Overload clutches, ratchet clutches and synchronous clutches are load separating safety clutches, i.e. they separate input and output completely in case of overload. Depending on the functional principle, however, the clutch re-engages in different ways.
Overload clutches do not re-engage automatically. The clutch must be re-engaged manually or via an additional device.
Ratchet clutches automatically re-engage after a certain angle of rotation, for example 15°.
Synchronous clutches also re-engage automatically, but only at a specific engagement point after a full rotation.