Molded Case Circuit Breaker

Abstract

The present invention relates to the field of low-voltage electrical appliances, and particularly relates to a molded case circuit breaker, which includes a circuit breaker body. The circuit breaker body includes a body housing, and the body housing includes a cover and a base joined together. The body housing further includes at least one pole chamber, and each pole chamber is provided with a terminal cavity at each of its two ends. Each terminal cavity is provided with a wiring terminal; each of the said terminal cavities is composed of an upper half terminal cavity provided on the cover and a lower half terminal cavity provided on the base. Each wiring terminal includes a wiring frame, and both ends of each wiring frame are respectively arranged in the upper half terminal cavity and the lower half terminal cavity of one terminal cavity; the molded case circuit breaker further includes a terminal cover that is in one-to-one cooperation with the wiring frame. Each terminal cover includes two oppositely arranged terminal cover isolation side walls, and the two terminal cover isolation side walls are respectively arranged on both sides of the wiring frame; the molded case circuit breaker of the present invention has good insulation and high safety.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and specifically to a molded case circuit breaker. Background Art

[0002] Existing molded case circuit breakers mostly have the following problems:

[0003] First, for existing molded case circuit breakers, the slider of the electric operating device has two detachable guide plates. When performing opening and closing operations, the cam cooperates with the two guide plates respectively to drive the slider to move. The structure of the slider is complex and has a relatively high height, and displacement or detachment will occur during long-term opening and closing operations, ultimately affecting the reliability of the product.

[0004] Second, for existing molded case circuit breakers, when in the open state, they cannot be locked or the locking reliability is not high, and signals can still be detected for automatic closing, resulting in low safety.

[0005] Third, existing molded case circuit breakers generally use cage-type terminal posts. When the height of the base is reduced, the cage-type terminal posts cannot be fully accommodated in the base, resulting in a reduction in the creepage distance.

[0006] Fourth, for existing molded case circuit breakers, the arc extinguishing chamber has poor exhaust, affecting the breaking performance and electrical safety. Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide a molded case circuit breaker with good insulation and high safety.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A molded case circuit breaker includes a circuit breaker body 1. The circuit breaker body 1 includes a body housing 1a. The body housing 1a includes a cover 10a and a base 11a joined together. The body housing 1a further includes at least one pole chamber. Each pole chamber is provided with a terminal cavity at each end, and each terminal cavity is provided with a terminal. Each of the terminal cavities is composed of an upper half terminal cavity provided on the cover 10a and a lower half terminal cavity provided on the base 11a. Each terminal includes a terminal frame, and both ends of each terminal frame are respectively arranged in the upper half terminal cavity and the lower half terminal cavity of one terminal cavity; the molded case circuit breaker further includes a terminal cover that cooperates with the terminal frame one by one. Each terminal cover includes two relatively arranged terminal cover isolation side walls, and the two terminal cover isolation side walls are respectively arranged on both sides of the terminal frame.

[0010] Preferably, each terminal cover further includes a terminal cover limiting side wall. The terminal cover limiting side wall is respectively connected to the two terminal cover isolation side walls. The terminal cover limiting side wall is arranged on one side of the inner port of the terminal frame of the terminal frame, and both ends are respectively in limit cooperation with the cover 10a and the base 11a.

[0011] Preferably, a connection plate for connecting the terminal and the internal circuit of the electrode chamber is inserted into each of the connection frames. The connection plates are stacked on the bottom wall of the connection frames, and one end of the limiting side wall of the terminal cover that is in limiting cooperation with the base 11a abuts against the connection plate.

[0012] Preferably, the terminal includes a first terminal 5-0 and a second terminal 5-1. A first terminal cavity and a second terminal cavity are respectively provided at both ends of each electrode chamber. The first terminal 5-0 is arranged in the first terminal cavity, and the second terminal 5-1 is arranged in the second terminal cavity. The first terminal 5-0 includes a first connection frame 5-00, and the second terminal 5-1 includes a second connection frame 5-10. An arc extinguishing chamber 1-0 is further arranged in each electrode chamber, and the arc extinguishing chamber air outlet of the arc extinguishing chamber 1-0 faces the first terminal 5-0. The terminal cover includes a first terminal cover 4-0 and a second terminal cover 4-1, which are respectively matched with the first terminal 5-0 and the second terminal 5-1. The molded case circuit breaker further includes a first connection plate 5-03 and a second connection plate 5-13. One end of the first connection plate 5-03 is inserted into the first connection frame 5-00, and one end of the second connection plate 5-13 is inserted into the second connection frame 5-10.

[0013] Preferably, the first terminal cover 4-0 includes two relatively arranged first terminal cover isolation side walls 4-01 and a first terminal cover limiting side wall 4-03. The two first terminal cover isolation side walls 4-01 are arranged on both sides of the first connection frame 5-00. The first terminal cover limiting side wall 4-03 is respectively connected to the two first terminal cover isolation side walls 4-01, is arranged on one side of the inner port of the first connection frame of the first connection frame 5-00, and is in limiting cooperation with the cover 10a and the base 11a at both ends. One end of the first terminal cover limiting side wall 4-03 that is in limiting cooperation with the base 11a abuts against the first connection plate 5-03. The other end of the first terminal cover limiting side wall 4-03 protrudes on one side of the first connection frame 5-00 to form a terminal cover arc extinguishing grid part, and a plurality of exhaust holes 4-04 are arranged on the terminal cover arc extinguishing grid part.

[0014] Preferably, the first terminal cavity includes a first upper half terminal cavity 101b arranged on the cover 10a and a first lower half terminal cavity 101a arranged on the base 11a. Each of the inner end side walls of the first lower half terminal cavity 101a is provided with a first lower limiting groove 102a, and the inner end of the first upper half terminal cavity 101b is provided with a U-shaped first upper limiting groove 102b. The two side edges at the lower end of the first terminal cover limiting side wall 4-03 are respectively in limiting cooperation with the two first lower limiting grooves 102a, and the two side edges and the top edge at the upper end of the first terminal cover limiting side wall 4-03 are respectively in limiting cooperation with the first upper limiting groove 102b.

[0015] Preferably, the arc extinguishing chamber 1-0 includes a plurality of arc extinguishing grid plates arranged side by side. The other end of the first connection plate 5-03 passes through the middle of the arc extinguishing chamber 1-0 and is connected to the internal circuit of the pole chamber, dividing the plurality of arc extinguishing grid plates into two parts.

[0016] Preferably, the first terminal cover 4-0 further includes an arc isolating plate 4-06. The arc isolating plate 4-06 is arranged on the side of the arc extinguishing grid part of the terminal cover away from the arc extinguishing chamber 1-0 to block the exhaust hole 4-04. The first terminal cover 4-0 further includes a first terminal cover top wall 4-02. The first terminal cover top wall 4-02 is arranged on the upper side of the top wall of the first wiring frame 5-00. An arc isolating plate limiting groove 4-05 is provided at the connection of the first terminal cover top wall 4-02 and the first terminal cover limiting side wall 4-03. One end of the arc isolating plate 4-06 is inserted into the arc isolating plate limiting groove 4-05.

