2-26 B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALSPECIFICATIONS CHAPTER 2: PRODUCT DESCRIPTION22.5.5 InputsAC CURRENTCT rated primary: 1 to 50000 ACT rated secondary: 1 or 5 A by connectionRelay burden: < 0.2 VA at rated secondaryConversion range:Standard CT: 0.02 to 46 × CT rating RMS symmetricalSensitive Ground CT module: 0.002 to 4.6 × CT rating RMS symmetricalCurrent withstand: 20 ms at 250 times rated1 sec at 100 times ratedcontinuous 4xInomURs equipped with 24 CT inputs have a maximum operating temperature of 50°CShort circuit rating: 150000 RMS symmetrical amperes, 250 V maximum (primary current to external CT)AC VOLTAGEVT rated secondary: 50.0 to 240.0 VVT ratio: 1.00 to 24000.00Relay burden: < 0.25 VA at 120 VConversion range: 1 to 275 VVoltage withstand: continuous at 260 V to neutral1 min/hr at 420 V to neutralFREQUENCYNominal frequency setting: 25 to 60 HzSampling frequency: 64 samples per power cycleTracking frequency range: 20 to 70 HzCONTACT INPUTSDry contacts: 1000 Ω maximumWet contacts: 300 V DC maximumSelectable thresholds: 17 V, 33 V, 84 V, 166 VTolerance: ±10%Contacts per common return: 4Recognition time: < 1 msDebounce time: 0.0 to 16.0 ms in steps of 0.5Continuous current draw: 4 mA (when energized)CONTACT INPUTS WITH AUTO-BURNISHINGDry contacts: 1000 Ω maximumWet contacts: 300 V DC maximumSelectable thresholds: 17 V, 33 V, 84 V, 166 VTolerance: ±10%Contacts per common return: 2Recognition time: < 1 msDebounce time: 0.0 to 16.0 ms in steps of 0.5Continuous current draw: 4 mA (when energized)Auto-burnish impulse current: 50 to 70 mADuration of auto-burnish impulse: 25 to 50 msDCMA INPUTSCurrent input (mA DC): 0 to –1, 0 to +1, –1 to +1, 0 to 5, 0 to 10, 0 to 20, 4 to 20 (programmable)Input impedance: 379 Ω ±10%Conversion range: –1 to + 20 mA DCAccuracy: ±0.2% of full scaleType: Passive
