Protection and coordination
Time-Current Curve Comparison Calculator
Interpolate and compare two supplied protective-device clearing-time curves at a selected current.
Curve comparison
Selected current and curve points
A
A
s
A
s
A
s
A
s
Interpolated clearing time
3.901 s, Device A
Device B time5.333 s
Absolute time margin1.433 s
Faster device at selected currentA
Curve interpolation onlyUse verified manufacturer time-current data. This comparison does not certify selective coordination, protection settings, or arc-flash performance.
Method and field check
The tool interpolates between two verified points for each device on logarithmic current and time axes. Add more points or use manufacturer software when the curve shape requires it.