Specifications

Liebert Static Transfer Switch
4 Guide Specification
components without access to hazardous voltages when the unit is in maintenance bypass.
1.4.3 Performance Requirements
A. Nominal Input/Output Voltage: [(200) (208) (220) (240) (380) (400) (415) (480) (600) ( )] volts
three phase, [(3) (4)]-wire-plus-ground.
B. Voltage Range: +10%, -10% of nominal
C. Frequency: (50) (60) Hz. +/-0.5 Hz
D. Maximum Continuous Current: [(100) (250) (400) (600) (800) (1000)] amps
E. Load Power Factor Range: 0.75 to 1.0, leading or lagging.
F. Load Crest Factor: Up to 3.5.
G. Source Voltage Distortion: Up to 10% THD with notches and ringing transients.
H. Surge Protection: Sustains input surges without damage per criteria listed in ANSI C62.41 Category
A and B.
I. Sensing and Transfer Time: 4ms
J. Overload Capability:
125% for 30 minutes (100-400A), 125% for 10 minutes (600
1000A)
150% for 2 minutes,
500% for 0.25 seconds
K. Short Circuit Withstand Capability:
208-240V 380-480V 600V
100-250A 100kA 65kA 25kA
400-600A 100kA 100kA 25kA
800-1000A 100kA 65kA 42kA
1.4.4 Environmental Conditions
A. Storage Temperature Range: -40° to +80°C (-40° to 176°F)
B. Operating Temperature Range: 0° to 40°C (32° to 104°F).
C. Relative Humidity: 0 to 95% without condensation.
D. Operating Altitude: Up to 4000 feet (1200 meters) above sea level without derating. Above 4000 feet
(1200 meters), output current is derated by 6% per 1000 feet (18% per 1000 meters).
E. Storage/Transport Altitude: Up to 40,000 feet (12,200 meters) above sea level.
F. Audible Noise: Less than 55 dBA at 5 feet (1.5 meters) with audible alarm off.
1.4.5 RELIABILITY
1.4.5.1 MTBF
The STS shall be designed for high reliability and high availability with an MTBF exceeding 1,000,000