Rule of nomination

Many people will ask this question :What do the part numbers mean?
In general the part numbers can be explained as follows:
e.g. DL-100EAK31/10
  DL(1)   -   100(2)   EAK(3)   3(4)   1(5)   /10(6)
(1)
In chinese,DL means mains filter ,XL means signal fillter
(2) Current
(3) Application andinstalling
(4) The direction of installing
(5) Circiut
(6) Connector

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