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What do automotive wiring harness connectors mean by 2.3mm, 4.2mm and 6.3mm?

Difference of nominal cross section of commonly used fuses. Automotive wiring harness connectors, also known as connectors, are often used in automobile circuits. "2.3mm, 4.2mm, 6.3mm" refers to the cross-sectional area of fuses, indicating the difference between the nominal cross-sectional areas of commonly used fuses.