Specifications
15.2System 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 | Width | Depth | Height |
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100 | – 250A 3 pole | 30 in (76 cm) | 32 in (81 cm) | 76.77 in (195 cm) |
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400 | – 600A 3 pole | 38 in (96 cm) | 32 in (81 cm) | 76.77 in (195 cm) |
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800 | – 1000A 3 pole | 84 in (213 cm) | 32 in (81 cm) | 76.77 in (195 cm) |
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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
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
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.
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