Switches and push-buttons are components for switching consumers in industrial, commercial and private electrical installations, such as switch-disconnectors, impulse relays (remote switches) and main switches. Fuse switch-disconnectors combine fuse protection of system parts with switching capability under load as well as when in overload. Tytan II series devices are main fuse switch-disconnectors for D01 and D02 fuses. Simultaneous isolation of all phases is ensured by the screwcap-less plug-in technology. In contrast to the earlier screwcap technology, in which perfect contact could not be guaranteed, the mechanics of the series prevent the formation of high transitional resistances and therefore minimise thermal dissipation power. Selective miniature circuit-breakers (LSL switches) are current-limiting, mechanical switching devices without active electronic components. They are able to switch on, direct and switch off currents under operation-relevant conditions. Fuse switch-disconnector switches do not immediately switch the current if a short-circuit occurs like other miniature circuit-breakers, but instead is delayed so that selectivity for downstream fuses and normal miniature circuit-breakers is ensured.