Liebert POWER PROTECTION STATIC TRANSFER SWITCH User Manual

This section provides the specifications for the STS2.

The STS2 can be set in several different configurations, according to the model and location. The con-

figuration is set at the factory and does not need to be changed by the customer. These configurations 

apply to both units, the Color Graphical Display and an LED Display.

The STS2 accepts input frequencies of 50 Hz and 60 Hz. The frequency shall be within +/- 0.5 Hz of 

the nominal frequency.

The STS2 models are available to handle various voltages. 
The input voltage must be three phase AC (3 or 4 wire-plus-ground). The STS2 is designed to accept 

an input neutral from each source. The neutral is switched in the 4-pole static transfer switch only.
The voltage shall be within +/- 10% of the nominal voltage.
The output voltage shall be three phase AC (3 or 4 wire-plus-ground). Nominal output voltage shall be 

same as input voltage.
The following table provides nominal voltages, listed according to frequency

These ratings are based upon continuous switch current rating. These ratings are for all voltages and 

frequencies. All units are 100% continuous current rated.

[L-L/L-N]

[L-L/L-N]

200/115V

200/115V

208/120V

208/120V

220/127V

220/127V

240/139V

240/139V

380/220V

380/220V

400/230V

400/230V

415/240V

415/240V

480/277V
600/346V

100
250
400
600
800

1000