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These fuses are used for reverse current protection in solar arrays, as required in the Australian Standards. Using an MC4 inline assembly like these saves you from having to run each string of panels down to the DC control board or into a roof mounted enclosure. These simply connect to the positive of each string before the Y connector is used.
You would typically need reverse current protection when you have 3 or more strings being wired into parallel. If you are unsure if you need this safety feature or have any other questions please email me, firstname.lastname@example.org