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

A passive device for protection of electrical junction box of a low voltage (LV) power supply to a building from undesirable elevated temperature or flame burns, characterized by

• a tank (5) with extinguishing medium,
• a plunger (6) arranged in an opening in an upper part of the tank (5) and immersed in the tank (5), wherein the plunger (6) includes a seal for sealing the extinguishing medium in the tank (5),
• a NC contact (4) is attached to the upper part of the plunger (6) and made from electrically conductive material,
• a thermal fuse (7) attached to the upper part of the plunger (6), and
• a protective frame (8) arranged above the thermal fuse (7) and rigidly attached to a carrier (10),
• wherein 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,
• wherein the first part (10.1) of the carrier (10) and the second part (10. 2) of the carrier (10) form single compact unit,
• wherein at least one supply contact (2a) and at least one branching contact (2b) are arranged at an end of the first part (10.1) of the carrier (10) and an output contact (3) is arranged at an end of the second part (10.2) of the carrier (10).