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15.2
System Components
All STS2 models provide two static transfer switches within one enclosure, with the ability to transfer
between two input sources to a single output.
All STS2s are configured with either an LCD Color Graphical Interface touch screen display or LEDs
for monitoring and configuring the unit.
This section lists the common components and the differences for both types of units.
15.2.1 Frame and Enclosure
The complete STS2 is housed in a freestanding enclosure. The cabinet is a NEMA type 1 enclosure
and meets IP20 requirements. The cabinet is structurally designed to handle lifting from the base.
The frame is designed to accommodate floor stands.
Table 21
Frame Sizes
Rating
100 – 250A 3 pole
400 – 600A 3 pole
800 – 1000A 3 pole
The distributed floor weight for STS2 is less than 150 lbs./sq. ft. (660kg/m²).
The required service access is only from the front of the unit.
The STS2 can be tipped 15° in any direction without falling over.
15.2.2 Castors, Leveling and Seismic Anchoring
The frame includes heavy-duty swivel castors for ease of installation, plus permanent leveling feet for
final installation.
The unit also can be fastened to the floor using optional seismic anchors to meet seismic Zone 4
requirements. See 4.0 - Locating the STS2 and Figures 11 through 13 for instructions and details
for installing seismic anchoring.
15.2.3 Cooling
The STS2 100 – 600A units utilize convection air cooling for the enclosure with forced air cooling of
the heat sinks. The 800-1000A units are fan cooled using low-velocity fans to minimize audible noise.
All fans are redundant so that a single fan failure cannot cause temperatures to increase beyond
acceptable limits.
Air intake is through screened protective openings in the front of the unit. A standard furnace filter is
installed behind the openings.
By opening the front door, the filter can be changed easily without exposing personnel to high voltage.
The size of the filter is 1 in. x 25 in. x 25 in. (2.54 cm x 63.5 cm x 63.5 cm).
The air exhaust is through the top of the unit.
Width
30 in (76 cm)
38 in (96 cm)
84 in (213 cm)
112
Depth
32 in (81 cm)
32 in (81 cm)
32 in (81 cm)
Specifications
Height
76.77 in (195 cm)
76.77 in (195 cm)
76.77 in (195 cm)
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