    (1) Look at the electrical appliances. Look at the use of several electrical appliances (such as electric motors, electric arc furnaces, etc.), their type, use, wiring and some different requirements.
    (2) Look at the control components of the appliance. For example, the motor M in Fig. 1-8 is controlled by the KM2-KM4 three sets of contacts of the KM relay to start and stop.
    (3) Look at components other than electrical appliances. What do these components do in the circuit? For example, in Fig. 1-8, the main circuit is divided into an electric three-phase asynchronous motor M. There are also KM2~KM4 main contacts, knife switch QK, thermal relay KR thermal components and fuses FU1 - FU3.
    (4) Look at the power supply. To understand whether the main circuit uses a power supply of 380V or 220V AC power supply.
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Yangzhou Qianyuan Electric Equipment Manufacturing & Trade Co.Ltd , https://www.qypowerline.com