Abstract : This paper scientifically classifies different reed structures in polarized magnetic system relays according to the formation law of reed reaction characteristics. Evaluating the performance of reed systems using "complete reaction characteristics," including unilateral reed reaction characteristics, is beneficial for in-depth research on reed systems and can be used to guide the design and quality control of relay reed systems. Keywords : Reaction characteristics, reed system, polarized magnetic system, relay. Relay reed structures vary greatly and are numerous. For a long time, there has been no scientific classification method, which has to some extent restricted further in-depth research. This paper argues that classifying reeds according to the formation law of their reaction characteristics (including composite and unilateral characteristics) can cover reeds with different structures using their reaction characteristics, which is beneficial for further in-depth research. Therefore, a classification method based on the principle structure of reaction force characteristics is proposed, referred to as the "characteristic classification method." Based on this, the corresponding reaction force characteristics are summarized and systematized. The reaction force characteristic of a polarized magnetic system relay has a zero-crossing equilibrium point (or equilibrium region). The reaction torque has opposite signs on both sides of the equilibrium point; that is, it presents as a reaction force on the operating side, while on the releasing side, its torque is in the same direction as the electromagnetic torque of the operating force. This differs from electrical appliances in ordinary magnetic systems. Nevertheless, the reed characteristic is still traditionally called the "reaction force characteristic." For similar composite reaction force characteristics, their unilateral characteristics (hereinafter referred to as "sub-characteristics") can be of different types, but they all affect the reliability and lifespan of the relay. I. Principle Structure Analysis of the Reed System According to their reaction force characteristics, the reed systems of polarized magnetic systems can be divided into two categories based on the driving of the moving reed: direct drive and push rod (hereinafter referred to as "push rod") drive [1]. The former directly fixes the moving reed to the armature, while the latter drives the reed through a push rod welded to it. Furthermore, considering the prestress of the moving reed, the direction of the driving force on the moving reed, and the contact state without driving force, which affect its characteristics, various complex reed systems can be classified according to the classification principles shown in Table 1. The corresponding principle structures are shown in Figures 1, 2, and 3. Regardless of their specific structures, reed systems with the same driving and state characteristics possess the same type of reaction force characteristics. This classification method based on the principle structure of reaction force characteristics is called the "characteristic classification method." [b][align=center]For more details, please click: Classification of Polarized Magnetic System Relay Reed Systems[/align][/b]