Vertiv™ Liebert® STS2
SL-20610_REV12_09-21 7 Guide Specifications
Proprietary and Confidential © 2021 Vertiv Group Corp.
2.0 PRODUCT
2.1 Fabrication
2.1.1 Materials
All materials of the Vertiv™ Liebert® STS2 shall be new, of current manufacture, high grade and free from
all defects and shall not have been in prior service except as required during factory testing.
The maximum working voltage, current and di/dt of all solid-state power components and electronic
devices shall not exceed 75% of the ratings established by their manufacturer. The operating
temperature of solid-state component subassembly shall not be greater than 75% of their ratings.
2.1.2 Wiring
Wiring practices, materials and coding shall be in accordance with the requirements of the National
Electrical Code (NFPA 70). All bolted connections of busbars, lugs and cables shall be in accordance with
requirements of the National Electrical Code and other applicable standards. All electrical power
connections are to be torqued to the required value and marked with a visual indicator.
Provision shall be made for power and control cables to enter or leave from the top or bottom of the
Liebert® STS2 cabinet.
2.1.3 Frame and Enclosure
The Liebert® STS2 unit, comprised of solid-state, three-pole, dual-position transfer switch, key-
interlocked static switch isolation and bypass MCSs, shall be housed in a single free-standing NEMA type
1 enclosure and meet IP20 requirements. The frame shall be constructed of galvanized steel and pop
riveted to provide a strong substructure. The frame shall include four heavy-duty swivel castors for ease
of installation and four permanent leveling feet for final installation. Doors and removable exterior panels
shall be a minimum of 16GA steel and be powder-painted the manufacturer’s standard color textured
enamel finish paint. A key-lock, hinged front door shall provide access to the MCSs. A tool shall be
required to remove exterior panels that expose hazardous voltages. All removable panels shall be
grounded to the frame for safety and EMI/RFI protection. The cabinet shall be structurally designed to
handle forklifting from the base.
Removable conduit/cable termination plates shall be provided in the top and bottom of the unit for
termination of the two source input and/or output conduits, raceways or cables.
The complete STS shall have maximum dimensions of [30 in./762 mm (up to 250 amps), 38.1 in./965 mm
(400A-600A,), 84 in./2134 mm (800A-100A)] wide by 32.2 in./818 mm deep by 77 in./1956 mm high.
The Liebert® STS2 can be tipped 15 degrees in any direction without falling over.
2.1.4 Cooling (100-600A)
The Liebert® STS2 shall utilize convection air cooling for the enclosure with forced air cooling of the heat
sinks. All fans shall be redundant so that a single fan failure will not cause temperature to increase beyond
acceptable limits. Individual sensor(s) are located on heat sinks for alarm and shutdown. Heat rejection
shall be through screened protective openings in the top of the unit. Air filters shall be located in the
front door at the point of air inlet.
2.1.5 Cooling (800-1000A)
Cooling of the Liebert® STS2 shall be by forced air. Low-velocity fans shall be used to minimize audible
noise output. All fans shall be redundant so that a single fan failure will not cause temperature to increase
beyond acceptable limits. Individual sensor(s) are located on heat sinks for alarm and shutdown. Heat
rejection shall be through screened protective openings in the top of the unit. Air filters shall be located
in the front door at the point of air inlet.
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