TXL, GXL and SXL are three common types of automotive wires, which differ in terms of material, performance and application scenarios. The following is a detailed comparison of them and a guide for selecting automotive wires:

I. Differences between TXL, GXL, and SXL

Key differences

1.TXL Wire

• The thinnest outer diameter and insulation layer make it suitable for modern cars with limited space (such as areas with dense electronic modules).
• Under the same cross-sectional area, it saves 20% to 30% of space compared with GXL/SXL.

2. GXL Wire

• Balanced design, widely used in most automotive wiring harnesses, with high cost performance.

3. SXL Wire

• It has the thickest insulation layer and strong resistance to mechanical wear, making it suitable for high-temperature and high-vibration areas such as engine compartments.

II. Key Points for Selecting Automotive Wires

1. Current load (cross-sectional area)

• Select the cross-sectional area of the conductor (such as 0.5mm², 1.0mm², 2.5mm², etc.) according to the current size, and refer to ISO 6722 or SAE J1128 standards.
• For example, in a 12V system, a 1.0mm² wire can carry approximately 10A of current (for short distances).

2. Temperature resistance requirements

• Engine compartment: Select models that can withstand temperatures above 125°C (such as SXL).
• Interior of the carriage: TXL/GXL (resistant to 105°C to 125°C) is sufficient.

3. Environmental adaptability

• Oil resistance/chemical corrosion resistance: Cross-linked polyethylene (XLPE) insulation materials (TXL/GXL/SXL all meet the requirements) are preferred.
• Waterproof: It is necessary to use waterproof connectors or select special sheaths (such as GPT type wires).

4. Mechanical stress

• For high-vibration areas (such as the chassis), SXL or braided shielding layers should be selected.
• For high flexibility requirements (such as door wiring harnesses), TXL can be selected.

5. Standard certification

• Complies with SAE J1128 (American standard), ISO 6722 (international standard) or national standard GB/T 25085/25087.

6. Cost and space

• For compact design, choose TXL; for regular applications, choose GXL; and for high reliability requirements, choose SXL.

III. Other common types of automotive wires

1. GPT: General-purpose type, with a relatively thick insulation layer, resistant to 105°C, used in non-high-temperature areas.
2. HDT: Heavy-duty wire, resistant to high temperatures up to 150°C, used in high-voltage systems of hybrid/electric vehicles.
3. Coaxial Cable: Used for radio frequency signals (such as GPS, antennas).

IV. Example of Selection Process

1. Determine the circuit current → Select the cross-sectional area.
2. Analyze the environment (temperature, oil contamination, vibration) → Select TXL/GXL/SXL.
3. Verify whether it complies with the vehicle manufacturer's standards (such as German VW 60306, Japanese JASO).

Through the above steps, a balance can be achieved among the safety, reliability and cost of the wires.