Abstract: The present invention relates to an electrical circuit arrangement, in particular an electrical signal circuit arrangement and preferably a signal lamp which is used in hazardous areas. The circuit arrangement is equipped with at least one electrical component (1) which is arranged on a printed circuit board (2) produced from a heat-conducting material. The electrical component (1) is, in particular, a luminous means (1). A cooling device (6, 7) which is in thermal contact with the printed circuit board (2) is also realized. According to the invention, the cooling device (6, 7) is in at least two parts, with a heat sink (7) and at least one heat pipe (6). In this case, the heat pipe (6) thermally connects the printed circuit board (2) to the heat sink (7).

Abstract: A telephone has a housing, a handset, and a cradle on the housing constructed to transmit and emit light and fit with the handset. A light source in the housing juxtaposed with the cradle can be energized to feed light into the cradle for emission thereby. The light source can be LEDs mounted on a printed-circuit board underneath a base plate carrying the light-conducting cradle.

Abstract: An explosion-protected plug-in connector, particularly for coupling of a VoIP telephone with a network, has at least one housing and at least one first electrical connector unit in the housing. At least one conductor end section of the network engages into the connector unit. Supplemental to the first electrical connector unit, which is configured as an IDC terminal unit, there is at least one further second IDC terminal unit provided in the housing. The conductor end section engages into the two IDC terminal units. A hold-down disposed between the two IDC terminal units is provided for the conductor end section.

Abstract: A signal device, particularly for use in areas at risk of explosion, has a housing, at least one light source, and at least one acoustics source. A sound guidance unit follows the acoustics source with its neck opening and emits the sound produced by the acoustics source to the outside, by way of its mouth opening. The sound guidance unit not only serves to guide sound, but at the same time takes on an optical signal function.