Medium-voltage (MV) gas-insulated switchgear (GIS) types 8DA10 and 8DB10 are gas-insulated, vacuum circuit breaker designs with a maximum design voltage of 4.16 kV up to 38 kV (42 kV on request). Lightning impulse withstand voltage ratings up to 200 kV BIL and interrupting ratings up to 40 kA are available. The types 8DA10 and 8DB10 MV GIS designs feature fixed-mounted vacuum circuit breakers, connectable to the main bus through three-position (CLOSED-OPEN-READY TO GROUND) switches. The position of the switches is indicated by reliable contact position indicators and can also be visibly verified from the front of the unit using a convenient camera system and laptop computer.
MV GIS is approximately 1/5th the size of conventional air-insulated switchgear depending upon the voltage rating and is suitable for systems where small size, arc resistance, environmental immunity and/or reduced maintenance needs are important.
Low pressure SF6 gas-insulated for insulation only and not for interruption
Tested for arc-resistance to ANSI/IEEE C37.20.7-2007, type 2B
Single-phase design eliminates phase-to-phase faults inside the switchgear
Significantly reduced PPE needs
Single-bus (type 8DA10) or double-bus (type 8DB10) configurations available
Vacuum interrupter - up to 30,000 mechanical operations
Well suited for contaminated environments
Compact - up to 80% smaller than air-insulated switchgear
20-year internal maintenance cycle
Meets IEEE and IEC standards
Meets NEC visible disconnect requirement
UL-or C-UL Listing available (consult factory)
Seismic capability up to UBC zone 4 (optional)
Pair with Siemens protective relays to match any typical application
Front access design - rear access normally not necessary
Disconnector (isolator) switch for line- or load-side (optional)
Voltage transformers with disconnector switch and primary fuses available
Plug-in voltage transformers fused and non-fused (optional)
Plug-in surge arresters (optional)
Power equipment center (PEC) configurations available for outdoor applications
Locally trained factory personnel in the U.S. available for start-up or maintenance
Over 55,000 panels installed worldwide with more than 2,200 installed in the U.S.