Abstract: A monostable permanent magnetic actuator using a laminated steel core, comprises: lamination cores formed as a plurality of metallic thin plates are laminated to each other; a coil disposed to be adjacent to the lamination cores, and configured to apply a magnetic force to the lamination cores by an external power; a mover mounted in the lamination cores so as to be movable in upper and lower directions; permanent magnets installed at the lamination cores, and configured to apply an upward and downward magnetic force to the mover; and an elastic means configured to apply an elastic force to the mover in an opposite direction to the permanent magnets.

Abstract: Disclosed are an elastic pressing unit and a molded case circuit breaker having the same, the molded case circuit breaker including, a plurality of fixed contacts, a plurality of movable contacts disposed to be rotatable between a closing position contacted with the corresponding fixed contacts and a breaking position or trip position separated from the corresponding fixed contacts, a rotation pin disposed to be simultaneously connected to the movable contacts, a mechanical unit connected to the rotation pin so as to allow the movable contacts to be simultaneously rotatable, and an elastic pressing unit configured to apply an elastic force to the rotation pin such that the rotation pin is rotated toward the closing position, whereby component deformation can be prevented, resulting in ensuring operation reliability and stability of the mechanical unit.

Abstract: Disclosed is provided a hybrid-type superconducting fault current limiter for rapidly limiting a fault current, the fault current limiter having a first circuit and a second circuit which are connected in parallel with each other, wherein the first circuit includes a superconductor and a circuit breaker which are connected in series with each other, and wherein the second circuit includes a driver having a driving coil and an electromagnetic repeller, a short contact connected in parallel with the driver, and a current limiting unit connected in series with a third circuit including the driver and the short contact. The hybrid-type superconducting fault current limiter comprises a power semiconductor element switch connected in series with the first circuit, the power semiconductor element switch normally maintaining an ON state and being activated and changed into an OFF state by a fault sensing signal generated according to an inflow of the fault current.

Abstract: Disclosed is a tulip contacting device for a vacuum circuit breaker employed to quickly break off an electric power system, in which contact fingers are bidirectionally rotatable in a state of being restricted at an outer diameter portion of a mover holder, such that the flexibility of the contact fingers can be increased, whereby it is possible, upon connecting the vacuum circuit breaker to a case, to flexibly deal with the variation of axial angles of terminals inserted in both sides of the tulip contacting device, and also springs may be coupled to the contact fingers, respectively, so as to effectively prevent separation and overall destroy of the contact fingers from the mover holder during installation.

Abstract: An auxiliary contact unit for a magnetic contactor is disclosed, wherein the auxiliary contact unit is disposed at an inner lower frame thereof with a cover connected to lower hooks and supporting an upper structure, and the cover is supported at a lower surface thereof by a protrusion.

Abstract: A high speed closing switch in a power distributor includes: a case forming an external appearance; a first electrode provided within the case and including a through hole; a second electrode having a receiving recess facing the through hole; a moving contact point member having a cylindrical portion received in the through hole so as to be put into the receiving recess and a flange portion formed at one end of the cylindrical portion; and a closing coil wound on a base of the case, wherein a damping hole is formed at receiving recess of the second electrode. When the moving contact point member put into the receiving recess approaches its final position, a damping force is applied to the moving contact point member to stably and accurately control the final position.

Abstract: The present invention relates to an electromagnetic contactor having an abrasion preventing means, and there is provided an electromagnetic contactor including an upper frame having a fixed contact point and a guide rail; a cross bar comprising a sliding portion sliding on the guide rail, a movable contact point contacting and separating with respect to the fixed contact point while sliding along the guide rail, and a movable core; and a lower frame comprising a fixed core disposed adjacent to the movable core, an excitation coil magnetizing the fixed core by an electromotive force, and a return spring exerting an elastic force to the cross bar, wherein the sliding portion is configured separately from the cross bar, and a material forming the sliding portion has a friction coefficient against the guide rail less than that of the cross bar.

Abstract: A thermal overload trip apparatus capable of minimizing inferiority caused by variations during manufacturing of an adjusting means and simply adjusting sensitivity by duplicating the means for adjusting a sensitivity to a trip operation current, comprising: a trip mechanism driven to a trip position by a driving force from a shifter mechanism on occurrence of an overload in a circuit; a release lever mechanism for driving the trip mechanism to the trip position by pressing it when there is the driving force from the shifter mechanism or for releasing the trip mechanism when there is no driving force, on occurrence of the overload in the circuit; an adjusting lever for operating the release lever mechanism to be horizontally moved by rotation; an adjusting knob having an upper surface having a setting groove and a lower portion having a cam portion; and a means independently adjusting the sensitivity to the trip operation current regardless of manipulation of the adjusting knob.

