A molded case circuit breaker

Abstract

This invention discloses a molded case circuit breaker, comprising a housing, an electrically operated mechanism disposed within the housing, the electrically operated mechanism including a moving contact actuation assembly with a rotating block and a lever, a sliding block slidably disposed on the housing and capable of driving the lever, an operating shaft capable of driving the sliding block to slide and having an operating hole, and a motor reduction assembly capable of driving the operating shaft to rotate. The operating shaft is linked to a lever block, and the sliding block is provided with a mating groove corresponding to the lever block. Rotation of the operating shaft causes the lever block to move within the mating groove, thereby causing the sliding block to slide. A cover plate slidably disposed on the housing to cover the operating hole is provided. The housing also includes a rotary lock and a trip button located on one side of the rotary lock. This invention, by setting a locking micro switch, a manual micro switch, a first micro switch, and a second micro switch, can realize signal feedback of manual operation state, rotary lock locking state, and current circuit breaker state.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and more specifically, to a molded case circuit breaker. Background Technology

[0002] Existing molded case circuit breakers with energy storage electric operating mechanisms typically have free trip, re-trip, and closing states. These mechanisms generally offer both manual and automatic operation modes, which can be switched between to operate the corresponding circuit breakers. Energy storage involves storing electrical energy in a compressed spring via a motor and reduction gear. When needed, the stored energy is released instantaneously to push the circuit breaker handle, closing the molded case circuit breaker. In manual mode, operating the manual operating mechanism stores energy in the energy storage mechanism, completing the re-trip operation of the corresponding circuit breaker and preparing for the next closing operation. In automatic mode, an electrical signal is given to the electric operator, and the motor, through multi-stage gear transmission, stores energy in the energy storage mechanism, simultaneously completing the re-trip operation of the corresponding circuit breaker and preparing for the next closing operation. The manual mode described above is applicable to local operation, when operators need to perform closing and opening operations on the circuit breaker on site. The automatic mode is applicable to remote operation, where operators can remotely control the electric operating mechanism through communication to perform closing and opening operations on the circuit breaker.

[0003] In the manual and automatic operation of the electric operating mechanism, it is necessary to clearly distinguish between manual and automatic operations to prevent confusion. Appropriate locking mechanisms should also be implemented to restrict certain operations and prevent safety hazards caused by misoperation of the molded case circuit breaker. Furthermore, during remote electric operation, the current status of the circuit breaker needs to be detected. This is typically achieved through a microswitch and circuit board located within the molded case circuit breaker. The microswitch feeds back the current status signal of the molded case circuit breaker to the circuit board, thus enabling remote control of the electric operating mechanism. This requires a signal status feedback indication to the circuit board via an indicator mechanism containing the microswitch. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art. Its structure is reasonably designed. By setting a locking micro switch, a manual micro switch, a first micro switch and a second micro switch, it can realize the manual operation state, the rotary lock locking state and the signal feedback of the current circuit breaker being in free trip, closed or re-tripped state. Furthermore, the rotary lock can limit the movement of other components through rotation locking, prevent misoperation and improve operational safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A molded case circuit breaker includes a housing, within which an electric operating mechanism is disposed. The electric operating mechanism includes a moving contact actuation assembly with a rotary block and a lever, a sliding block slidably disposed on the housing and capable of driving the lever, an operating shaft capable of driving the sliding block to slide and having an operating hole, and a motor reduction assembly capable of driving the operating shaft to rotate. The operating shaft is linked to a lever block. The sliding block is provided with a mating groove corresponding to the lever block. Rotation of the operating shaft drives the lever block to move in the mating groove, thereby driving the sliding block to slide. A cover plate slidably disposed on the housing to cover the operating hole is provided. The housing also provides a rotary lock and a trip button located on one side of the rotary lock. A manual micro switch is provided on one side of the housing located on the cover plate, and a locking micro switch is provided on one side of the housing located on the rotary lock. The rotary lock is circumferentially provided with an abutment block that can abut against the locking micro switch, a limiting block that can limit the downward pressure of the trip button, and a limiting block that can limit the sliding of the cover plate. The rotary lock rotates clockwise from the unlocked state. When the needle rotates to the locked state, the contact block abuts against the locking micro switch, and the limit block restricts the release button from pressing down. When the sliding cover exposes the operating hole, the manual micro switch is abutted by the cover. The housing is also equipped with a main circuit board, a first micro switch and a second micro switch spaced apart. A swing arm is rotatably mounted inside the housing. The swing arm includes a rotating part in the middle, an abutting section on one side of the rotating part that abuts against the rotating block, and an abutting section on the other side of the rotating part that can abut against the first micro switch and the second micro switch. The swing arm is rotatably mounted on the housing through the rotating part, so that when the rotating block rotates, the rotating block presses against the abutting section and drives the swing arm to swing. When the abutting section abuts against the first micro switch, the main circuit board receives a free release status signal; when the abutting section abuts against the second micro switch, the main circuit board receives a closed status signal; when the abutting section is between the first micro switch and the second micro switch and does not abut against the first micro switch and the second micro switch, the main circuit board receives a re-tightening status signal.