[0017] Preferably, the second terminal cover 4-1 includes two relatively arranged second terminal cover isolating side walls 4-11 and a second terminal cover limiting side wall 4-13. The two second terminal cover isolating side walls 4-11 are arranged on both sides of the second wiring frame 5-10. The second terminal cover limiting side wall 4-13 is respectively connected to the two second terminal cover isolating side walls 4-11 and is arranged on one side of the inner port of the second wiring frame 5-10 of the second wiring frame, and is respectively in limit cooperation with the cover 10a and the base 11a at both ends. One end of the second terminal cover limiting side wall 4-13 in limit cooperation with the base 11a abuts against the second connection plate 5-13, and the other end of the second terminal cover limiting side wall 4-13 is arranged close to the top wall of the second wiring frame 5-10.

[0018] Preferably, the second terminal cavity includes a second lower half terminal cavity 103a arranged on the base 11a and a second upper half terminal cavity 103b arranged on the cover 10a. Each of the inner end side walls of the second lower half terminal cavity 103a is provided with a second lower limiting groove 104a. The inner end of the second upper half terminal cavity 103b is provided with a second upper isolation wall 104b. The two side edges at the lower end of the second terminal cover limiting side wall 4-13 are respectively in limit cooperation with the two second lower limiting grooves 104a, and the top side edge of the second terminal cover limiting side wall 4-13 abuts against the second upper isolation wall 104b.

[0019] Preferably, the first terminal cover 4-0 includes two oppositely arranged first terminal cover isolation side walls 4-01, a first terminal cover limiting side wall 4-03, and a first terminal cover top wall 4-02; the first terminal cover top wall 4-02 and the two first terminal cover isolation side walls 4-01 form a U-shaped structure as a whole. The first terminal cover limiting side wall 4-03 is arranged on the same side of the first terminal cover isolation side walls 4-01 and is connected to each of them respectively, enclosing a first terminal cover cavity 4-00 for accommodating the first wiring frame 5-00. One end of the first terminal cover limiting side wall 4-03 protrudes on one side of the first terminal cover top wall 4-02 to form a terminal cover arc extinguishing grid portion, and a plurality of exhaust holes 4-04 are provided on the terminal cover arc extinguishing grid portion. The other end of the first terminal cover limiting side wall 4-03 protrudes on one side of the first terminal cover isolation side wall 4-01, and a first terminal cover avoidance groove 4-020 is provided in the middle of the first terminal cover top wall 4-02; the width of the portion of the first terminal cover limiting side wall 4-03 that cooperates with the base 11a > the width of the portion of the first terminal cover limiting side wall 4-03 that cooperates with the cover 10a; the first terminal cover 4-0 further includes an arc isolation plate 4-06, and the arc isolation plate 4-06 is arranged on the side of the terminal cover arc extinguishing grid portion away from the arc extinguishing chamber 1-0 to block the exhaust holes 4-04; an arc isolation plate limiting groove 4-05 is provided at the connection of the first terminal cover top wall 4-02 and the first terminal cover limiting side wall 4-03, and one end of the arc isolation plate 4-06 is inserted into the arc isolation plate limiting groove 4-05.

[0020] Preferably, the second terminal cover 4-1 includes two oppositely arranged second terminal cover isolation side walls 4-11, a second terminal cover limiting side wall 4-13, and a second terminal cover top wall 4-12; the second terminal cover top wall 4-12 and the two second terminal cover isolation side walls 4-11 form a U-shaped structure as a whole. The second terminal cover limiting side wall 4-13 is arranged on the same side of the second terminal cover isolation side walls 4-11 and is connected to each of them respectively, enclosing a second terminal cavity 4-10 for accommodating the second wiring frame 5-10. One end of the second terminal cover limiting side wall 4-13 is connected to the second terminal cover top wall 4-12 and is arranged close to the top wall of the second wiring frame 5-10. The other end of the second terminal cover limiting side wall 4-13 protrudes on one side of the second terminal cover isolation side wall 4-11, and a second terminal cover avoidance groove 4-120 is provided in the middle of the second terminal cover top wall 4-12; the width of the portion of the second terminal cover limiting side wall 4-13 that cooperates with the base 11a > the width of the remaining portion of the second terminal cover limiting side wall 4-13.

[0021] Preferably, three pole chambers are arranged side by side and spaced apart in the middle of the main body shell 1a, each pole chamber is composed of a lower pole chamber arranged on the base 11a and an upper pole chamber arranged on the cover 10a, and pole chamber side walls are provided between adjacent pole chambers, and the pole chamber side walls are composed of a lower pole chamber side wall arranged on the base 11a and an upper pole chamber side wall arranged on the cover 10a, and the joint between the lower pole chamber side wall and the upper pole chamber side wall forms a shell seam; each of the pole chambers includes a first terminal cavity and a second terminal cavity arranged at both ends thereof, and an arc extinguishing chamber cavity arranged in the middle of the pole chamber, and the arc extinguishing chamber cavity is arranged close to the first terminal cavity and is connected with it; the first terminal cavity includes a first lower terminal cavity 101a arranged on the base 11a and a first upper terminal cavity 101b arranged on the cover 10a; the second terminal cavity includes a A second lower terminal cavity 103a is arranged on the base 11a and a second upper terminal cavity 103b is arranged on the cover 10a; the arc extinguishing chamber cavity includes a lower arc extinguishing chamber cavity 100a arranged on the base 11a and an upper arc extinguishing chamber cavity 100b arranged on the cover 10a; a first lower limit groove 102a is respectively provided on the two side walls of the connection between the first lower terminal cavity 101a and the lower arc extinguishing chamber cavity 100a, and a first upper limit groove 102b of a U-shaped structure is provided at the connection between the first upper terminal cavity 101b and the upper arc extinguishing chamber cavity 100b; a second lower limit groove 104a is respectively provided on the two side walls of the second lower terminal cavity 103a close to one end of the lower arc extinguishing chamber cavity 100a, and a second upper isolation wall 104b is provided on one end of the second upper terminal cavity 103b close to the upper arc extinguishing chamber cavity 100b.

