Vertiv PSI5-1500RT120N 1500VA Line-Interactive Rack/Tower UPS with RDU120 Network Card
Overview
The Vertiv Liebert PSI5-1500RT120N is a 1500VA / 1350W line-interactive UPS designed for server rooms, network closets, security head-end equipment, and edge deployments where a clean, uninterrupted power supply is non-negotiable. At 0.9 power factor — meaning it converts 1350W of real load from that 1500VA rating — this unit delivers more usable wattage than the typical 0.6–0.7 PF units that pad their VA figures. Pure sinewave output protects sensitive electronics that reject modified sinewave power: network switches, NVRs, IP PBXs, medical devices, and POS systems all fall into this category. The PSI5-1500RT120N ships with an RDU120 network management card installed, enabling remote monitoring and control without requiring a separate Intellislot upgrade purchase.
Fitting into a standard 2U rack footprint (3.5 in H × 17.2 in W × 20.1 in D), the PSI5-1500RT120N also converts to tower orientation for standalone deployments — a genuine flexibility benefit in mixed environments where not every installation site has a rack. The unit weighs 42.8 lb, so plan for two people or a proper rail kit during rack installation.
Key Features
- Pure Sinewave Output: Unlike stepped approximations, true sinewave power is required by active PFC power supplies found in most modern servers, NVRs, and network equipment. Running active-PFC gear on modified sinewave UPS units causes efficiency losses, premature component wear, and transfer trip failures — this unit eliminates that risk entirely.
- Automatic Voltage Regulation (AVR): The input accepts a wide 75–146VAC range and corrects it to configurable output (100/110/115/125VAC) without drawing on battery. In facilities with chronic undervoltage or overvoltage — common in older buildings, remote sites, and areas served by unreliable utility feeds — AVR extends battery life significantly by avoiding unnecessary discharge cycles.
- 0.9 Power Factor / 1350W Real Output: The PSI5-1500RT120N delivers 1350W against its 1500VA rating, a 0.9 PF that competes with higher-tier units. If you're loading 1,100W of real equipment, you have legitimate headroom — not paper headroom that evaporates under actual load.
- Hot-Swappable User-Replaceable Battery: Batteries can be swapped under load without shutting down connected equipment. In 24/7 environments — surveillance head-ends, security operations centers, always-on NVR stacks — planned maintenance windows for battery replacement are often impossible. Hot-swap eliminates the downtime.
- Six 5-15R Outlet Bank with Programmable Control: Six NEMA 5-15R outlets provide load flexibility; programmable outlet control lets administrators sequence shutdown or cycling of individual loads — useful for staged restart of NVRs, switches, and servers after a power event to avoid simultaneous inrush.
- RDU120 Network Management Card Included: Remote monitoring, alerting, and shutdown scripting via the included RDU120 card — no add-on purchase required. Connect to your SNMP management infrastructure or use Vertiv's management software for event logs, battery health, and load reporting. USB management port also available for local access.
- Up to 96% Efficiency / Energy Star 2.0 Certified: At 96% efficiency, the PSI5-1500RT120N generates less heat and draws less utility power than lower-efficiency alternatives — meaningful in high-density racks where BTU budgets are already tight and energy costs compound at scale.
- Emergency Power Off (EPO): Hardwired EPO input allows integration with facility-level emergency shutdown systems. Required in many data center and server room code installations; having it built in avoids external relay workarounds.
- Line-Interactive Topology: Line-interactive units correct voltage without switching to battery for minor fluctuations, preserving battery capacity for actual outages. For security and network environments with multiple daily voltage sags, this topology dramatically extends cycle life versus standby/offline designs.
Integration and Compatibility
The PSI5-1500RT120N is built around the Liebert PSI5 platform and integrates with Vertiv's Environet Alert and Trellis management software via the included RDU120 card. The Intellislot bay also accepts optional communication cards for expanded connectivity. USB management port supports direct PC connection for configuration and monitoring without network infrastructure.
Input connector is a standard NEMA 5-15P — plug-and-play with standard 15A branch circuits. Output is six NEMA 5-15R receptacles, compatible with the power cords already on most rack equipment. No special wiring or dedicated circuits required beyond the standard 120VAC / 15A outlet already present in most IT closets.
