Enter the feed load current and the relay setting into the calculator to determine the over lead current.

Over Load Current Formula

The following equation is used to calculate the Over Load Current.

OLC = FLC * RS/100

  • Where OLC is the overload current (amps)
  • FLC is the feeder load current (amps)
  • RS is the relay setting (%)

To calculate the over load current, multiply the feeder load current by the relay setting.

What is an Over Load Current?


An over load current is a measure of the excess current relative to normal operating conditions.

How to Calculate Over Load Current?

Example Problem:

The following example outlines the steps and information needed to calculate Over Load Current.

First, determine the feeder load current. In this example, the feeder current is measured as 200 amps.

Next, determine the relay setting. The relay setting, in this case, is 130%.

Finally, calculate the over load current using the formula above:

OLC = FLC * RS/100

OLC = 200* 130/100

OLC = 260 amps