Why 800VDC Power Architecture Needs a New Generation of Power Blade Connectors
As AI compute racks scale to 100kW and beyond, the power shelf interconnect must handle far higher current density. Here is what changes.
Connector Reliability in EV Charging: Why Contact Resistance Matters Most
In high current charging, milliohm-level differences translate into degrees of temperature rise. Here is how to specify for long service life.
Energy loss in a connector contact is I²R. At 250A, a contact resistance of 0.5 mΩ dissipates over 30W at the joint — which in a sealed connector housing with limited convection surface produces a rapid temperature rise that accelerates contact wear and, in severe cases, causes thermal failure.
What actually degrades
- Contact resistance drift caused by normal insertion cycles wearing the plating;
- Oxidation and sulfide formation on the mating interface when the connector is not fully mated;
- Thermal cycling fatigue in the spring beam, reducing normal force over time.
Specification checklist
When specifying a high current charging connector, we recommend evaluating: contact resistance after environmental exposure (not merely initial value), minimum insertion cycles at rated current, plating thickness and type, temperature rise at rated load with the specified wire size, and the mating/unmating force window.
Our JDC series publishes resistance after environmental exposure alongside a temperature-rise curve, so engineers can model the thermal behaviour rather than relying on a single datasheet number.