38Instruction Booklet IB 33-790-1JEffective November 2010Instructions for Low Voltage PowerCircuit Breakers Types DS and DSLEaToN CorPoraTIoN www.eaton.comSection 6 - Circuit Breaker Pole Units, Description, and Operation6.0 GENERALFigures 33, 34, 35, and 36 show detailed three poleassemblies of all of the type DS circuit breakers.DS206 has the three poles mounted on a single moldedbase of high strength insulating material, with the contactparts and sensors mounted on it. Figures 37 and 38show front and rear views of the assembly.The DS416, DS420, DS632 and DS840 differ in thateach of the three poles are mounted on individual insulat-ing bases, and all three poles held in accurate alignmentby a welded steel frame. Front and rear views of each areshown in Figures 39 and 40 for the DS416, Figures 41and 42 for the DS420, Figures 43 and 44 for the DS632,Figures 45 and 46 for the DS840.6.1 MOVING CONTACT SUB-ASSEMBLIESThe moving contact members of all ratings consist ofblades hinged at the bottom to the lower main terminalthrough controlled pressure rotating contacts and withmain and arcing contacts at the upper end. The arcingcontacts of all of the five ratings shown are essentially thesame design. The number of blades, the size of the mainterminals and the number of fingers in the main discon-necting contacts vary with the rating. The DS206 has twomoving blades, the DS416 and DS420, four movingblades, and the DS632 and DS840, eight moving blades.On the DS206, two butt type main contacts and a knifeFig. 33 Three-pole Assembly of DS-206 Pole Units on Frame.
