Page 94 of Circuit Breakers / Switches by Moeller Electric USA

tripping characteristics tripping characteristics for circuit-breakers moeller sk1230-1157en-na systems cable selectivity and generator protection with nzm3 2.5 h 8000 6000 4000 2000 nzm3 vef characteristics for ir 1,0 x in 93 system and line protection with nzm4 2.5 h 8000 6000 4000 2000 nzm4 aef characteristics for ir 1,0 x in 1000 800 10 min 600 400 200 100 80 1 min 60 40 20 10 8 6 4 2 1 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 0.02 0.01 0.008 0.006 0.004 0.002 0.001 1 t sd [m s 20 1000 800 10 min 600 400 200 100 80 60 40 20 10 8 6 4 2 1 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 0.02 0.01 0.008 0.006 0.004 0.002 40 50 60 70 80 100 x ir 0.001 1 2 3 4 5 6 7 8 910 15 20 30 40 50 60 70 80 100 x ir ii 2 3 4 5 6 7 8 10 12x in 1 min tr [s 20 17 14 10 8 6 4 2 10 00 i2t constant isd 1.5 isd 2 2.5 3 3.54 2 3 4 5 6 7 x ir 630 a 250 a 400 a 5 6 7 8 910 x ir ii ii 2 2.5 3 3.5 4 2 3 4 5 6 7 8 x in 630 a 5 6 7 8 9 11 x in 250 a 400 a 2 3 4 5 6 7 8 910 15 20 30 systems cable selectivity and generator protection with nzm4 2.5 h 8000 6000 4000 2000 nzm4 vef characteristics for ir 1,0 x in 1000 800 10 min 600 400 200 100 80 60 40 20 10 8 6 4 2 1 0.8 0.6 0.4 0.2 0.1 0.08 0.06 0.04 0.02 0.01 0.008 0.006 0.004 0.002 0.001 1 2 3 4 5 6 7 8 910 15 20 30 40 50 60 70 80 100 x ir isd 2 ii 2 3 3 4 4 5 6 7 8 9 10 5 6 7 8 1 min tripping time [s tr [s 20 17 14 10 8 6 4 2 tsd [ms 1000 750 500 without i2t constant function 300 200 100 60 20 0 x ir 10 12 x in circuit-breakers disconnect switches up to 1200 a tripping time [s tripping time [s]

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