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  DATA SHEETS - GMCB 24kV/80kA - 12,000 amp  1.Voltage Rating1.1Normal System Voltage24kV1.2Rated Maximum Voltage25.8kV1.3Voltage Range Factor1.02.Interrupting Current Rating2.1Symmetrical Short Circuit Capability80KA2.2Three second short-time current125KAcarrying capability2.3Close and Latching Capability240KA2.4Percent interrupting capability after100%0-1 min-CO-3 min-CO duty cycle3.Continuous Current Rating12,000A4.Operating Time (60 Hz basis)4.1Permissible Tripping Delay0.25 sec.4.2Interrupting Time5 cycles4.3Opening Time3.8 cycles4.4Closing time7 cycles4.5Minimum allowable reclosing time1 Min4.6Reclosing range1-3 Min5.Temperature Range5.1Maximum Ambient 40°C5.2Minimum Ambient-30°C5.3Contact temperature rise (max.)65°C  Page - 2 6.Insulation Level6.1Power Frequency Withstand Voltage(kV)To Ground And Across The Contacts50kV Across Isolator Contacts60kV6.2Impulse Withstand VoltageTo Ground And Across The Contacts125kV Across Isolator Contacts145kV7.Dielectric Strength at Atmospheric Pressure1.2 times8.Breaks per Phase19.Operating Mechanism12.1TypePneumatic/Spring12.2Individual or common mechanismCommon10.Air System10.1 Operating range of air pressure178-213 psig10.2 Low air pressure alarm181 psig10.3 Low air pressure lockout178 psig10.4 Overpressure relief valve open at235 psig10.5 Compressor 13.5.1ManufacturerEMGLO13.5.2Horsepower1.510.6 Number of close-open2 operations stored in air receiver 10.7 Pump up from atmospheric to operating pressure.7 hrs.10.8 Pump up from lockout to operating pressure12 min.10.9 Compressor motor  13.9.1ManufacturerDayton 13.9.2Voltage230/115ACsingle phase 13.9.3Speed1725 rpm 13.9.4Class of insulationB10.10 Air storage volumePrimary:30kg/cm2G(436 psiG)35 litersSecondary: 15kg/cm2G (213 psiG)200 liters  Page - 3 11.SF6 System11.1Normal operating pressure at 20°C 75 psig11.2Minimum operating pressure with full rating64 psig11.3Temperature compensated gas density alarm69 psig11.4Temperature compensated gas density lockout64 psig11.5Overpressure relief valve105 psig11.6Weight of SF6 gas120 lbs.12.Trip Coil12.1Voltage125V DC12.2Allowable Voltage Range70-140V DC12.3Current10.4A12.4Number of trip coils213.Close Coil13.1Voltage125V DC13.2Voltage Range90-140V DC13.3Current3.3A13.4Number of close coils114.Control Cabinet Heaters14.1Number & Wattage of heaters(4) - 160 Watt14.2Location1-mechanism2-compressor motor 1-control cabinet14.3Voltage120/240V AC  Page - 4 15.Breaker Dimensions15.1Height of breaker8’-6 15.2Total length10' 6 15.3Width12' 8 15.4Weight16,500 lbs.15.5Impact loading for foundation designNone15.6Phase spacing4'-5.15”16.CT Standard Ratings16.1Max. number available per phase216.2Number proposed per bushingper spec16.2Relaying or metering accuracyper spec16.3Accuracy (relaying)C40016.4Ratioper spec16.5Thermal Rating Factor1.517.Maintenance Requirements17.1Arcing contact materialCopper-Tungsten17.2Number of short circuits before10internal maintenance check17.3Number of rated continuous current interruptions 2000before internal maintenance check recommended18.Applicable Standards18.1ANSIC3718.2IEC56
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