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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 INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES FUSETRON ® Class RK5 Dual-Element Time-Delay Fuses FRN-R 400000 300000 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 A 2000 B AMPERE RATING 600A 400A 200A 100A 60A 30A FRN-R – 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 5,000 1 2 3 5 5 5 10,000 2 3 4 7 10 10 15,000 2 3 5 8 11 15 20,000 2 4 5 8 12 16 25,000 2 4 6 9 13 17 30,000 2 4 6 10 14 18 35,000 2 4 6 10 15 19 40,000 2 5 7 11 15 20 50,000 3 5 7 11 17 21 60,000 3 5 8 12 18 22 70,000 3 6 8 13 19 23 80,000 3 6 8 13 19 24 90,000 3 6 9 14 20 25 100,000 3 6 9 14 21 26 150,000 4 7 10 16 24 29 200,000 4 8 11 18 26 32 1000 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000 200000 PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPERES FUSETRON ® Class RK5 Dual-Element Time-Delay Fuses FRS-R INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPERES 400000 300000 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 A B AMPERE RATING 600A 400A 200A 100A 60A 30A FRS-R – 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 5,000 1 1 3 4 5 5 10,000 1 2 4 5 9 10 15,000 1 2 4 6 10 14 20,000 2 2 5 7 11 15 25,000 2 2 5 7 12 17 30,000 2 3 5 8 13 18 35,000 2 3 5 8 13 18 40,000 2 3 6 9 14 19 50,000 2 3 6 9 14 20 60,000 2 3 6 10 15 22 70,000 3 4 7 11 17 23 80,000 3 4 7 12 17 23 1000 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000 200000 90,000 3 4 7 12 17 24 100,000 3 4 8 13 18 25 150,000 3 5 9 14 21 27 200,000 4 6 9 16 23 32 PROSPECTIVE SHORT-CIRCUIT CURRENT - SYMMETRICAL RMS AMPERES 19

Electrical Plan Review Let-Through Charts TRON ® Class T Fast-Acting Fuses JJN INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS 400,000 300,000 200,000 100,000 80,000 60,000 40,000 30,000 20,000 10,000 8,000 6,000 4,000 3,000 2,000 1,000 800 600 400 300 A 200 100 200 300 400 600 800 1,000 2,000 3,000 4,000 6,000 8,000 10,000 20,000 30,000 40,000 60,000 80,000 100,000 B 200,000 AMPERE RATING 1200 800 600 400 200 100 60 30 15 PROSPECTIVE SHORT-CIRCUIT CURRENT–SYMMETRICAL RMS AMPS JJN – RMS Let-Through Current (kA) Fuse Size Prosp. Short 15 30 60 100 200 400 600 800 1200 C.C. I RMS I RMS I RMS I RMS I RMS I RMS I RMS I RMS I RMS 500 1 1 1 1 1 1 1 1 1 1,000 1 1 1 1 1 1 1 1 1 5,000 1 1 1 1 2 3 5 5 5 10,000 1 1 1 2 2 4 6 7 9 15,000 1 1 1 2 3 4 6 9 10 20,000 1 1 1 2 3 5 7 10 11 25,000 1 1 2 2 3 5 7 10 12 30,000 1 1 2 2 3 5 8 11 13 35,000 1 1 2 3 4 6 8 11 13 40,000 1 1 2 3 4 6 9 11 13 50,000 1 1 2 3 4 7 9 12 15 60,000 1 1 2 3 4 7 10 13 16 70,000 1 1 2 3 5 7 10 14 17 80,000 1 2 2 3 5 8 11 15 17 90,000 1 2 2 3 6 8 11 15 18 100,000 1 2 2 4 6 8 12 16 19 150,000 1 2 3 4 6 9 13 17 22 200,000 2 2 3 4 7 9 15 19 23 TRON ® Class T Fast-Acting Fuses JJS INSTANTANEOUS PEAK LET-THROUGH CURRENT IN AMPS 400,000 300,000 200,000 100,000 80,000 60,000 40,000 30,000 20,000 10,000 8,000 6,000 4,000 3,000 2,000 1,000 800 600 400 300 A 200 100 200 300 400 600 800 1,000 2,000 3,000 4,000 6,000 8,000 10,000 20,000 30,000 40,000 60,000 80,000 100,000 B 200,000 AMPERE RATING 800 600 400 200 100 60 30 PROSPECTIVE SHORT-CIRCUIT CURRENT–SYMMETRICAL RMS AMPS 15 JJS – RMS Let-Through Current (kA) Fuse Size Prosp. Short 15 30 60 100 200 400 600 800 C.C. I RMS I RMS I RMS I RMS I RMS I RMS I RMS I RMS 500 1 1 1 1 1 1 1 1 1,000 1 1 1 1 1 1 1 1 5,000 1 1 1 2 3 4 5 5 10,000 1 1 1 2 3 6 8 9 15,000 1 1 2 3 4 7 10 11 20,000 1 1 2 3 4 7 10 12 25,000 1 1 2 3 5 7 11 13 30,000 1 1 2 3 5 8 12 14 35,000 1 1 2 3 5 9 13 15 40,000 1 2 2 4 5 9 13 15 50,000 1 2 2 4 6 10 14 17 60,000 1 2 3 4 6 10 16 18 70,000 1 2 3 4 7 11 17 19 80,000 1 2 3 4 7 11 17 20 90,000 1 2 3 4 7 12 18 21 100,000 2 2 3 5 7 12 19 22 150,000 2 3 4 6 8 14 22 25 200,000 2 3 4 6 9 16 24 28 20

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