The invention relates to an electrical system comprising:a power module (100) comprising a power stage (102), at least one cooling unit (106) of the power stage (102) by circulation of heat transfer fluid, the cooling box (106) comprising a first passage (108) of coolant and a second passage (110) of heat transfer fluid,characterized in that the cooling casing (106) further comprises, on the first passage side (108), a first attachment system (114) and, on the second passage side (110), a second attachment system (116)in that the electrical system further comprises at least one connection (202) comprising a first heat transfer fluid passage (204) and a second heat transfer fluid passage (206),in that the connector (202) further comprises, on the side of the first passage (204), a first fastening system (210) and, on the side of the second passage (206), a second fastening system (212) ,in that the first fastening system (210) of the coupling (202) and the second fastening system (116) of the cooling box (106) are complementary to one another so as to be able to hold the first passage (204) of the connector (202) connected to the second passage (110) of the cooling case (106),and in that the second fastening system (212) of the coupling (202) and the first fastening system (114) of the cooling box (106) are complementary to one another so as to be able to maintain the second passage (206) of the connector (202) connected to the first passage (108) of the cooling housing (106).
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