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FUSES AND FUSE BLOCKS > Fuse Sizing Guide
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Fuse Sizing Guide for Disconnect Switches, Combination Starters and Pump Panels

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
  • 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. Multiply the FLA by 2
  3. Round to the nearest offered fuse size
  4. Choose ACI Catalog Number for the fuse

Example:

  1. Motor = 5 HP @ 480 VAC - Motor FLA = 7.6
  2. FLA @ 7.6 Amps x 2 = 15.2 Amps
  3. Round fuse size down to 15 Amps
  4. Use ACI Catalog Number 107597
    15 Amp Class CC Time Delay

 

 

Class J Fuse – Time Delay

  1. Determine the Full Load Amps ( FLA ) from the motor nameplate
  2. Multiply the FLA by 1.5
  3. Round to the nearest offered fuse size
  4. Choose ACI Catalog Number for the fuse

Example:

  1. Motor = 5 HP @ 480 VAC - Motor FLA = 7.6
  2. FLA @ 7.6 Amps x 1.5 = 11.4 Amps
  3. Round fuse size up to 12 Amps (11 Amp n/a)
  4. Use ACI Catalog Number 118866
    12 Amp Class J Time Delay
 

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