[0007] By adopting the above technical solution, in specific operation, the electric operating mechanism can be remotely operated. Specifically, the circuit board controls the motor reduction assembly to drive the operating shaft to rotate. The operating shaft then drives the actuating shaft to move within the mating groove, causing the sliding block to slide. The sliding block, in turn, drives the lever to move, thus controlling the moving contact actuating component. The electric operating mechanism has free-tripping, re-tripping, and closing states. The sliding block drives the electric operating mechanism to perform re-tripping and closing actions. Pressing the trip button switches the electric operating mechanism to the tripping state. When manual operation is required, the sliding cover exposes the operating hole. A special tool can be inserted into the operating hole to rotate the operating shaft. Because a manual microswitch is provided, it is only activated after the sliding plate exposes the operating hole, thus outputting a manual operation signal to the main circuit board. Furthermore, by setting a rotation lock and a locking microswitch, the contact block engages with the locking microswitch only when the rotation lock is rotated clockwise from the unlocked state to the locked state. At this point, the locking microswitch sends a signal to the main circuit board to lock the rotation lock. In this system, while the rotary lock is in the locked state, the limit block can restrict the downward pressure of the trip button, thus providing a safety protection function. Furthermore, by setting a swing arm that is linked to the electric operating mechanism, the swing arm will swing accordingly when the electric operating mechanism is in different operating states. By changing the position of the swing arm and the two microswitches, the system can relay the closed state, free trip state, and re-trip state to the main circuit board.

[0008] Preferably, the rotating part includes an arc-shaped rotating body and rotating shafts on both sides of the arc-shaped rotating body. The abutting section and the contact section are fixed or integrally disposed in the arc-shaped rotating body. The swing rod passes through the housing. The housing is provided with a receiving groove adapted to the rotating part and used to accommodate the rotating part. Rotating grooves adapted to the rotating shafts are provided on both sides of the receiving groove. A fixed cover plate is provided on the housing at the position corresponding to the receiving groove. The fixed cover plate covers and blocks the rotating groove. The abutting section is L-shaped. The abutting section is provided with an abutting end face that abuts against the rotating block. The rotating block is provided with a pressing surface corresponding to the abutting end face.

[0009] By adopting the above technical solution, the rotating part is rotatably mounted in the receiving groove, allowing the rocker arm to swing relative to the housing when pressed by the rotating block. The rotating shafts on both sides are located in the rotating grooves on either side of the receiving groove, and the rotating shafts are positioned in the rotating grooves by a fixed cover plate fixed to the housing, ensuring that the rotating shafts can only rotate within the rotating grooves. This prevents the rotating part from rotating out of the receiving groove, thus guaranteeing the rotational stability of the rotating part. Specifically, the fixed cover plate is fixed to the housing with screws, facilitating subsequent lubrication and maintenance of the rotating part or easy inspection of the rocker arm. A torsion spring can be fitted onto the rotating part to provide rotational restoring force, and the fixed cover plate also serves to press and fix the torsion spring. Furthermore, the rocker arm swings by the pressing surface pressing against the contact end face. The contact end face can be inclined with the pressing surface, and combined with the L-shaped contact section, the contact section can accurately swing between the two microswitches.

[0010] Preferably, the end of the contact section away from the rotating part is designated as the contact end, which extends out of the receiving groove. The contact end is provided with a contact surface that can abut against the first micro switch and the second micro switch. The first micro switch is located away from the contact surface, and the second micro switch is located close to the contact surface. The front side of the contact surface can abut against the first micro switch, and the side side of the contact surface can abut against the second micro switch.

[0011] By adopting the above technical solution, the front of the contact surface contacts the first micro switch, while the side of the contact surface contacts the second micro switch. The structure is reasonably designed, and the two micro switches can be contacted by the contact surfaces at different positions.

