For a project I'm doing, I need a key with three positions. However, in order to avoid overvoltages, it can not be open when switching from one pole to another. For example, to switch from pole 1 to pole 2, it must first connect to 2 without leaving 1 and then disconnect from 1 only 2.
Does anyone know the name of this type of key? I've read something about it in a book, but I have no details about it.
Does anyone know the name of this type of key? I've read something about it in a book, but I have no details about it.
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