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→6.1.1 Low and Medium Electrical Loads
*During make of bouncing contacts mechanical wear, arc erosion, and material transfer occur, the latter mostly in DC switching circuits.
*In the closed condition the value and consistency of the contact resistance must be considered. Both are affected by the resistance tocorrosion and changes in composition caused by the effects of arcing.
*During off-switching (break) the frictional wear leads to material loss; besides this material transfer and arc erosion effect contact life.
