(57) Four knife contacts -4- and -4a- are represented, together with the moving contacts
-8-, actuated by swinging elements -11-, situated above the closure cover - 12- of
the base -1-, characterized in that is has four connection keys -2-, two by two, situated on the sides opposite the base
-1-, V-shaped, its lateral cylindrical pins -17-resting axially on semi-cylindrical
seats -18- of the base -1- on the side of housings - 3-. Thus, each connection key
-2- can swing from the horizontal position prior to placement until the vertical starting
position of the connection of the wire conductor - 19-, said key -2- being in this
vertical position until the bottom of a cylindrical hollow -20- of the connection
key -2-. The key -2- has the end of its lower face -22- in a fork shape, which delimits
an upper aperture -23- wherein the front face of the corresponding knife contact -4-
and -4a- is situated, a face provided with an aperture -4b-. Additionally, the key
-22- has two buffers, one stub -24- inside a slot -25- of the base -1- and another
-26-, below stub -24-, located outside of the edge of the base - 1-. Said connection
key -2- is situated on the lower part of the V of the base -1-, and has a stub -27-,
resting against a spring -28- and positioned by means of a clipping action. The base
-1- has four teeth -13-, two by two, which fit into slots -14- in the cover -12-,
base and cover remaining held shut and the mechanism closed.
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