APC by Schneider Electric SRTL3KRM1UNC 3kVA Online Rack UPS

Overview

The APC by Schneider Electric SRTL3KRM1UNC is a 3kVA (2880W) double-conversion online UPS in a 1U rack form factor — built for server rooms, network closets, and rack-mount UPS installations where consistent, conditioned power is non-negotiable. Unlike standby or line-interactive designs, double-conversion topology means your connected equipment runs entirely off inverter-supplied power at all times. Utility power never touches your load directly — you get zero transfer time during an outage, hardware-grade voltage regulation, and pure sine wave output regardless of what arrives on the input side. This is the architecture that belongs in front of servers, storage arrays, network switches, and NVR systems where even a 4ms transfer window is unacceptable.

The SRTL in the model number designates lithium-ion battery chemistry — a meaningful upgrade over VRLA/AGM designs in long-lifecycle rack environments. Lithium-ion batteries tolerate more charge cycles, operate effectively across wider temperature ranges, and support a smaller physical footprint at equivalent capacity. For IT rooms where UPS units run continuously for years between planned replacements, that translates to lower total cost of ownership.

Key Features

• Double-Conversion (Online) Topology: The load runs off the inverter 100% of the time, so there is literally zero transfer time during a utility failure — no relay switching, no 4ms or 8ms gap. For servers mid-write or NVRs mid-record, this is the only architecture that guarantees continuity. UPS power protection at this tier is appropriate for any equipment where a brief outage causes data corruption or system crash.
• 3kVA / 2880W Output Capacity: At 96% power factor (2880W from 3000VA), this UPS handles real-world mixed IT loads more cleanly than older 0.8 power factor designs. Size your actual load to 80% of rated wattage (approximately 2,300W) for comfortable headroom and optimal battery runtime during outages.
• Pure Sine Wave Output: Active PFC power supplies — standard in modern servers and network hardware — require true sine wave input. Square wave or simulated sine wave output from cheaper standby units trips PFC supplies into fault mode. The SRTL3KRM1UNC delivers clean sine wave continuously, so server PSUs behave exactly as they would on utility power.
• 93% Efficiency: Double-conversion UPS designs traditionally sacrifice efficiency for protection. At 93%, this unit recovers much of that loss — meaningful when a 3kVA load runs 24/7. Lower heat output also reduces cooling load in the rack and extends component lifespan.
• NEMA L5-30P Input / 6x NEMA L5-30R Outlets: The twist-lock L5-30 connector standard is the correct choice for rack PDU and high-density server connections — locking engagement prevents accidental disconnection. Six L5-30R receptacles let you distribute load across servers, storage, and network gear without a downstream PDU for most small deployments.
• USB Type-A Communication Port: Enables direct connection to a host system for graceful shutdown management via APC PowerChute or compatible UPS management software. During extended outages, the UPS can signal the operating system to save state and shut down cleanly before battery depletion — critical for databases and VM hosts.
• 1U Rack Form Factor: Fits a standard 19-inch rack and consumes only 1U of rack space — efficient in dense environments where every rack unit costs real estate. Pair with a managed PoE switch in the same rack for a self-contained edge deployment.
• 50/60 Hz Compatibility: Accepts both 50 Hz and 60 Hz input, making this unit field-deployable across North American installations without frequency matching concerns. Output is regulated at 50/60 Hz regardless of input variation.
• Audible Alarm: On-battery, low-battery, and overload conditions trigger audible alerts — no separate monitoring software required for basic status awareness in a data closet or server room without continuous remote monitoring configured.
• 55 dB Noise Level: Comparable to a quiet office environment. Acceptable for installations in network closets adjacent to occupied spaces — though for open office or library deployments, verify ambient noise tolerance before rack placement.

Integration & Compatibility

The SRTL3KRM1UNC integrates with APC PowerChute Network Shutdown and PowerChute Business Edition for graceful multi-server shutdown orchestration. The USB Type-A port provides direct host connection for single-server or NAS setups. For multi-server environments, a network management card (sold separately, fits the UPS expansion slot in the SRTL family) enables IP-based monitoring, SNMP traps, and remote management via APC EcoStruxure. The pure sine wave output and active load management make it compatible with all major server brands and active PFC power supplies. Consult your rack PDU documentation to confirm L5-30R to PDU inlet compatibility before ordering — some high-density PDUs use C19/C20 or C13/C14 connectors requiring an adapter or different input cord.

For network video recorders and surveillance infrastructure, double-conversion protection is the recommended topology for any NVR storing footage to spinning or SSD media — a hard cutover during write can corrupt the filesystem or active recordings. The 2880W capacity comfortably supports a mid-density NVR, multiple PoE switches, and an edge server on a single UPS circuit. For larger surveillance racks, evaluate runtime at actual load rather than rated kVA — battery runtime curves vary significantly with lithium-ion at different charge states and temperatures.

Consult the UPS selection guide to size correctly for your load and required runtime before specifying this unit on a project drawing.

Frequently Asked Questions

Q: What is the difference between the SRTL3KRM1UNC and a standard SRT3000RMXLUS or similar VRLA-battery APC model?

A: The