Standards compliance includes UL 1778, c-UL-us Listed, and FCC Part 15 Class B — the Class B rating matters for deployments in environments sensitive to conducted emissions (medical, broadcast, or dense office environments). For additional context on sizing a UPS for your security or network rack, review the power protection category resources. The Liebert PSI5 sits within the broader Vertiv power protection lineup, which spans from entry-level to enterprise three-phase systems.
When deploying multiple UPS units in a security head-end or server room, pairing the PSI5-1500RT120N with a managed PoE switch on a separate UPS circuit ensures camera feeds remain live even during a controlled UPS maintenance cycle. For full rack power distribution planning, see the PDU category for downstream distribution options.
Frequently Asked Questions
Q: Does the PSI5-1500RT120N include a network management card, or is that a separate purchase?
A: The RDU120 network management card is included with the PSI5-1500RT120N. No additional Intellislot card purchase is needed for SNMP/network-based monitoring and remote shutdown control.
Q: What is the warranty on the PSI5-1500RT120N?
A: Vertiv provides a two-year full unit warranty including the battery, with next-day advanced replacement service. Battery coverage is included in the base warranty period, which is unusual for UPS products at this capacity.
Q: Can the PSI5-1500RT120N power active-PFC server and NVR power supplies?
A: Yes. The pure sinewave output is fully compatible with active power factor correction (active-PFC) power supplies. Modified sinewave UPS units can cause operational issues with active-PFC equipment; the PSI5-1500RT120N eliminates that concern.
Q: Can the battery be replaced without shutting down connected equipment?
A: Yes. The PSI5-1500RT120N uses a hot-swappable, user-replaceable battery design. Battery replacement can be performed under load without powering down connected devices — critical for 24/7 surveillance and network environments.
Q: What input voltage range does the PSI5-1500RT120N accept?
A: The unit accepts 75–146VAC input and uses automatic voltage regulation (AVR) to correct the output to 120VAC (configurable to 100/110/115/125VAC) without switching to battery for voltage fluctuations within that range.
Q: Is the PSI5-1500RT120N rack-mountable, and what is its rack height?
A: Yes. The PSI5-1500RT120N installs in a standard 2U rack space (3.5 in H × 17.2 in W × 20.1 in D) and also converts to tower orientation for floor or shelf deployments. Unit weight is 42.8 lb — two-person installation is recommended.
The spec I keep coming back to on the PSI5-1500RT120N is the 0.9 power factor. Most competing 1500VA units in this price tier operate at 0.6–0.7 PF, which means a stated 1500VA might only deliver 900–1050W of real power under full load. At 0.9 PF, this Liebert unit delivers 1350W — a meaningful difference when you're stacking an NVR, a managed PoE switch, and a few ancillary devices and need to know your actual runtime calculations are valid.
Technical Highlights:
- Pure Sinewave at 96% Efficiency: Running at up to 96% efficiency means less heat dissipated into the rack environment and lower utility draw — in a 10-UPS deployment that difference adds up across a year of 24/7 operation.
- AVR Range 75–146VAC: That 71V input swing handled entirely by AVR — not battery — is one of the widest in the class. Facilities with chronic low voltage (a common issue in older commercial buildings) will see battery cycle counts stay low because the AVR absorbs those sags without discharging.
- RDU120 Card Included: Having the network management card already installed means you're SNMP-ready out of the box. Deploying 10 of these in a distributed security infrastructure? You're managing all of them remotely from day one, no per-unit card purchases required.
Deployment Considerations:
- At 42.8 lb, rack installation is a two-person job — don't overlook slide rail compatibility with your specific rack depth (20.1 in deep, so verify clearance in shallower 4-post or 2-post racks before ordering).
- The six outlets are all NEMA 5-15R, which means maximum 15A per outlet under typical branch circuit protection — if any single device draws close to that, dedicate a separate circuit rather than daisy-chaining through a PDU on this UPS output.
The PSI5-1500RT120N is the right call for a physical security head-end rack — NVR, managed PoE switch, access control server, and intercoms all on one unit — where pure sinewave is required, runtime calculations need to be trustworthy, and you need to manage battery health remotely without scheduling on-site visits.
