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The above picture show the Ferranti Tapchanger (tap changer) DS and ES range Moving Contact Arm Assembly. The main components of the moving contact arm assembly consist of the Spur Gear, the special moulding, contact bearing pin, roller contact, moving contact lever, cable socket, compression spring, castle nut, disc washer, bridging resistor. All components are manufactured to original material specifications and drawings. There are several resistors and the bridging resistor values will be dependent upon the individual transformer that the Ferranti Tapchanger is attached to.
 
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