The ATEX-approved Route-Master system consists of up to eight Trunk Isolator Modules in a 19inch rack, each connected to one or more RM100 Fieldbus Device Couplers. The combination is approved suitable for any mix of Fisco and Entity field devices. The RM100 Rack incorporates hot-swappable and load-sharing redundant DC power cards and full galvanic isolation. Route-Master allows the full Foundation Fieldbus network length of 1,900m, and 120m spurs, double the normal Fisco restrictions.