Page 91 of Contactors and Motor Protection by Moeller Electric USA

overloadrelays selection aids tripping times for zev electronic motor-protective relay tripping class can be selected tripping time in s ± 20 setting current ie x3 x4 x5 x6 x 7.2 x8 x 10 class 5 11.3 8 6.1 5 4.1 3.6 2.9 10 22.6 15.9 12.3 10 8.2 7.3 5.7 15 34 23.9 18.4 15 12.3 10.9 8.6 20 45.3 31.8 24.6 20 16.4 14.6 11.5 25 56.6 39.8 30.7 25 20.5 18.2 14.4 30 67.9 47.7 36.8 30 24.5 21.9 17.2 35 79.2 55.7 43 35 28.6 25.5 20.1 40 90.5 63.6 49.1 40 32.7 29.2 23 with 3-pole symmetric loading from cold state recovery time after overload trip overview of the recovery time in minutes class trecovery min 5 5 10 6 15 7 20 8 25 9 30 10 35 11 40 12 with unbalance 50 and with phase failure the trip occurs in 2.5s thermistor tripping rated trip resistance recovery resistance r 3200 ± 15 r 1500 10 total ptc thermistor resistance rk 1500 at rk 250 per sensor 6 sensors at rk 100 per sensor 9 sensors ready to respond after trip at 5 k under response temperature test button tripping time 5s ec prototype test certification number ptb 01 atex 3233 for protection of motors in eex e area also order awb2300-1433g zev motor-protective system overload monitoring of motors in eex e areas minutes tripping characteristics these tripping characteristics are mean values of the spread at 20°c ambient temperature in a cold state tripping time depends on response current with devices at operating temperature the tripping time of the overload relay reduces to approximately 25 of the read off value 2h 100 15 10 5 2 1 seconds zev 3-pole with a phase failure or unbalance 50 the zev will trip within 2.5 seconds class 40 35 30 25 20 20 10 15 7 10 5 3 class 5 2 1 1 2 3 4 5 6 7 8 910 x setting current 92

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