Hello All, I understand this is more of a question for electrical engineers however I have received only baffling replies from electrical engineers so I was hoping a physicist, or someone a little better versed in E&M than I am, could assist in finding an answer to this question. Long story short, I am trying to understand the tradeoffs involved in selecting the different schematics listed in the attached data sheets. (I'll call the S558-5999-M8 schematic A and the S558-5999-P3 schematic B) Now one would think this would be a trivial question for the supplier of this part. However this is the answer I received from a, not-belfuse, vendor, (paraphrased) "Schematics of type B have 12 cores while the other has 8. Therefore we can build type A parts smaller and cheaper." To which I replied, "But they come in the same package and you quote the same price, so then why would anyone select A over B or vice versa?" "Because B is the recommended schematic." "Really. Why?" "Schematics of type B have 12 cores while the other two have 8." From here the conversation just circles. I tried to rephrase the question as, "What physcial property does B posses that A lacks which would make B the recommended schematic." The reply was related to its physical size... I have done a little homework so I can state what little I know in the next post.