Fault Current Calculator4.2.1 - App Store

Eaton's Bussmann Series FC2 Available Fault Current Calculator application is an innovative tool developed for contractors, engineers, electricians, and electrical inspectors. This tool can be used on the Bussmann website or out in the field on a mobile device for those needing a quick and simple way to determine available fault current.

With this simple tool, users can:

- Calculate available fault current on single and three-phase systems

- Create and send a label via email for marking the available fault current on service equipment (NEC(R) 110.24)

- Size fuses and conductors for service, feeder, and branch circuits.

This application, calculations, and other information are intended to clearly present technical information that will determine the available fault current at specific points in an electrical system. Bussmann reserves the right, without notice, to change this application and/or discontinue/ limit its distribution and/or availability. Bussmann also reserves the right to change or update, without notice, any technical information contained in this application. The data and information presented in this application are believed to be accurate. However, any and all liability for the content, or any omissions from this application, including any inaccuracies, errors, or misstatements in such data, calculations or information, is expressly disclaimed. The application, calculations and other information are provided without warranty of any kind, either expressed or implied, but not limited to, the implied warranties of merchantability, or fitness for a particular purpose. Bussmann disclaims any liability for the use of this application, calculations or other information. The complete End-User License Agreement can be found at: https://faultcurrentcalculatorpro.bussmann.com/home/eula

Version History We’ve made several behind-the-scenes improvements to enhance the user experience:
- Smoother navigation for a streamlined sign-up process

- Minor bug fixes to keep things running reliably
- Small design tweaks for a cleaner, more intuitive interface
Update now to enjoy a more seamless FC2 experience! 4.2.1 09/17/2025 Users now have two options to choose from, the Standard or Pro version.

The Standard version is free for all users and provides essential tools and functionalities, including:
- Create one-line diagrams
- Perform basic fault current calculations
- Send calculations to the registered email only
- Generate up to 4 PDF files of available fault current calculations per day
- Handle transformer sizes up to 5 MVA

For a more comprehensive solution, the Pro version offers everything in the standard version plus advance features including:
- Send calculations to ANY email address
- Generate UNLIMITED PDF file of available fault current calculations
- Handle transformer sizes up to 10 MVA
- Save and edit diagrams
- Edit and mange projects
- Simplified component modification to add, delete, and edit components
- Add generator to the system
- Set default transformer value (from previous selection) for a quick selection
- Add motor contributions for single phase system
- Consolidate multiple project calculations in a single email 4.2.0 06/06/2025 User experience enhancements and bug fixes. 4.1.6 07/08/2022 Updated user interface. 4.1.4 05/07/2020 Updated the fuse sizing and user guide functions. 4.1.3 04/13/2019 Updated language translation. 4.1.2 11/08/2018 - Design changes to accommodate new devices and OS versions. 4.1.1 10/05/2018 VERSION 1.5.0 NOTES
- update user interface
- added French & Spanish translations
- fixed number input bugs 1.5.1 08/04/2015 VERSION 1.5.0 NOTES
- update user interface
- added French & Spanish translations
- fixed number input bugs 1.5.0 07/17/2015 VERSION 1.3.0

- Added JPEG label creation feature and updated label designs (better-optimized for label printers)

- Fixed 1000kcmil conductor run bug

- Updated fuse sizing guide errors.

- Added system sub-header button for easy access back to system diagram 1.3.0 09/18/2013 - Minor fixes to UI issues found

- Modification made to motor contribution calculation (motor contribution now choked at each additional transformer). 1.2.0 06/21/2013 - Fixed issue with user guide and fuse sizing guide. 1.1.0 06/05/2013 1.0.3 05/21/2013