5920results about "Protective switch operating/release mechanisms" patented technology

The invention relates to a circuit breaker and a switching-on and switching-off operation power adjusting method thereof. The circuit breaker comprises a main crank arm, an opening chain, a closing lock catch device and a spring operating mechanism. The main crank arm is connected with the opening chain, and the closing lock catch device is in unlocking connection with the main crank arm. The spring operating mechanism comprises an energy storage spring, an operating power adjusting mechanism and a pressure sensor, the energy storage spring is compressed under the traction of the opening chain, and when the main crank arm is in an unlocking state, the energy storage spring can rebound and pull the opening chain so as to drive the output shaft to rotate to a theoretical opening position. The pressure sensor is connected with the energy storage spring and used for monitoring the pressure value of the energy storage spring in real time, and the operation work adjusting mechanism is connected with the energy storage spring and used for adjusting the pressure value of the energy storage spring. The operating power adjusting mechanism of the circuit breaker can timely adjust the compression amount of the energy storage spring according to the pressure value, so that the energy storage spring can be always maintained within the preset pressure range, and the opening and closing phase selection precision of the circuit breaker is improved.

A linkage device adapted to control two electric switches including a main control shaft member, an actuation system including a first actuation member for actuating a control shaft of a first electric switch, and a second actuation member for actuating a control shaft of a second electric switch. A mechanism of the linkage device is provided with a torque limiting connection for each electric switch, wherein the torque limiting connection is adapted to disengage during an opening event if a torque exerted to an actuation member exceeds a predetermined limit value. The linkage device includes a stopping member system adapted to co-operate with a linkage arm system for preventing rotation of the main control shaft member to an OFF-position when the torque limiting connection of at least one linkage arm of the linkage arm system is in a disengaged position.

The invention relates to the technical field of mine safety, and discloses a coal mine underground gas monitoring method and system. The method comprises the following steps: acquiring methane absorption intensity data by adopting a tunable diode laser absorption spectrum, converting the methane absorption intensity data into gas concentration based on a Lambert-Beer law, performing temperature and humidity compensation, calculating a transmission priority according to concentration deviation to form a data packet, and establishing a spatial interpolation model by utilizing multipoint data to predict gas concentration distribution. Calculating a risk assessment index based on the predicted distribution, automatically adjusting the rotating speed of the ventilator, and controlling the electrical equipment to be powered off. According to the method, the technical problems of low detection precision, incomplete monitoring coverage, low data transmission efficiency and lack of prediction and early warning capabilities in the existing underground coal mine gas monitoring method are solved. And the accuracy of gas concentration detection and the intelligent level of gas monitoring are improved.

The utility model belongs to the technical field of low-voltage switches, and particularly relates to a free tripping structure for a rotary disconnecting switch, the rotary disconnecting switch comprises a knob and a switch assembly composed of a plurality of switch units, and the free tripping structure is connected between the knob and the switch assembly; the free tripping structure comprises a mechanism support and a multi-connecting-rod mechanism with an energy storage piece, the multi-connecting-rod mechanism with the energy storage piece comprises an output connecting rod, the output connecting rod is in hinged fit with the mechanism support through a first hinged shaft, the output connecting rod is provided with an output part in transmission fit with the switch assembly, and the output connecting rod rotates around a point D and has a switching-off position and a switching-on position. And a first power-assisted elastic piece is connected between the output connecting rod and the mechanism bracket. On the basis of an existing free tripping structure, the first power-assisted elastic piece is arranged for the output connecting rod located at the transmission tail end of the multi-connecting-rod mechanism, the opening and closing force output by the multi-connecting-rod mechanism can be freely adjusted through the first power-assisted elastic piece, and the opening and closing action of the switch is more reliable.

The invention discloses an intelligent control method and system based on pole-mounted circuit breaker equipment, and relates to the technical field of power grid control, and the method comprises the steps: collecting environmental data of a pole-mounted circuit breaker, employing a Kalman filtering fusion algorithm, outputting a fusion state vector, constructing time series data, employing a photon to calculate an accelerated time series neural network, and obtaining a time series neural network model; and performing complex field mapping and optical phase shift modulation on the extracted features, and predicting a future current value. According to the method, complex field mapping is carried out on features extracted by a time convolution layer, the expression ability of nonlinear features is enhanced, optical phase shift modulation is introduced, phase and amplitude information is further adjusted, the nonlinear modeling ability of time sequence features is improved, and multi-modal data fusion and multi-scale consistency verification of fractal dimensions are combined, so that the time sequence features of the fractal dimension are optimized. Time scale deviation of different data sources is eliminated, and effectiveness and consistency of multi-dimensional feature fusion are improved.

