APC by Schneider Electric SRT5KTF Isolation Step-Down Transformer
Overview
The SRT5KTF is a 5KVA tower-form isolation and step-down transformer engineered to pair with the APC Smart-UPS SRT series, extending the system's ability to serve loads that require galvanic isolation or a stepped-down supply voltage. Where standard UPS output feeds equipment directly, an isolation transformer breaks the ground reference between supply and load — a requirement in medical-adjacent deployments, certain industrial control environments, and facilities where ground loops corrupt sensitive analog or control wiring.
The tower chassis measures 130 mm wide × 660 mm deep × 432 mm tall, sized to sit alongside a rack or tower UPS rather than consume a rack unit. The black steel enclosure keeps the unit visually consistent with the Smart-UPS SRT product family. At a shipped weight of 6.35 kg per unit (packaging included), two-person handling is straightforward for most installations.
Key Features
- 5KVA isolation capacity: matches the output tier of the SRT 5K platform — no derating at full UPS load, provided the downstream load power factor is within the transformer's design envelope.
- Operating temperature 0–40°C: covers standard commercial and light-industrial indoor environments. For server rooms with active cooling this is a non-issue; confirm ambient stays below 40°C in dense equipment closets before deploying.
- Operating humidity 0–95% (non-condensing assumed): suitable for most controlled indoor spaces, including warehouse environments with moderate humidity variation.
- Storage temperature down to -15°C: the unit can stage in an unheated warehouse or loading dock through winter without risk of damage — useful for large rollout projects where inventory sits before installation.
- Tower form factor (130 × 660 × 432 mm): designed to stand alongside, not inside, a rack. If your equipment room layout is rack-only, verify floor or shelf clearance before ordering — this is not a rack-mount unit.
Integration and Compatibility
The SRT5KTF is purpose-built for the APC Smart-UPS SRT line. Consult the APC Smart-UPS SRT compatibility documentation to confirm the specific SRT model and input/output voltage configuration required for your facility before purchasing. Verify local supply voltage, required output voltage, and load type — isolation transformers are not interchangeable across arbitrary UPS platforms or power ratings.
For power infrastructure planning, a UPS and power conditioning selector can help match the correct SRT base unit and accessories to your load requirements.
Frequently Asked Questions
Q: What UPS models is the SRT5KTF compatible with?
A: The SRT5KTF is designed for the APC Smart-UPS SRT series at the 5KVA tier. Verify specific model compatibility against APC's SRT accessory compatibility documentation before purchasing.
Q: Is the SRT5KTF a rack-mount unit?
A: No. The SRT5KTF is a tower-form transformer (130 mm W × 660 mm D × 432 mm H). It is not designed for standard 19-inch rack mounting.
Q: What is the operating temperature range for the SRT5KTF?
A: The unit operates from 0°C to 40°C (32°F to 104°F). It is rated for standard commercial indoor environments — confirm ambient temperatures in dense equipment closets before deploying.
Q: Can the SRT5KTF be stored in an unheated space before installation?
A: Yes. Storage temperature range is -15°C to 40°C, so staging in an unheated warehouse or loading dock during winter is within spec.
Q: What does an isolation transformer add to a UPS installation?
A: An isolation transformer provides galvanic separation between the UPS output and the connected load — eliminating ground loops and meeting isolation requirements for sensitive or regulated equipment. It also enables stepped-down output voltage where the facility supply and load voltages differ.
The SRT5KTF sits at the intersection of power conditioning and load protection — a 5KVA isolation and step-down transformer that extends what the Smart-UPS SRT platform can do for facilities where straight UPS output isn't enough. The operating window of 0–40°C covers virtually every controlled indoor environment this unit will see in practice, but that upper limit deserves attention in poorly ventilated equipment rooms.
Technical Highlights:
- 5KVA rating: sized to match the SRT 5K UPS output tier — deploy at full rated load without derating, assuming the load power factor is within design spec.
- Tower form factor (130 × 660 × 432 mm): the deep 660 mm chassis means it needs floor or shelf space, not rack space — factor this into room layout before the unit ships.
- 0–95% humidity tolerance: handles light-industrial and warehouse environments without special enclosure requirements, provided condensation is not present.
Deployment Considerations:
- Confirm the specific SRT base model's input/output voltage configuration matches the SRT5KTF's step-down ratio before ordering — APC publishes SRT accessory compatibility matrices for each regional voltage standard.
- At 6.35 kg shipped, the unit is manageable solo, but the 660 mm depth means standard 600 mm-deep server room shelving won't fit it flush — measure before staging.
The SRT5KTF is best suited for facilities running the APC Smart-UPS SRT platform that serve loads requiring galvanic isolation — medical-adjacent equipment rooms, industrial control panels, or broadcast environments where ground loops are a documented issue.
