16 hours, making it far more resilient across multiple power events in a single day. Its operating altitude ceiling of 10,000 ft versus the BR1500MS2's 3,000 ft also widens deployment options. Conversely, the BR1500MS2 is purpose-built for 120 V North American desktop or workstation use, offers a higher 1080 J surge rating (versus 645 J), includes coaxial data line protection, and is lighter and less expensive to deploy where rack space is unavailable. Buyers needing 230 V rack infrastructure protection with management expansion capability should select the SMX1500RMI2U; buyers powering a North American workstation or AV setup should consider the BR1500MS2.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | APC by Schneider Electric SMX1500RMI2U | APC by Schneider Electric BR1500MS2 |
|---|---|---|
| Rated Power (VA) | 1500 VA | 1500 VA |
| Rated Power (W) | 1200 W | 900 W |
| UPS Topology | Line Interactive | Line Interactive |
| Waveform | Sine wave | Sine wave |
| Input Voltage | 230 V AC, 1-phase | 120 V AC |
| Input Connection | IEC 320 C14 | NEMA 5-15P |
| Output Receptacles | 8 × IEC 320 C13 + 2 IEC jumpers | 6 × NEMA 5-15R (battery) + 4 × NEMA 5-15R (surge) |
| Surge Energy Rating | 645 J | 1080 J |
| Transfer Time | — | 8 ms typical / 10 ms maximum |
| Typical Recharge Time | 3 h | 16 h |
| Battery Charge Power | 103 W rated | 16 W rated |
| Battery Design Life | 3–5 years | 3–5 years |
| Management Connectivity | Serial port + USB + expansion slot | USB only |
| Form Factor | 2U rack-mount (89 mm) | Desktop tower (26 cm) |
| Weight | 24.82 kg | 12.5 kg |
| Operating Altitude | 0–10,000 ft | 0–3,000 ft |
| Acoustic Level | 40 dBA | 45 dBA |
Frequently Asked Questions
Which should you choose: the SMX1500RMI2U or the BR1500MS2?
The SMX1500RMI2U is the stronger choice when protecting rack-mounted IT infrastructure in a data center or network closet environment. It delivers 1200 W of real power versus the BR1500MS2's 900 W — a 300 W (33%) advantage that directly translates to more connected load capacity. Its battery recharges in 3 hours versus the BR1500MS2's 16 hours, making it far more resilient across multiple power events in a single day. Its operating altitude ceiling of 10,000 ft versus the BR1500MS2's 3,000 ft also widens deployment options. Conversely, the BR1500MS2 is purpose-built for 120 V North American desktop or workstation use, offers a higher 1080 J surge rating (versus 645 J), includes coaxial data line protection, and is lighter and less expensive to deploy where rack space is unavailable. Buyers needing 230 V rack infrastructure protection with management expansion capability should select the SMX1500RMI2U; buyers powering a North American workstation or AV setup should consider the BR1500MS2.
Is the SMX1500RMI2U or BR1500MS2 better for protecting servers in a rack cabinet?
The SMX1500RMI2U is purpose-built for rack deployment — it ships as a 2U rack-mount unit with mounting rails, outputs 1200 W at 230 V across 8 × IEC 320 C13 receptacles, and includes a serial port plus an expansion slot for enhanced network management. The BR1500MS2 is a desktop tower with NEMA 5-15R outlets and USB-only connectivity, and is not rack-mountable per the provided specifications.
How long does each UPS take to recharge after a power outage?
The SMX1500RMI2U specifies a typical recharge time of 3 hours (103 W charge power). The BR1500MS2 specifies a typical recharge time of 16 hours (16 W charge power). If your site experiences multiple power interruptions in a day, the SMX1500RMI2U returns to full protection significantly faster.
Which unit offers better surge protection — the SMX1500RMI2U or the BR1500MS2?
On joule rating alone, the BR1500MS2 is rated at 1080 J versus the SMX1500RMI2U's 645 J. The BR1500MS2 also includes coaxial cable surge protection for CATV/SATV/modem/audio-video lines, which the SMX1500RMI2U does not list. Both units specify full-time multi-pole noise filtering with 5% IEEE surge let-through and zero clamping response time. Note that the SMX1500RMI2U references UL 1449 compliance; this is not stated for the BR1500MS2 in the provided data.
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