Semiconductor soft starter 3RW3 8.7.3 Installation altitude If the installation altitude exceeds 1000 m, this calls for: a reduction in the rated current for thermal reasons a reduction in the rated voltage owing to the limited insulation strength Reduction depending on the installation alti- tude The following graphic shows the reduction in the unit's rated current depending on the installation altitude: 0 500 1000 1500 2000 2500 3000 3500 4000 70 75 80 85 90 95 100 105 installation altitude in m Fig. 8-27: Reduction depending on the installation altitude 8-42 Stand 08/99 I reduction U e reduction e