Embodiments of the present technology include a circuit breaker with a tripping mechanism. The tripping mechanism includes a latch and a latch lever, according to some embodiments. The latch lever may be coupled to a toggle via a joint arm in some embodiments. The latch lever may also be coupled to a change lever via a buckled shackle. In some embodiments, the buckled shackle includes a first section, a second section, and a bend between the first section and the second section.

The utility model discloses a novel reclosing circuit breaker, which comprises a one-way direct current motor, a transmission mechanism and a control assembly, and is characterized in that the control assembly is used for controlling the one-way direct current motor to start and stop; the side walls comprise two long side walls, the control assembly is arranged near one long side wall, and the transmission mechanism is arranged between the control assembly and the other long side wall; the transmission mechanism comprises a reduction gear set, an eccentric wheel and an output sliding block. The input end of the reduction gear set is connected with the output part of the one-way direct current motor; the output end of the reduction gear set is connected with the eccentric wheel; the eccentric wheel is rotatably arranged, the output sliding block is slidably arranged, the eccentric wheel is connected with the output sliding block to drive the sliding block to move, and the eccentric wheel acts on the output sliding block to make the output sliding block reciprocate through continuous output of the one-way direct current motor; the output sliding block is sleeved on the extending end of the handle, and the opening operation and the closing operation of the handle are realized through the reciprocating motion of the output sliding block; the utility model has the characteristics of more compact structure and miniaturization.

The utility model discloses a small leakage protection circuit breaker, an operating mechanism thereof and a double-breakpoint test loop. The operating mechanism comprises a handle and a reset torsion spring, the operating mechanism has a switching-on state and a switching-off state, and the reset torsion spring is used for providing reset force for the handle; wherein the reset torsion spring is made of a conductive material; the double-breakpoint test loop comprises a first breakpoint, a second breakpoint and a test button; when the operating mechanism is in a closed state, the first breakpoint is in an on state under the pressing of the operating mechanism; when the operating mechanism is in an opening state, the first breakpoint is in a breaking state; the second breakpoint comprises a second static contact and a second moving contact, the second moving contact and the reset torsion spring are integrally formed, the second moving contact is located below the test button, and when the test button is pressed by external force, the second moving contact and the second static contact are in a connected state; when the first breakpoint and the second breakpoint are both in the on state, the double-breakpoint test loop is conducted; the device has the advantage of being more compact in structure.

The utility model relates to the technical field of circuit breakers, and particularly discloses an integrated sealing type primary and secondary fusion pole-mounted circuit breaker, which comprises a primary and secondary fusion circuit breaker main body, an energy storage shaft is arranged at one end of the primary and secondary fusion circuit breaker main body, an energy storage handle is arranged at the end part of the energy storage shaft, and a stand column is arranged on the energy storage handle far away from the energy storage shaft. A mounting groove is formed in the middle of the stand column, a top spring is arranged in the middle of the mounting groove, and matched extrusion beads corresponding to the top spring are arranged at the two ends in the mounting groove; compared with a traditional scheme, under the mutual cooperation of all parts, the manual labor of personnel can be effectively reduced in the scheme, and the personnel can shake the energy storage handle more comfortably, so that the pain caused by overlarge hand force and discomfort in the operation process of the personnel is effectively avoided, and the safety of the personnel is improved. Therefore, the operator can operate the circuit breaker on the column conveniently.

The present disclosure relates to a manual motor starter and, more specifically, to a trip device for a manual motor starter. A trip device for a manual motor starter according to an embodiment of the present disclosure comprises: a trip unit body forming the base of a trip unit; a fixed contact coupled to the lower portion of the trip unit body; a heater assembly inserted and coupled to the trip unit body and detecting the heat variation; a coil coupled to the upper portion of the trip unit body; a core unit inserted into the coil; a terminal rod coupled to the core unit and the trip unit body, and having one end portion forming a terminal unit; and an instant trip lever which is rotatably coupled to the trip unit body and is operated by the core unit, wherein a coil attachment portion in which the coil is inserted and installed protrudes from the trip unit body.

