A reed switch consists of two ferromagnetic and specially shaped contact blades (reeds) positioned in a hermetically sealed glass tube with a gap between them and in a protective atmosphere.

• 一个磁簧开关是由两片特定形状且磁性强的(接触)叶片组成。此叶片被封装在一个装有保护气体的密玻璃管。里，而两叶片中间有一道间隔。