[0022] In the molded case circuit breaker of the present invention, the terminal cover can significantly increase the creepage distance, ensure the insulation between the pole chambers, and improve the safety of the electrical appliance. In addition, the two ends of the terminal cover limit side wall are respectively matched with the cover and the base limit, which ensures the assembly reliability of the terminal cover, thereby preventing the creepage distance from being reduced due to the terminal cover falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the molded case circuit breaker of the present invention, and at least shows the positional relationship between the first micro switch, the second micro switch, the third micro switch, the indicator plate, the switching push rod, and the locking device respectively;

[0024] Figure 2 It is a schematic structural diagram of a molded case circuit breaker of the present invention, and at least shows the structure of a slider bracket;

[0025] Figure 3 It is a schematic diagram of the structure of the electric operating device of the present invention, and the molded case circuit breaker is in the closed state;

[0026] Figure 4It is a schematic structural diagram of the electric operating device of the present invention, and the molded case circuit breaker is in the open state;

[0027] Figure 5 It is a schematic structural diagram of the transmission relationship among the drive spindle, turntable, cam and slider of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the lower bracket of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the slider of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the electric operating device of the present invention, the molded case circuit breaker is in the open state, and the driving projection of the locking member of the locking device presses against the driving rod of the third micro switch;

[0031] Figure 9 It is a schematic structural diagram of the electric operating device of the present invention, the molded case circuit breaker is in the open state, and the locking boss of the locking device is in limit fit with the first locking side of the locking structure to prevent the slider from sliding;

[0032] Figure 10 It is a schematic structural diagram of the electric operating device of the present invention, the molded case circuit breaker is in the closed state, and the driving projection of the locking member of the locking device releases the driving rod of the third micro switch;

[0033] Figure 11 It is a schematic structural diagram of the electric operating device of the present invention, the molded case circuit breaker is in the closed state, and the locking boss of the locking device is in limit fit with the first limiting side to prevent the locking member from rotating;

[0034] Figure 12 It is a schematic structural diagram of the locking device of the present invention;

[0035] Figure 13 It is a schematic structural diagram of the locking member of the present invention;

[0036] Figure 14 It is a schematic structural diagram of the circuit breaker body of the present invention, at least showing the mating relationship between the terminal cover and the terminal;

[0037] Figure 15 It is a schematic diagram of the positional relationship between the first terminal cover and the arc extinguishing chamber of the present invention;

[0038] Figure 16 It is a schematic diagram of the mating relationship between the first terminal cover and the first terminal of the present invention;

[0039] Figure 17 It is a schematic structural diagram of the first terminal cover of the present invention;

[0040] Figure 18Schematic diagram of the mating relationship between the second terminal cover and the second terminal of the present invention;

[0041] Figure 19 Schematic diagram of the structure of the second terminal cover of the present invention;

[0042] Figure 20 Schematic diagram of the mating relationship between the second connecting plate, the second terminal cover and the second terminal of the present invention;

[0043] Figure 21 Schematic diagram of the structure of the base of the present invention;

[0044] Figure 22 Schematic diagram of the structure of the cover of the present invention. Detailed implementation manners

[0045] The following, in conjunction with the Figures 1 - 22 embodiments given, further illustrate the detailed implementation manners of the molded case circuit breaker of the present invention. The molded case circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0046] As Figure 1 , 2 and FIG. 14 show, the molded case circuit breaker of the present invention includes a circuit breaker body 1. The circuit breaker body 1 includes a body housing 1a. The body housing 1a includes a cover 10a and a base 11a joined together. The body housing 1a further includes at least one pole chamber. A terminal is provided at each end of each pole chamber, and a movable contact and a static contact for cooperative use are provided in the middle of each pole chamber; the molded case circuit breaker further includes an operating mechanism 3. The operating mechanism 3 is drivingly connected to the movable contact in one pole chamber. This movable contact is the main movable contact, and the movable contacts in other pole chambers are linked with the main movable contact; the operating mechanism 3 includes a handle 30. By toggling the handle 30, the molded case circuit breaker is switched on / off.

[0047] Preferably, as Figure 2 , 14 -22 show, an improvement point of the molded case circuit breaker of the present invention is that: a terminal cavity is provided at each end of each pole chamber, and a terminal is provided in each terminal cavity; each terminal cavity is composed of an upper half terminal cavity provided on the cover 10a and a lower half terminal cavity provided on the base 11a; each terminal includes a wiring frame, and both ends of each wiring frame are respectively provided in the upper half terminal cavity and the lower half terminal cavity of a terminal cavity; the molded case circuit breaker of the present invention further includes a terminal cover that cooperates with the wiring frame one by one. Each terminal cover includes two oppositely arranged terminal cover isolation side walls, and the two terminal cover isolation side walls are respectively arranged on both sides of the wiring frame, improving insulation and separating the wiring frame from the housing joint of the body housing 1a. For the molded case circuit breaker of the present invention, the setting of the terminal cover can significantly increase the creepage distance, ensure the insulation between each pole chamber, and improve the electrical safety.

[0048] Further, as shown in Figure 2 , 14 -22, each of the terminal covers further includes a terminal cover limiting side wall, and the terminal cover limiting side walls are respectively connected to the two terminal cover isolation side walls. The terminal cover limiting side walls are arranged on one side of the inner port of the wiring frame of the wiring frame, that is, on the side close to the inside of the molded case circuit breaker. The two ends of the terminal cover limiting side walls are respectively in limit fit with the cover 10a and the base 11a, ensuring the assembly reliability of the terminal cover, thereby preventing the occurrence of a reduction in creepage distance caused by the detachment of the terminal cover. Further, as shown in Figure 2 , 14 -22, the terminal includes a first terminal 5-0 and a second terminal 5-1. First terminal cavities and second terminal cavities are respectively provided at both ends of each pole chamber. The first terminal 5-0 is arranged in the first terminal cavity, and the second terminal 5-1 is arranged in the second terminal cavity. The first terminal 5-0 includes a first wiring frame 5-00, and the second terminal 5-1 includes a second wiring frame 5-10; an arc extinguishing chamber 1-0 is further provided in each pole chamber, and the arc extinguishing chamber air outlet of the arc extinguishing chamber 1-0 faces the first terminal 5-0; the terminal cover includes a first terminal cover 4-0 and a second terminal cover 4-1, which are respectively matched with the first terminal 5-0 and the second terminal 5-1; one end of the first connection plate 5-03 of the first terminal 5-0 is inserted into the first wiring frame 5-00, and the other end is connected to the internal circuit of the pole chamber; one end of the second connection plate 5-13 of the second terminal 5-1 is inserted into the second wiring frame 5-10, and the other end is connected to the internal circuit of the pole chamber. Further, as shown in Figures 14 - 17 : The first terminal cover 4-0 includes two relatively arranged first terminal cover isolation side walls 4-01 and a first terminal cover limiting side wall 4-03. The two first terminal cover isolation side walls 4-01 are arranged on both sides of the first wiring frame 5-00. The first terminal cover limiting side wall 4-03 is respectively connected to the two first terminal cover isolation side walls 4-01 and is arranged on one side of the inner port of the first wiring frame 5-00 of the first wiring frame. The two ends are respectively in limit fit with the cover 10a and the base 11a; one end of the first terminal cover limiting side wall 14-03 that is in limit fit with the base 11a abuts against the first connection plate 5-03. The other end of the first terminal cover limiting side wall 4-03 protrudes on one side of the first wiring frame 5-00 to form a terminal cover arc extinguishing grid part, and a plurality of exhaust holes 4-04 are provided in the terminal cover arc extinguishing grid part. The terminal cover arc extinguishing grid part can significantly improve the exhaust efficiency of the arc extinguishing chamber inside the circuit breaker, which is beneficial to improving the arc extinguishing effect of the arc extinguishing chamber 1-0. Further, as shown in Figure 15 and 17As shown, the first terminal cover 4-0 further includes an arc isolation plate 4-06, which is disposed on the side of the arc extinguishing grid portion of the terminal cover away from the arc extinguishing chamber 1-0; the first terminal cover 4-0 further includes a top wall 4-02 of the first terminal cover, and the top wall 4-02 of the first terminal cover is disposed above the top wall of the first wiring frame 5-0. An isolation plate limiting groove 4-05 is provided at the connection between the top wall 4-02 of the first terminal cover and the limiting side wall 4-03 of the first terminal cover, and one end of the arc isolation plate 4-06 is inserted into the isolation plate limiting groove 4-05. In the molded case circuit breaker of the present invention, one end of the arc isolation plate 4-06 is limited, and the other end will undergo a certain deformation when the arc extinguishing chamber 1-0 extinguishes the arc and exhausts gas, so that the high-temperature gas can be smoothly discharged from the circuit breaker through the arc extinguishing grid portion of the terminal cover, and at the same time, the protection level and sealing performance of the molded case circuit breaker are ensured; in addition, in the molded case circuit breaker of the present invention, when the arc extinguishing chamber is not provided in the pole chamber, the arc isolation plate 4-06 can be installed on the first terminal cover 4-0, which is beneficial to improving the protection effect.

