The form of electrical graphic symbols is divided into 2 main categories:
I. Graphic symbols
1. Basic symbols
2. General symbols
3. Detailed symbols
4. Derived symbols
Two. Textual symbols
1. Basic textual symbols
(1) Single-letter symbol
(2) double-letter symbols
2, auxiliary text symbols
Electrical schematic diagram labeling
Commonly labeled: QS knife switch, FU fuses, KM contactors, KA intermediate relays, KT time relays, KS speed relays, FR thermal relays, SB buttons, SQ Travel switches.
Component technical data
(1) Electrical component breakdown: component name, symbol, function, model, quantity, etc..
(2) Note in small font next to the graphic symbols in its electrical schematic diagram.
Reference: Baidu Encyclopedia-Electrical Schematic Diagram