Abstract: A clutch which can be incorporated into a rotating drive train between a driving part and driven part includes a locally fixable coil housing with an integrated electromagnet coil, a positioning unit which is mounted rotatably in the coil housing and can be connected to the driving part and has an inner, two-stage, saw-tooth-like retaining toothing and a saw-tooth-like actuating toothing frontally opposite the latter, an axially displaceable coupling unit which is actuated under the influence of the electromagnet coil and of a resilient restoring force and has an incorporated, rotatable thrust ring including two saw-tooth-like serrations, and driven flange which can be coupled to the coupling unit via crown toothings on the end side and can be connected to the driven part.