Should connector insulation resistance be as low as possible?

Connector insulation resistance should not be as low as possible. On the contrary, it should be as high as possible to ensure safe and stable electrical performance. Insulation resistance refers to the resistance between conductive parts inside the connector or between contacts and the insulating housing. A higher insulation resistance means better isolation between circuits and lower leakage current.

If insulation resistance is too low, electrical leakage may occur, causing signal interference, unstable transmission, short circuits, or equipment damage. In high-speed communication devices, automotive electronics, industrial control systems, and medical equipment, low insulation resistance can seriously affect signal integrity and overall system reliability.

High insulation resistance also improves safety in high-voltage environments. It helps prevent electrical breakdown, arcing, and overheating, especially under humid, dusty, or high-temperature conditions. Therefore, connectors used in harsh environments usually require very high insulation resistance values.

The insulation performance of a connector mainly depends on insulating materials such as PPS, LCP, or PBT, as well as connector structure and manufacturing quality. Most high-quality connectors have insulation resistance values reaching hundreds or thousands of megaohms (MΩ).

In summary, connector insulation resistance should be maintained as high as possible within design standards to reduce leakage, improve signal stability, and ensure long-term operational safety.