|Definition:|| a transformer where the packets of laminations forming the core and yokes surround the windings and enclose generally the major parts of them
NOTE 1 – Generally, shell-type transformers incorporate sandwich windings.
NOTE 2 – Since there are types of transformer which do not come clearly within the categories of "core-type" and "shell-type", the use of these terms is deprecated. Generally they can be avoided by indicating the type of windings, i.e. "concentric" or "sandwich", and/or whether or not the magnetic circuit has unwound magnetic return paths.