Vertiv™ Liebert® STS2
SL-20610_REV12_09-21 4 Guide Specifications
Proprietary and Confidential © 2021 Vertiv Group Corp.
8. System Bypass. The Liebert® STS2 shall be furnished with key-interlocked maintenance bypass
MCSs that allow the Liebert® STS2 power, controls and monitoring electronics to be bypassed to
either input source for maintenance without interruption of power to the load. The packaging of the
Liebert® STS2 shall have all electronics isolated from the input, output and bypass connections to
allow servicing of any components without access to hazardous voltages when the unit is in
maintenance bypass.
9. Rotational/Regenerative Loads. When a rotational load, such as a motor, is connected to the output
of the unit, the time to detect a source fail and ultimately transfer to the alternate source can extend
beyond the previously outlined timeframe. Regardless, the critical bus voltage is always maintained
within the ITIC standard. Recommend contacting Vertiv for guidance if connecting to a
rotational/regenerative load to the Liebert® STS2.
1.4.3 Performance Requirements
1. Nominal Input/Output Voltage: [(200) (208) (220) (240) (380) (400) (415) (480) (575) (600)] volts
three phase, [(3)]-wire-plus-ground, 4-wire-plus-ground for non-US
2. Default Voltage Range: +10%, -10% of nominal
3. Nominal Frequency: (50) (60) Hz
4. Maximum Continuous Current: [(100) (250) (400) (600) (800) (1000)] amps
5. Source Voltage Distortion: Up to 10% THD with notches and ringing transients
6. Surge Protection: Sustains input surges without damage per criteria listed in ANSI C62.41 Category
B3
7. Sensing and Transfer Time: Refer to Modes of Operation section (Page 2-3) for details.
8. Overload Capability:
• 125% for 30 minutes (100-400A), 125% for 10 minutes (600-1000A)
• 150% for 2 minutes
• 500% for 0.25 seconds
9. Short Circuit Withstand Capability:
1.4.4 Environmental Conditions
1. Storage Temperature Range: -20° to +70°C (-4° to 158°F)
2. Operating Temperature Range: 0° to 40°C (32° to 104°F)
3. Relative Humidity: 0 to 95% without condensation
4. Operating Altitude: Up to 4000 ft. (1200m) above sea level without derating. Above 4000 ft. (1200m),
output current is derated by 6% per 1000 ft. (18% per 1000m).
5. Storage/Transport Altitude: Up to 40,000 ft. (12,200m) above sea level
6. Audible Noise: Less than 55 dBA at 5 ft. (1.5m) with audible alarm off
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