APC Smart-ups Ultra on Line Srtl 5KVA Tower Isolation/step-down Transformer - SRTL5KTF

APC by Schneider Electric SRTL5KTF Isolation/Step-Down Transformer for Smart-UPS Ultra On-Line

Overview

The SRTL5KTF is a 5KVA tower-format isolation and step-down transformer designed as a companion unit for the APC Smart-UPS Ultra On-Line SRTL series. If your facility runs a 208V or 240V distribution infrastructure but your protected loads — workstations, monitors, access control hardware, PoE switches, NVRs, and other 120V devices — need standard North American outlet configurations, this transformer bridges that gap in a single raceable (rack-kit sold separately) or freestanding chassis. The unit accepts a single NEMA L6-30P input on a 3 ft (0.91 m) pigtail and delivers output across 12 mixed receptacles covering 120V, 208V, and 240V simultaneously, so you can consolidate mixed-voltage loads on one transformer rather than wiring separate circuits for each voltage tier.

The APC by Schneider Electric SRTL transformer line is purpose-engineered to pair with the Smart-UPS Ultra On-Line topology, where the UPS itself outputs higher-voltage power that downstream 120V equipment cannot consume directly. Rather than specifying separate PDUs and voltage converters, a single SRTL5KTF resolves the mismatch cleanly at 5KVA capacity.

Key Features

• 208V / 240V Dual-Voltage Input: Accepts either L6-30P-terminated 208V or 240V input, which means the same transformer unit covers both common North American three-phase panel tap scenarios — 208V from a wye distribution or 240V from a delta or split-phase panel. You don't need to specify two SKUs for different facility voltages.
• Triple Output Voltage — 120V, 208V, and 240V Simultaneously: The 12-outlet receptacle array covers (8) NEMA 5-20R at 120V, (2) NEMA L6-20R at 208V, (1) NEMA L6-30R at 208V/240V, and (1) NEMA L14-30R at 120V/208V. This mixed array lets a single transformer feed standard 120V IT and security gear alongside 208V rack PDUs or high-draw computing hardware — critical in a mixed surveillance/server closet or IDF room.
• Isolation Transformer Design: The galvanic isolation between input and output sides eliminates common-mode noise and ground loops — a genuine operational benefit in environments where security cameras, access control panels, and IP intercoms share infrastructure with heavy motor loads or HVAC equipment on the same electrical system. Ground loops are a documented cause of hum artifacts in analog video and erratic behavior in serial RS-485 access control buses.
• 5KVA Capacity for Real Workloads: 5KVA at unity power factor means up to 5,000W of resistive load, with realistic IT load capacity in the 3,500–4,000W range depending on load power factor. That's sufficient headroom for a mid-size surveillance rack — an NVR, PoE switch stack, a workstation, and several 120V auxiliary circuits — without running the transformer near its thermal limits.
• NEMA L6-30P Input Connector on 3 ft Pigtail: The fixed 3 ft (0.91 m) input cord terminates in an L6-30P twist-lock plug, which mates directly to the output receptacle on APC Smart-UPS Ultra On-Line units in this power class. No adapter or custom whip needed — the connection between the UPS output and transformer input is a single plug-in operation.
• Tower Form Factor with Rack-Mount Option: As shipped, the SRTL5KTF stands as a tower unit. The mounting preference is noted as rack-mountable with a kit, which means it can be integrated into a standard 19-inch equipment rack if your deployment uses rack infrastructure — useful in IDFs, server rooms, or integrated security headend racks where floor space is premium.
• 125 lb (56.7 kg) Chassis — Plan Your Installation Accordingly: At 125 lb, this transformer requires two-person installation and appropriate floor or rack load planning. Rack shelves and floor tiles both have weight ratings — the SRTL5KTF at 56.7 kg will exceed a standard raised-floor tile's point-load spec if concentrated on a small footprint. Position it on a solid floor section or verify your rack's weight capacity before mounting.
• Wide Environmental Operating Range: The unit is rated for operating altitudes up to 10,000 ft, which covers high-elevation data centers and mountain-region facilities. Relative humidity tolerance of 0–95% non-condensing handles humid server rooms and coastal deployments. Storage ratings extend to 50,000 ft altitude and 5–113°F ambient, so the unit ships and warehouses without special climate controls.

Integration & Compatibility

The SRTL5KTF is designed as a downstream transformer for UPS and power protection systems operating in the APC Smart-UPS Ultra On-Line SRTL series. The L6-30P input plug directly mates with SRTL-series UPS output receptacles in this power class, creating a clean UPS-to-transformer-to-load chain without intermediate adapters.

