Manual

7.2 INPUT FUSING AND DISCONNECT REQUIREMENTS
A circuit breaker or a disconnect switch with fuses must be provided in accordance with the National
Electric Code (NEC) and all local codes. Refer to the following table for proper fuse/circuit breaker
rating and wire size.
11
INPUT FUSE / CIRCUIT BREAKER RATINGS AND WIRE SIZE REQUIREMENTS (Note 1)
208/240 Vac, 1 phase 208/240 Vac, 3 phase 400/480 Vac, 3 phase 480/490 Vac, 3 phase
Catalog Fuse Rating Wire Size Catalog Fuse Rating Wire Size Catalog Fuse Rating Wire Size Catalog Fuse Rating Wire Size
HP Number Note(2) AWG (mm
2
) Number Note(2) AWG (mm
2
) Number Note(2) AWG (mm
2
) Number Note(2) AWG (mm
2
)
0.25 174452 10A 14(1.5) 174452 10A 14(1.5)
0.5 174453 10A 14(1.5) 174453 10A 14(1.5) 174459 10A 14(1.5)
1 174454 15A 12(1.5)
174454
10A 14(1.5) 174460 10A 14(1.5) 174464 10A 14(1.5)
174455
1.5 174493 20A 12(2.5)
174493
12/10A 14(1.5) 174461 10A 14(1.5)
174456
2 174494 25/20A 10(2.5)
174494
15/12A 12(2.5) 174462 10A 14(1.5) 174491 10A 14(1.5)
174457
3 174495 30/25A 10(4.0)
174495
20/15A 10(4.0) 174463 10A 14(1.5) 174497 10A 14(1.5)
174458
5 174444 45/40A 10(6.0)
174444
30/25A 8(6.0) 174447 15A 14(1.5) 174448 12A 14(1.5)
174446
7.5 174438 45/40A 8(6.0) 174440 20A 12(2.5) 174442 20A 14(1.5)
10 174439 50/50A 8(10) 174441 30/25A 10(4.0) 174443 20A 12(2.5)
15 174429 80/75A 6(16) 174431 40/35A 8(6.0) 174434 30A 10(4.0)
20 174430 100/90A 4(25) 174432 50/45A 8(10) 174435 40A 8(6.0)
25 174433 70/60A 6(16) 174436 45A 8(6.0)
30 174500 80/70A 6(16)
NOTE 1: Applicable national and local electrical codes take precedence over recommendations in this table.
NOTE 2: Use UL Class CC or Class T fast-acting, current limiting type fuses. Select fuses with low I
2
T values, rated at
200,000 AIC. Recommended fuses are Bussman KTK-R, JJN, and JJS. Similar fuses with equivalent ratings by other
manufacturers may also be acceptable.