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Data Centre Facilities arrow Fail-Safe Transfer Switch arrow Liebert Static Transfer Switch (10A & 16A)

Liebert Static Transfer Switch (10A & 16A)

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The STS is a kind of single-pole automatic transfer device with the capacity of 10 / 16A. It performs the core functions of detection and transfer in the dual-bus system composed of two ways of AC power, and is used in the high-end uninterruptible power supply applications that require high power supply reliability.


  • The key component in the system, the auxiliary power, adopts redundancy design to ensure that the equipment can still operate normally upon the failure of one single power.
  • Full DSP control ensures strong data processing capacity and improves the system reliability.
  • Advanced power-off detection method enables quick judgment of power-off failure.
  • Powerful communication function realizes the remote management through SNMP card (option)


The main power and the standby power can directly connect to the STS on the rack, and the STS can provide redundancy control on the power. Once the main power fails, it will automatically switch to the standby power.


The STS adopts the control technology of "First Disconnect Then Connect"

  • If one-way power fails, the STS can ensure the uninterruptible power supply to the equipment through the other way of power.
  • Once short circuit occurs, the STS can ensure that the failure will not extend to the standby power, and thus ensure the uninterruptible power supply to the equipment.


Model Number 02352247 02352244 02352190
Input Connectors C14 x 2 IEC309 x 2 IEC-C20 x 2
Rated Voltage 220 /230VAC
Rated Frequency 50 / 60Hz
Voltage Range 150 to 300VAC
Frequency Range 50 / 60Hz ± 5Hz
Voltage Distortion < 10%
Output Connectors C13 x 6 C13 x 6 + C19 x 1
Power Factor 0.75 to 1 lead or lag
Overload Capacity 125% for 30 minutes
Efficiency 99%
Number of Poles 2 poles
Automatic Transfer Interval < 6ms typical, < 11ms max
Environmental Parameters
Operating temperature 0 to 40°C
Storage temperature -40 to 70°C
Relative humidity 5 to 95%; no condensation
Elevation 3000m
Mechanical Parameters
Dimension H × W × D (mm) 44 × 430 × 250
Net weight of standard equipment 4.5kg
Gross weight with options 5kg


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