The present invention relates to a single-pole or multi-pole switch to be used preferably in low-voltage systems. The switch (1) comprises an outer casing (2) containing for each pole at least one fixed contact (10) and one mobile contact (20) which can be reciprocally coupled to/uncoupled from each other. The mobile contacts (20) are housed in suitable seats (25) provided on a mobile element (50). The switch (1) according to the invention is provided with a control mechanism (60, 61) comprising mechanical means supported by a structural part (70). This control mechanism (60, 61) is connected to the mobile element (50) through first removable connection means (64) and to the outer casing (2) through second removable connection means (65). The switch (1) also comprises means to support the mobile element (50) which are connected to the structural part (70) of the control mechanism (60, 61) through third removable connection means (66).