[0012] Preferably, the housing is provided with an arc-extinguishing chamber and a stationary contact located below the arc-extinguishing chamber. The arc-extinguishing chamber includes an outlet baffle, two side plates, an arc-extinguishing grid plate disposed between the two side plates, and an insulating partition disposed inside the two side plates. The bottom of the arc-extinguishing chamber is provided with a bottom block that engages with the stationary contact. The stationary contact forms a C-shaped cavity corresponding to the position of the bottom block. Multiple first magnetic blown plates are vertically stacked in the C-shaped cavity. The insulating partition is provided with a second magnetic blown plate that is inserted into the bottom block and abuts against the first magnetic blown plates.

[0013] By adopting the above technical solution, by setting a first magnetic blown plate inside the stationary contact, and setting multiple first magnetic blown plates vertically stacked and riveted, and positioning them in a C-shaped cavity, the C-shaped cavity being formed by the stationary contact itself, and then setting a second magnetic blown plate inside the insulating partition, the second magnetic blown plate abutting and conducting with the first magnetic blown plate, the opening and closing breaking capacity of the circuit breaker can be improved and the damage and burning of the silver contacts on the stationary contact can be reduced.

[0014] Preferably, the cover plate is provided with a limit block, the height of the limit block and the limit stop are set to correspond, and the limit block can be limited by both sides of the limit block. The trip button is provided with a blocking block that can abut against the limit block. The blocking block is higher than the limit block in the height direction. The abutting block and the locking micro switch are at the same height. The limit block is located below the abutting block and the limit block.

[0015] By adopting the above technical solution, this configuration ensures that regardless of whether the cover plate slides and obstructs or exposes the operating hole, as long as the rotary lock is in the locked state, the limiting block will be limited and blocked by the side of the limiting block, restricting the cover plate from sliding. The limiting block cooperates with the blocking block, and the limiting block is set lower than the blocking block. When the rotary lock is in the locked state, the limiting block is located directly below the blocking block. At this time, the blocking block on the release button is limited by the limiting block, so the release button cannot be pressed down to perform the release operation. The abutment block cooperates with the locking micro switch. By setting the limiting block below the abutment block and the limiting block, this reasonable layout of the limiting block, abutment block, and limiting block on the side height of the rotary lock avoids interference and allows them to cooperate with the corresponding components to achieve the corresponding limiting function.

[0016] Preferably, a limiting side is provided on the side of the sliding block near the rotary lock, and a side groove is provided in the middle of the limiting side of the sliding block. A side protrusion is provided on the rotary lock that can be located in the side groove. The limiting side blocks the side protrusion to restrict the rotation of the rotary lock. The side groove is only opposite to the side protrusion when the electric operating mechanism is in the re-locking state, at which time the side protrusion is located in the side groove.

[0017] The main purpose of adopting the above technical solution is to ensure that the rotary lock can only be locked in the re-engaged state. Specifically, when the electric operating mechanism is in the re-engaged state, the side protrusion is located in the side groove. Since the side groove provides rotation space for the side protrusion, the rotary lock can be rotated at this time. However, when the electric operating mechanism is in the free-release or closed state, if the rotary lock is to be rotated from the unlocked state to the locked state, the side protrusion will be blocked and limited by the limiting side, preventing the rotary lock from rotating. This restricts the usage scenarios of the rotary lock and prevents accidental operation of the rotary lock that could lead to safety hazards.

[0018] Preferably, the housing includes a base and a middle seat connected to the base. A secondary circuit board electrically connected to the main circuit board is provided on the middle seat. At least one terminal is fixedly connected to the side of the secondary circuit board facing the base. A buckle is provided on the middle seat corresponding to each terminal. After the base and the middle seat are connected, each terminal is inserted into the corresponding buckle to achieve power supply to the secondary circuit board.

[0019] By adopting the above technical solution and setting a matching structure between the wiring pins and the snap-fit, the middle seat is fixedly connected to the base during assembly, so that the wiring pins are inserted into the corresponding snap-fit ​​and the two are electrically connected. In this way, power can be drawn from the secondary circuit board on the middle seat, which in turn can draw power from the main circuit board. This effectively replaces the traditional method of soldering wires on the circuit board and the relatively complex wiring structure inside the molded case circuit breaker. It is easy to install and convenient to draw power.

[0020] Preferably, the snap fastener includes a base plate and elastic pieces fixed or integrally disposed on both sides above the base plate. The wiring pin is inserted into the gap between the two elastic pieces and abuts against the elastic pieces. The side of the base plate is connected to a wire piece. There are two wiring pins and two snap fasteners respectively, and the two snap fasteners are spaced apart.

[0021] By adopting the above technical solution, and by using a base plate and two elastic plates on both sides for the snap fastener, the two elastic plates can maintain effective contact with the terminal when the terminal is inserted, so that there is a stable electrical connection between the snap fastener and the terminal. Furthermore, by fixing or integrally setting a wire piece on the side of the base plate, the wire piece can accommodate, position and guide the wire connected to the snap fastener, making the wiring more reasonable. In addition, the two snap fasteners are set on the base at a certain distance, which can effectively increase the creepage distance and ensure electrical safety.

