Electrical rocker switch comprising: - a base - knife contacts (4, 4a) being housed in spaces in the interior of the base, together with a moving contact, actuated by the rocker element situated above the appropriate closure cover of said base, - the lower part of the base has a V-shape and the base has four connection keys which are positioned, two by two, on the opposite sides of the base, by means of lateral cylindrical pins fitting in the interior of semi-cylindrical seats of the base in the sides of a corresponding aperture for each connection key, characterised in that: - said connection key has a cylindrical hollow on its external face, the bottom of said cylindrical hollow is next to the interior face of the key, said interior face is disposed in the shape of a fork and delimits an upper aperture wherein the front face of the corresponding knife contacts are situated, said front face is provided with apertures, said connection key is adapted to follow the following steps for connecting an electrical conductor wire to a knife contact (4, 4a) - the key comes from a first horizontal position to a second vertical position upon rotation of the key around its pins located in seats of the housing the key, - the conductor wire is inserted until the bottom of the cylindrical hollow of the connection key in said second vertical position, - the connection key is rotated around its pins located in seats of the housing, so that the front face of the knife contact (4, 4a) penetrates into the interior of the aperture of the connection key, the two sides of the aperture of said knife contact (4, 4a) on the cooper core of the conductor wire at the end of the rotation a final stable position where the external face is inclined towards the interior of the lower part of the base is achieved and the key is attached to the base by a stub being situated behind a spring by means for a clipping action, so that the conductor wire is suitably trapped by the knife contacts (4, 4a) and its detachment is prevented - a base - knife contacts (4, 4a) being housed in spaces in the interior of the base, together with a moving contact, actuated by the rocker element situated above the appropriate closure cover of said base, - the lower part of the base has a V-shape and the base has four connection keys which are positioned, two by two, on the opposite sides of the base, by means of lateral cylindrical pins fitting in the interior of semi-cylindrical seats of the base in the sides of a corresponding aperture for each connection key, - said connection key has a cylindrical hollow on its external face, the bottom of said cylindrical hollow is next to the interior face of the key, said interior face is disposed in the shape of a fork and delimits an upper aperture wherein the front face of the corresponding knife contacts are situated, said front face is provided with apertures, said connection key is adapted to follow the following steps for connecting an electrical conductor wire to a knife contact (4, 4a) - the key comes from a first horizontal position to a second vertical position upon rotation of the key around its pins located in seats of the housing the key, - the conductor wire is inserted until the bottom of the cylindrical hollow of the connection key in said second vertical position, - the connection key is rotated around its pins located in seats of the housing, so that the front face of the knife contact (4, 4a) penetrates into the interior of the aperture of the connection key, the two sides of the aperture of said knife contact (4, 4a) on the cooper core of the conductor wire