Take you to understand the structure and working principle of AC electromagnetic relay RF sensor

　　The form of contact is generally divided into three types: one is the static contact of the relay RF sensor coil when it is not powered on, which is called the normally closed contact, represented by the letter H; The normally closed contact is broken by the closed state when the coil is powered on, so it is also called the breaking contact, and the normally open contact 7-2 is the moving contact. There are two kinds of switching contacts, namely, the switching contact that is made before breaking and the switching contact that is made after breaking. Figure 7-2 lists the circuit in the form of contacts. In a structure, the working principle of a relay RF sensor may have one or more (groups) of normally open contacts and corresponding conversion contact forms. The second is the static contact in the disconnected state, called normally open contact, represented by the letter D; There is also a moving contact structure, the working principle is normally closed with a static contact, and at the same time is normally open with a static contact, forming an open and closed conversion contact form, represented by the letter I.

　　Thus, the armature is attracted to the core under the action of electromagnetic suction, and at this time, the armature drives the support rod to push the plate spring away, so that the two normally closed contacts are disconnected. When the current of the relay RF sensor coil is disconnected, the core loses its magnetism, the armature restores its initial state under the action of the plate spring, and the contact is closed again.

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