[0022] Preferably, the outer periphery of the snap fastener is provided with a positioning post block, the side of the positioning post block is provided with a side placement opening, the top of the positioning post block is provided with a through hole for the wiring pin to pass through, the base is provided with a positioning post hole for accommodating the positioning post block, the snap fastener is positioned and installed in the positioning post block, a limit plate is fixedly provided inside the positioning post block, the bottom plate of the snap fastener is positioned between the limit plate and the bottom surface of the positioning post block, the bottom of the positioning post block is provided with an insertion post, and the positioning post hole is provided with an insertion hole that mates with the insertion post.

[0023] By adopting the above technical solution, the side-mounted opening is used for the insertion of the snap-fit ​​into the positioning block, while the through hole is used for the wiring pins to pass through and be smoothly inserted into the snap-fit. After the snap-fit ​​is installed into the positioning block, the positioning block is then assembled into the positioning hole, so that the snap-fit ​​is located on the base. During installation, the bottom plate is inserted between the bottom surface of the limiting plate and the bottom surface of the positioning block, so that the snap-fit ​​is tightly fitted and positioned in the positioning block. The installation is convenient and the positioning is stable. The limiting plate can be integrally set with the positioning block, and the snap-fit ​​can be inserted into the corresponding hole to position and install the positioning block into the positioning hole, which is convenient for installation.

[0024] Preferably, the bottom of the base is provided with a terminal block, and the side of the base located on the terminal block is provided with a wire groove. The positioning post hole is provided with a wire through hole communicating with the guide groove, and the buckle is connected to the terminal block through the wire.

[0025] By adopting the above technical solution, the buckle is electrically connected to the terminal block via a wire, and then electrically connected to the buckle via a pin, which enables power to be drawn from the inside of the circuit board. By setting wire grooves and guide grooves, the wires connected to the buckle can be reasonably routed, preventing the problem of low internal space utilization due to unreasonable wire layout. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the structure of the shell according to a specific embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram illustrating the internal structure of the housing in a specific embodiment of the present invention. Figure 1 ;

[0028] Figure 3 This is a schematic diagram illustrating the structure of the electric operating mechanism in a specific embodiment of the present invention. Figure 1 ;

[0029] Figure 4 This is a schematic diagram illustrating the structure of the electric operating mechanism in a specific embodiment of the present invention. Figure 2 ;

[0030] Figure 5 This is a schematic diagram illustrating the structure of the sliding block in a specific embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram illustrating the structure of the cover plate and the rotary lock in a specific embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram illustrating the structure of the arc-extinguishing chamber according to a specific embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram illustrating the structure of the stationary contact in a specific embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram illustrating the structure of the sliding block in a specific embodiment of the present invention;

[0035] Figure 10 This is a schematic diagram illustrating the structure of the rotating block and the swing arm in a specific embodiment of the present invention;

[0036] Figure 11 This is a schematic diagram illustrating the internal structure of the housing in a specific embodiment of the present invention. Figure 2 ;

[0037] Figure 12 This is a schematic diagram illustrating the internal structure of the housing in a specific embodiment of the present invention. Figure 3 ;

[0038] Figure 13 This is a schematic diagram illustrating the structure of the receiving groove in a specific embodiment of the present invention;

[0039] Figure 14 This is a schematic diagram illustrating the structure of the pendulum rod in a specific embodiment of the present invention. Figure 1 ;

[0040] Figure 15 This is a schematic diagram illustrating the structure of the pendulum rod in a specific embodiment of the present invention. Figure 2 ;

[0041] Figure 16 This is a schematic diagram illustrating the structure of the base in a specific embodiment of the present invention. Figure 1 ;

[0042] Figure 17 This is a schematic diagram illustrating the structure of the base in a specific embodiment of the present invention. Figure 2 ;

[0043] Figure 18 This is a schematic diagram illustrating the structure of the buckle located in the positioning block according to a specific embodiment of the present invention;

[0044] Figure 19 This is a schematic diagram illustrating the structure of the buckle in a specific embodiment of the present invention;

[0045] Figure 20 This is a schematic diagram illustrating the structure of the positioning column block in a specific embodiment of the present invention;

[0046] Figure 21 The following is a schematic diagram of the structure of the middle seat in a specific embodiment of the present invention. Figure 1 ;

[0047] Figure 22 The following is a schematic diagram of the structure of the middle seat in a specific embodiment of the present invention. Figure 2 ;

[0048] Figure 23 This is a schematic diagram illustrating the structure of the sub-circuit board in a specific embodiment of the present invention;

[0049] Figure 24 This is a schematic diagram illustrating the structure of the wiring terminal in a specific embodiment of the present invention.