[0049] It should be noted that, as Figure 1 and 2 shown, according to actual needs, the molded case circuit breaker of the present invention further includes an electric operating device 2, and the electric operating device 2 includes a slider 26-0, and the slider 26-0 is drivingly engaged with the handle 30 of the operating mechanism 3 to drive the handle 30 to swing, so that the molded case circuit breaker is closed / open.

[0050] Preferably, as Figures 8 - 11 shown, another improvement point of the molded case circuit breaker of the present invention is that: the molded case circuit breaker of the present invention further includes a locking device 6, and the locking device 6 includes a rotatably disposed locking member 63; when the molded case circuit breaker is in the open state, the slider 26-0 is located at the open position, and the locking member 63 is rotated to be in limiting cooperation with the slider 26-0 to prevent the slider 26-0 from sliding, so as to prevent the molded case circuit breaker from being accidentally closed. Further, as Figure 10 and 11 shown, when the molded case circuit breaker is in the closed state, the slider 26-0 is located at the closed position, and the slider 26-0 is in limiting cooperation with the locking member 63 to prevent the locking member 63 from rotating. At this time, the molded case circuit breaker cannot be locked. In the molded case circuit breaker of the present invention, the locking device 6 is directly in limiting cooperation with the slider 26-0 through the locking member 63, so that once the slider 26-0 is locked, the molded case circuit breaker cannot be closed, thus ensuring the safety of the user's electricity consumption.

[0051] Preferably, as Figures 4 - 7As shown in the figure, another improvement point of the molded case circuit breaker of the present invention lies in that: the slider 26-0 is an integral structure, including a slider driven groove 26-00 and a slider driving groove 26-01. The cam 25-6 of the electric operating device 2 is in driving cooperation with the slider driven groove 26-00, and the handle 30 of the operating mechanism 3 is inserted into the slider driving groove 26-01. For the molded case circuit breaker of the present invention, its slider 26-0 is an integral structure, with reliable and firm structure, ensuring the reliable operation of the electric operating device 2. Further, as Figure 6 shown in the figure, the molded case circuit breaker of the present invention further includes a slide rail 26-1 for limiting and guiding the slider 26-0. The slide rail 26-1 includes two strip-shaped rails arranged relatively parallel and respectively arranged on both sides of the slider 26-0. The slider 26-0 includes a first rail block 26-050 and a second rail block 26-051 arranged oppositely. The first rail block 26-050 and the second rail block 26-051 limit the strip-shaped rail between the first rail block 26-050 and the second rail block 26-051. The assembly of the slider 26-0 and the slide rail 26-1 is simple and the limiting is reliable, which is beneficial to improving the production efficiency and reliability of the product.

[0052] As Figure 1 , 2 and Figure 14 show an embodiment of the molded case circuit breaker of the present invention.

[0053] As Figure 1 , 2 and Figure 14 show, the molded case circuit breaker of the present invention includes a circuit breaker body 1 and an electric operating device 2. The circuit breaker body 1 includes an operating mechanism 3. The operating mechanism 3 includes a handle 30. The electric operating device 2 includes a slider 26-0. The slider 26-0 is in driving cooperation with the handle 30. The slider 26-0 reciprocates to drive the handle 30 to swing, so that the molded case circuit breaker is closed / open. The circuit breaker body 1 further includes a body housing 1a. The body housing 1a includes a cover 10a and a base 11a joined together. A plurality of pole chambers are arranged side by side and spaced apart inside the body housing 1a. Each pole chamber is provided with a terminal cavity at each end, and each terminal cavity is provided with a wiring terminal. A moving contact and a static contact are provided in the middle of each pole chamber, and an arc extinguishing chamber 1-0 is provided for cooperating with the moving contact and the static contact. The operating mechanism 3 is drivingly connected to the moving contact of one of the pole chambers. This moving contact is the main moving contact, and the moving contacts of other pole chambers are linked with the main moving contact. A plurality of moving contacts can be installed on the contact rotating shaft to be linked.

[0054] Specifically, as Figure 1 , 2As shown in Fig. 14, the molded case circuit breaker of the present invention is a three-pole circuit breaker, that is, the body housing 1 is provided with three pole chambers arranged side by side at intervals. The operating mechanism 3 is drivingly connected to the moving contact of the middle pole chamber, and the moving contacts of the two side pole chambers are respectively interlocked with the moving contact of the middle pole chamber. All three moving contacts are installed on the same contact rotating shaft, and the operating mechanism is drivingly connected to the contact rotating shaft.

[0055] Preferably, as Figure 1 、 8 -13 shows, the molded case circuit breaker of the present invention further includes a locking device 6. When the molded case circuit breaker is in the open state, the locking device 6 is operated to be in limiting cooperation with the slider 26-0 to prevent the slider 26-0 from sliding.

[0056] As Figures 1 - 11 shown, it is an embodiment of the electric operating device 2.

