Translations:Overcurrent protection device/18/en

OCPDs will have a trip curve which specifies how long the device can sustain current above its continuous duty rating. This is desirable because in electrical systems there are often surge loads that require additional current for a very brief period of time when starting. If an OCPD does not have a slight time delay, it will trip every time one of these loads starts. For all typical circuits in an off-grid PV system, an OCPD with a time delay is recommended.