Abstract: A human-machine interface comprises a return mechanism for returning a utensil to its neutral position. The return mechanism comprises a rocker suspended on first and second springs. This rocker is rotatable about a second axis and comprises first and second side-wings that are each situated on a respective side of a median plane containing a first axis about which the utensil rotates. These first and second side-wings comprise first and second regions for accommodating one end of the first and second springs, respectively, the orthogonal projection of the second accommodating region, in a plane containing the first and second axes, being situated entirely between the first and second axes.

Abstract: A device for connection of multiple switchgear devices having a first connection plane including at least one plug-in socket for receiving a switchgear device pluggable in a plug-in direction. The device includes a second protection plane with a removable cover having at least one opening for the control means of a device to pass through. The removable cover also includes at least a first pressing area for pressing against a second pressing area of at least one switchgear device, pressing of the first pressing area on the second pressing area at the time the removable cover is positioned providing a holding force for the at least one switchgear device.

Abstract: A system for multiple connection of switchgear devices comprising a first connection plane comprising at least one plug-in socket designed to receive a switchgear device pluggable in a plug-in direction. Said system comprises a second protection plane comprising a removable cover provided with at least one opening for the control means of said switchgear device to pass through. The removable cover comprises at least a first pressing area designed to press against a second pressing area of at least one switchgear device, pressing of the first pressing area on the second pressing area at the time the removable cover is positioned providing a holding force of said at least one switchgear device.