Circuit Breaker Short-Circuit Duty Calculator

The calculation of short-circuit duty for medium- and high voltage circuit breakers is fairly a straightforward process if one is familiar with the applicable circuit breaker standards. However, manual calculations could be tedious and could take quite sometime. This simple calculator is designed in order to provide an estimation of a circuit breaker short-circuit duty.

Please take note that it should be the responsibility of the user to review the results of the calculations. Furthermore, this calculator is not intended to replace circuit breaker short-circuit duty simulations software and should be used with caution when applied to real projects.

References:

IEEE Std 551-2006 [The Violet Book]: Recommended Practice for Calculating AC Short-Circuit Currents in Industrial and Commercial Power Systems. (2006). S.I.: IEEE.

IEEE Std C37.5-1979: ANSI Guide for Calculation of Fault Currents for Application of AC High-Voltage Circuit Breakers Rated on a Total Current Basis. (1979). S.I.: IEEE.

IEEE Std C37.010-2016: IEEE Application Guide for AC High-Voltage Circuit Breakers > 1000 Vac Rated on a Symmetrical Current Basis. (2016). S.I.: IEEE.

IEEE Std C37.04-2018: IEEE Standard for Ratings and Requirements for AC High-Voltage Circuit Breakers with Rated Maximum Voltage Above 1000 V. (2018). S.I.: IEEE.

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