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Protective Device Time-Current Calculator
Estimate trip time for inverse-time overcurrent devices at a given fault current level.
Device Rating
?
Overcurrent device rated current.
A
Fault Current
?
Available fault current at the device.
A
Curve Type (1=std inv, 2=very inv, 3=ext inv)
?
1=Standard Inverse, 2=Very Inverse, 3=Extremely Inverse.
Time Multiplier Setting
?
Time dial/multiplier setting.
Calculate
Results
Current Multiple
-
×
Estimated Trip Time
-
s
References:
IEEE C37.112; IEC 60255-151; GE/SEL/ABB Relay Manuals