A contactor for medium voltage electric systems including: one or more electric poles; for each electric pole, a fixed contact and a corresponding movable contact reversibly movable between a first position, at which the movable contact is decoupled from the fixed contact, and a second position, at which the movable contact is coupled with the fixed contact; an electromagnetic actuator including a magnetic yoke having a fixed yoke member and a movable yoke member, the movable yoke member reversibly movable between a third position corresponding to the first position of the movable contacts, at which the movable yoke member is decoupled from the fixed yoke member, and a fourth position, corresponding to the second position of the movable contacts, at which the movable yoke member is coupled with the fixed yoke member, the electromagnetic actuator including an excitation circuit assembly including an excitation coil wound around the magnetic yoke and electrically connected with an auxiliary electric power supply to be fed with an excitation current to generate an excitation magnetic flux to move the movable yoke member from the third position to the fourth position or to maintain the movable yoke member in the fourth position; an opening springs operatively coupled with the movable yoke member to move the movable yoke member from the fourth position to the third position; a kinematic chain to operatively connect said movable yoke member with said movable contacts. The electromagnetic actuator including camping circuit assembly comprising a damping coil arranged to form a conductive loop adapted to be at least partially enchained with the excitation magnetic flux generated by the excitation current flowing along the excitation coil, when the auxiliary electric power supply provides the excitation current to the excitation coil, so that a secondary current circulates along the damping coil when the excitation magnetic flux is subject to a transient.

An electromagnetic actuator has: an armature carrying at least one coil; a ferromagnetic yoke configured to channel a magnetic flux created by the coil; and a ferromagnetic moving part that interacts with the yoke to form a magnetic circuit formed at least in part by an assembly of laminated metal plates, the moving part being configured to move in relation to the armature under the action of the magnetic field generated by the coil. The actuator moreover has an auxiliary magnetic circuit made of electrically conductive material, in order to permit the flow of currents induced in the auxiliary magnetic circuit when a magnetic field is generated by the coil.

An electromagnetic actuator has: an armature carrying at least one coil; a ferromagnetic yoke configured to channel a magnetic flux created by the coil; and a ferromagnetic moving part that interacts with the yoke to form a magnetic circuit formed at least in part by an assembly of laminated metal plates, the moving part being configured to move in relation to the armature under the action of the magnetic field generated by the coil. The actuator moreover has an auxiliary magnetic circuit made of electrically conductive material, in order to permit the flow of currents induced in the auxiliary magnetic circuit when a magnetic field is generated by the coil.

The electromagnetic relay includes a contact unit, an electromagnet, an armature unit, and a base. The contact unit includes a fixed contact and a movable spring including a movable contact. The armature unit is movable in accordance with excitation of the electromagnet to allow the movable contact to move between a closed position in contact with the fixed contact and an open position away from the fixed contact. The base holds the contact unit and the electromagnet on a certain surface side. The movable contact is placed between the base and the fixed contact in an arrangement direction in which the base and the electromagnet are arranged. The armature unit includes a press part which causes movement of the movable contact by applying a pressing force to a certain surface facing the fixed contact, of the movable spring.

A contact device includes a fixed terminal, a moving contactor, a moving yoke, and a bus bar. The moving contactor moves from a closed position where a moving contact is in contact with a fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The moving yoke moves, as the moving contactor moves, in a direction of movement of the moving contactor. The bus bar generates, when energized, a magnetic field having a direction aligned with the direction of movement of the moving contactor. The bus bar is arranged, with respect to the moving yoke when the moving contactor is currently located at the closed position, in a direction in which the moving contactor moves from the open position toward the closed position.

A contact device includes a fixed terminal, a moving contactor, a moving yoke, and a bus bar. The moving contactor moves from a closed position where a moving contact is in contact with a fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The moving yoke moves, as the moving contactor moves, in a direction of movement of the moving contactor. The bus bar generates, when energized, a magnetic field having a direction aligned with the direction of movement of the moving contactor. The bus bar is arranged, with respect to the moving yoke when the moving contactor is currently located at the closed position, in a direction in which the moving contactor moves from the open position toward the closed position.

A medium voltage circuit breaker includes: vacuum interrupters; and a drive, the drive being provided with a magnetic actuator with a yoke, and an anchor. At least the yoke or the anchor includes a movable part, the movable part of the drive being coupled to a movable part of a switch, and the yoke being provided with an actuation coil. The actuation coil can be driven actively by activation with electrical energy. The yoke is provided with at least one passive coil, which is coupled with the actuation coil only inductively, and with at least one permanent magnet, arranged inside or at the yoke, by which magnetic flux will be further concentrated and/or enhanced towards an airgap to the anchor.

A medium voltage circuit breaker includes: vacuum interrupters; and a drive, the drive being provided with a magnetic actuator with a yoke, and an anchor. At least the yoke or the anchor includes a movable part, the movable part of the drive being coupled to a movable part of a switch, and the yoke being provided with an actuation coil. The actuation coil can be driven actively by activation with electrical energy. The yoke is provided with at least one passive coil, which is coupled with the actuation coil only inductively, and with at least one permanent magnet, arranged inside or at the yoke, by which magnetic flux will be further concentrated and/or enhanced towards an airgap to the anchor.

An electromagnetic switch for a starting device of an internal combustion engine may include a coil carrier having a carrier wall enclosing a cavity, a coil winding, a piston, and a ferromagnetic bypass body. During operation, the coil winding may provide a magnetic field within the cavity. The piston may be disposed in a passive position and may be adjusted axially in a direction of a core. The coil winding may have a coil wire which may be wound around the carrier wall in a first winding direction and an opposing second winding direction. The ferromagnetic bypass body may surround the cavity and may be arranged radially between the cavity and the coil winding. In the passive position of the piston, the bypass body may axially overlap the axial gap. At least one winding of the second winding section may axially overlap the bypass body.

An electromagnetic switch for a starting device of an internal combustion engine may include a coil carrier having a carrier wall enclosing a cavity, a coil winding, a piston, and a ferromagnetic bypass body. During operation, the coil winding may provide a magnetic field within the cavity. The piston may be disposed in a passive position and may be adjusted axially in a direction of a core. The coil winding may have a coil wire which may be wound around the carrier wall in a first winding direction and an opposing second winding direction. The ferromagnetic bypass body may surround the cavity and may be arranged radially between the cavity and the coil winding. In the passive position of the piston, the bypass body may axially overlap the axial gap. At least one winding of the second winding section may axially overlap the bypass body.