1. Insulation resistance is an indicator of the insulation performance between contacts of electrical connectors and between contacts and enclosures, in the order of hundreds of megaohms to several gigaohms.

2. High quality electrical connectors with contact resistance should have low and stable contact resistance. The contact resistance of the connector ranges from a few milliohms to tens of milliohms.

3. The electric strength or the withstand voltage and the dielectric withstand voltage are the ability to characterize the rated test voltage between the connector contacts or between the contacts and the casing.

4. Other electrical properties.