I would disagree, I say keep it the same but make it require fiber cable to craft instead, as it matches fiber cable's properties perfectly. The main agrument for this is people may have built setups that require it to be .025 EU/b with 512EU so changing it could break their builds. I say just make the current version require fiber cable and then add versions for the rest of the cables (Or at least Copper, Gold and HV, Tin I could take or leave, but if you are making 4 out of the 5 types of cables, might as well be consistent.)
It should not take too much code to add the other types, if IC2 was open source I would do it myself, (if you want to PM me java for the current switch cable I would be willing to re-write it, I just don't have the time to commit to try out to be a full time developer so I never thew my hat in when Al was asking for people when IC2 started)
How I would do it is just to make sub items based off of the base swich cable that exists now and have it just change the texture to match the type of cable (Which would be the same texture just A different color dot to represent the cable type like current cables do) and change the
If you don't want to implement the new cables, please at least change the name from splitter cable to Contactor (or Relay if you are afraid too many people will not know what a Contactor is).