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Changes
→13.4.2.1 Electrical Life
U<sub>r</sub> = Recovery voltage
[[File:AC3 contact arc erosion of two differently produced Ag SnO2 contact materials.jpg|right|thumb|AC-3 contact arc erosion of two differently produced Ag/SnO<sub>2</sub> contact materials in a 37 kW contactor <b>1 </b> Ag/SnO<sub>2</sub> 88/12, produced by conventional powder metallurgy with MoO<sub>3</sub> additive, extruded <b>2 </b> Ag/SnO<sub>2</sub> 88/12, powder manufacturing by the reaction-spray process with CuO and Bi<sub>2</sub> O<sub>3</sub> additives, extruded]]
====13.4.2.2 Temperature Rise====
