Vertiv PSI5-1000RM1201U 1000VA/900W 1U Line-Interactive Rack UPS
Overview
The Vertiv Liebert PSI5-1000RM1201U is a 1000VA/900W line-interactive UPS built for 1U rack environments where power quality and compact footprint both matter. Designed around a true line-interactive topology with automatic voltage regulation (AVR), it conditions incoming power continuously — not just during outages — making it a practical fit for NVR stacks, PoE switch closets, access control servers, and other always-on security infrastructure. At 1.7 inches tall and 20.1 inches deep, PSI5-1000RM1201U fits standard 2-post and 4-post racks without eating into valuable rack units. The unit ships ready for NEMA 5-15 environments, with five 5-15R output receptacles covering mixed device loads typical in mid-size security closets.
Browse the full Vertiv UPS and power protection line to see where the PSI5 family fits within Vertiv's rack power portfolio.
Key Features
- 1000VA / 900W Line-Interactive AVR: The line-interactive topology with AVR corrects under- and over-voltage conditions (the input window spans 75–146VAC) without switching to battery — so battery runtime is preserved for actual outages rather than wasted on routine sags and surges common in older buildings or shared circuits.
- Up to 98% Efficiency in Normal Mode: At 98% efficiency, heat output and operating cost stay low even in 24/7 environments. For a rack running continuously, that translates to minimal heat added to the cabinet — meaningful when you're already managing thermal load from cameras, switches, and NVRs.
- User-Configurable Output Voltage (100/110/115/125VAC): Output voltage is selectable at the unit — useful when equipment connected has specific input requirements or when replacing a UPS in a circuit that was previously set for a non-standard nominal. Most installers won't need this, but it prevents a service call when it does come up.
- Five 5-15R Output Receptacles: Five outlets on a single 1U device lets you distribute power across an NVR, a managed PoE switch, a rack-mount access control panel, and spare capacity for future devices — without a separate PDU in most small-to-mid closet builds.
- LCD Status Display: The front-panel LCD shows UPS status, load level, battery condition, and input/output voltage at a glance. For installations where someone needs to check UPS health without pulling up SNMP dashboards, this removes the guesswork during rounds or service calls.
- SNMP and Web Management via Optional UNITY Card: The IS-UNITY-SNMP or IS-UNITY-DP card (sold separately) adds full SNMP and web-based monitoring — letting you integrate the UPS into existing NMS platforms, set threshold alerts, and pull runtime estimates remotely. USB and EPO terminals are included standard for basic monitoring and emergency power-off wiring.
- Wide Input Voltage Range (75–146VAC): The 75VAC low-end threshold handles brownout conditions well below what most UPS units tolerate before switching to battery. In facility environments with generator startup cycles or heavily loaded circuits, this range keeps the unit on line-conditioned power longer.
- UL 1778 Listed, ANSI C62.41 Cat A Level 3, RoHS2 and REACH: UL 1778 listing confirms the unit meets North American safety standards for UPS equipment. ANSI C62.41 Category A, Level 3 surge rating addresses the surge environments found in commercial and light industrial electrical systems. RoHS2 and REACH compliance matters for deployments with environmental procurement requirements.
Integration and Compatibility
The PSI5-1000RM1201U is compatible with the Vertiv rack UPS ecosystem and accepts the IS-UNITY-SNMP or IS-UNITY-DP communications cards for integration with SNMP-based network management systems. The standard USB interface supports communication with most modern operating systems and VMS platforms for graceful shutdown signaling. The EPO (Emergency Power Off) terminal block supports integration with facility-level EPO circuits — a requirement in some data center and server closet builds. Output voltage is user-configurable to 100, 110, 115, or 125VAC, providing flexibility for mixed-voltage equipment inventories. For deeper UPS monitoring and alerting alongside managed network switches and NVRs, pairing with the optional UNITY SNMP card is the recommended path.
