*'''Contact welding''' <br />occurs when melt-liquefied touching areas of the contact parts come in contact with each other. The melting occurs during high current carrying through these areas. During make operations this occurs through bounce arcs, on closed contacts a too high contactresistance or dynamic separation of the contacts due to high short circuit currents can cause the welding of the contacts. The welding then maycause a device failure if the device specific opening forces cannot break the weld connection. <br />