Pushing 500 amps through a hand-held connector is, on paper, an unreasonable thing to ask a piece of consumer hardware to do.
The mass problem
A passively cooled 500-amp cable would weigh roughly 4.2 kilograms per metre. At a usable five-metre length that is 21 kilograms, heavier than most checked airline luggage.
How the loop works
Inside the Combo Rapid jacket runs a sealed circuit of dielectric fluid, driven by a brushless pump in the base of the connector. The fluid absorbs heat from a finned aluminium sleeve, then dumps it through a low-profile radiator in the strain-relief boot. The whole loop is hermetically welded, so there is nothing to service for the life of the product.
Engineering is the discipline of choosing which compromise you are willing to live with.
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