[0057] Preferably, as Figures 2 - 7 shown, the electric operating device 2 includes a rotatably arranged turntable 25-5, a cam 25-6 arranged on the turntable 25-5, an integrally structured slider 26-0, and a slide rail 26-1 for limiting and guiding the slider 26-0; the slider 26-0 includes a slider driven groove 26-00 and a slider driving groove 26-01. The cam 25-6 is drivingly cooperated with the slider driven groove 26-00, and the handle 30 is inserted into the slider driving groove 26-01; the turntable 25-5 rotates and drives the slider 26-0 to reciprocate along the slide rail 26-1 through the cam 25-6. The slider 26-0 drives the handle 30 to swing through the slider driving groove 26-01 to close / open the molded case circuit breaker. Further, as Figure 6 and 7 shown, the slider driven groove 26-00 is arranged at one end of the slider 26-0, the slider driving groove 26-01 is arranged in the middle of the slider 26-0, and the slider driving groove 26-01 and the slider driven groove 26-00 are respectively located on both sides of the slider 26-0, on the upper and lower sides (front and back) of the slider 26-0 respectively. Further, as Figure 7 shown, the slider driving groove 26-01 includes a closing driving side surface 26-011 and an opening driving side surface 26-010 which are oppositely arranged and are respectively drivingly cooperated with the handle 30, which is beneficial to improving the reliability of the cooperation between the slider 26-0 and the handle 30.

[0058] Specifically, as Figure 3 and 4In the shown direction, the driven slot 26-00 of the slider is arranged at the upper right end of the slider 26-0, and the driving slot 26-01 of the slider is arranged in the middle of the lower side of the slider 26-0; the turntable 25-5 rotates, and can drive the slider 26-0 to slide left and right through the cam 25-6 and the driven slot 26-00 of the slider, and the slider 26-0 drives the handle 30 to swing left and right, so as to realize the switching between the closing and opening states of the molded case circuit breaker.

[0059] Preferably, as Figures 1 - 3 shown, the electric operating device 2 further includes a motor 25-3, a transmission gear set 25-4 and a transmission main shaft 25-0 which are sequentially drivingly connected, the transmission main shaft 25-0 is drivingly connected with the turntable 25-5, and drives the turntable 25-5 to rotate.

[0060] Preferably, as Figures 6 - 11 shown, the molded case circuit breaker further includes a fourth micro switch 22-4, the fourth micro switch 22-4 is a reset micro switch, the slider 26-0 is integrally in a square structure, and includes a slider trigger structure 26-02 arranged at one of its vertices; when the molded case circuit breaker is in the closing state, the slider 26-0 is located at the closing position, and the slider trigger structure 26-02 drives the fourth micro switch 22-4 to close, and the fourth micro switch 22-4 transmits a closing signal to the circuit board 21 of the electric operating device 2; when the molded case circuit breaker is in the opening state, the slider 26-0 is located at the opening position, and the slider trigger structure 26-02 is away from the fourth micro switch 22-4 to make it open; when the molded case circuit breaker is in the tripping state, the slider trigger structure 26-02 is also away from the fourth micro switch 22-4 to make it open. Further, as Figure 6 and 7 shown, the electric operating device 2 further includes a slider return spring (not shown in the figure), a slider spring connection hole 26-06 is arranged on the slider trigger structure 26-02 of the slider 26-0, one end of the slider return spring is connected with the slider spring connection hole 26-06, and the other end is fixedly arranged, providing a pulling force for the slider 26 in a direction the same as the sliding direction when the slider 26-0 drives the molded case circuit breaker to open.

[0061] Specifically, as Figure 9 shown, when the molded case circuit breaker is in the opening state, the slider 26-0 is located at the lower position (opening position), the slider trigger structure 26-02 is away from the fourth micro switch 22-04, and no longer presses the driving rod of the fourth micro switch 22-4, so that the fourth micro switch 22-4 is opened; as Figure 11 shown, when the molded case circuit breaker is in the closing state, the slider 26-0 is located at the upper position (closing position), the slider trigger structure 26-02 presses the driving rod of the fourth micro switch 22-4, so that the fourth micro switch 22-4 is closed.

[0062] Preferably, as shown in Figure 7 , 9 , as shown in Fig. 11, the slider 26-0 further includes a slider locking structure 26-03; when the molded case circuit breaker is in the open state, the slider 26-0 is located at the open position, and the operating locking member 63 is rotated to be in limit fit with the slider locking structure 26-03, which can prevent the slider 26-0 from sliding and prevent misclosing operation; when the molded case circuit breaker is in the closed state, the slider 26-0 is located at the closed position, and the slider locking structure 26-03 is in limit fit with the locking member 63 to prevent the locking member 63 from rotating, and at this time, the circuit breaker cannot be locked.

[0063] Preferably, as shown in Figure 6 , the slide rail 26-1 includes two strip-shaped rails arranged relatively parallel and respectively arranged on both sides of the slider 26-0; as shown in Figure 7 , the slider 26-0 includes a first rail block 26-050 and a second rail block 26-051 arranged oppositely, and the first rail block 26-050 and the second rail block 26-051 limit the strip-shaped rail between the first rail block 26-050 and the second rail block 26-051. Specifically, as shown in the direction of Figure 7 , the first rail block 26-050 and the second rail block 26-051 are provided on both the left side and the right side of the rail block 26-0, and the first rail block 26-050 and the second rail block 26-051 on the same side are arranged staggeredly, that is, the gap between two adjacent second rail blocks 26-051 is opposite to a first rail block 26-050, and the gap between two adjacent first rail blocks 26-050 is opposite to a second rail block 26-051. The left side and the right side of the slider 26-0 are respectively opposite to a strip-shaped rail, and each strip-shaped rail is limited between the first rail block 26-050 and the second rail block 26-051.

[0064] Preferably, as shown in Figure 1 , the electric operating device 2 further includes a circuit board 21 connected to the motor 25-3, which provides working power supply and control signals for the motor 25-3. Further, as shown in Figure 1 , the circuit board 21, the turntable 25-5, the slider 26-0 and the circuit breaker body 1 are arranged in sequence from top to bottom. The circuit board 21 is arranged on one side of the transmission main shaft 25-0. This layout not only makes the structure of the molded case circuit breaker more compact, but also the circuit board 21 is far away from the circuit breaker body 1, ensuring the reliable operation of the entire electric operating device 2.

