The crj has no authotrust.
No autothrust= No Cat 3b.
they are cat 2. and the minima depend from airport to airport, you find them on the cat2 ils plate for the airport.
the minimima for cat3A and cat3B you find them on the text manual of the jeppesen plates. usually 50 feet DH and 200 mt RVR for cat3A, and NO DH and 75 mt RVR for cat 3B.