The clip is secured in one place so that it cannot slide off the core (e.g. when exposed to mechanical vibrations).2)
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Additionally, because the clip sits in the recess, the whole setup occupies slightly less space when assembled, than for a comparable core without a recess.
The cores and plates with recess are usually marked with additional “R”, or “S” (slot) for plates. For instance, the core could be E14/3.5/5/R and the corresponding plate PLT14/5/1.5/R or PLT14/5/1.5/S.3)