Emax Low voltage air circuit-breakers - ABB Download Center

Changing the rated uninterrupted currentin relation to the temperatureTemperature deratingThe circuit-breakers can operate at higher temperatures thantheir reference temperature (40 °C) under certain installationconditions. In these cases the current-carrying capacity of theswitchgear should be reduced.The SACE Emax series of air circuit-breakers uses electronictrip units which offer the benefit of great operating stability whensubjected to temperature changes.The tables below show the current-carrying capacities of thecircuit breakers (as absolute values and percentage values) inrelation to their rated values at T = 40 °C.Withdrawable SACE Emax E1Temperature E1 800 E1 1000 E1 1250 E1 1600[°C] % [A] % [A] % [A] % [A]10 100 800 100 1000 100 1250 100 160020 100 800 100 1000 100 1250 100 160030 100 800 100 1000 100 1250 100 160040 100 800 100 1000 100 1250 100 160045 100 800 100 1000 100 1250 98 157050 100 800 100 1000 100 1250 96 153055 100 800 100 1000 100 1250 94 150060 100 800 100 1000 100 1250 92 147065 100 800 100 1000 99 1240 89 143070 100 800 100 1000 98 1230 87 14003Size [A]18001600E1 160014001200E1 12501000800E1 1000E1 800600400200010 20 30 35 40 45 50 55 60 65 70T [°C]ABB SACE 3/7