RCCB are avaliable as current setting, some are fixed and some such as Merlin Gerin are can be set on amp trip eg 45amps 500ma
just one example
http://www.merlin-gerin.com/MG/en/products/index_fon1_fam57_M9_DPN_Vigi.htm
we always get rccb's with overload protection, if you do not ask for...