The Backflow Test Results Of The Vertical Fuse Disconnector Are Shown
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In a recent PV system string reverse-feed test, after the first two reverse current surges, the vertical fuse switch disconnector protection function activated as expected, but tripped after 250ms, significantly short of the manufacturer's claimed 15ms shutdown capability. For PV DC-side protection, the nhrt40 vertical fuse switch disconnector trip time is directly related to the system's safety protection level and the component's withstand voltage. Excessive shutdown delays can prevent DC circuit energy from being promptly deactivated, increasing the risk of device thermal shock and breakdown.
