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If the circuit breaker is still tripping in and out with the power window relay removed your problem is not with the electric windows.
That circuit breaker also provides protection for central locking, power seats, sunroof and I’m sure there’s something else I can’t remember at the moment. The wiring is still there even if these items aren’t fitted to your vehicle.
I would start by checking the wiring harness for the power seats under both front seats. Make sure it’s not damaged or been caught in the seat runners.