Vertiv PSI5-750MT120 750VA/675W Line-Interactive Mini Tower UPS
Overview
The Vertiv PSI5-750MT120 is a 750VA/675W line-interactive UPS in a compact mini tower form factor, built for small server rooms, edge networking closets, and surveillance equipment racks where reliable power conditioning matters as much as battery backup. At 97% efficiency in normal mode, it draws less heat and wastes less energy than most comparable units in its class — a real factor if you're running it continuously alongside NVRs or PoE switches. The PSI5-750MT120 ships with five NEMA 5-15R outlets, a 5-15P input plug, and an LCD front panel that makes initial setup and status monitoring straightforward without a management card. If you need SNMP or web-based monitoring, the optional IS-UNITY-SNMP or IS-UNITY-DP cards slot in without replacing the unit. This makes the PSI5 750MT120 (often searched as PSI5 750MT120) a reasonable platform to grow into deeper infrastructure management rather than forcing an immediate card commitment at purchase.
Key Features
- 750VA / 675W Power Rating: The 675W true watt output — not just VA — is the number that determines what you can actually run. A rack with a mid-range NVR drawing 50W, two PoE switches at 80W each, and a workstation at 150W lands around 360W; the PSI5-750MT120 handles that load with runtime headroom to spare. Don't confuse VA with watts when sizing battery backup.
- Line-Interactive AVR Topology: Automatic Voltage Regulation (AVR) corrects brownouts and overvoltages — input range 75–146VAC — without touching battery reserves. In environments where voltage sags are frequent (shared commercial electrical service, older buildings), this extends battery life significantly compared to standby UPS designs that switch to battery on every sag.
- 97% Normal-Mode Efficiency: Running near full efficiency means less heat dissipated inside the enclosure and lower electricity overhead. Over a year of 24/7 operation, the difference between an 85% and 97% efficient UPS on a 300W load is measurable in electricity cost and cooling load.
- User-Configurable Output Voltage: Output can be set to 100, 110, 115, or 125VAC, which matters when the downstream equipment has tight input tolerances or when facility electrical specs vary. Most competing units in this class lock output at a single voltage.
- 5x NEMA 5-15R Outlets: Five protected outlets on a single UPS lets you consolidate an NVR, a PoE switch, a router, and a workstation without a separate PDU for the UPS circuit. Standard NEMA 5-15P input connects directly to any grounded 15A wall outlet — no hardwiring or electrician required.
- LCD Status Display: The front-panel LCD shows UPS status, load level, and battery condition at a glance, reducing the time spent pulling cables or logging into a management interface for routine checks. Useful during initial commissioning and during incidents.
- Optional UNITY Communications Cards (IS-UNITY-SNMP / IS-UNITY-DP): SNMP and web management are available via optional cards rather than built-in, which keeps base cost down for installations that don't need remote monitoring. USB and RJ-45 interfaces are included standard for local management and serial out-of-band access. EPO (Emergency Power Off) terminals are available for integration with facility shutdown systems.
- UL 1778 Listed, RoHS2 and REACH Compliant: UL 1778 is the North American UPS safety standard — relevant for insurance, data center compliance, and installations where AHJ sign-off is required. RoHS2 and REACH compliance matters for customers with EU environmental procurement requirements or sustainability reporting obligations.
- ANSI C62.41 Category A, Level 3 Surge Protection: Category A covers the most common surge exposure environments (branch circuits in commercial buildings). Level 3 indicates tested to the highest energy level in that category — relevant for sites near high-demand electrical equipment or in regions with frequent lightning activity.
Integration and Compatibility
The PSI5-750MT120 integrates with network management environments via the optional IS-UNITY-SNMP card, enabling standard SNMP traps and web-based monitoring compatible with most NMS platforms. USB connectivity supports direct connection to Windows, Linux, and macOS hosts for local shutdown management. The RJ-45 interface provides serial out-of-band access. EPO terminals allow wiring into facility emergency shutdown circuits — required in some data center and server room compliance frameworks. The configurable output voltage (100/110/115/125VAC) allows pairing with international equipment running on North American circuits. For Vertiv's full power protection portfolio, including higher-capacity rack-mount UPS units and extended battery modules, check the Vertiv brand page.
This unit fits naturally alongside network equipment in edge deployments: a small PoE switch, an NVR, and a gateway can all draw from the five 5-15R outlets without needing an intermediate PDU. For larger surveillance infrastructure with higher wattage requirements, review the UPS systems category for rack-mount options with higher VA ratings. Planners integrating UPS selection into a broader deployment should consult the power protection planning resources for load-sizing guidance. If you're pairing this UPS with PoE infrastructure, see the PoE switches section for compatible switch options within the same power budget.
Frequently Asked Questions
Q: What is the true watt output of the PSI5-750MT120, and how does it differ from the VA rating?
A: The PSI5-750MT120 is rated at 750VA and 675W. The watt figure is what determines actual load capacity — use 675W as your sizing ceiling when adding up equipment draw, not the 750VA figure.
Q: What input voltage range does the PSI5-750MT120 support, and does AVR engage during brownouts?
A: The unit accepts input from 75 to 146VAC (nominal 120VAC). The line-interactive AVR topology corrects voltages within this range without switching to battery, so brownouts and overvoltages are handled without consuming battery runtime.
Q: Does the PSI5-750MT120 include SNMP management built-in, or is it optional?
A: SNMP and web management require an optional IS-UNITY-SNMP or IS-UNITY-DP communications card (sold separately). USB, RJ-45, and EPO terminal interfaces are included with the base unit and support local and serial out-of-band management without the optional card.
Q: Can the output voltage be adjusted on the PSI5-750MT120?
A: Yes. Output voltage is user-configurable to 100, 110, 115, or 125VAC via the front-panel LCD, allowing the unit to match the input requirements of downstream equipment or local facility standards.
Q: What certifications does the PSI5-750MT120 carry?
A: The PSI5-750MT120 is UL 1778 listed, ANSI C62.41 Category A Level 3 (surge), RoHS2 compliant, and REACH compliant.
Q: How many outlets does the PSI5-750MT120 provide, and what connector type?
A: Five NEMA 5-15R output receptacles. Input is a standard NEMA 5-15P plug, connecting to any grounded 15A North American outlet without special wiring.
The PSI5-750MT120 sits in a specific sweet spot I see often on security deployments: you need more than a cheap consumer UPS but not a full rack-mount unit with dual feeds and remote cards. The 97% normal-mode efficiency is the number I point to first — at 675W true output on a line-interactive platform, this unit generates less heat inside an IDF closet than almost anything else in this power class, which matters when you're stacking a PoE switch, an NVR, and a gateway in a 12U wall-mount rack with minimal airflow.
Technical Highlights:
- 75–146VAC Input Range with AVR: That 71-volt swing below nominal is unusually wide. On commercial circuits that brownout to the 90–95VAC range during peak demand, the AVR corrects on-the-fly and the battery stays fully charged for actual outages — not wasted on sag compensation.
- Configurable Output Voltage (100/110/115/125VAC): Useful on mixed-equipment deployments where some devices ship configured for 110V nominal and others for 120V. Set it once via the LCD and every outlet follows — no individual outlet switching required.
- ANSI C62.41 Cat A Level 3 Surge Rating: Level 3 is the highest tested energy within Category A (branch circuit exposure). For surveillance head-end equipment that routes fiber, coax, and data on the same rack, this matters more than the generic
