Overcurrent protection
To ensure reliable and safe operation, it is recommended to install a suitably rated inline fuse or circuit breaker within the DC power cabling between the Blue Smart IP22 Charger and battery/batteries, located as close as practical to the battery/batteries; this is particularly important for hardwired installations.
The primary purpose of an inline fuse or circuit breaker located close to the battery/batteries (energy source) is to protect the cabling and system in the event of a overcurrent fault, such as a short circuit in the DC power cabling; a fuse or circuit breaker located in the charger unit or nearby within the DC power cabling will not provide protection from a short circuit in the unprotected length of cabling.
In the event of a short circuit in the DC power cabling between the battery/batteries and charger, the battery/batteries have the capability to provide extremely high current through the DC power cabling, which can result in severe overheating of the cabling and potentially a fire unless the battery/batteries (energy source) is promptly disconnected by a suitable fuse or circuit breaker.
Refer to the table below for the recommended fuse / circuit breaker rating, depending on the charger model:
Notice
The fuse / circuit breaker rating recommendations above are based on a 75% maximum normal operating current limit for the minimum fuse / circuit breaker rating and the maximum current capability of the related DC power cabling size/gauge for the maximum fuse / circuit breaker rating; these recommendations are generic and do not cover the intricacies of all installations and/or fuse / circuit breaker types, please consult a certified installer for guidance with specific and/or complex installations.