Vertiv PSI5-1100MT120 1100VA/990W Line-Interactive Mini Tower UPS
Overview
The Vertiv PSI5-1100MT120 is a 1,100 VA / 990 W line-interactive UPS in a compact mini tower form factor, designed for small server rooms, edge deployments, and surveillance head-end equipment where clean, regulated power is non-negotiable. At up to 97% efficiency in Normal Mode, it draws minimal overhead on your utility bill even running 24/7 — an important factor when stacking multiple UPS units in a security operations room. The built-in Automatic Voltage Regulation (AVR) topology keeps connected equipment online through sags and swells across a wide 75–146VAC input window, stepping in with battery power only when conditions fall outside that range — extending battery service life compared with double-conversion designs that cycle the battery on every minor disturbance.
For integrators specifying power protection alongside Vertiv power infrastructure or planning a complete UPS and power protection deployment, the PSI5-1100MT120 (often searched as PSI5 1100MT120) occupies the sweet spot between desktop-grade strip protection and rack-mounted enterprise UPS.
Key Features
- 1,100 VA / 990 W Power Capacity: Enough headroom to carry a compact NVR, managed PoE switch, and ancillary networking gear simultaneously. Size to 80% load for runtime margin — that puts your practical ceiling around 792 W of connected load before runtime begins to compress.
- Up to 97% Efficiency in Normal Mode: Line-interactive topology running near-unity efficiency means the PSI5-1100MT120 generates very little heat and adds minimal load to your facility circuits. In a closet with limited airflow, this matters more than the spec sheet implies.
- Wide Input Range (75–146VAC): AVR steps up or down within this window without touching the battery. In buildings with known voltage instability — older facilities, construction-adjacent sites, or rural installations — this range catches most brownouts and swells that would otherwise age your connected equipment prematurely.
- User-Configurable Output Voltage (100/110/115/125VAC): Lets you tune the output to match sensitive equipment tolerances or local standards without rewiring. Useful when integrating international equipment or when downstream devices specify a tighter input window than nominal 120VAC.
- 5 × NEMA 5-15R Output Receptacles: Five individually accessible outlets on a 5-15P input plug — no IEC adapters needed in standard North American deployments. Layout the load across outlets with attention to which are battery-backed vs. surge-only if applicable to your configuration.
- LCD Control Panel: Front-panel display gives real-time UPS status — load level, battery state, input/output voltage — without requiring a laptop or SNMP connection. Useful during commissioning and for quick field checks.
- Flexible Communications Options: USB and RJ-45 ports are onboard. Optional UNITY communications cards (IS-UNITY-SNMP or IS-UNITY-DP) add SNMP and web management for remote monitoring via your NMS. EPO terminals support emergency power-off integration with building management or data center control systems.
- Out-of-Band Serial Management: Serial connection for management independent of the primary network — critical when a network event is the cause of the outage you're trying to diagnose.
- Operating Temperature +32 to +104 °F (0–40 °C): Covers standard conditioned space deployments. Not rated for uncontrolled outdoor enclosures or unconditioned attic installations — factor this into site surveys for remote edge locations.
- Compliance: UL 1778, ANSI C62.41 Cat A Level 3, RoHS2, REACH: UL 1778 is the North American safety standard for UPS equipment. ANSI C62.41 Category A Level 3 reflects surge immunity testing at the branch-circuit level. RoHS2 and REACH compliance matter for enterprise procurement teams with environmental reporting requirements.
Integration & Compatibility
The PSI5-1100MT120 integrates with network management platforms via optional UNITY SNMP cards, enabling trap-based alerting and SNMP polling from tools like SolarWinds, PRTG, or Nagios. The USB interface supports UPS-to-server communication for graceful shutdown sequencing — pair it with the Vertiv Intelligent Power Transfer (IPT) software or compatible open-source agents. EPO terminal integration connects to building emergency stop systems, a common requirement in data center and campus security head-end builds. For broader power protection planning, consider pairing this unit with a dedicated surge protection device on the utility feed side for layered transient suppression beyond what the internal AVR provides.
Frequently Asked Questions
Q: What is the input plug and output receptacle configuration on the PSI5-1100MT120?
A: The PSI5-1100MT120 uses a NEMA 5-15P input plug and provides five NEMA 5-15R output receptacles — standard North American 15A configuration. No adapters required for typical US deployments.
Q: Does the PSI5-1100MT120 include an SNMP card, or is that sold separately?
A: SNMP capability requires an optional communications card — either the IS-UNITY-SNMP or IS-UNITY-DP — sold separately. The base unit includes USB and RJ-45 interfaces onboard, along with EPO terminals.
Q: What is the input voltage range the PSI5-1100MT120 can handle before switching to battery?
A: The AVR topology accepts input from 75 to 146VAC without engaging the battery. Outside that window, the unit transfers to battery. Nominal input is 120VAC.
Q: Can I configure the output voltage on the PSI5-1100MT120?
A: Yes. Output voltage is user-configurable among 100, 110, 115, and 125VAC via the onboard LCD control panel, allowing you to match downstream equipment tolerances without rewiring.
Q: What certifications does the PSI5-1100MT120 carry?
A: The unit is listed to UL 1778 (North American UPS safety standard), ANSI C62.41 Category A Level 3 (surge immunity), RoHS2, and REACH.
Q: Is the PSI5-1100MT120 rack-mountable?
A: The PSI5-1100MT120 ships in a mini tower form factor. Rack conversion options may be available separately — consult Vertiv accessories for compatible rail kits if rack integration is required.
The PSI5-1100MT120's 97% Normal Mode efficiency is the spec I keep coming back to when specifying this unit for edge surveillance closets — at 990 W capacity running near-continuously, you're dissipating very little heat compared with older ferro-resonant or double-conversion alternatives of similar capacity. That thermal advantage is real in a locked IDF closet with passive ventilation.
Technical Highlights:
- 97% Efficiency (Normal Mode): Minimizes heat output and facility power draw in 24/7 operation — meaningful when multiple UPS units share a small, lightly cooled space.
- 75–146VAC AVR Input Window: Catches a wide band of voltage disturbances without cycling the battery, extending battery service intervals in electrically noisy environments like industrial facilities or older commercial buildings.
- Optional UNITY SNMP/DP Cards: Add IS-UNITY-SNMP or IS-UNITY-DP to pull this unit into your NMS with full SNMP trap and web management — the base unit ships without this capability, so budget for it if remote monitoring is a requirement.
Deployment Considerations:
- Size connected load to 80% of the 990 W rating (~792 W practical ceiling) to maintain meaningful runtime margin; an NVR, PoE switch, and fiber media converter typically land well within that envelope.
- The mini tower form factor weighs 26 lb — plan for shelf or floor placement in the closet; rack mounting requires a separate conversion kit not included in the base SKU.
The PSI5-1100MT120 is well-matched to compact surveillance head-end builds: a single NVR, one managed PoE switch, and a network appliance sit comfortably inside the 990 W envelope, and the wide AVR input range handles the voltage irregularities common in warehouse and light-industrial sites without prematurely aging the battery.
