Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 111
15.2.12 Maintenance Bypass
The Liebert STS2 is configured to allow the unit’s electronics to be bypassed to either input source for
maintenance without interruption of power to the load.
The Liebert STS2 is furnished with key-interlocked maintenance bypass breakers to configure the bypass.
Liebert STS2 units have all electronics isolated from the input, output, and bypass connections to allow safe
servicing of any components without access to hazardous voltages when the unit is in maintenance bypass.
See 10.4 - Maintenance Bypass on page 64 for instructions using the Color LCD Graphical Display unit and
14.2.3 - Maintenance Bypass on page 103 for instructions using the LED units.
15.2.13 Fuseless Design
All Liebert STS2 units are fuseless and are UL rated for use with upstream circuit breakers only.
15.2.14 Options
The following options are available for the Liebert STS2:
See 6.0 - Options for more information.
Programmable Relay Board Remote Source Selection
Optimized Transfer Key Lockout Switch
Distribution Cabinet With I-Line Panelboard Redundant Output Breaker
Input Contact Isolator Board Transfer Inhibit
Comms Board w/Liebert SiteScan and Interface Input Junction Boxes and Cable
Liebert IntelliSlot SNMP/Web/Modbus 485 Card Seismic Floor Anchors
LED Display Seismic Floor Stand - 18", 24", 30" and 36"
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