For integrators specifying a complete power infrastructure for a surveillance or IT deployment, the SRTL5KTF addresses the scenario where a facility's available circuit is 208V or 240V (common in commercial buildings served by three-phase distribution) but the majority of connected equipment — IP cameras, NVRs, PoE switches, workstations — runs on 120V NEMA 5-20R. The eight 5-20R outlets support standard PoE switches and 1U/2U rack gear directly, while the two L6-20R and one L6-30R outlets serve higher-voltage loads or rack PDUs in mixed environments.

There is no built-in bypass, battery, or power conditioning circuitry in this unit — it is a transformer only. It must be paired with an upstream UPS for runtime protection. Plan wiring accordingly: the 3 ft input cord limits how far the transformer can be placed from its UPS source without an extension whip.

Frequently Asked Questions

Q: What input voltages does the SRTL5KTF accept?

A: The SRTL5KTF accepts 208V or 240V input via a NEMA L6-30P twist-lock connector on a 3 ft (0.91 m) fixed input cord.

Q: What output voltages and receptacle types does the SRTL5KTF provide?

A: The SRTL5KTF delivers output across 12 receptacles: (8) NEMA 5-20R at 120V, (2) NEMA L6-20R at 208V, (1) NEMA L6-30R, and (1) NEMA L14-30R — covering 120V, 208V, and 240V simultaneously.

Q: Does the SRTL5KTF include a built-in UPS or battery backup?

A: No. The SRTL5KTF is a transformer-only unit with no internal battery, bypass, or conditioning circuitry. It must be used with an upstream APC Smart-UPS Ultra On-Line unit for runtime protection.

Q: Can the SRTL5KTF be rack-mounted?

A: Yes, with a rack-mount kit (sold separately). As shipped, it is a tower unit. At 125 lb (56.7 kg), verify your rack's weight capacity before mounting.

Q: What is the operating altitude limit for the SRTL5KTF?

A: The SRTL5KTF is rated for operating altitudes up to 10,000 ft, covering the majority of commercial facility deployments including high-elevation sites.

Q: What are the SRTL5KTF's ambient humidity and temperature storage limits?

A: Storage temperature range is 5°F to 113°F (-15°C to 45°C) with 0–95% relative humidity non-condensing, and storage altitude up to 50,000 ft — no special climate-controlled warehousing required.

Karl Wilson

The SRTL5KTF solves a real-world wiring problem I see repeatedly in commercial security and IT headend buildouts: a facility has 208V or 240V available at the panel, the UPS is sized for that voltage, but the downstream load is almost entirely 120V NEMA 5-20R equipment — cameras, NVRs, switches, workstations. Without this transformer in the chain, you're either specifying a different UPS topology or running separate 120V circuits from a different panel, both of which add cost and complexity. The SRTL5KTF's 12-outlet mixed array handles the translation cleanly at 5KVA.

Technical Highlights:

• Mixed 12-Outlet Array: Eight NEMA 5-20R outlets cover the bulk of 120V IT and security loads; the two L6-20R and single L6-30R outlets handle 208V rack PDUs or high-draw computing gear — all from one transformer, one circuit tap.
• Galvanic Isolation: The isolation barrier between input and output eliminates ground loops and common-mode noise — practically important when IP cameras and RS-485 access control buses share the same electrical infrastructure as HVAC or motor loads, where ground potential differences cause real signal problems.
• Dual Input Voltage Acceptance (208V / 240V): Specifying one SKU for both 208V wye-fed and 240V delta-fed deployments simplifies procurement for multi-site projects where panel configurations vary by building.

Deployment Considerations:

• At 125 lb (56.7 kg), the SRTL5KTF requires two-person placement and a floor or rack section rated for that point load — raised-floor tiles in older data centers often cap at 250–500 lb distributed load, but point loading under a 56 kg chassis on a small footprint can exceed tile ratings. Verify before positioning.
• The 3 ft (0.91 m) fixed input cord means the transformer must sit within arm's reach of its upstream UPS output receptacle — it is not designed for remote placement on a long whip. Factor cable management into rack layout planning.

This unit is the right call for a commercial building security headend or IDF room where the available circuit is 208V or 240V, the UPS is an APC Smart-UPS Ultra On-Line SRTL-series, and the downstream load mix is predominantly standard 120V IT equipment. It is not a standalone power conditioner — pair it with the appropriate SRTL UPS and size your circuit breaker for the full 5KVA draw.