... 2.three phases ct directly install on MCCB 3.mccb current transformer Three phases (3 in 1) current transformer suitable for primary ... , Merlin Gerlin NS series, Changshu CM1 series SPECIFICATION Primary current: 3×40A-600ASecondary current: 5A, 1AStandard approval: BS7626, IEC44-1, ... 50-60HzRated load: 1.25VA-5VAClass: 0.5, 1.0, 3.0Short-time thermal current: Ith=60×IhRated security coefficient: FS ...