A domestic appliance such as a cyclonic vacuum cleaner includes a component such as separating apparatus, carried by a chassis. A catch is provided and is operable to release the component from the chassis. The component and the chassis are able to move slightly with respect to each other. When the appliance is lifted, lugs on the separating apparatus move into slots on the chassis so as to inhibit release of the catch when the appliance is lifted. Thus, accidental release of the separating apparatus from the chassis is avoided.