An electrical device (2, 202) designed to operate at a high ambient operating temperature (Ta), i.e. above 190°C, preferably above 250°C, more preferably above 600°C, comprising: a first electrical component; a second electrical component; and at least one conductive electrical connection, connecting the first and second electrical components (4, 6), including: - a first metal element (10, 210) having a first end (12, 212) electrically connected to the first electrical component and a second end (14, 214); - a second metal element (16, 216) having a third end (18, 218) electrically connected to the second electrical component and a fourth end (20, 220); and - an electrical connection means, having an electrically insulating support plate, and connecting the second end (16, 216) of the first metal element (10, 210) and the fourth end (20, 220) of the second metal element (16, 216) by a weld joint deposited on the support plate, the weld joint having a melting temperature (Tf) lower than the ambient operating temperature (Ta) of the electrical device (2, 202); at least one of the first and second electrical components (4, 6) and the or each electrical connection being designed to operate at said ambient operating temperature (Ta); characterized in that the electrical device (2, 202) comprises: a cement deposited to cover the entire exposed weld joint, and to cover, while adhering thereto, a first surface zone (30, 230) of the support plate adjacent to a second zone (32, 232) of the support plate in contact with the weld joint, a third surface zone (34, 234) of the first metal element (10, 210) adjacent to a fourth surface zone (36, 236) of the first metal element (10, 210) included in the weld joint, and a fifth surface zone (38, 238) of the second metal element (16, 216) adjacent to a sixth surface zone (40, 240) of the second metal element (16, 216) included in the weld joint, the material of the cement being chosen to maintain its adhesion on the first zone (30, 230), the third zone (34, 234) and the fifth zone (38, 238) and its tightness with respect to the weld joint when the ambient operating temperature is applied to the electrical device (2, 202). a first electrical component; a second electrical component; and at least one conductive electrical connection, connecting the first and second electrical components (4, 6), including: - a first metal element (10, 210) having a first end (12, 212) electrically connected to the first electrical component and a second end (14, 214); - a second metal element (16, 216) having a third end (18, 218) electrically connected to the second electrical component and a fourth end (20, 220); and - an electrical connection means, having an electrically insulating support plate, and connecting the second end (16, 216) of the first metal element (10, 210) and the fourth end (20, 220) of the second metal element (16, 216) by a weld joint deposited on the support plate, the weld joint having a melting temperature (Tf) lower than the ambient operating temperature (Ta) of the electrical device (2, 202); - a first metal element (10, 210) having a first end (12, 212) electrically connected to the first electrical component and a second end (14, 214); - a second metal element (16, 216) having a third end (18, 218) electrically connected to the second electrical component and a fourth end (20, 220); and - an electrical connection means, having an electrically insulating support plate, and connecting the second end (16, 216) of the first metal element (10, 210) and the fourth end (20, 220) of the second metal element (16, 216) by a weld joint deposited on the support plate, the weld joint having a melting temperature (Tf) lower than the ambient operating temperature (Ta) of the electrical device (2, 202); at least one of the first and second electrical components (4, 6) and the or each electrical connection being designed to operate at said ambient operating temperature (Ta); characterized in that the electrical device (2, 202) comprises: a cement deposited to cover the entire exposed weld joint, and to cover, while adhering thereto, a first surface zone (30, 230) of the support plate adjacent to a second zone (32, 232) of the support plate in contact with the weld joint, a third surface zone (34, 234) of the first metal element (10, 210) adjacent to a fourth surface zone (36, 236) of the first metal element (10, 210) included in the weld joint, and a fifth surface zone (38, 238) of the second metal element (16, 216) adjacent to a sixth surface zone (40, 240) of the second metal element (16, 216) included in the weld joint, the material of the cement being chosen to maintain its adhesion on the first zone (30, 230), the third zone (34, 234) and the fifth zone (38, 238) and its tightness with respect to the weld joint when the ambient operating temperature is applied to the electrical device (2, 202).