APC Smart-ups On-line 6000 Watts /6000 VA Input 208V /output 208V Extended Runt - SRT6KXLT

APC by Schneider Electric SRT6KXLT 6000VA Online Double-Conversion Tower UPS

Overview

The APC SRT6KXLT is a 6000VA / 6000W online double-conversion uninterruptible power supply designed for 208V single-phase environments where true power isolation — not just switching — is the requirement. Unlike line-interactive or standby topologies, double-conversion architecture regenerates output power continuously from the inverter, meaning utility noise, voltage swings, and frequency fluctuations never reach your connected equipment. For power protection in data closets, server rooms, and mission-critical security infrastructure, that distinction matters more than the VA rating.

The SRT6KXLT ships in a tower configuration with an included rack-conversion kit, making it deployable in either orientation without additional hardware. It draws power via a hard-wire 3-wire (2PH + G) input connection rated for 208V or 240V single-phase at 40–70 Hz — auto-sensing, so you don't need to configure frequency manually. Output is likewise hard-wired, with a unity power factor (6000W = 6000VA) meaning you're not leaving capacity on the floor with mixed inductive loads.

Key Features

• True Online Double-Conversion Topology: The inverter is always in the signal path — there is no transfer time to battery during a sag or outage. For security servers, NVRs, or access control panels where even a 4ms gap triggers a reboot, this is the topology that eliminates that failure mode entirely. Line-interactive UPS units transfer in 2–12ms; this one transfers in 0ms.
• 6000W Unity Power Factor: A 1.0 power factor (6000VA = 6000W) means every VA of capacity delivers a full watt to the load. Rack-dense environments with switching power supplies — the kind common in video surveillance server rooms — don't derate this unit the way they would a 0.8 PF model. You get the full 6000W, not 4800W.
• Embedded Network Management Card 3 (NMC3): The NMC3 is preinstalled — not a slot add-on you have to budget separately. It provides SNMP, web interface, and environmental monitoring out of the box, so you can integrate the SRT6KXLT into your NMS or DCIM tooling from day one. One free expansion slot remains for a second management card or dry-contact I/O module if your deployment requires it.
• Extendable Runtime Architecture: The SRT6KXLT is designed to accept external battery packs (APCRBC140 replacement battery confirmed), making runtime a variable you can engineer rather than accept. The base unit alone won't carry a 6kW load for hours — but paired with external battery modules, it can. This matters for remote sites or facilities where utility restoration takes 30+ minutes.
• Internal Automatic and Manual Bypass: Both bypass modes are built in. Automatic bypass engages if the inverter fails or overloads; manual bypass lets you service or replace the unit under load without dropping power to connected equipment. In a 24/7 security operations center, that's not a luxury — it's a maintenance requirement.
• Less Than 2% Total Harmonic Distortion (THD): Sub-2% output THD protects sensitive electronics from the harmonic noise that degrades power supplies over time and can cause erratic behavior in industrial control equipment. If your load includes servers with gold-rated PSUs or precision timing equipment, this is the spec that justifies the cost delta over cheaper alternatives.
• 480J Surge Energy Rating: The 480-joule surge rating handles transient events that a standard surge strip cannot absorb. Combined with the double-conversion isolation, connected equipment never sees the raw utility waveform at all — the surge rating is a backstop for the rare case when the inverter itself needs protection.
• 1.5-Hour Recharge Time: After a full discharge, the SRT6KXLT recovers to operational charge in approximately 90 minutes at 579W charging power. In facilities that experience multiple brief outages per day — common near industrial equipment or in regions with unstable utility — fast recharge means the unit is ready for the next event rather than sitting at partial capacity for hours.
• 55 dBA Acoustic Level: At 55 dBA, this unit is audible in a quiet room but not disruptive in a populated server room or wiring closet. If you're deploying in a noise-sensitive environment like a broadcast control room, plan for that accordingly.
• ENERGY STAR V2.0 / UL 1778 Certified: UL 1778 is the North American UPS safety standard — required for many commercial and government facilities. ENERGY STAR V2.0 qualification means the unit meets efficiency benchmarks that reduce operating cost over multi-year deployments. Both certifications are evidence-grounded for this SKU.

Integration and Compatibility

The SRT6KXLT connects via hard-wire 3-wire input (2PH + G), requiring a dedicated circuit — this is not a NEMA plug-and-play unit. Plan for licensed electrical work if you're adding this to an existing panel. The embedded NMC3 supports standard SNMP MIB integration with most enterprise network management platforms and APC's EcoStruxure IT software. USB and serial ports are both present for local management without network access.

