... lining, steel plate, beautiful appearance and reasonable design CKX8 series air-insulated bus duct is ideal to be used in the ... , 660V2. Rated frequency: 50/60Hz3. Rated current: 100,200,250,400,630,800,1000,1250,1600,2000,2500,3150,4000,5000A4 ... relevant thermal stress and electrodynamic force created by tolerance current Air-insulated bar duct CKX8