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LV control  panel primary and secondary  fusing

Question asked by jz2018 on Mar 28, 2020
Latest reply on May 14, 2020 by jz2018

In low voltage control panels ( typically 120 VAC PLC panels )  how can the code be correctly applied for fusing from a control transformer to loads such as electronic modules.  One main fuse from the line side of the 120 VAC power supply and then branch fuses for each module is normally implemented.   However  if we have a module such as a 16 channel digital input ( each channel isolated ) card, is it required to fuse each input  channel to protect each individual channel circuit ( assuming all channels have the same line and neutral ) ?