[0050] In the diagram: 1. Housing; 111. Manual micro switch; 112. Locking micro switch; 2. Electric operating mechanism; 21. Moving contact actuation assembly; 22. Lever; 23. Motor reduction assembly; 3. Sliding block; 31. Limiting side; 32. Side groove; 33. Mating groove; 4. Operating shaft; 41. Operating hole; 42. Actuating shaft block; 5. Cover plate; 51. Limiting stop block; 6. Rotary lock; 61. Abutment block; 62. Restriction. 63. Limiting block; 64. Side protrusion; 7. Tripping button; 71. Blocking block; 8. Arc-extinguishing chamber; 81. Vent baffle; 82. Side plate; 83. Arc-extinguishing grid; 84. Insulating partition; 85. Bottom block; 86. Second magnetic blower; 9. Stationary contact; 91. C-shaped cavity; 92. First magnetic blower; 2011. First micro switch; 2012. Second micro switch; 2013. Main circuit board; 203. Rotating block; 2 031, Pressing surface; 204, Swing rod; 2041, Rotating part; 20411, Arc-shaped rotating body; 20412, Rotating shaft; 2042, Abutting section; 20421, Abutting end face; 2043, Contact section; 20431, Contact end; 20432, Contact surface; 20433, Front; 20434, Side; 205, Receiving groove; 2051, Rotating groove; 2052, Fixed cover plate; 301, Base; 3011, Positioning pin hole; 3012, Insertion hole; 3013, Terminal; 3014, Wire groove; 3015, Wire through hole; 302, Center seat; 303, Sub-circuit board; 304, Terminal pin; 305, Plug; 3051, Base plate; 3052, Elastic sheet; 3053, Wire sheet; 306, Positioning pin block; 3061, Side placement opening; 3062, Through hole; 3063, Limiting plate; 3064, Insertion pin. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] like Figure 1-24As shown, a molded case circuit breaker includes a housing 1, within which an electric operating mechanism 2 is disposed. The electric operating mechanism 2 includes a moving contact actuation assembly 21 having a rotating block 203 and a lever 22, a sliding block 3 slidably disposed on the housing 1 and capable of driving the lever 22 to move, an operating shaft 4 capable of driving the sliding block 3 to slide and having an operating hole 41, and a motor reduction assembly 23 capable of driving the operating shaft 4 to rotate. The operating shaft 4 is linked to a lever block 42. The sliding block 3 is provided with a mating groove 33 corresponding to the lever block 42. The rotation of the operating shaft 4 drives the lever block 42 to move in the mating groove 33, thereby driving the sliding block 3 to slide. The housing 1 is equipped with a cover plate 5 that can cover the operation hole 41. The housing 1 also has a rotary lock 6 and a release button 7 located on one side of the rotary lock 6. The housing 1 is characterized by having a manual micro switch 111 on one side of the cover plate 5 and a locking micro switch 112 on one side of the rotary lock 6. The rotary lock 6 is circumferentially equipped with an abutment block 61 that can abut against the locking micro switch 112, a limiting block 62 that restricts the downward pressure of the release button 7, and a limiting block 63 that restricts the sliding of the cover plate 5. When the rotary lock 6 rotates clockwise from the unlocked state to the locked state, the abutment block 61 abuts against and limits the locking micro switch 112. When block 63 restricts the release button 7 from being pressed down, the manual micro switch 111 is abutted by the cover plate 5 when the sliding cover plate 5 exposes the operation hole 41. The housing 1 is also provided with a main circuit board 2013, a first micro switch 2011 and a second micro switch 2012 arranged at intervals. A rocker arm 204 is rotatably arranged inside the housing 1. The rocker arm 204 includes a rotating part 2041 located in the middle, an abutting section 2042 located on one side of the rotating part 2041 and abutting against the rotating block 203, and an abutting section 2043 located on the other side of the rotating part 2041 and abutting against the first micro switch 2011 and the second micro switch 2012. The rocker arm 204 rotates... Part 2041 is rotatably mounted on housing 1 so that when rotating block 203 rotates, rotating block 203 presses against abutting section 2042 and drives swing rod 204 to swing. When abutting section 2043 abuts against first micro switch 2011, main circuit board 2013 receives free trip status signal; when abutting section 2043 abuts against second micro switch 2012, main circuit board 2013 receives closing status signal; when abutting section 2043 is between first micro switch 2011 and second micro switch 2012 and does not abut against first micro switch 2011 and second micro switch 2012, main circuit board 2013 receives re-tightening status signal.

