The Fichet-Bauche Inviktus came first: Fichet-Bauche's iconic flagship, certified against burglary, fire and explosion. At the request of the banking sector, the Fichet-Bauche Atrius was developed from it.
The Atrius is fully tested and certified against burglary according to EN 1143-1 (Grade 4 or 5), but is not fire or explosion resistant. For applications where that additional protection is not required — such as many banking and professional environments — the Atrius offers the same certified burglary resistance at a more attractive price.
In short: choose the Inviktus for complete protection against burglary, fire and explosion; choose the Atrius when certified burglary resistance suffices.