[0065] Preferably, as shown in Figures 2 - 6As shown, the electric operating device 2 further includes a slider bracket. The slider 26-0 is disposed in the middle of the slider bracket. The slider bracket includes an upper bracket 20-3 and a lower bracket 20-2 which are oppositely arranged. The upper bracket 20-3 includes an upper bracket main board 20-30, an upper bracket first arm 20-31 and an upper bracket second arm 20-32 which are bent and connected to both ends of the upper bracket main board 20-30 respectively. Upper bracket limit platforms 20-33 are provided at the free ends of the upper bracket first arm 20-31 and the upper bracket second arm 20-32. The lower bracket 20-2 includes a lower bracket main board 20-20, a lower bracket first arm 20-21 and a lower bracket second arm 20-22 which are bent and connected to both ends of the lower bracket main board 20-20 respectively. Lower bracket limit holes 20-23 are provided at the joints of the lower bracket main board 20-20 and the lower bracket first arm 20-21, and at the joints of the lower bracket main board 20-20 and the lower bracket second arm 20-22. The upper bracket main board 20-30 faces the lower bracket main board 20-20. The upper bracket first arm 20-31 and the lower bracket first arm 20-21 are stacked together to form a first side wall of the bracket. The upper bracket second arm 20-32 and the lower bracket second arm 20-22 are stacked together to form a second side wall of the bracket. The upper bracket first arm 20-31 and the upper bracket second arm 20-32 are located between the lower bracket first arm 20-21 and the lower bracket second arm 20-22. Each upper bracket limit platform 20-33 is inserted into a lower bracket limit hole 20-23. Further, as Figure 2 and 6 shown, both ends of the strip-shaped track of the slide rail 26-1 are fixedly connected to the first side wall and the second side wall of the bracket respectively.

[0066] Preferably, as Figure 6 and 8 shown, the slider bracket further includes a bracket avoidance hole 20-4 provided on the first side wall of the bracket. When the plastic case circuit breaker is in the open state, the free end of the slider locking structure 26-03 of the slider 26-0 is inserted into the bracket avoidance hole 20-4.

[0067] Preferably, as Figure 2 and 3 shown, the electric operating device 2 further includes a bracket plate 20-5. The bracket plate 20-5 is arranged in parallel and at intervals with the upper bracket main board 20-30. The transmission gear set 25-4 is disposed between the bracket plate 20-5 and the upper bracket main board 20-30. The transmission main shaft 25-0 is rotatably connected to the bracket plate 20-5 and the upper bracket main board 20-30 respectively.

[0068] Specifically, as Figure 2 、 3As shown in FIGS. 6, the upper bracket 20-3 and the lower bracket 20-4 are both formed by bending and stamping a metal plate, and both are in a U-shaped structure. The bracket plate 20-5, the upper bracket 20-3, and the lower bracket 20-2 are arranged in sequence from top to bottom, and the lower bracket 20-2 is fixedly connected to the main body housing 1a.

[0069] Preferably, as Figures 1 - 3 shown, the electric operating device 2 further includes an indicating disk 25-1 mounted on the transmission main shaft 25-0 and rotating coaxially therewith. The indicating disk 25-1 is used to indicate the opening and closing states of the circuit breaker. The molded case circuit breaker further includes a switching push rod 24-0 which is slidably arranged and can block and avoid the transmission main shaft 25-0. Further, as Figures 1 - 3 shown, the molded case circuit breaker further includes a first micro switch 22-1 and a second micro switch 22-2, which are a travel micro switch and a manual / automatic switching micro switch respectively. The first micro switch 22-1 is in driving cooperation with the indicating disk 25-1, and the second micro switch 22-2 is in driving cooperation with the switching push rod 24-0. Specifically, as Figure 1 shown, when the switching push rod 24-0 blocks the transmission main shaft 25-0, the user cannot operate the transmission main shaft 25-0 with the rocker. The switching push rod 24-0 is away from the second micro switch 22-2, and the second micro switch 22-2 is closed. When the switching push rod 24-0 avoids the transmission main shaft 25-0, the user can operate the transmission main shaft 25-0 with the rocker. The switching push rod 24-0 presses the driving rod of the second micro switch 22-2, and the second micro switch 22-2 is disconnected. The second micro switch 22-2 is connected in the driving circuit of the motor 25-3. At this time, the automatic opening and closing operation cannot be performed through the motor, realizing the manual / automatic switching. Specifically, as Figure 5 shown, the indicating disk 25-1 includes two semi-circles, and the radius of one semi-circle is greater than the radius of the other semi-circle. When the semi-circle with the smaller radius is opposite to the first micro switch 22-1, the driving rod of the first micro switch 22-1 is released. When the semi-circle with the larger radius is opposite to the first micro switch 22-1, the driving rod of the first micro switch 22-1 is pressed, so that the first micro switch 22-1 switches between closing and opening, and is used to transmit an electric signal indicating opening and closing to the circuit board 21 of the electric operating device 2. Combining the signals transmitted by the first micro switch 22-1 and the fourth micro switch 22-4, the state of the molded case circuit breaker (i.e., the closing state, the opening state, and the tripping state) can be judged.

[0070] Preferably, as Figure 1 、 8, as shown in FIGS. 10, the electric operating device 2 further includes a device bracket 20-1. The device bracket 20-1, the slider bracket, and the circuit breaker body 1 are arranged in sequence and connected in sequence. The driving main shaft 25-0 is arranged in the middle of the device bracket 20-1. The switching push rod 24-0 is slidably arranged on the device bracket 20-1, above the driving main shaft 25-0. The locking device 6 is rotatably connected to the device bracket 20-1. The first microswitch 22-1 and the second microswitch 22-2 are arranged on one side of the device bracket 20-1. The fourth microswitch 22-4 that is drivingly engaged with the slider 26-0 is arranged on the other side of the device bracket 20-1. The fourth microswitch 22-4 and the slider bracket are on the same side of the device bracket 20-1. Specifically, as Figure 1 shown in the direction, the device bracket 20-1, the slider bracket, and the circuit breaker body 1 are arranged in sequence from top to bottom and connected in sequence. The first microswitch 22-1 and the second microswitch 22-2 are arranged on the upper side of the device bracket 20-1. The fourth microswitch 22-4 is arranged on the lower side of the device bracket 20-1.

[0071] As Figures 8 - 13 shown, it is an embodiment of the locking device 6.

[0072] Preferably, as Figures 8 - 11 shown, the locking device 6 includes a rotatably arranged locking member 63. When the molded case circuit breaker is in the open state, the slider 26-0 is in the open position. Operate the locking member 63 to rotate to be in limit cooperation with the slider 26-0 to prevent the slider 26-0 from sliding. When the molded case circuit breaker is in the closed state, the slider 26-0 is in the closed position. The slider 26-0 is in limit cooperation with the locking member 63 to prevent the locking member 63 from rotating.

[0073] Preferably, as Figure 13 shown, the locking member 63 includes a locking boss 631. The locking boss 631 includes a locking boss surface 6310. As Figure 10 and 11 shown, when the molded case circuit breaker is in the open state, operate the locking member 63 to rotate so that the locking boss surface 6310 is perpendicular to the sliding direction of the slider 26-0 and is in limit cooperation with the slider 26-0 to prevent the slider 26-0 from sliding and prevent misclosing operation. As Figure 8 and 9 shown, when the molded case circuit breaker is in the closed state, the locking boss surface 6310 is parallel to the sliding direction of the slider 26-0. The slider 26-0 is in limit cooperation with the locking boss surface 6310 to prevent the locking member 63 from rotating and cannot operate to limit the slider 26-0. Further, as Figure 7As shown, the slider 26-0 includes a slider locking structure 26-03. The slider locking structure 26-03 includes a first limiting side surface 26-030 and a first locking side surface 26-031 that are perpendicular to each other. The first limiting side surface 26-030 is in limiting cooperation with the locking convex table surface 6310 to prevent the locking member 63 from rotating, and the locking convex table surface 6310 is in limiting cooperation with the first locking side surface 26-031 to prevent the slider 26-0 from sliding.