Battery replacement uses the APCRBC140 module. The unit ships with a temperature probe, USB cable, installation guide, user manual, and warranty card — the environmental monitoring probe connects directly to the NMC3 for ambient temperature alerting without additional hardware. The 192V battery string and 579W charge rate support fast recovery; battery life is rated at 3–5 years under normal operating conditions.

The SRT6KXLT is part of the APC Smart-UPS On-Line family. For deployments requiring higher power capacity, the same product line scales above 6kW with compatible external battery cabinet architecture. For smaller loads or standard 120V environments, consider the lower-VA models in the Smart-UPS On-Line range rather than underloading this unit below its efficient operating range. Pairing with a compatible server rack enclosure and a managed PoE switch rounds out a complete protected infrastructure stack for surveillance or access control deployments.

What's in the Box

• 1x SRT6KXLT UPS unit
• 1x CD with software
• 1x Documentation CD
• 1x Installation guide
• 1x Removable support feet
• 1x Temperature probe
• 1x User manual
• 1x USB cable
• 1x Warranty card
• 1x Web/SNMP Management Card (NMC3, preinstalled)

Frequently Asked Questions

Q: What is the topology of the SRT6KXLT — is it truly online double-conversion?

A: Yes. The SRT6KXLT uses a true online double-conversion topology, meaning the inverter is always in the power path. There is zero transfer time to battery during an outage or voltage event — connected equipment never sees the raw utility waveform.

Q: What input voltage and connection type does the SRT6KXLT require?

A: The SRT6KXLT requires a hard-wire 3-wire (2PH + G) input connection rated for 208V or 240V single-phase. It is not a NEMA plug-in unit — dedicated circuit installation by a licensed electrician is required.

Q: Does the SRT6KXLT include a network management card, or is that a separate purchase?

A: The NMC3 (Network Management Card 3 with environmental monitoring) is preinstalled at the factory. One additional expansion slot remains open for a second card if needed.

Q: Can the runtime be extended beyond the base battery pack?

A: Yes. The SRT6KXLT is designed to accept external battery modules for extended runtime. The replacement battery is the APCRBC140. Base runtime depends on load; at full 6000W load, runtime will be limited — external packs are the correct solution for extended holdover requirements.

Q: What certifications does the SRT6KXLT carry?

A: The SRT6KXLT is certified to ENERGY STAR V2.0, FCC Part 15 Class A, NOM, and UL 1778 — the North American UPS safety standard. These are verified certifications for this SKU.

Q: What is the acoustic output, and is it suitable for office-adjacent installations?

A: The SRT6KXLT is rated at 55 dBA. It is suitable for a dedicated server room or wiring closet. In quiet open-office or noise-sensitive environments, acoustic isolation or a separate equipment room is recommended.

Eden Phillips

When I specify the SRT6KXLT for a project, the first thing I point to is the unity power factor — 6000VA equaling 6000W is a specification that directly affects how you size this unit against your actual load. Too many integrators size by VA and end up with a derated unit when the load is dominated by switching power supplies. With the SRT6KXLT, what you see is what you get: 6000W available, full stop.

Technical Highlights:

• Online Double-Conversion at 6kW: Zero transfer time eliminates the reboot events that plague line-interactive installs in facilities with frequent sags. At 6000W with a 1.0 PF load, the inverter is continuously regenerating a clean 208V sine wave — utility browndowns, frequency drift, and impulse events are absorbed upstream.
• Embedded NMC3 with Environmental Probe: The preinstalled NMC3 plus the included temperature probe means you can set up threshold alerts for ambient temperature in the enclosure from day one — no procurement delay, no slot consumed. The one remaining expansion slot gives you a growth path for dry-contact or a second management interface.
• 1.5-Hour Recharge at 579W: The 90-minute recharge rate is meaningful on sites where utility quality is poor and you might see two events in a workday. A slow-charging UPS at partial state-of-charge going into the second event is a real failure scenario; 579W charging power keeps the recovery window short.

Deployment Considerations:

• Hard-wire input (2PH + G) means this unit requires a dedicated 208V or 240V circuit — confirm panel capacity and schedule licensed electrical work before delivery. Do not assume a wall outlet path.
• At 134.99 lb (61.23 kg) and 55 dBA, plan your physical placement carefully. Tower orientation works in a wiring closet; if rackmounting, the included kit handles that, but you'll want a two-person lift and confirm your rack's weight rating before sliding this in.

The SRT6KXLT is the right call for a mid-size security operations center or a dense camera-server room running 208V infrastructure where you need managed, monitorable, zero-transfer power protection in a single self-contained unit — and where a future runtime extension path matters more than minimizing upfront cost.