Online Calculators and Tables to Help You Determine Proper Wire Size


The Time Overcurrent Relay Operate Time Calculator will calculate the operate time for a time overcurrent relay given the curve, time dial, pickup, and fault current. This calculator allows you to choose both U.S. and IEC curves. The reset time is also provided.

Time Overcurrent Relay Operate Time Calculator


Enter the information below to calculate the operate time for a time overcurrent relay.


Operate Time (seconds) -
Reset Time (seconds) -

Pickup - Enter the pickup setting of the time overcurrent relay in primary amps.

Time Dial - Enter the Time Dial setting of the time overcurrent relay. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves.

Curve - Select the Curve setting of the time overcurrent relay.

Fault Current - Enter the Fault Current for which the operate time should be calculated.


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