A relay includes a contact container including a yoke plate and an insulating cover connected with the yoke plate to form a contact chamber; a pair of static contact leading-out terminals passing through a pair of first through holes of the insulating cover; a fixing member within the contact container and fixedly connected with the yoke plate; a movable member within the contact chamber and including a movable contact piece configured to come into contacted with or separated from the pair of static contact leading-out terminals; a moving part movable connected to the fixing member; and a first magnetizer connected with the moving part. The first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.

A relay includes a contact container including a yoke plate and an insulating cover connected with the yoke plate to form a contact chamber; a pair of static contact leading-out terminals passing through a pair of first through holes of the insulating cover; a fixing member within the contact container and fixedly connected with the yoke plate; a movable member within the contact chamber and including a movable contact piece configured to come into contacted with or separated from the pair of static contact leading-out terminals; a moving part movable connected to the fixing member; and a first magnetizer connected with the moving part. The first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.

A relay includes a contact container having a contact chamber and a pair of first through holes; a pair of static contact leading-out terminals passing through the pair of first through holes; a moving part; a first magnetizer within the contact chamber and connected with the moving part; a movable member movably within the contact chamber and including a movable contact piece for contacting with or separating from the static contact leading-out terminals; and a fixing magnetizer fixedly arranged within the contact chamber. The first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.

A relay includes a contact container having a contact chamber and a pair of first through holes; a pair of static contact leading-out terminals passing through the pair of first through holes; a moving part; a first magnetizer within the contact chamber and connected with the moving part; a movable member movably within the contact chamber and including a movable contact piece for contacting with or separating from the static contact leading-out terminals; and a fixing magnetizer fixedly arranged within the contact chamber. The first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.

An electromagnetic relay includes an electromagnet device, a contactor, and a trip device turning the contactor into an open state in which the contactor opens when an abnormal current flows. The electromagnet device includes a first excitation coil, a fixed element, first and second movable elements, and a permanent magnet. The contactor includes a fixed contact and a movable contact. In the electromagnetic relay, while the permanent magnet causes the first movable element to attractingly contact the second movable element, the fixed element attracts the first movable element due to a magnetic flux generated by the first excitation coil so as to move the second movable element together with the first movable element from a normal position to an attracted position. In the contactor, the movable contact moves, as the second movable element moves, so as to switch between a closed state in which the movable contact contacts the fixed contact and the open state in which the movable contact is removed from the fixed contact. The contactor is turned into the closed state when the second movable element is located at the attracted position. The trip device includes a second excitation coil connected in series to the contactor and a spring for acting a force on the second movable element in a direction away from the first movable element.

A contact device and an electromagnetic contactor using the contact device. The contact device has: a main contact including a pair of fixed contact elements arranged at a predetermined distance from each other and a movable contact element elastically supported by a connecting shaft and arranged to be contactable with and separable from the pair of fixed contact elements; an auxiliary contact arranged at a position different from the main contact and including a pair of fixed contacts arranged at a predetermined distance from each other and a movable contact connected to the connecting shaft and arranged to be contactable with and separable from the pair of fixed contacts; a contact housing configured to house the main contact and the auxiliary contact; and external connection terminals electrically connected to the pair of fixed contacts of the auxiliary contact and projecting from the contact housing.

A contact mechanism of an electromagnetic relay comprises a contact assembly, a movable contact assembly and a driving unit. The contact assembly comprises a bottom plate, an upper case disposed on the bottom plate, and two stationary contact heads disposed on and penetrating the upper case. The movable contact assembly comprises a central axis passing through the contact assembly, a movable contact plate disposed on the top portion of the central axis and configured to contact with or separate from the two stationary contact heads, and a cover element covering the central portion of the central axis. The driving unit is disposed around the lower portion of the central axis and configured to drive the central axis to move back and forth along the axial direction for allowing the movable contact plate to contact with or separate from the two stationary contact heads.

An electromagnetic relay includes an electromagnet device, an armature and a fixed terminal. By coil current through a coil, the electromagnet device generates first magnetic flux that forces the armature and the electromagnet device together or apart in a first end in a first direction of the armature. The armature is connected with a movable contact at a second end of the first direction and forces the movable contact and a fixed contact together or apart according to coil current. The fixed terminal is electrically connected with the fixed contact, and provided around the armature so as to cross the armature as seen from a second direction perpendicular to the first direction with the armature closing the fixed and movable contacts. Electric current through the fixed terminal generates a second magnetic flux in the armature, a direction of which is opposite to that of the first magnetic flux.

In a main magnetic circuit, first pulling force generated based on a first component of the magnetic flux flowing through the main magnetic path pulls a movable core in a reciprocation direction of the movable core. The first pulling force increases with a reduction of a dimension of the gap. In an auxiliary magnetic circuit, second pulling force generated based on the second component of the magnetic flux flowing through the auxiliary magnetic path pulls the movable core in the reciprocation direction of the movable core. In the auxiliary magnetic circuit, the second pulling force with the dimension of the gap being within a first range is changed to be higher than the second pulling force with the dimension of the gap being within a second range, the second range being smaller than the first range.

An electromagnetic relay is provided. The electromagnetic relay includes a first port and a second port, a first coil and a second coil, a movable armature coupled between the first port and the second port constructed to connect and disconnect the first port and the second port, a switch circuit, and a coil control circuit. The switch circuit is constructed to connect the first coil to an external power source to induce the first coil to create a first magnetic field having a first direction and disconnect the first coil from the external power source to cause the first magnetic field to collapse. The coil control circuit is constructed to induce the second coil to create a second magnetic field having a second direction responsive to the switch circuit being in the second state, the second direction being opposite the first direction.