[0053] The rotating part 2041 includes an arc-shaped rotating body 20411 and rotating shafts 20412 disposed on both sides of the arc-shaped rotating body 20411. Abutting sections 2042 and 2043 are fixedly or integrally disposed on the arc-shaped rotating body 20411. A swing rod 204 passes through the housing 1. The housing 1 is provided with a receiving groove 205 adapted to and used to accommodate the rotating part 2041. Rotating grooves 2051 adapted to the rotating shafts 20412 are provided on both sides of the receiving groove 205. A fixed cover plate 2052 is provided on the housing corresponding to the receiving groove 205, covering and shielding the rotating grooves 2051. The abutting section 2042 is L-shaped and has abutting section that abuts against the rotating block 203. The abutting end face 20421 is provided on the rotating block 203, and the abutting end face 20421 is provided on the abutting block 203. The end of the abutting section 2043 away from the rotating part 2041 is provided as the abutting end 20431. The abutting end 20431 extends out of the receiving groove 205. The abutting end 20431 is provided with abutting surface 20432 that can abut with the first micro switch 2011 and the second micro switch 2012. The first micro switch 2011 is located away from the abutting surface 20432, and the second micro switch 2012 is located close to the abutting surface 20432. The front side 20433 of the abutting surface 20432 can abut with the first micro switch 2011, and the side side 20434 of the abutting surface 20432 can abut with the second micro switch 2012.

[0054] Furthermore, the housing 1 is provided with an arc-extinguishing chamber 8 and a stationary contact 9 located below the arc-extinguishing chamber 8. The arc-extinguishing chamber 8 includes an outlet baffle 81, two side plates 82, an arc-extinguishing grid plate 83 located between the two side plates 82, and an insulating partition plate 84 located inside the two side plates 82. The bottom of the arc-extinguishing chamber 8 is provided with a bottom block 85 that is engaged with the stationary contact 9. The stationary contact 9 forms a C-shaped cavity 91 corresponding to the position of the bottom block 85. Multiple first magnetic blowers 92 are vertically stacked in the C-shaped cavity 91. The insulating partition plate 84 is provided with a second magnetic blower 86 that is inserted into the bottom block 85 and abuts against the first magnetic blowers 92.

[0055] The cover plate 5 is provided with a limit stop 51, and the height of the limit block 63 is set to correspond to that of the limit stop 51. Both sides 20434 of the limit block 63 can limit the limit stop 51. The release button 7 is provided with a blocking block 71 that can abut against the limit block 62. The blocking block 71 is higher than the limit block 62 in the height direction. The abutting block 61 and the locking micro switch 112 are at the same height. The limit block 62 is located below the abutting block 61 and the limit block 63. The sliding block 3 is provided with a limit side 31 on the side near the rotary lock 6. The sliding block 3 is provided with a side groove 32 in the middle of the limit side 31. The rotary lock 6 is provided with a side protrusion 64 that can be located in the side groove 32. The limit side 31 blocks the side protrusion 64 to limit the rotation of the rotary lock 6. The side groove 32 is only opposite to the side protrusion 64 when the electric operating mechanism 2 is in the re-locking state. At this time, the side protrusion 64 is located in the side groove 32.

