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Selecting overload protection and wires for transformers involves number of rules that change with transformer size, type, and placement of the overload protection. This calculator helps determine the current values on both sides of the transformer, and estimates available short circuit current.


Quickly calculate; Power, Voltage, Current, and Power Factor. Estimate the maximum available short circuit current at transformer terminals.


Enter values using mouse or keyboard in any sequence you like, current for a given power, or vice versa.

Easy to use

Does not require manual. All terms and definitions explained on screen. Built-in Typical Code multipliers. Built-in typical transformer impedance values.

Software:Electrical Calculator
Developer:MC Group
Size:1.4 Mb
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Electrical Calculator

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  1. Richard
    Jan 12, 2018

    I want to congrats to Edvard for show us and tech the engineering techical, and standard use for calculation. Really he’s a good professional. I appreciate you work in this area.

  2. panday9455
    Mar 22, 2013

    hello i have downloaded fuse selection and instaled it but i am unable to open
    my operating system is win7 what i do please help

    Feb 14, 2013

    i cant download it from

  4. tonton
    Jul 02, 2012

    Hello Good Morning …i got a problem installing the software any body can help me….Thanks
    “An Error Occurred while registering the file

    • Edvard
      Jul 02, 2012

      What Windows OS you’re using? If it is Win7, try to open it in compatibility mode for WinXP.

      • tonton
        Jul 02, 2012

        im using Win7…ill check….

    • Haris
      Jan 24, 2014

      I have no problem, I just clicked ignore

  5. ays10
    Mar 17, 2012

    thank’s a lot , keep on going up

    Nov 14, 2011


  7. Edvard
    Jul 14, 2011

    Yes, it’s very handy tool for making quick calculations.

  8. baseemkhan04
    Jul 12, 2011

    veryy effective

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