*'''Make operation ''' <br />Make erosion caused by pre-close and bounce arcs <br />Welding mainly during bounce arc <br />Mechanical wear mainly through bounce and relative motion<br/>

*'''Current carrying through closed contacts ''' <br />Increased contact resistance and temperature rise <br />during nominal load <br />Welding through high contact resistance during overload and short circuit load <br />Welding during dynamic separation of the contacts with arcing

*'''Break operation ''' <br />Arc erosion during opening <br />Arc movement <br />Arc extinguishing <br />Mechanical wear