The invention relates to the technical field of repulsive force switches, and particularly discloses a repulsive force mechanism buffer device based on magnetorheological fluid, which comprises a piston type magnetorheological damper, a magnet exciting coil, a displacement sensor and a control system, the magnet exciting coil is wound on the outer surface of a piston assembly of the piston type magnetorheological damper; the piston type magnetorheological damper adjusts the rheological property of magnetorheological fluid through a magnetic field generated by the magnet exciting coil. The displacement sensor is used for detecting the movement of a repulsive force disc in the repulsive force mechanism; the excitation coil and the displacement sensor are electrically connected with the control system; the control system regulates the power supply current intensity of the magnet exciting coil at least according to detection information of the displacement sensor; according to the repulsive force mechanism buffering device based on the magnetorheological fluid, the magnet exciting coil is used for generating a magnetic field, discharging control is conducted on the coil through the capacitor, and therefore real-time adjustment of the magnetorheological fluid damper is achieved, impact and vibration of the repulsive force mechanism are effectively reduced, the operation stability of equipment is improved, and the service life of the equipment is prolonged.

The utility model relates to the field of circuit breakers, in particular to an electromagnetic locking molded case circuit breaker. Comprising a housing including a mounting seat and a cover plate; an electromagnet is arranged in the first side wall of the mounting seat and is electrically connected with the contact system; the cover plate comprises a front panel and a second side wall; a magnetic attraction sliding part sliding front and back is installed in the second side wall, a first sliding abutting part is arranged at the front end of the magnetic attraction sliding part, and a first inclined face is arranged on the first sliding abutting part. A locking rod is arranged in the front panel, a reset spring is arranged on the locking rod, a second sliding abutting portion abutting against the first inclined face is arranged on the rear side of the locking rod, a second inclined face is arranged on the second sliding abutting portion, and the second inclined face abuts against the first inclined face. The operating mechanism comprises a release handle, and a locking hole matched with the locking rod is formed in the release handle; the locking rod prevents the release handle from rotating when external force is received, and the electromagnet attracts the magnetic attraction sliding part to achieve reinforced fixation between the installation base and the cover plate.

The utility model provides a fast closing circuit breaker, which comprises a contact mechanism, an operating mechanism and a limiting assembly, in the closing process, a moving contact has a first state in which the moving contact is linked with a moving contact frame and rotates towards a direction close to a static contact, and a second state in which the moving contact keeps a constant distance from the static contact after abutting against a limiting block and a first elastic piece stores energy; compared with the prior art, through the arrangement of the energy storage mechanism, the movable contact and the static contact can be quickly connected, the phenomenon that the contact is ablated or welded due to high temperature due to the fact that the contact is connected or disconnected due to human factors is avoided, and the safety of the contact is improved. And the service life of the circuit breaker is prolonged.

The invention discloses a small residual-current circuit breaker, which comprises a shell, an operating mechanism, a residual-current release and a transmission rod, when the electric leakage tripper is actuated, an ejector rod of the electric leakage tripper pushes the transmission rod, so that the transmission rod rotates from a reset position to an actuating position, and the transmission rod pushes the mechanism assembly to unlock in the rotating process, so that the operation mechanism is converted from closing to tripping. The rotation center of the handle and the rotation center of the mechanism assembly are both located in the first space, and the handle is located between the electric leakage release and the mechanism assembly in the length direction; the handle is provided with a reset part, and after the electric leakage release is actuated, the reset part impacts the transmission rod to enable the transmission rod to return to the reset position from the actuation position in the process that the handle is converted from closing to tripping; the position relation of the electric leakage tripper, the operating mechanism and the like is rearranged, so that the product structure is more compact, and the size of the circuit breaker in the length direction is reduced.

The utility model provides a circuit breaker, which comprises a shell and internal elements, the internal elements at least comprise an upper arc extinguish chamber, a lower arc extinguish chamber, a double-breakpoint contact system, a first wiring terminal, a second wiring terminal, an overload release, a mechanism and a rotating shaft, and the double-breakpoint contact system comprises a single-breakpoint moving contact, a double-breakpoint moving contact and a static contact. The mechanism drives at least one rotating shaft, the double-breakpoint contact system is arranged between the upper arc extinguish chamber and the lower arc extinguish chamber, and the single-breakpoint moving contact and the double-breakpoint moving contact are respectively driven by two rotating shafts. When the circuit breaker is subjected to breaking and manual operation opening, the mechanism drives the two sets of rotating shafts to move together so that the two breakpoints can be kept disconnected at the same time, the opening distance is large, the isolation performance is good, and high-short-circuit current under high voltage can be broken.

