The same busbar section can run at very different temperatures as current, duty cycle, airflow and ambient conditions change. A design review should define the thermal boundary before selecting the conductor and terminal geometry.
Model module connections separately from cabinet bars
Internal module connections are constrained by device spacing and reflow; cabinet bars are constrained by creepage, service safety and mechanical support. Record current, length, number of interfaces, airflow or coolant conditions for each region instead of transferring cabinet data to the module.
Check interfaces in laminated and liquid-cooled structures
Laminated busbars shorten loops but insulation films, end compression and layer tolerances change the thermal path. Liquid-cooled bars add cold-plate flatness, sealing grooves, coolant compatibility and service loads. Copper-aluminum transitions need moisture and galvanic protection.
- Test temperature rise at minimum airflow and worst ambient
- Compare millivolt drop and torque retention at every interface
- Define leak and dielectric tests as separate acceptance gates
Make procurement and acceptance measurable
State thickness, insulation stack-up, end plating, hardware, allowable rise, cooling condition and sampling plan in the RFQ. Prototype acceptance should retain thermal images, voltage drop, dimensions, dielectric and vibration results rather than relying on appearance alone.