[0056] Additionally, the housing 1 includes a base 301 and a middle seat 302 connected to the base 301. A secondary circuit board 303, electrically connected to the main circuit board 2013, is mounted on the middle seat 302. At least one pin 304 is fixedly connected to the side of the secondary circuit board 303 facing the base 301. A latch 305 is provided on the middle seat 302 corresponding to each pin 304. After the base 301 and the middle seat 302 are connected, each pin 304 is inserted into the corresponding latch 305. In section 05, power is drawn from the sub-circuit board 303. The latch 305 includes a base plate 3051 and elastic pieces 3052 fixedly or integrally disposed on both sides above the base plate 3051. A terminal 304 is inserted into the gap between the two elastic pieces 3052 and abuts against them. A wire piece 3053 is connected to the side of the base plate 3051. Two terminals 304 and two latches 305 are correspondingly provided, with the two latches 305 spaced apart. The outer periphery of the latch 305... A positioning block 306 is provided, with a side placement opening 3061 on its side and a through hole 3062 on its top for the wiring pin 304 to pass through. A positioning hole 3011 for accommodating the positioning block 306 is provided on the base 301. A snap fastener 305 is positioned and installed in the positioning block 306. A limit plate 3063 is fixedly provided inside the positioning block 306, and the bottom piece 3051 of the snap fastener 305 is positioned against the limit plate 3063 and... Between the bottom surfaces of the positioning pins 306, the bottom of the positioning pins 306 is provided with a pin 3064, the positioning pin hole 3011 is provided with a hole 3012 that mates with the pin 3064, the bottom of the base 301 is provided with a terminal 3013, the side of the terminal 3013 on the base 301 is provided with a wire groove 3014, the positioning pin hole 3011 is provided with a wire through hole 3015 that communicates with the guide groove, and the buckle 305 is connected to the terminal 3013 through a wire.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A molded case circuit breaker, comprising a housing (1), an electric operating mechanism (2) disposed within the housing (1), the electric operating mechanism (2) comprising a moving contact actuation assembly (21) having a rotating block (203) and a lever (22), a sliding block (3) slidably disposed on the housing (1) and capable of driving the lever (22) to move, an operating shaft (4) capable of driving the sliding block (3) to slide and having an operating hole (41), and a motor reduction assembly (23) capable of driving the operating shaft (4) to rotate. (4) A toggle shaft block (42) is linked together. A matching groove (33) corresponding to the toggle shaft block (42) is provided on the sliding block (3). The operation shaft (4) rotates to drive the toggle shaft block (42) to move in the matching groove (33), thereby driving the sliding block (3) to slide. A cover plate (5) that can cover the operation hole (41) is slidably provided on the housing (1). A rotary lock (6) and a release button (7) located on one side of the rotary lock (6) are also provided on the housing (1). The feature is that A manual micro switch (111) is provided on one side of the cover plate (5) on the housing (1), and a locking micro switch (112) is provided on one side of the rotary lock (6) on the housing (1). The rotary lock (6) is provided with a contact block (61) that can abut against the locking micro switch (112), a limiting block (62) that can limit the downward pressure of the release button (7), and a limiting block (63) that can limit the sliding of the cover plate (5) in the circumferential direction. When the rotary lock (6) is rotated clockwise from the unlocked state to the locked state, the contact block (61) and the lock When the fixed micro switch (112) abuts against and the limiting block (63) restricts the release button (7) from pressing down, the manual micro switch (111) is abutted by the cover plate (5) when the sliding cover plate (5) exposes the operation hole (41). The housing (1) is also provided with a main circuit board (2013), a first micro switch (2011) and a second micro switch (2012) arranged at intervals. A rocker arm (204) is rotatably arranged inside the housing (1). The rocker arm (204) includes a rotating part (2041) located in the middle and a rotating part located in the rotating part. (2041) has an abutting section (2042) on one side that abuts against the rotating block (203) and an abutting section (2043) on the other side of the rotating part (2041) that can abut against the first micro switch (2011) and the second micro switch (2012). The rocker arm (204) is rotatably mounted on the housing (1) via the rotating part (2041) so that when the rotating block (203) rotates, the rotating block (203) presses against the abutting section (2042) and drives the rocker arm (204) to swing. When the abutting section (2043) abuts against the first micro switch (2011) and the second micro switch (2012), the rocker arm (204) is rotatably mounted on the housing (1) via the rotating part (2041). When a micro switch (2011) is in contact, the main circuit board (2013) receives a free trip status signal; when the contact section (2043) is in contact with the second micro switch (2012), the main circuit board (2013) receives a closing status signal; when the contact section (2043) is between the first micro switch (2011) and the second micro switch (2012) and is not in contact with the first micro switch (2011) and the second micro switch (2012), the main circuit board (2013) receives a re-trip status signal.

2. A molded case circuit breaker according to claim 1, characterized in that, The rotating part (2041) includes an arc-shaped rotating body (20411) and rotating shafts (20412) disposed on both sides of the arc-shaped rotating body (20411). The abutting section (2042) and the contact section (2043) are fixed or integrally disposed on the arc-shaped rotating body (20411). The swing rod (204) passes through the housing (1). The housing (1) is provided with a receiving groove (205) that is adapted to the rotating part (2041) and is used to accommodate the rotating part (2041). The receiving groove (205) has two sides. A rotating groove (2051) adapted to the rotating shaft (20412) is provided. A fixed cover plate (2052) is provided on the housing at the position corresponding to the receiving groove (205). The fixed cover plate (2052) covers and blocks the rotating groove (2051). The abutting section (2042) is L-shaped. An abutting end face (20421) that abuts against the rotating block (203) is provided on the abutting section (2042). A pressing surface (2031) corresponding to the abutting end face (20421) is provided on the rotating block (203).

