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Overcurrent Protection and Devices, Short-Circuit Calculations ...

Overcurrent Protection and Devices, Short-Circuit Calculations ...

Electrical Plan Review

Electrical Plan Review Let-Through Charts LOW-PEAK ® YELLOW Class L Time-Delay Fuses KRP-C_SP INSTANTANEOUS PEAK LET THRU CURRENT IN AMPERES 1000000 900000 800000 700000 600000 500000 400000 300000 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 A 2000 1000 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000 PROSPECTIVE SHORT CIRCUIT CURRENT - SYMMETRICAL RMS AMPERES 200000 300000 B 6000A 5000A 4000A 3000A 2500A 2000A 1600A 1200A 800A 601A AMPERE RATING KRP-C_SP Fuse – RMS Let-Through Currents (kA) Fuse Size Prosp. Short 601 800 1200 1600 2000 2500 3000 4000 5000 6000 C.C. I RMS I RMS I RMS I RMS I RMS I RMS I RMS I RMS I RMS I RMS 5,000 5 5 5 5 5 5 5 5 5 5 10,000 8 10 10 10 10 10 10 10 10 10 15,000 9 12 15 15 15 15 15 15 15 15 20,000 10 13 17 20 20 20 20 20 20 20 25,000 11 14 19 22 25 25 25 25 25 25 30,000 11 14 20 24 27 30 30 30 30 30 35,000 12 15 21 25 29 35 35 35 35 35 40,000 13 16 22 26 30 35 40 40 40 40 50,000 14 17 23 28 32 37 50 50 50 50 60,000 15 18 25 30 34 40 49 60 60 60 70,000 15 19 26 32 36 42 52 62 70 70 80,000 16 20 27 33 38 44 54 65 76 80 90,000 17 21 29 34 39 45 56 67 79 90 100,000 17 22 30 36 41 47 58 70 81 100 150,000 20 25 34 41 47 54 67 80 93 104 200,000 22 27 37 45 51 59 73 87 102 114 250,000 24 29 40 49 55 64 79 94 110 123 300,000 25 31 43 52 59 68 84 100 117 30 Note: For I RMS value at 300,000 amperes, consult Factory. LOW-PEAK ® YELLOW Class J, Dual-Element Time-Delay Fuses LPJ_SP INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 A 200 100 100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 B 50000 60000 70000 80000 90000 100000 PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPERES 200000 300000 600A 400A 200A 100A 60A 30A 15A AMPERE RATING LPJ_SP Fuse – RMS Let-Through Currents (kA) Prosp. Fuse Size Short 15 30 60 100 200 400 600 C.C. I RMS I RMS I RMS I RMS I RMS I RMS I RMS 1,000 1 1 1 1 1 1 1 3,000 1 1 1 2 2 3 3 5,000 1 1 1 2 3 5 5 10,000 1 1 2 2 4 6 8 15,000 1 1 2 3 4 7 9 20,000 1 1 2 3 4 7 10 25,000 1 1 2 3 5 8 10 30,000 1 1 2 3 5 8 11 35,000 1 1 2 4 5 9 12 40,000 1 2 3 4 6 9 12 50,000 1 2 3 4 6 10 13 60,000 1 2 3 4 6 11 14 80,000 1 2 3 5 7 12 15 100,000 1 2 4 5 8 12 17 150,000 1 2 4 6 9 14 19 200,000 2 3 4 6 9 16 21 250,000 2 3 5 7 10 17 23 300,000 2 3 5 7 11 18 24 Note: For I RMS value at 300,000 amperes, consult Factory. 17

Electrical Plan Review Let-Through Charts LOW-PEAK ® YELLOW Class RK1 Dual-Element Time-Delay Fuses LPN-RK_SP INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES 400,000 300,000 200,000 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 A 2,000 1,000 1,000 2,000 3,000 4,000 6,000 8,000 10,000 PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPERES LOW-PEAK ® YELLOW Class RK1 Dual-Element Time-Delay Fuses LPS-RK_SP INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES 400,000 300,000 200,000 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 A 2,000 1,000 1,000 2,000 3,000 4,000 6,000 8,000 10,000 20,000 20,000 PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPERES 30,000 30,000 40,000 40,000 60,000 60,000 80,000 80,000 100,000 100,000 B B 200,000 200,000 300,000 300,000 AMPERE RATING 600A 400A 200A 100A 60A 30A AMPERE RATING 600A 400A 200A 100A 60A 30A LPN-RK_SP – RMS Let-Through Currents (kA) Fuse Size Prosp. Short 30 60 100 200 400 600 C.C. I RMS I RMS I RMS I RMS I RMS I RMS 1,000 1 1 1 1 1 1 2,000 1 1 2 2 2 2 3,000 1 1 2 3 3 3 5,000 1 2 2 3 5 5 10,000 1 2 3 4 7 9 15,000 1 2 3 5 8 11 20,000 1 3 3 5 8 11 25,000 1 3 3 5 9 12 30,000 2 3 4 6 9 12 35,000 2 3 4 6 10 13 40,000 2 3 4 6 10 13 50,000 2 3 4 7 11 14 60,000 2 3 4 7 11 16 70,000 2 3 4 7 12 16 80,000 2 4 5 8 12 16 90,000 2 4 5 7 13 17 100,000 2 4 5 8 13 17 150,000 2 4 6 9 15 19 200,000 3 5 6 11 16 20 250,000 3 5 7 11 17 21 300,000 3 6 7 12 18 22 LPS-RK_SP – RMS Let-Through Currents (kA) Fuse Size Prosp. Short 30 60 100 200 400 600 C.C. I RMS I RMS I RMS I RMS I RMS I RMS 1,000 1 1 1 1 1 1 2,000 1 1 2 2 2 2 3,000 1 1 2 3 3 3 5,000 1 2 2 3 5 5 10,000 1 2 3 4 7 10 15,000 1 2 3 5 8 11 20,000 2 3 3 5 9 12 25,000 2 3 4 6 9 12 30,000 2 3 4 6 10 13 35,000 2 3 4 6 10 13 40,000 2 3 4 6 10 14 50,000 2 3 5 7 11 15 60,000 2 4 5 7 12 15 70,000 2 4 5 8 13 16 80,000 2 4 5 8 13 16 90,000 2 4 5 8 13 17 100,000 2 4 6 9 14 17 150,000 3 5 6 10 15 19 200,000 3 5 7 11 16 21 250,000 3 6 7 12 17 22 300,000 3 6 7 12 18 23 18

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