A contactor comprising: - one or more electric poles; - for each electric pole, a fixed contact and a corresponding movable contact, the one or more movable contacts of said contactor being reversibly movable, along corresponding displacement axes mutually parallel and lying on a common displacement plane, between a first position, at which said movable contacts are decoupled from the corresponding fixed contacts, and a second position, at which said movable contacts are coupled with the corresponding fixed contacts; - a movable armature reversibly movable, along a corresponding displacement direction parallel to the displacement axes of said movable contacts, between a third position and a fourth position; - for each electric pole, a first plunger coupled with said movable armature and with a corresponding movable contact, each first plunger extending along a corresponding main longitudinal axis parallel or coinciding with the displacement axis of a corresponding movable contact; - an electromagnetic actuator comprising a magnetic yoke (41, 42) having a fixed yoke member and a movable yoke member, said movable yoke member being reversibly movable, along a corresponding displacement direction parallel to the displacement axes of said movable contacts, between a fifth position, at which it is decoupled from said fixed yoke member, and a sixth position, at which it is coupled with said fixed yoke member, said electromagnetic actuator further comprising a coil wound around said fixed yoke member and adapted to be fed by a coil current to make said fixed yoke member to magnetically interact with said movable yoke member and generate a force to move said movable yoke member from said fifth position to said sixth position or maintain said movable yoke member in said sixth position; - a pair of opening springs coupled with said fixed yoke member and said movable yoke member, said opening springs being adapted to provide a force to move said movable yoke member from said sixth position to said fifth position; - a pair of second plungers coupled with said movable yoke member and said movable armature, each second plunger extending along a corresponding main longitudinal axis parallel with the displacement axes of said movable contacts; wherein said fixed yoke member and said movable yoke member are arranged respectively at a proximal position and a distal position with respect to said movable contacts, wherein said second plungers are symmetrically positioned with respect to a main symmetry plane of said contactor, which is parallel to the displacement axes of said movable contacts and perpendicular to the displacement plane of said movable contacts, wherein said opening springs are symmetrically positioned with respect to said main symmetry plane, characterised in that said fixed yoke member comprises a pair of through holes, each of said second plungers being inserted in a corresponding through hole and passing through said fixed yoke member. - one or more electric poles; - for each electric pole, a fixed contact and a corresponding movable contact, the one or more movable contacts of said contactor being reversibly movable, along corresponding displacement axes mutually parallel and lying on a common displacement plane, between a first position, at which said movable contacts are decoupled from the corresponding fixed contacts, and a second position, at which said movable contacts are coupled with the corresponding fixed contacts; - a movable armature reversibly movable, along a corresponding displacement direction parallel to the displacement axes of said movable contacts, between a third position and a fourth position; - for each electric pole, a first plunger coupled with said movable armature and with a corresponding movable contact, each first plunger extending along a corresponding main longitudinal axis parallel or coinciding with the displacement axis of a corresponding movable contact; - an electromagnetic actuator comprising a magnetic yoke (41, 42) having a fixed yoke member and a movable yoke member, said movable yoke member being reversibly movable, along a corresponding displacement direction parallel to the displacement axes of said movable contacts, between a fifth position, at which it is decoupled from said fixed yoke member, and a sixth position, at which it is coupled with said fixed yoke member, said electromagnetic actuator further comprising a coil wound around said fixed yoke member and adapted to be fed by a coil current to make said fixed yoke member to magnetically interact with said movable yoke member and generate a force to move said movable yoke member from said fifth position to said sixth position or maintain said movable yoke member in said sixth position; - a pair of opening springs coupled with said fixed yoke member and said movable yoke member, said opening springs being adapted to provide a force to move said movable yoke member from said sixth position to said fifth position; - a pair of second plungers coupled with said movable yoke member and said movable armature, each second plunger extending along a corresponding main longitudinal axis parallel with the displacement axes of said movable contacts;