The invention relates to the technical field of circuit breakers, in particular to a circuit breaker with a reclosing mechanism, which comprises a shell, a circuit breaker handle is rotationally arranged in the shell, an operating rod and at least three gears meshed in sequence are further rotationally arranged in the shell, and the tooth number of each gear is gradually increased in sequence. The two gears located on the two sides are a small gear and a large gear respectively, the number of teeth of the small gear is smaller than the number of teeth of the large gear, the operating rod is fixedly connected with the small gear, and the large gear is in transmission connection with a circuit breaker handle. Speed reduction and torque increase are realized through the gear train, so that the force required to be applied when a user manually operates the handle of the circuit breaker is remarkably reduced, the operation intensity is reduced, the convenience of manual reclosing is improved, and the manual reclosing device is particularly suitable for a large-current circuit breaker or an occasion requiring a relatively large operation torque.

The invention provides a miniature circuit breaker, which comprises a shell, a handle, a connecting rod, a contact support, a lock catch, a lock catch elastic piece and a support elastic piece, and is characterized in that the shell is provided with an indication window; the handle is rotationally mounted on the shell; the connecting rod is provided with a first rod part connected with the handle and a second rod part matched with the contact support; and the contact support is rotationally installed on the shell through a rotating shaft, and a first indicating part which can be arranged corresponding to the indicating window is formed on the contact support. In an opening state, the first indication part of the contact support is arranged corresponding to the indication window. In a switching-on state, the second indicating part of the lock catch corresponds to the indicating window, and the contact support and the lock catch are different in color during injection molding, so that compared with the prior art in which indicating surfaces with different colors need to be processed on the contact support in an ink screen printing manner after injection molding, the production process is simpler, and the production efficiency is improved. And the production cost is reduced.

The invention discloses a multi-sensor fusion circuit breaker just-opening and just-closing point monitoring method, device and equipment, and the method comprises the steps: obtaining a vibration signal of a contact of a circuit breaker, and determining a first just-opening and just-closing point; obtaining the current of an electromagnet coil of the circuit breaker, and determining a second just-open-just-close point; obtaining the opening and closing angular displacement of the main shaft of the circuit breaker, and determining a third just-opening and just-closing point; self-adaptive weighted fusion is carried out on the first, second and third just-open and just-close points, and just-open and just-close moments are obtained; and comparing the just-opening and just-closing moment with calibration data of the circuit breaker, and giving an alarm if a difference value exceeds a drift threshold value. According to the invention, the change process of the circuit breaker can be monitored, and the accuracy of just-open-just-close point judgment is improved.

The invention belongs to the technical field of circuit breakers, and particularly relates to a primary and secondary fusion pole-mounted circuit breaker capable of automatically reclosing, which comprises a mechanism box, an arc extinguish chamber, a moving ball, a connecting rope and an electromagnetic block, the mechanism box is provided with three arc extinguish chambers, and the front end of the mechanism box is sequentially provided with an operation handle, an energy storage pull ring, a switch-on and switch-off pointer and a control interface. Handle rings are fixed to the two ends of the operating handle, a horizontally-placed mounting box is fixed to the bottom of the front end of the mechanism box, the movable ball is arranged in the mounting box in a sliding mode, a connecting rope is connected between one side of the movable ball and the handle rings, and an electromagnetic block capable of horizontally moving is arranged in the mounting box. According to the invention, through non-contact connection of the electromagnetic block and the moving ball, the operation of reclosing by pulling the operating handle can be effectively realized, and the circuit expansion damage caused by hard reclosing can be effectively avoided when a continuous fault of the circuit is encountered.

The invention discloses a low-voltage circuit breaker for a photovoltaic switch, which comprises a low-voltage circuit breaker body and a pluggable fixed shell arranged on the right side of the low-voltage circuit breaker body, and a first transparent shell and a second transparent shell which are movable are arranged on the left side of the fixed shell. According to the invention, by rotating the rotating block, the first transparent shell and the second transparent shell can cover the switch on the low-voltage circuit breaker, so that the switch is prevented from being touched by mistake during use, the electric push rod drives the arc-shaped locking block to move up and down, so that the arc-shaped locking block locks the limiting groove in the rotating block through the limiting block, and the safety of the low-voltage circuit breaker is improved. When a low-voltage circuit breaker is disconnected and a maintainer carries out maintenance on a fault circuit, the protection switch is prevented from being pushed to be closed by a person who does not know the condition, the phenomenon of electric shock caused by the maintenance worker is avoided, and only the maintainer can separate the arc-shaped locking block from the rotating block, so that the maintenance efficiency is improved. Therefore, the operation on the switch on the low-voltage circuit breaker is unlocked.

