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Relay Setting Calculator
Calculate overcurrent relay pickup and time multiplier settings.
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Calculate overcurrent relay pickup and time multiplier settings.
Relay Setting Estimator
Enter your numbers below for an instant estimate.
0
π‘ Tip: Pickup is set above full load current.
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
Relay Quick Guide
Typical values for reference.
| Item | Typical | Range | Note |
|---|---|---|---|
| Pickup | 1.2-1.5 x load | Higher for motors | Margin |
| TMS | 0.1-1.0 | Time grading | Coordinate |
| CT secondary | 1 or 5 A | Standard | Match |
| Instantaneous | 8-12 x load | Fault level | Optional |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Relay Setting Calculator FAQ
Answers to common questions about this calculator.
The current at which an overcurrent relay starts to operate.
It gives a quick estimate of relay setting 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.