Translations:Overcurrent protection device/16/en
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Some circuits in an off-grid PV system carry current in both directions like the energy storage system circuit as it charges and discharges. This can be an issue for certain types of breakers that are not rated for current flow in both directions. If a breaker is marked on the side specifying a direction for current flow - typically with "line" on top and "load" on the bottom, then it should not be used in a circuit that has current flow in both directions.