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Rackmountable step-down isolation transformer with twelve NEMA 5-20R outlets

CyberPower

CyberPower OL5KSTF 5000VA Step-down Isolation Transformer accessory

SKU CH-9X9N-F2TFJ MPN OL5KSTF

A 5000 VA step-down isolation transformer converts 200-240 VAC input to 208 VAC output with twelve NEMA 5-20R outlets in a rackmountable form factor

  • AC input voltage200–240 VAC
  • Input line frequency50/60 Hz
  • Volt-ampere rating5000 VA
  • Power rating5000 W
  • Voltage output208 V
  • AC output frequency50/60 Hz (Auto-sensing/configurable)
  • 5000 VA capacity handles demanding loads
  • 208 V output matches equipment requirements
  • 12 NEMA 5-20R outlets connect multiple devices
  • Auto-sensing 50/60 Hz input adapts automatically
  • Rackmount design fits standard enclosures

5000 VA step-down transformer

The CyberPower OL5KSTF is a 5000 VA step-down isolation transformer that converts a 200 to 240 VAC input to a 208 VAC output. It operates at 50 or 60 Hz with auto-sensing frequency detection. The unit provides twelve NEMA 5-20R outlets for connected equipment. It is designed for rack or tower installation.

Suits 208 V equipment on 200-240 V mains

This transformer suits sites where 208 V hardware must run from a 200 to 240 VAC supply. It is not for locations that already deliver 208 V, nor for loads that require a different output voltage. Buyers needing higher VA capacity or alternative outlet types should look elsewhere.

5000 VA rating and 208 V output

The single specification that decides fit is the 5000 VA rating paired with a fixed 208 V output. The load must not exceed 5000 VA or 5000 W. The input must fall within the 200 to 240 VAC range.

How it compares

Measured against everything we stock in UPS Replacement Batteries, at today’s prices. Recalculated every night.

Price $938.99
Pricier than about 91% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameCyberPower
Model nameOL5KSTF
Power
AC input voltage200–240 VAC
Input line frequency50/60 Hz
Volt-ampere rating5000 VA
Power rating5000 W
Voltage output208 V
AC output frequency50/60 Hz (Auto-sensing/configurable)
Power outlets12 - NEMA 5-20R
Size & build
Rack mountingYes
Shipping weight52.48 kg
Package size899 × 599 × 330 mm

Questions about this item

What UPS capacity must I already have for the OL5KSTF to step down its output?

The OL5KSTF requires a UPS supplying 200–240 VAC at 50/60 Hz and rated for 5000 VA or 5000 W so the transformer can produce 208 V at the same power level.

Can I keep my existing NEMA 5-20R devices when adding the OL5KSTF?

Yes — the unit provides twelve NEMA 5-20R outlets, so any 208 V equipment using that plug fits directly without adapter cables.

How do I confirm the OL5KSTF is delivering the correct voltage after installation?

Measure the output with a multimeter; it should read 208 V while the input frequency auto-senses between 50 Hz and 60 Hz.

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