3. A molded case circuit breaker according to claim 2, characterized in that, The end of the contact section (2043) away from the rotating part (2041) is configured as the contact end (20431). The contact end (20431) extends out of the receiving groove (205). The contact end (20431) is provided with a contact surface (20432) that can abut against the first micro switch (2011) and the second micro switch (2012). The first micro switch (2011) is located away from the contact surface (20432), and the second micro switch (2012) is located close to the contact surface (20432). The front side (20433) of the contact surface (20432) can abut against the first micro switch (2011), and the side side (20434) of the contact surface (20432) can abut against the second micro switch (2012).

4. A molded case circuit breaker according to claim 1, 2, or 3, characterized in that, The housing (1) is provided with an arc-extinguishing chamber (8) and a stationary contact (9) located below the arc-extinguishing chamber (8). The arc-extinguishing chamber (8) includes an outlet baffle (81), two side plates (82), an arc-extinguishing grid plate (83) located between the two side plates (82), and an insulating partition plate (84) located inside the two side plates (82). The bottom of the arc-extinguishing chamber (8) is provided with a bottom block (85) that is engaged with the stationary contact (9). The stationary contact (9) forms a C-shaped cavity (91) corresponding to the position of the bottom block (85). Multiple first magnetic blowers (92) are vertically stacked in the C-shaped cavity (91). The insulating partition plate (84) is provided with a second magnetic blower (86) that is inserted into the bottom block (85) and abuts against the first magnetic blowers (92).

5. A molded case circuit breaker according to claim 4, characterized in that, A limit stop (51) is provided on the cover plate (5). The height of the limit block (63) and the limit stop (51) are set accordingly. Both sides (20434) of the limit block (63) can limit the limit stop (51). The trip button (7) is provided with a blocking block (71) that can abut against the limit block (62). The blocking block (71) is higher than the limit block (62) in the height direction. The contact block (61) and the locking micro switch (112) are at the same height. The limit block (62) is located below the contact block (61) and the limit block (63).

6. A molded case circuit breaker according to claim 5, characterized in that, A limiting side (31) is provided on the side of the sliding block (3) near the rotary lock (6). A side groove (32) is provided in the middle of the limiting side (31). A side protrusion (64) is provided on the rotary lock (6) that can be located in the side groove (32). The limiting side (31) blocks the side protrusion (64) to restrict the rotation of the rotary lock (6). The side groove (32) is only opposite to the side protrusion (64) when the electric operating mechanism (2) is in the re-locking state. At this time, the side protrusion (64) is located in the side groove (32).

7. A molded case circuit breaker according to claim 6, characterized in that, The housing (1) includes a base (301) and a middle seat (302) connected to the base (301). The middle seat (302) is provided with a secondary circuit board (303) electrically connected to the main circuit board (2013). At least one terminal (304) is fixedly connected to the side of the secondary circuit board (303) facing the base (301). A buckle (305) is provided on the middle seat (302) corresponding to each terminal (304). After the base (301) and the middle seat (302) are connected, each terminal (304) is inserted into the corresponding buckle (305) to realize the power supply of the secondary circuit board (303).

8. A molded case circuit breaker according to claim 7, characterized in that, The snap fastener (305) includes a base plate (3051) and elastic pieces (3052) fixed or integrally disposed on both sides above the base plate (3051). The wiring pin (304) is inserted into the gap between the two elastic pieces (3052) and abuts against the elastic pieces (3052). The side of the base plate (3051) is connected to a wire piece (3053). There are two corresponding wiring pins (304) and snap fasteners (305), and the two snap fasteners (305) are spaced apart.

9. A molded case circuit breaker according to claim 8, characterized in that, The outer periphery of the snap fastener (305) is provided with a positioning post (306), the side of the positioning post (306) is provided with a side placement opening (3061), the top of the positioning post (306) is provided with a through hole (3062) for the wiring pin (304) to pass through, the base (301) is provided with a positioning post hole (3011) for accommodating the positioning post (306), the snap fastener (305) is positioned and installed in the positioning post (306), a limit plate (3063) is fixedly provided inside the positioning post (306), the bottom piece (3051) of the snap fastener (305) is positioned between the limit plate (3063) and the bottom surface of the positioning post (306), the bottom of the positioning post (306) is provided with a pin (3064), and the positioning post hole (3011) is provided with a insertion hole (3012) that mates with the pin (3064).

10. A molded case circuit breaker according to claim 9, characterized in that, The bottom of the base (301) is provided with a terminal (3013), and a wire groove (3014) is provided on the side of the terminal (3013) on the base (301). A wire through hole (3015) communicating with the guide groove is provided on the positioning post hole (3011). The buckle (305) is connected to the terminal (3013) through the wire.

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