Abstract: A safety connection device for connecting a high rupture capacity fuse link to a switching device and includes at least one connecting element having one opening receiving a guide carrying a cable from the switching device and another opening which receives the fuse link, and a contact spring and a contact bracket connected to each other and also connected to the fuse link and to the end of the cable inserted into the connecting element, respectively. The diameter of the opening receiving the fuse link is substantially greater than that of the fuse link.

Abstract: An arrangement for mounting single-pole load-disconnecting switches in a middle voltage net includes a plurality of conventional, individually switchable load-disconnecting switches mounted on a single common base frame enclosed with a common housing. All the switches are arranged on individually rotatable hubs positioned on a common central shaft journalled in the base frame. Each hub establishes the connection between the associated load-connecting switch and a respective drive. Each switch is additionally provided with a support which carries a high voltage-high efficiency safety device.

Abstract: An HRC-fuse as an insulating body surrounding a main fusible conductor and an auxiliary fusible conductor connected to a spring biased impact pin. A conductive cap serving as a terminal for the fusible conductors is arranged on the insulating body and is provided with an outlet opening opposite the impact pin. A tripping hollow pin or sleeve coaxially surrounds at least a part of the impact pin and passes through the outlet opening. A bimetal release pawl is arranged in the one cap parallel to the pin and being electrically connected to the fusible conductors. The pawl engages a rest on the tripping sleeve to counteract a biasing spring. The impact pin and the tripping sleeve are triggered independently one from the other either by a short-circuit current melting the auxiliary conductor, or by an overload which heats up the bimetal release and triggers the sleeve. Both the tripping sleeve and the impact pin act on a load interruptor arranged opposite the outlet opening.