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DISCONNECT SWITCHES > Fuse Sizing Guide - Fused Disconnect Switches
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Fuse Sizing Guide for Fusible Disconnect Switches

Please Note:

  • This is a basic guide for sizing fuses. Specific installations may require different sizes
  • ALL information shown is for standard duty, low inertia motors (<2 seconds Start Up Time)
  • ALL fusing is to be installed in accordance with NEC and local codes
  • ALL information contained in this document is derived from fuse manufacturer’s information and industry practice
  • Advance Controls, Inc. makes no claim concerning the accuracy or completeness of this Guide

Class CC Fuse – Time Delay
  1. Determine the Full Load Amps (FLA) from the motor
    nameplate
  2. Locate the Motor FLA in the chart below
  3. Choose ACI Catalog Number for the fuse

EXAMPLE:
3 Horsepower, 230 Volt 3 Phase Motor
with an Acceleration Time = 5 Seconds.
Motor Full Load = 9.6 Amps.
At 10 Amp Full Load - 5 Sec column = 20 Amp Fuse
CATALOG NUMBER = 107600

Class J Fuse – Time Delay

  1. Determine the Full Load Amps (FLA) from the motor
    nameplate
  2. Locate the Motor FLA in the chart below
  3. Choose ACI Catalog Number for the fuse

EXAMPLE:
3 Horsepower, 230 Volt 3 Phase Motor.
Motor Full Load = 9.6 Amps.
At 8.01 - 9.80 Amp Full Load column = 12 Amp Fuse
CATALOG NUMBER = 118866


2 Sec 5 Sec 8 Sec AMP
SIZE
CATALOG
NUMBER
0.2 0.2 0.2 1/4 107594
0.4 0.4 0.3 1/2 107593
0.6 0.5 0.5 8/10 107615
0.7 0.6 0.6 1 107589
1 0.9 0.8 1 1/4 107591
1.1 1 0.9 1 1/2 107590
1.3 1.1 1 1  4/5 107592
1.4 1.2 1.1 2 107598
2.1 2.1 1.8 2 1/2 107599
2.6 2.6 2.3 3 107602
3.4 3.2 2.8 4 107605
4.3 3.4 2.8 5 107608
5.2 4 3.4 6 107610
5.7 4.2 3.7 7 107612
6.2 4.6 4.2 8 107614
6.9 5.2 4.5 9 107616
7.7 5.8 4.9 10 107595
8.9 6.6 5.5 12 107596
10 7.7 6.7 15 107597
13.5 10 -- 20 107600
15.8 11.8 -- 25 107601
17.8 13.3 -- 30 107604

Note: Fuses are sold in package quantities of 10
List Price is for ONE single fuse.

MOTOR
FLA
AMP
SIZE
CATALOG
NUMBER
0 - 0.6 8/10 118848
0.61 - 0.80 1 118849
0.81 - 1.00 1 1/4 118850
1.01 - 1.20 1 1/2 118851
1.21 - 1.65 2 118854
1.66 - 2.00 2 1/2 118856
2.01 - 2.40 3   118858
2.41 - 3.30 4 118861
3.31 - 4.10 5 118862
4.11 - 4.90 6 118863
4.91 - 6.40 8 118864
6.41 - 8.00 10 118865
8.01 - 9.80 12 118866
9.81 - 12.0 15 118867
12.1 - 14.5 17 1/2 118868
14.6 - 17.0 20 117045
17.1 - 21.0 25 118869
21.1 - 25.0 30 107096
25.1 - 28.5 35 118870
28.6 - 34.0 40 107098
34.1 - 37.0 45 118871
37.1 - 41.0 50 118872
41.1 - 48.0 60 117044
48.1 - 52.0 70 107104
52.1 - 59.0 80 118873
59.1 - 66.0 90 118874
66.1 - 76.0 100 118875
76.1 - 84.0 125 118877

Note: Fuses are sold in package quantities of 10
List Price is for ONE single fuse.

 

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