What are the common causes of increased contact resistance in connectors?

The common causes of abnormally high contact resistance in connectors include:

1. Surface contamination

Oxide layers, oil, dust, or other contaminants on the contact surface reduce conductivity and increase resistance.

2. Wear or damage of plating

Plating wear, peeling, or degradation reduces the effective conductive contact area.

3. Insufficient contact pressure or misalignment

Poor assembly, loosening, or positional deviation leads to incomplete or unstable contact.

4. Material fatigue or deformation

Long-term use may cause elastic fatigue or deformation of contact springs, reducing contact force.

5. Environmental stress (vibration, temperature, humidity)

Mechanical vibration and environmental changes accelerate micro-motion wear and oxidation, further increasing contact resistance.