APC Smart-ups Ultra Li-ion 8KVA 208V RM UPS with 1 of 5KVA Step Down Transformer - SRTL8KRM4UT-5KTF

APC by Schneider Electric SRTL8KRM4UT-5KTF Smart-UPS Ultra Li-Ion 8KVA 208V 4U Rack UPS with 5KVA Step-Down Transformer

The SRTL8KRM4UT-5KTF is APC's Smart-UPS Ultra Online lithium-ion UPS delivering 8KVA at 208V in a 4U rack-mount chassis, bundled with an integrated 5KVA step-down transformer — a combination purpose-built for data center and server room deployments where 208V utility power must feed mixed 120V and 208V loads without a separate transformer unit consuming additional rack space.

Overview

The Smart-UPS Ultra line represents APC's lithium-ion generation of online double-conversion UPS hardware. Lithium-ion chemistry matters here in ways that directly affect total cost of ownership: li-ion batteries carry a significantly longer service life than traditional VRLA lead-acid — typically three to four times — and require fewer planned replacement cycles over the life of a facility contract. For a rack-deployed 8KVA unit in a production environment, that translates to fewer maintenance windows and lower battery replacement labor costs over a 10-year horizon. The inclusion of the 5KVA step-down transformer (the -5KTF suffix) in the SRTL8KRM4UT-5KTF means 120V-rated servers, storage arrays, or network gear can connect directly without a standalone PDU transformer — consolidating two rack units into one managed power path.

Key Features

• 8KVA / 208V Output: Sized for mid-tier server rack deployments. 8KVA gives headroom above typical 5–6KW rack loads, keeping the UPS out of the thermal throttle zone during demand spikes.
• Lithium-Ion Battery Technology: Li-ion cells extend battery service intervals compared to lead-acid alternatives, reducing planned downtime for battery replacement — a direct operational benefit in 24/7 production racks.
• Integrated 5KVA Step-Down Transformer: Converts 208V input to 120V output for mixed-voltage load environments. Eliminates a separate transformer unit, preserving rack space and simplifying the power chain.
• 4U Rack-Mount Form Factor: Fits standard 19-inch equipment racks. At 4U, it occupies a predictable footprint in rack capacity planning — budget four rack units in your design drawings.
• Online Double-Conversion Topology: As a Smart-UPS Ultra Online product, the unit continuously regenerates clean AC output from the inverter, isolating connected loads from input voltage anomalies, frequency drift, and switching transients — not just outages.
• APC Smart-UPS Ultra Platform: Part of the APC Smart-UPS Ultra line, which supports network management card options for SNMP/web monitoring, integration with PowerChute Network Shutdown, and compatibility with EcoStruxure IT for centralized rack-mount UPS fleet visibility.

Integration and Compatibility

The SRTL8KRM4UT-5KTF is designed for rack environments running 208V single-phase input — common in North American data centers and dedicated server rooms fed from 208V PDU branches. The step-down transformer output supports 120V loads, making it suitable for mixed-voltage deployments where 120V server PSUs, KVM switches, or storage devices share the same rack as 208V equipment. For UPS sizing and selection, match your total connected load (in watts, not VA) against the unit's watt rating with a 20–25% headroom buffer to avoid efficiency degradation under sustained high load. Consult APC's PowerChute or EcoStruxure tools for runtime estimation at your specific load profile. For larger multi-rack environments or three-phase input requirements, review higher-capacity models in APC's Smart-UPS and Symmetra product families.

Frequently Asked Questions

Q: What is the difference between the SRTL8KRM4UT-5KTF and a standard SRTL8KRM4UT?

A: The -5KTF suffix denotes the inclusion of a 5KVA step-down transformer. This allows the UPS to supply 120V output to connected loads from a 208V input feed — the base SRTL8KRM4UT outputs 208V only. If your rack includes 120V-rated equipment on a 208V circuit, the -5KTF variant eliminates the need for a separate step-down transformer.

Q: Why does this UPS use lithium-ion instead of lead-acid batteries?

A: Lithium-ion offers a longer usable service life and lower weight compared to VRLA lead-acid at equivalent capacity. For a rack-deployed unit like the SRTL8KRM4UT-5KTF, that means fewer battery replacement cycles over the product's service life and reduced maintenance burden in production environments.

Q: What input voltage does the SRTL8KRM4UT-5KTF require?

A: Based on the product designation, this unit is rated for 208V input — standard for North American data center and server room environments fed from 208V single-phase branch circuits. Verify your facility's available input voltage before specifying.

Q: Is the SRTL8KRM4UT-5KTF compatible with APC PowerChute Network Shutdown?

A: The Smart-UPS Ultra platform supports APC network management cards and PowerChute Network Shutdown when the appropriate network management card is installed. Confirm the specific card model required for this unit with APC's compatibility matrix.

Q: How much rack space does the SRTL8KRM4UT-5KTF require?

A: The 4U designation in the model number indicates a 4-rack-unit chassis height in a standard 19-inch rack — plan for 4U of rack space in your capacity layout.

Ted Perry

The SRTL8KRM4UT-5KTF is one of the more practical configurations in APC's Smart-UPS Ultra lineup specifically because the integrated 5KVA step-down transformer collapses what is often a two-device power chain — UPS plus standalone transformer — into a single 4U unit. That matters when you're designing a rack with mixed 208V and 120V load requirements and every rack unit counts.

Technical Highlights:

• Li-Ion Battery Platform: Lithium-ion chemistry delivers a materially longer service life than VRLA lead-acid at equivalent capacity — fewer planned replacement events over a typical 7–10 year facility contract.
• 8KVA at 208V: Provides appropriate headroom for mid-density server racks. Sizing at 8KVA supports typical 5–6KW production loads while keeping the unit operating in an efficient load range rather than near its thermal ceiling.
• Integrated 5KVA Step-Down: The -5KTF transformer option (often searched as SRTL8KRM4UT 5KTF) is the reason to choose this SKU over the base model — it directly addresses the 120V equipment problem on 208V circuits without requiring a secondary transformer PDU.

Deployment Considerations:

• Verify your rack's available input circuit is 208V single-phase before ordering — this unit is not designed for 120V input feeds or three-phase environments without appropriate upstream conditioning.
• Network management card installation is required to enable SNMP monitoring, PowerChute integration, or EcoStruxure IT connectivity — confirm the correct card SKU for your management infrastructure before commissioning.

This configuration is the right specification for server rooms and colocation cage deployments where a 208V branch circuit is the available feed and the connected rack includes a mix of 120V servers or storage gear that cannot accept 208V directly.