calculatorsonline.co.uk
Short Circuit Current Calculator
Estimate prospective short circuit current at a transformer secondary.
bolt Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Short circuit
Compare Your Options And Get Clear Answers
Estimate prospective short circuit current at a transformer secondary.
Short Circuit Current Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Isc = FLA / Z.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Short Quick Guide
Typical values for reference.
| kVA | Voltage | Z % | Isc kA |
|---|---|---|---|
| 100 | 400 | 4 | 3.6 kA |
| 500 | 400 | 5 | 14.4 kA |
| 1000 | 400 | 6 | 24.1 kA |
| 1500 | 690 | 6 | 20.9 kA |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Short Circuit Current Calculator FAQ
Answers to common questions about this calculator.
FLA over impedance.
It gives a quick estimate of short circuit current from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.