The invention relates to a cooling circuit, notably for a casing of an electrical equipment, comprising a first portion and a second portion, said first and second portions of the cooling circuit being complementary and respectively comprising hollow parts and projecting parts configured to fit one into the other so as to form by assembly a circulation channel for a coolant, said circulation channel being configured to generate a flow extending over different levels laid out successively one after the other along said circulation channel,
said hollow parts and said projecting parts being configured to fit one into the other thanks to a functional clearance enabling the imbrication of said hollow parts and said projecting parts, one at least of said first and second complementary circuit portions comprising at least one deflector configured to divert the coolant from said functional clearance.