Passive device for protection of the electrical junction box of the LV power supply to a building from undesirable elevated temperature or flame burns

Abstract

Passive device for protection of the electrical junction box of the LV power supply to a building from undesirable elevated temperature or flame burns contains a tank (5) with extinguishing 5 medium, plunger (6) arranged in the opening in the upper part of the tank (5) and immersed in the tank (5). The plunger (6) includes a seal for sealing the extinguishing medium in the extinguishing medium tank (5). A NC contact (4) is attached to the upper part of the plunger (6), made from electrically conductive material, and furthermore a thermal fuse (7) is attached to the upper part of the plunger (6). A protective frame (8) is arranged above the thermal fuse (7) 10 and rigidly attached to a carrier (10). The passive device for protection of the electrical junction box is arranged in the first part (10.1) of the carrier (10), and in the second part (10.2) of the carrier (10) a fuse is arranged in the fuse base (1) for protecting the electrical circuits in the building against short circuit and overload. The first part (10.1) of the carrier (10) and the second part (10. 2) of the carrier (10) form a single compact unit, wherein at least one supply 15 contact (2a) and at least one branching contact (2b) are arranged at the end of the first part (10.1) of the carrier (10) and an output contact (3) is arranged at the end of the second part (10.2) of the carrier (10).