The invention proposes a switch (10) comprising a bottom contact-holder (12) supporting two fixed electric contacts (30, 30B), an actuation member (54) and an intermediate conductive contact strip (14) that can be deformed elastically in order to modify the electric connection between the two fixed contacts (30, 30B) and that comprises two opposite longitudinal branches (40) connected to the fronttransverse contact arm (38B), characterized in that each branch (40) is curved and the switch comprises an actuation plate (16) which is interposed between the actuation member (54) and the contact strip (14) and which interacts with the tops (64) of the longitudinal branches (40) to deform the contact strip (14).