The contactor comprises a fixed contact plate (14), a moveable contact plate (16) and means for retaining the two contact plates (14, 16). The moveable contact plate (16) is resiliently deformable between a position remote from the fixed contact plate (14) and a position in contact with the fixed contact plate (14). The retaining means comprise an adhesive insulating sheet (18) which is interposed between the two contact plates (14, 16), which sheet (18) adheres along the two opposing faces thereof to each of the two contact plates (14, 16).