At 36.4 lb and 20.1 inches deep, confirm rack depth clearance before ordering — shallow wall-mount enclosures common in smaller installations may not accommodate the depth. The 5-15P input plug limits deployment to standard 15A circuits; this is not a unit for 20A-only power strips or 5-20R receptacle panels without an adapter.
Frequently Asked Questions
Q: What is the input plug type and output receptacle configuration on the PSI5-1000RM1201U?
A: The PSI5-1000RM1201U uses a NEMA 5-15P input plug (standard 15A, 120VAC) and provides five NEMA 5-15R output receptacles, covering most NVRs, switches, and access control equipment running on standard 120VAC circuits.
Q: Does the PSI5-1000RM1201U include SNMP monitoring built in?
A: SNMP and web management are not included by default. They require the optional IS-UNITY-SNMP or IS-UNITY-DP communications card (sold separately). USB connectivity and EPO terminal support are included standard.
Q: What input voltage range does the PSI5-1000RM1201U support before switching to battery?
A: The unit's AVR accepts input from 75VAC to 146VAC while remaining on conditioned utility power. Only voltages outside this range trigger battery operation, preserving battery life during common sags and swells.
Q: Can the output voltage on the PSI5-1000RM1201U be adjusted?
A: Yes. Output voltage is user-configurable to 100, 110, 115, or 125VAC via the front-panel LCD, providing flexibility for equipment with specific nominal input requirements.
Q: What is the rack space requirement for the PSI5-1000RM1201U?
A: The PSI5-1000RM1201U occupies 1U of rack space (1.7 inches tall, 17.2 inches wide, 20.1 inches deep). Verify available rack depth before installation — the 20.1-inch depth may not fit shallow wall-mount enclosures.
Q: What certifications does the PSI5-1000RM1201U carry?
A: The unit is UL 1778 listed, ANSI C62.41 Category A Level 3 surge rated, and compliant with RoHS2 and REACH environmental directives.
The PSI5-1000RM1201U sits in a specific sweet spot I see regularly in mid-size security rack builds: you need real AVR line conditioning — not just surge suppression — but you can't give up more than 1U to get it. Vertiv's 98% normal-mode efficiency rating is the number I'd point to first here, because at 1000VA continuous in a 24/7 NVR-plus-switch rack, that efficiency difference versus a 90%-class unit isn't trivial when you're also trying to stay under a thermal threshold in a climate-controlled closet.
Technical Highlights:
- 75–146VAC Input Window: That's an unusually wide range for a 1U unit at this power level. In practice, it means the unit stays on conditioned utility power through the kind of brownouts that force lesser UPS units onto battery — which matters when you're protecting an NVR mid-write during a recording cycle.
- Five 5-15R Outlets: Five individually accessible receptacles on a 1U frame means a typical NVR + managed PoE switch + access panel load is covered without a separate outlet strip — simplifying the wiring audit trail and reducing one more failure point in the cabinet.
- Optional UNITY SNMP Card: The IS-UNITY-SNMP slot is the path to integrating PSI5-1000RM1201U into Vertiv's centralized monitoring or your existing NMS. If this rack is in an unmanned IDF or remote security closet, budget the card in from the start — USB-only monitoring means someone has to be physically present to catch a degraded battery before it becomes an incident.
Deployment Considerations:
- At 20.1 inches deep and 36.4 lb, verify your rack's usable depth and rail weight rating before ordering — wall-mount enclosures under 24 inches depth won't fit this unit, and lighter-duty open-frame racks may need reinforcement at that weight on a single shelf.
- The 5-15P input is hard-coded for 15A circuits. If your rack PDU or wall circuit is 5-20R only, you'll need a verified adapter or a circuit swap — don't assume a plug adapter is code-compliant in a commercial installation without checking with your electrical contractor.
This unit is a natural fit for an NVR-anchor rack in a retail loss-prevention or small campus security closet: the 1U profile keeps the camera and switch density high, AVR handles the power quality issues common in retail strip centers, and the UNITY card slot gives you the monitoring path needed when the closet is unattended most of the day.
