U<sub>r</sub> = Recovery voltage
Fig. 13[[File:AC3 contact arc erosion of two differently produced Ag SnO<sub>2</sub> contact materials.2:jpg|right|thumb|AC-3 contact arc erosion of two differentlyproduced Ag/SnO <sub>2</sub> contact materials 2in a 37 kW contactor1 Ag/SnO <sub>2</sub> 88/12, produced by conventional 2powder metallurgy with MoO <sub>3</sub> additive, 3extruded2 Ag/SnO <sub>2</sub> 88/12, powder manufacturing by 2the reaction-spray process with CuO andBi <sub>2</sub> O <sub>3</sub> additives, extruded]]
====13.4.2.2 Temperature Rise====