A compensation bimetal having at least two bends configured to reverse the direction of the compensation bimetal to form “S” curves is disclosed. The first end of the compensation bimetal is coupled with a differential lever while the second end is coupled with a tripping pin, and the length of the multi-metallic strip is greater than the distance between the differential lever and the tripping pin. The compensation bimetal may be bimetallic, trimetallic strip, or tetra-metallic. The compensation bimetal with the described configuration compensates for a greater range of ambient temperature fluctuations while preserving sensitivity to thermal tripping due to over-current conditions.

The utility model relates to the field of low-voltage electric appliances, in particular to a power supply control mechanism, which comprises a reset button, a tripping rod, a tripper, a control module and a switch contact system. When the reset button is at the hasp position or the release position, the switch contact system is switched on or switched off; a switch moving contact mechanism of the switch contact system comprises a contact support, a switch moving contact and a switch moving contact spring; in the process that the reset button moves to the hasp position, the switch moving contact mechanism is firstly driven to move to enable the switch moving contact to be in initial contact with the switch static contact, and then the contact support and the switch moving contact are driven to move relatively to enable the switch moving contact spring to store energy; in the process that the reset button moves to the tripping position, the switch moving contact spring releases energy to enable the switch moving contact and the contact support to recover limiting fit; according to the power supply control mechanism, the current-carrying capability and the arc-resistant capability of the switch contact system are good.

The present disclosure relates to a circuit breaker having an energy releasing mechanism of an opening / closing mechanism part, and a circuit breaker according to an embodiment of the present invention comprises: an input latch locking device rotatably formed to restrict or release an input latch according to rotating angles thereof; an interlock movement rail which is installed on a cradle and in which an inspection position, a preparation position, and a driving position are configured; an interlock member for operating at least one among the input latch and a trip latch in a section excluding the inspection position, the preparation position, and the driving position while vertically moving in association with a relative movement of the interlock movement rail; and at least one link member connected between the interlock member and the input latch locking device and switching a linear movement in a vertical direction of the interlock member to a rotation movement, thereby rotating the input latch locking device.

The invention discloses a molded case circuit breaker, which comprises a shell, and an electric operating mechanism is arranged in the shell. The electric operating mechanism comprises a moving contact action assembly with a rotating block and a shifting rod, a sliding block which is arranged on the shell in a sliding manner and can drive the shifting rod to shift, an operating shaft which can drive the sliding block to slide and is provided with an operating hole site, and a motor speed reduction assembly which can drive the operating shaft to rotate, and the operating shaft is in linkage connection with a shifting shaft block; the sliding block is provided with a matching groove corresponding to the shifting shaft block, the operation shaft rotates to drive the shifting shaft block to shift in the matching groove so as to drive the sliding block to slide, the shell is provided with a cover plate capable of shielding the operation hole position in a sliding mode, and the shell is further provided with a rotating lock and a tripping button located on one side of the rotating lock. By arranging the locking microswitch, the manual microswitch, the first microswitch and the second microswitch, signal feedback of a manual operation state, a rotating lock locking state and a current circuit breaker state can be realized.

The utility model discloses an operation locking mechanism of a molded case circuit breaker, which comprises a shell and an electric operation mechanism arranged in the shell. The electric operating mechanism comprises a moving contact action assembly with a driving lever, a sliding block which is arranged on the shell in a sliding manner and can drive the driving lever to shift, an operating shaft which can drive the sliding block to slide and is provided with an operating hole site, and a motor speed reducing assembly which can drive the operating shaft to rotate, and a cover plate which can shield the operating hole site is arranged on the shell in a sliding manner; the shell is also provided with a rotating lock and a tripping button positioned on one side of the rotating lock, and is characterized in that the shell is provided with a manual microswitch positioned on one side of the cover plate, and the shell is provided with a locking microswitch positioned on one side of the rotating lock. By arranging the locking microswitch and the manual microswitch, signal transmission of a manual operation state and a rotating lock locking state can be achieved, limiting of other components can be achieved through rotating locking of the rotating lock, misoperation is prevented, and operation safety is improved.

A overload protection switch with a reverse restart switching structure that has a seesaw lampshade provided with a protruding block which extending downward from the outside of the seesaw lampshade to ensure that the seesaw lampshade and the moving rod are accurately positioned in the ON and OFF positions in the housing to form a three-stage switching type with bidirectional positioning and forms an overload protection switch that can continuously maintain sufficient insulation distance and does not reduce the insulation distance due to fatigue decay of the binary alloy conductive plate.