[0074] Preferably, as Figure 8 and 10 shown, the molded case circuit breaker of the present invention further includes a third micro switch 22-3, which is a locking micro switch and is in driving cooperation with the locking device 6. Further, as Figure 8 、 10 、13 shown, the locking member 63 includes a locking member driving protrusion 632, and the locking device 6 is in driving cooperation with the third micro switch 22-3 through the locking member driving protrusion 632. Further, as Figure 1 、 8 、10 shown, the third micro switch 22-3, the first micro switch 22-1 and the second micro switch 22-2 are arranged on the same side of the device bracket 20-1.

[0075] Specifically, as Figure 10 and 11 shown, when the molded case circuit breaker of the present invention is in the closed state, the locking convex table surface 6310 is parallel to the first limiting side surface 26-030 and they are in limiting cooperation. The locking member 63 cannot rotate and cannot operate to limit the slider 26-0. At this time, the locking member driving protrusion 632 is away from the driving rod of the third micro switch 22-3; as Figure 8 and 9 shown, when the molded case circuit breaker of the present invention is in the open state, after operating the locking member 63 to rotate, the locking convex table surface 6310 is parallel to the first locking side surface 26-031 and they are in limiting cooperation. The slider 26-0 is limited and cannot slide to the closing position. At this time, the locking member driving protrusion 632 presses against the driving rod of the third micro switch 22-3, and the third micro switch 22-3 provides an electrical signal indicating whether the locking device 6 locks the open state and does not allow closing.

[0076] Preferably, as Figure 12 shown, the locking device 6 includes a lock core 60, a washer 61, a positioning member 62 and a locking member 63; the device bracket 20-1 of the electric operating device 2 further includes a locking device mounting hole. The positioning member 62 is inserted into the locking device mounting hole. One end of the locking device 6 is the socket end of the lock core 60, which protrudes from one side of the device bracket 20-1, and an annular platform is provided on the outside of this end. The annular platform and the washer 61 are respectively located on both sides of the device bracket 20-1 and are in limiting cooperation with the device bracket 20-1 respectively. The locking member 63 is arranged at the other end of the locking device 6 and is linked with the lock core 60. Further, asFigure 13 As shown, the locking member 63 includes a cylindrical locking member body 630, a locking member driving projection 632 and a locking boss 631 provided at two radial ends of the locking member body 630. The locking member driving projection 632 and the locking boss 631 are also respectively located at two axial ends of the locking member body 630. A locking member assembly hole for cooperating with the lock core 60 is provided in the middle of the locking member body 630.

[0077] Specifically, as Figure 12 shown, the lock core 60 passes through the positioning member 62 and is drivingly connected to the locking member 63. The washer 61 is sleeved outside the positioning member 62. The positioning member 62 is provided with a positioning member limiting plane, which is in limiting cooperation with the device bracket 20-1 to prevent the positioning member 62 from rotating together with the lock core 60.

[0078] As Figure 6 and 7 shown, it is an embodiment of the slider 26-0.

[0079] As Figure 6 and 7 shown, the slider 1 is of an integral structure and is in an overall square structure. It includes a slider body, a slider driven groove 26-00, a slider driving groove 26-01, a slider triggering structure 26-02, a first track block 26-050 and a second track block 26-051. The slider driven groove 26-00 is provided at one end of the slider body, the slider driving groove 26-01 is provided in the middle of the slider body, and the slider driven groove 26-00 and the slider driving groove 26-01 are respectively provided on the front and back sides of the slider body. A pair of side walls of the slider body are respectively arranged opposite to two strip-shaped tracks of the slide rail 26-1. A plurality of first track blocks 26-050 and a plurality of second track blocks 26-051 are respectively provided at both ends of each side wall. The first track blocks 26-050 and the second track blocks 26-051 are arranged opposite to each other and are staggeredly distributed. The slider triggering structure 26-02 is provided at a vertex of the slider body and is arranged away from the slider driven groove 26-00. A slider spring connection hole 26-06 is provided on the slider triggering structure 26-02. Further, as Figure 7 shown, the slider driving groove 26-01 includes a closing driving side surface 26-011 and a tripping driving side surface 26-010 which are arranged opposite to each other and are respectively in driving cooperation with the handle 30. Further, as Figure 6 and 7 shown, the slider 1 further includes a slider locking structure 26-03. The slider locking structure 26-03 and the slider triggering structure 26-02 are respectively located at a pair of vertices of the slider body. Further, as Figure 7 shown, the slider locking structure 26-03 includes a first limiting side surface 26-030 and a first locking side surface 26-031 which are perpendicular to each other.

[0080] Specifically, as Figure 7 shown in the direction, with Figure 7 the left, right, front, and back sides of [component] being respectively the left, right, front, and back sides of the slider 26-0, and with Figure 7 the side facing the reader and the side facing away from the reader being respectively the lower side and the upper side of the slider 26-0; the driven slot 26-00 of the slider is provided at the rear end of the upper side of the slider 26-0, and the driving slot 26-01 of the slider is provided in the middle of the lower side of the slider 26-0; on each of the left and right sides of the slider body, there are provided a plurality of first track blocks 26-050 and a plurality of second track blocks 26-051; the trigger structure 26-02 of the slider is provided at the left front top corner of the slider body, and the locking structure 26-03 of the slider is provided at the right rear top corner of the slider body; the front and rear end faces of the driving slot 26-01 of the slider are respectively the opening driving side face 26-010 and the closing driving side face 26-011.

[0081] The following will combine Figures 1 - 2 Figs. 14-22 to describe the terminal cover, the cooperation between the terminal cover and the main body housing 1a, and the cooperation between the terminal cover and the terminal block.

[0082] As Figures 1 - 2 shown in Figs. 14, 21-22, each of the terminal cavities is composed of an upper half terminal cavity provided on the cover 10a and a lower half terminal cavity provided on the base 11a. Each terminal block includes a wiring frame, and both ends of each wiring frame are respectively provided in the upper half terminal cavity and the lower half terminal cavity of a terminal cavity; the molded case circuit breaker of the present invention further includes a terminal cover that cooperates with the wiring frame one by one. Each terminal cover includes oppositely arranged terminal cover isolation side walls, and the two terminal cover isolation side walls are respectively provided on both sides of the wiring frame, improving insulation and isolating the housing joint seam between the wiring frame and the main body housing 1a. Specifically, as Figure 1 shown, the main body housing 1a is formed by joining the cover 10a and the base 11a, and there must be a gap at the joint between the two (i.e., the housing joint seam, which includes not only the gap at the side wall of the main body housing 1a but also the joint seam of the pole chamber side walls between the pole chambers in the middle of the main body housing 1a). Further, as shown in Figs. Figure 2 and 14 21-22, when the wiring frame is installed in the terminal cavity, the lower half of the wiring frame is located in the lower half terminal cavity, and the upper half is located in the upper half terminal cavity, resulting in the side wall of the wiring frame being opposite to the gaps between the cover 10a and the base 11a. Compared with the structure in the traditional wiring frame that is entirely immersed in the base, the creepage distance is reduced. In the molded case circuit breaker of the present invention, its terminal cover increases the creepage distance, and the isolation side wall isolates the housing joint seam between the wiring frame and the main body housing 1a, improving the insulation of the molded case circuit breaker and the electrical safety of users.

