The four-channel MBD40-T0415/EX/000 multibarrier enables the connection of a large number of field devices to one Profibus PA fieldbus in the Ex area, according to IEC 61158-2. Each 4 channel multibarrier can take four Ex i field devices.

Up to 16 Ex i field devices can be connected to the bus. Ex e fieldbus supply (High Power Trunk Concept), which is looped through from multibarrier to multibarrier, allows to augment the number of subscribers. In order to limit inrush currents at the moment of turn-on, the drop lines/spurs are switched on one after the other.

Inputs and outputs of the trunk line feature increased safety protection (Ex e) and the spurs to the field devices are intrinsically safe (Ex i). The Ex e bus cables and the Ex i outputs are galvanically separated.  The field devices can be supplied with a maximum of 40 mA. Each spur is short-circuit protected through 50 mA current limitation. Altogether, a maximum of 160 mA is available for nominal operation.

Integrated terminating resistors can be activated optionally. The enclosure is die-cast aluminium, powder paint coated with pressure compensation element for condensation protection and has an external M5 bolt for earthing.