Square D Digest 179

Medium Voltage Switchgear

Shielded and Solid Insulation System (SSIS) Class 6045 / Refer to Catalog 6045CT1601

www.se.com/us

Premset Compact Vacuum Circuit Breaker Switchgear with Shielded Solid Insulation System (2SIS) Premset is 15 kV vacuum circuit breaker switchgear technology that takes advantage of the innovative shielded solid insulated system (2SIS). 2SIS creates a three-layered system (medium voltage conductive layer, epoxy insulating layer, and grounded shield layer) throughout the entire switchgear that optimizes performance and increases life expectancy. Premset reduces the opportunity of arc flash or contact with live parts by insulating and screening all live parts in an epoxy dielectric molding. In addition, a grounded shield layer helps reduce the likelihood of exposure to electrical hazards while at the same time better protecting the insulating material from harsh environmental conditions such as moisture, dust, chemicals, and vermin. Premset delivers a compact architecture that is both modular and flexible. It allows for front-only accessibility (bottom incoming cables) and the smallest 15 kV vacuum circuit breaker footprint on the market. Plug-and-play design of accessories and auxiliaries makes even last minute or field modifications possible. Modular design improves cost savings and optimizes delivery times. Premset’s modular configurations make it a great fit for applications and intuitive to learn for operators. Premset has options for both indoor and outdoor enclosures with transitions to dry type transformers.

Table 11.57: Premset Ratings Voltage Class

5and15kV

Bus Current Rating

600 and 1200 A

1200A 1200A

Circuit Breaker Current Rating Maximum Short-Time Interrupting Current Rated BIL Withstand Voltage

100A

200A

600A

25 kA (2 seconds)

95kV

11 SWITCHBOARDS AND SWITCHGEAR

Listed Metal-Enclosed Interrupter Switchgear

Table 11.58: Dimensions

600A

14.76 in. (375 mm) x 96.76 in. (2458 mm) x Various 29.53 in. (750 mm) x 96.76 in. (2458 mm) x Various 14.76 in. (375 mm) x 99.77 in. (2534 mm) x Various 29.53 in. (750 mm) x 99.77 in. (2534 mm) x Various

Indoor

1200A

600A

Outdoor

1200A

11-40

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