Model Number: CHZ7-33 Brand Name: YUFLY Key Specifications/Special Features: 1: Arc-extinguish chamber.2: long electrical lifetime and high insulating capability.3: Maintenance free.4: Safe and reliable operation.Optional equipment:1: Current transformer, metering and protection poles 3pcs for each, 75/5 or higher.2: Outside voltage transformer 2pcs for control power supply and metering.3: Motor spring operating mechanism AC DC 220/110/48/24V.4: Reclosing controller and FTU, RTU. Item Unit Data Rated voltage kV 33 Rated current A 630,1250,2000,3150 Rated short circuit breaking current kA 20,25,31.5,40 Rated short circuit making current kA 50 Rated short time withstand current kA 20 Rated short circuit duration time s 4 1 min P.F withstand voltage kV 95 Lightning impulse withstand voltage kV 185 Rated operating sequence O-0.3s-CO-180s-CO Mechanical lifetime Times 10000 Rated operation voltage V 220V DC AC