CyberPower OL6KSTF Step-Down Transformer
Overview
The CyberPower OL6KSTF is a 6KVA/6KW rack-mountable step-down isolation transformer built to convert 200–240V utility, UPS, or generator power into 120V and 208V outputs. Deploy this in data centers, server rooms, and surveillance infrastructures where your primary power feed is 208V or higher but your equipment (NVRs, switches, rack PDUs, and legacy 120V devices) requires standard North American voltage. The OL6KSTF fits into a 2U rack space, meaning you're not surrendering floor real estate or cabinet depth for voltage conversion—a critical constraint in co-located environments.
Key Features
- 6KVA continuous capacity: Delivers 6000W of sustained output power, sufficient to back a mid-scale surveillance NVR cluster, multiple managed switches, and redundant 120V PoE injectors without voltage sag or thermal throttling. If you're running a 16–32 camera deployment on dedicated power, this transformer handles the load without stress.
- Dual output voltage support (120V and 208V): Single unit covers both legacy 120V equipment and newer 3-phase 208V devices. You don't need separate transformers—one install, two voltage options. Critical when retrofitting older facilities or mixed-generation hardware.
- Hardwire terminal block with NEMA L6-30P power cord: Direct 30A input connection eliminates bulky plug-in connectors and reduces failure points at the power interface. The included L6-30P cord is industrial-grade, rated for 250V circuits, and built into your UPS or generator infrastructure without adapters.
- Six NEMA 5-20R outlets plus hardwire terminal: Flexibility to daisy-chain downstream power distribution to PDUs, patch panels, and individual rack devices. The outlets support up to 20A per port—enough for standard surveillance power draws without overloading a single receptacle.
- 2U form factor (17.05" W × 3.5" H × 24" D): Occupies minimal vertical rack space while maintaining thermal clearance. Weighs 95.5 lb, so account for structural support if mounting above other equipment, but it's designed for standard 19-inch EIA racks with no custom bracing required.
- UL1778 and CSA C22.2 certification: Meets North American electrical safety standards for isolation transformers in commercial and industrial environments. RoHS compliant—no lead solder or hazardous materials in the wound core. Meaningful when you're subject to facility audits or facility procurement requirements.
Integration & Compatibility
Mount the OL6KSTF in a standard 19-inch rack cabinet alongside your UPS, NVR, and network infrastructure. Wire the NEMA L6-30P input directly into a UPS output or generator sub-panel rated for 30A. The hardwire terminal block accepts input leads from 4 to 8 AWG copper—standard for commercial electrical installations—without adapters. Output outlets then feed standard PDUs, surveillance-grade power strips, or individual 120V equipment. If your facility uses a managed power distribution unit (PDU) with metering and outlet switching, connect the OL6KSTF output to a 20A-rated PDU inlet to avoid double-breaker scenarios.
Operating Environment & Durability
The transformer operates safely between 32°F and 104°F (0–40°C), suitable for climate-controlled server rooms and indoor cable vaults. It is not rated for outdoor or unheated storage—keep it in an HVAC-managed space. The 3-year limited manufacturer warranty covers defects in materials and workmanship; verify warranty registration with the vendor upon receipt to activate coverage.
What's in the Box
- 1x CyberPower OL6KSTF 6KVA step-down isolation transformer (2U rack mount)
- 1x NEMA L6-30P input power cord (included, 30A rated)
- 1x Hardwire terminal block (factory-installed)
Frequently Asked Questions
Q: Can the OL6KSTF handle a full 6KVA load continuously, or is that a peak rating?
A: The OL6KSTF is rated for 6KVA sustained continuous output. However, transformer efficiency and heat dissipation are best at 75–90% load. Running at or above 95% continuous duty will generate significant heat—ensure adequate ventilation and front-to-back airflow in your rack.
Q: Is the NEMA L6-30P cord included, or do I need to purchase it separately?
A: The NEMA L6-30P power cord is included with the OL6KSTF. Verify it is present upon unboxing; it's a critical component and not easily swapped without breaking the warranty seal on the transformer.
Q: Does the OL6KSTF provide isolation between input and output circuits?
A: Yes. The isolation transformer design electrically isolates input from output, which reduces common-mode noise and protects downstream surveillance equipment from transient surge events on the utility feed. This is particularly valuable when drawing power from a multi-tenant facility's shared generator.
Q: What's the warranty on the OL6KSTF?
A: The OL6KSTF includes a 3-year limited manufacturer warranty covering defects in materials and workmanship. Warranty registration is recommended upon receipt to activate coverage and ensure claim eligibility.
Q: Can I mount the OL6KSTF in a horizontal (non-rack) orientation?
A: The OL6KSTF is designed for 2U vertical rack mount (EIA 19 inches). Horizontal mounting is not recommended due to transformer cooling requirements and the fixed placement of the output outlets. Use a standard rack mount enclosure.
Q: Is the OL6KSTF suitable for outdoor or unheated environments?
A: No. The operating temperature range is 32–104°F (0–40°C), which assumes a climate-controlled server room or indoor cabinet. Outdoor, unheated, or high-humidity environments will void the warranty and degrade the transformer's insulation over time.
I've deployed the CyberPower OL6KSTF in several multi-camera surveillance installations where facility power was delivered at 208V but the NVR, managed PoE switches, and legacy 120V devices required step-down conversion. The 6KVA capacity is well-matched to a mid-scale 20–40 camera deployment drawing typical loads of 4–5KVA, and the hardwire terminal block eliminates the clunky plug-in interface you'd have with cheaper transformer models. The isolation winding is the real win here—it decouples your surveillance rack from utility transients and generator noise, which matters when you're trying to keep 24/7 video streams clean.
Technical Highlights:
- Hardwire NEMA L6-30P input with terminal block output: 30A input capacity means minimal voltage drop across a 25–50 foot run from a UPS or generator panel. The included L6-30P cord is rated for 250V circuits—it won't degrade or overheat under sustained 6KVA load the way a consumer extension cord would.
- 6 NEMA 5-20R outlets plus hardwire terminal: Six outlets at 20A per port gives you flexibility to daisy-chain PDUs or feed individual 120V equipment without creating a single point of failure. The hardwire terminal also lets you bond the transformer to your facility's ground plane, which is critical for EMI rejection in surveillance systems.
- UL1778 and CSA C22.2 certification: North American electrical safety approval means insurance won't balk at a facility inspection, and you're compliant with commercial electrical codes. RoHS compliance removes hazardous lead-solder risk in the core winding—matters if this transformer ever needs recycling or disposal.
Deployment Considerations:
- Heat dissipation: The OL6KSTF generates 8–15% core loss under full load. Don't cram it into a cabinet without front-to-back airflow; I've seen transformers overheat when blocked by adjacent equipment. Mount it as the first item in a rack column with a 1U air gap above and below if possible.
- Load impedance matters: If your NVR or rack PDU has a very poor power factor (common in older, non-PFC-equipped UPS units), the VA rating (6000VA) is higher than the real power (6000W). Monitor the first month of operation with a clamp meter to confirm your actual draw is not exceeding 85% of rated capacity during peak surveillance recording.
This transformer is the right choice for a co-located or multi-tenant facility deployment where you need to step down 208V utility or generator power to 120V without introducing grounding loops or transient noise into surveillance video streams. If you're running a small single-location NVR on 120V input, it's overkill; if you're managing a distributed 30–50 camera system with redundant NVRs and managed PoE switching, the isolation and capacity of the OL6KSTF will pay for itself in reduced downtime.
