The new 3-phase solid-state contactors are, for example, used in conveyor technology applications for the switching and reversing of parcel conveyor belts or palleting machines. Also these devices offer a quiet switching behavior and are therefore suitable for all noise-sensitive applications. Thanks to their integration in the SIRIUS modular system, the solid-state contactors can be easily extended to assemble complete motor feeders. The terminals in the main circuit are designed in a way which allows for the devices’ connection to a SIRIUS motor starter protector by means of a conventional link module. For a fast and compact assembly of fuseless motor feeders. Alternatively, also fused motor feeders can be realized by simply mounting a solid-state SIRIUS overload relay to the outputs of the solid-state contactor.