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The WL trip unit has a default “Underflow Limit” of 50A.
This means that for loads less than 50A, the display will always show zero current flow. The underflow limit can be reduced but at some risk. In applications where the breaker is in an electrically noisy environment (near VFDs for example), the WL current sensors can be affected by the electrical noise. It is possible that the trip unit will display a small current flow even with the breaker open. This can be disturbing to customers. To eliminate the potential false current reading, the 50A minimum current flow value was selected.
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