APC by Schneider Electric SMT750R2X122 750VA 2U Rackmount UPS with LCD

Overview

The APC Smart-UPS SMT750R2X122 is a 750VA / 500W 2U rackmount uninterruptible power supply built for IT closets, network racks, and security infrastructure deployments where stable, conditioned power isn't optional. With a NEMA L5-15P locking input plug and six NEMA 5-15P output receptacles, it fits standard 120V branch circuits common in server rooms and wiring closets without requiring a dedicated power run. If you're protecting a surveillance NVR stack, a PoE switch array, or edge-compute nodes that can't tolerate a dirty transfer, this is an uninterruptible power supply designed to hold load through typical utility disturbances and deliver a clean switchover when they can't be ridden out.

The LCD front panel gives you real-time visibility into load percentage, estimated runtime, battery condition, and input/output voltage — useful during commissioning and for routine checks without needing a laptop or management software open. For APC by Schneider Electric Smart-UPS deployments already managed via PowerChute or a network management card, the SMT750R2X122 fits the same ecosystem without added complexity.

Key Features

• 750VA / 500W Capacity: Sized for a single NVR plus associated switching gear, or a small cluster of access control panels and edge devices. At 500W true power, you have headroom for realistic IT loads without paying for capacity you won't use in a single-rack security closet.
• 5-Minute Full-Load / 16-Minute Half-Load Runtime: At full 500W draw, you get roughly five minutes — enough to execute a controlled shutdown sequence or ride out most utility blips. Run your protected load at 250W and that window extends to 16 minutes, which covers most localized outages and gives generators time to stabilize.
• NEMA L5-15P Locking Input: The twist-lock plug prevents accidental disconnection in rack environments where cable management is dense and technicians work close to live circuits. Pairs with standard L5-15R receptacles on rack PDUs and branch circuit outlets in commercial wiring.
• Six NEMA 5-15P Output Receptacles: Six standard outlets cover an NVR, a managed PoE switch, a firewall, and still leave capacity for an access control head-end or a secondary device. No outlet adapters required for typical 120V equipment.
• 2U Rackmount Form Factor: At 3.3" H × 17" W × 26.3" D, it occupies two rack units in a standard 19-inch enclosure. Plan for 26.3 inches of depth — shallower telecom racks or wall-mount enclosures under 24 inches won't accommodate it without a shelf extension.
• 3-Hour Battery Recharge: After a deep discharge, the lead-acid battery pack returns to full capacity in approximately three hours. For sites with frequent outage events, that recharge window matters — a UPS that hasn't recovered between events is effectively offline.
• Circuit Breaker Protection: Resettable circuit breaker rather than sacrificial fuses means a downstream overload or short doesn't require a service call to restore protection. Push to reset and you're back in service.
• 50/60 Hz Input Frequency: Accepts either frequency, which simplifies procurement for mixed-standard environments and future-proofs the unit if the site's power infrastructure changes.
• LCD Status Display: Real-time load, runtime estimate, battery health, and input/output voltage on a front-panel LCD — you can assess UPS health at a glance during a rack walk without connecting to a management interface.

Integration & Compatibility

The SMT750R2X122 belongs to the APC Smart-UPS line, which supports optional network management cards (sold separately) for SNMP-based remote monitoring, integration with building management systems, and automated shutdown signaling to connected servers and NVRs. PowerChute software compatibility allows scheduled self-tests, runtime calibration, and graceful OS-level shutdown sequencing — relevant for Windows-based VMS servers that need an orderly shutdown rather than a hard power cut. The locking L5-15P input integrates cleanly with rack power distribution units that provide L5-15R receptacles, a common configuration in structured rack deployments. For surveillance-specific planning, pair this with a network video recorder sized within the 500W output ceiling to ensure the UPS holds the full recording stack through a power event.

Frequently Asked Questions

Q: What is the runtime of the SMT750R2X122 at full load versus half load?

A: At full 500W load, the SMT750R2X122 provides approximately 5 minutes of runtime. At half load (250W), runtime extends to approximately 16 minutes. Actual runtime varies based on battery age and condition.

Q: What input plug type does the SMT750R2X122 use, and what circuit does it require?

A: The SMT750R2X122 uses a NEMA L5-15P twist-lock plug, which connects to a standard 120V / 15A branch circuit with an L5-15R receptacle. This is common in commercial wiring closets and server rooms.

Q: How many outlets does the SMT750R2X122 provide, and what type are they?

A: It provides six NEMA 5-15P output receptacles — standard three-prong 120V outlets compatible with most IT and security equipment without adapters.

Q: How deep is the SMT750R2X122, and will it fit in a shallow wall-mount rack?

A: The SMT750R2X122 is 26.3 inches deep. Standard 19-inch wall-mount enclosures under 24 inches of usable depth will not accommodate it. Verify your enclosure's interior depth before ordering.

Q: How long does the SMT750R2X122 battery take to recharge after a full discharge?

A: The lead-acid battery pack recharges to full capacity in approximately 3 hours following a full discharge.

Q: Can the SMT750R2X122 be managed remotely?

A: The SMT750R2X122 is compatible with APC network management cards (sold separately) that enable SNMP-based remote monitoring and PowerChute software for automated graceful shutdown. The NMC slots into the UPS accessory bay — confirm card compatibility with APC before purchasing.

Jerry Tildsen

The SMT750R2X122 is the unit I reach for when a customer needs rackmount power protection in a 2U footprint and their branch circuit is already wired with an L5-15P receptacle — the twist-lock input is the differentiator here versus the standard SMT750 variants, and it matters in rack environments where cable tension or technician traffic could pull a straight-blade plug free during a critical recording window.

Technical Highlights:

• 500W True Power Output: The 750VA rating with a 500W real power ceiling means you're working with a 0.67 power factor — plan your connected load against the 500W figure, not the VA. A typical 4-channel PoE NVR drawing 80W plus a 24-port PoE switch at 150W leaves you comfortable headroom without approaching the protection threshold.
• 16-Minute Half-Load Runtime: At 250W draw — realistic for a compact NVR plus switching gear — you get a 16-minute window. That's enough for a generator to stabilize and transfer, or for a graceful VMS shutdown sequence to complete without forcing a hard power cut on active recordings.
• 3-Hour Recharge Cycle: Lead-acid chemistry at this capacity tier is predictable, but the 3-hour recharge window means a site with back-to-back utility events inside that window goes into a second event with a partially depleted battery. Worth flagging to the end user so they don't assume full protection has restored immediately after the first outage clears.

Deployment Considerations:

• At 26.3 inches deep, verify your rack or enclosure's interior depth before shipping. Wall-mount enclosures rated for 24 inches of depth won't seat this unit — a 31-inch or deeper floor-standing rack is the safe choice.
• If you intend to add a network management card for remote SNMP monitoring or PowerChute integration, confirm NMC compatibility with APC before procurement — not all Smart-UPS NMC slots accept every card generation, and the SMT750R2X122's accessory bay spec should be cross-referenced against the card's compatibility list.

This unit fits best in a compact security closet deployment: an NVR, a managed PoE switch feeding 8–16 cameras, and an access control head-end all on a single 15A L5-15P circuit — the SMT750R2X122 covers that stack cleanly and keeps recording continuity through the utility events that make those sites most vulnerable.