A breaking mechanism, an operating unit and a measuring switch, comprising: a housing formed by splicing a first housing and a second housing which cooperate with each other, an installation space being formed between the first housing and the second housing, and an installation hole being arranged between the first housing and the second housing and being perpendicular to the length direction of the housing; the breaking unit is arranged in the mounting space and comprises a moving contact assembly rotatably arranged in the mounting space and a static contact matched with the moving contact assembly; and the magnetic flux unit is mounted in the mounting hole. The breaking unit and the magnetic flux unit form a complete module, the accuracy of the position of the magnetic flux unit during installation is guaranteed, meanwhile, the position and structure for installing the magnetic flux additionally arranged in the middle cover are omitted, the independent installation holes have the limiting and guiding effects, the problem of magnetic flux motion deviation can be effectively solved, and the installation efficiency is improved. The stability and accuracy of the magnetic flux motion trail in the switching-on and switching-off processes are ensured, and the operation precision of the circuit breaker is greatly improved.

The invention discloses a shunt release of a circuit breaker, and belongs to the technical field of circuit breakers, the shunt release comprises a base, a quick release mechanism, a soft start mechanism and a movable iron core, the two sides of the base are provided with mounting bolts, the mounting bolts are used for fixing the base, the top of the base is provided with an adjusting seat, the two sides of the adjusting seat are connected with the base through connecting bolts, and the adjusting seat is connected with the base through connecting bolts. The top of the adjusting seat is provided with a quick release mechanism, the quick release mechanism is internally provided with an electromagnetic controller, and the electromagnetic controller is internally provided with an electromagnetic coil. The device has the beneficial effects that an adjusting bolt in a compensation mechanism is rotated, the adjusting bolt drives a sliding block to move, and the sliding block moves to further drive a push plate to move; the push plate pushes the other end of the reset spring, so that the reset spring is extruded additionally, the elasticity of the spring is compensated, and the problem that the reset speed of the pull rod is decreased due to elasticity attenuation of the reset spring is effectively solved.

The invention discloses a tripping structure and a circuit breaker, and relates to the low-voltage electrical technical field. The tripping structure comprises a pushing piece, a thermal tripping piece and an electromagnetic tripping assembly, wherein the thermal tripping piece and the electromagnetic tripping assembly are respectively matched with the pushing piece; the pushing piece comprises a first driving surface and a second driving surface which are arranged at an interval; the electromagnetic tripping assembly comprises a push rod; the deformation end of the thermal tripping piece is arranged on one side, deviating from the second driving surface, of the first driving surface; the deformation end of the push rod and the deformation end of the thermal tripping piece independently drive the pushing piece to move through the first driving face, and the second driving face is used for driving the operating mechanism to unlock. According to the tripping structure, through the position arrangement of the pushing piece, the driving force of the thermal tripping piece and the electromagnetic tripping assembly can be directly transmitted to the operating mechanism through the pushing piece, and compared with the existing two-stage transmission arrangement, the tripping structure provided by the invention has the advantages that the transmission links are reduced, the transmission loss is reduced, and the transmission efficiency of the driving force is improved.

The invention relates to the technical field of circuit breaker opening and closing structures, in particular to a circuit breaker mechanical automatic tripping type opening and closing locking holding mechanism which comprises a middle shaft driving rod with a moving contact installed at the front end, and further comprises an opening / closing holding block, an opening / closing locking mechanism, a locking mechanism, a locking mechanism and a locking mechanism, wherein the opening / closing holding block is provided with an embedding and clamping groove and coaxially installed on a rod body of the middle shaft driving rod; the driving part comprises a switching-off driving head and a switching-on driving head which are arranged on the middle shaft driving rod and are positioned on the upper side and the lower side of the switching-off / switching-on retaining block; the opening / closing holding locking sliding block is mounted on the base body on one side of the opening / closing holding block through a connecting spring and is used for locking the closing driving head and the opening driving head respectively during opening / closing; mechanical locking in the opening and closing process can be achieved, kinetic energy needed for overcoming huge attraction of a permanent magnet during opening and closing motion of the circuit breaker is eliminated, and driving force needed by opening and closing motion is reduced. The power supply structure of the eddy current driving circuit breaker is simplified, and high failure rate caused by a complex high-voltage power supply board is avoided.