Answer / matt

Let through energy is the amount of energy that will be let though in a short circuit condition. The let through energy (I^2t) is calculated from the fault clearing time and the trip multiplier, which is obtained from the MCCB manufacturer. Let through energy is useful in sizing downstream cables.

Answer / rohit

Let through energy of MCCB or Fuse is the energy required
for the operation of magnetic coil (in case of MCCB) or
fusing the metallic wire of fuse.
this shall be as small as possible for the protection of
downstream electrical equipment such as cables, motors etc.

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