Abstract: Disclosed is a micro switch having a high capability of cutting off a direct current. In the micro switch including a stationary contact, a movable contact having a closed position where it contacts the stationary contact or an open position where it is separated from the stationary contact, a movable contact rod for supporting the movable contact, a plunger for pressurizing the movable contact rod upon being pressed, and a leaf spring for supplying a driving force to the movable contact rod to convert a position of the contacts being contacted or separated, a permanent magnet is installed at a position adjacent to the movable to contact and the stationary contact, so as to extend an arc generated between the movable contact and the stationary contact upon separating the movable contact from the stationary contact, whereby the arc can be fast extinguished.

Abstract: In a case for a circuit breaker in which a terminal is simply replaceable or mountable according to a wiring method of the circuit breaker, the case comprises a case which accommodates components for breaking a circuit, a terminal block portion which provides a common platform for plural types of terminals, and a door engaged with the case in monolithic form so that it may be operable to a closed position for closing the case or an opened position for installing a selected terminal of the plural types of terminals.

Abstract: Disclosed is a switching mechanism for a motor protection circuit breaker capable of reducing a force required to adjust a handle, and capable of enhancing the reliability to break a circuit. The switching mechanism for a motor protection circuit breaker comprises a push link having an outer circumferential curved surface of a varying cam profile, so as to enhance a function to break the circuit by pressing movable contact plates.

Abstract: An air circuit breaker having a mechanical trip indicating mechanism, in an air circuit breaker including a switching mechanism, an actuator having an output link for providing a mechanical driving force, a first link unit connected between the output link of the actuator and the switching mechanism for applying the mechanical driving force from the output link to the switching mechanism to perform a trip operation, a front surface plate provided with a manipulating unit accessible by a user, the air circuit breaker comprising: a first rotation lever connected to the first link unit, a second link unit limitedly moved by the first rotation lever, a bias spring for applying an elastic biasing force to the second link unit to be moved in one direction, a second rotation lever installed to be rotatable with coming in contact with one end portion of the second link unit, and a mechanical trip indicating mechanism supported by the front surface plate and having an indicating portion exposed to the front surface pl

Abstract: Disclosed is a mold cased circuit breaker (MCCB) comprising a plurality of single pole breaking units simultaneously opened and closed by a pair of common shaft pins. The MCCB effectively transmits a torque for opening or closing contacts to adjacent single pole breaking unit for electrical pole with a minimized loss, and prevents the shaft pins from being bent. The MCCB comprises a crank installed across the pair of shaft pins so as to connect the shaft pins to each other.

Abstract: The present invention is to provide a main circuit terminal assembly for a vacuum circuit breaker, which can prevent temperature increase by increasing a surface area of a main circuit conductive unit, the main circuit terminal assembly for a vacuum circuit breaker which is electrically connected to a vacuum interrupter, including: a clamp electrically connected to a movable unit of the vacuum interrupter, and configured as a pair of conductors so as to support the movable unit by clamping; a heat sink fixed to the clamp that increase a surface area of the clamp; a flexible shunt having one end thereof electrically and mechanically connected to the clamp, and configured as a flexible conductor to allow the movable unit to move; a terminal block electrically and mechanically connected to another end of the flexible shunt, and configured as an electrical conductor; and a contactor unit electrically connected to the terminal block and having a plurality of clip-shaped contactors.

Abstract: Disclosed are a radio frequency identification (RFID) reader antenna using an RFID technique and an apparatus for managing items using the same, the antenna comprising: a feeding portion having one end connected to an RFID reader and another end connected to a ground; and a conductive radiating electrode disposed above the feeding portion by being spaced apart from the feeding portion by a certain distance and configured to send or receive a signal of a certain band to/from an RFID tag attached to each item by an electromagnetic coupling with the feeding portion.

Abstract: Disclosed are a solid-insulated disconnection switch and a solid-insulated switchgear using the same. The solid-insulated switchgear using the solid-insulated disconnection switch according to the present invention can have an eco-friendly characteristic and a small size by solid-insulating each unit, a disconnection switches and earth switch constituting each unit. In the solid-insulated switchgear according to the present invention, each unit and each part constituting each unit are standardized so as to be interchangeable to each other, thereby implementing a simple manufacture. Furthermore, the solid-insulated switchgear can be manufactured according to an installation environment and a user's various demands, and can have an enhanced maintenance/repair characteristic.