[0083] Preferably, as Figures 15 - 22As shown, each of the terminal covers further includes a terminal cover limiting sidewall, which is respectively connected to two terminal cover isolation sidewalls. The terminal cover limiting sidewall is disposed on one side of the inner port of the wiring frame, and its two ends are respectively in limit cooperation with the cover 10a and the base 11a, ensuring the reliable installation of the terminal cover and preventing the terminal cover from falling off.

[0084] Preferably, as Figure 15 and 20 shown, a connection plate for connecting the terminal and the internal circuit of the pole chamber is inserted in each of the wiring frames. The connection plates are stacked on the bottom wall of the wiring frame, and one end of the terminal cover limiting sidewall that is in limit cooperation with the base 11a abuts against the connection plate.

[0085] Specifically, as Figure 2 、 14 -22 shown, the terminal includes a first terminal 5-0 and a second terminal 5-1. A first terminal cavity and a second terminal cavity are respectively provided at both ends of each pole chamber. The first terminal 5-0 is disposed in the first terminal cavity, and the second terminal 5-1 is disposed in the second terminal cavity. The first terminal 5-0 includes a first wiring frame 5-00, and the second terminal 5-1 includes a second wiring frame 5-10; the arc extinguishing chamber outlet of the arc extinguishing chamber 1-0 is opposite to the first terminal 5-0; the terminal cover includes a first terminal cover 4-0 and a second terminal cover 4-1, which are respectively in cooperation with the first terminal 5-0 and the second terminal 5-1; the connection plates include a first connection plate 5-03 and a second connection plate 5-13. One end of the first connection plate 5-03 is inserted into the first wiring frame 5-00, and one end of the second connection plate 5-13 is inserted into the second wiring frame 5-10.

[0086] Preferably, as Figure 16 and 17 shown, the first terminal cover 4-0 includes two relatively arranged first terminal cover isolation sidewalls 4-01 and a first terminal cover limiting sidewall 4-03. The two first terminal cover isolation sidewalls 4-01 are disposed on both sides of the first wiring frame 5-00. The first terminal cover limiting sidewall 4-03 is respectively connected to the two first terminal cover isolation sidewalls 4-01, is disposed on one side of the inner port of the first wiring frame 5-00, and its two ends are respectively in limit cooperation with the cover 10a and the base 11a; one end of the first terminal cover limiting sidewall 4-03 that is in limit cooperation with the base 11a abuts against the first connection plate 5-03, and the other end of the first terminal cover limiting sidewall 4-03 protrudes from one side of the first wiring frame 5-00 to form a terminal cover arc extinguishing grid portion, and a plurality of exhaust holes 4-04 are provided in the terminal cover arc extinguishing grid portion.

[0087] Preferably, as Figure 21 and 22As shown, the first terminal cavity includes a first upper half terminal cavity 101b provided on the cover 10a and a first lower half terminal cavity 101a provided on the base 11a. On both inner end side walls of the first lower half terminal cavity 101a, there is a first lower limit groove 102a respectively. At the inner end of the first upper half terminal cavity 101b, there is a first upper limit groove 102b in a U-shaped structure. The two side edges at the lower end of the first terminal cover limit side wall 4-03 are respectively in limit fit with the two first lower limit grooves 102a, and the two side edges and the top edge at the upper end of the first terminal cover limit side wall 4-03 are respectively in limit fit with the first upper limit groove 102b.

[0088] Preferably, as Figures 15 - 17 shown, the first terminal cover 4-0 further includes an arc isolation plate 4-06, and the arc isolation plate 4-06 is arranged on the side of the arc extinguishing grid part of the terminal cover away from the arc extinguishing chamber 1-0. Further, as Figures 15 - 17 shown, the first terminal cover 4-0 further includes a first terminal cover top wall 4-02, which is arranged on the upper side of the top wall of the first wiring frame 5-00. At the connection part of the first terminal cover top wall 4-02 and the first terminal cover limit side wall 4-03, there is an arc isolation plate limit groove 4-05, and one end of the arc isolation plate 4-06 is inserted into the arc isolation plate limit groove 4-05.

[0089] Preferably, as Figure 15 shown, the arc extinguishing chamber 1-0 includes a plurality of arc extinguishing grid pieces arranged side by side. One end of the first connecting plate 5-03 is inserted into the first wiring frame 5-00, and the other end passes through the middle of the arc extinguishing chamber 1-0 and is connected to the internal circuit of the pole chamber, dividing the plurality of arc extinguishing grid pieces into two parts.

[0090] Preferably, the first wiring terminal 5-0 further includes a first wiring screw 5-01. The first wiring screw 5-01 is threadedly connected to the top wall of the first wiring frame 5-00. The first terminal cover top wall 4-02 of the first terminal cover 4-0 is provided with a first terminal cover avoidance groove 4-020 for avoiding the first wiring screw 5-01.

[0091] Specifically, as Figures 14 - 15 shown, the upper end and the lower end of the first terminal cover limit side wall 4-03 are respectively in limit fit with the cover 10a and the base 11a. The part of the first terminal cover limit side wall 4-03 protruding above the first wiring terminal 5-00 is the terminal cover arc extinguishing grid part; the right end of the first wiring frame 5-00 is the first wiring frame inner port; the left end of the first connecting plate 5-03 is inserted into the first wiring frame 5-00 and is stacked with the bottom wall of the first wiring frame 5-00, and the right end passes through the middle of the arc extinguishing chamber 1-0 and is connected to the internal circuit of the pole chamber. The multiple arc extinguishing grid pieces of the arc extinguishing chamber 1-0 are arranged side by side at intervals from top to bottom. As Figure 21 and 22As shown, the lower end of the first lower half terminal cavity 101a is its inner end (the end close to the middle of the pole chamber), and the lower end of the first upper half terminal cavity 101b is its inner end (the end close to the middle of the pole chamber).

[0092] Preferably, as Figures 18 - 22 shown, the second terminal cover 4-1 includes two relatively arranged second terminal cover isolation side walls 4-11 and a second terminal cover limiting side wall 4-13. The two second terminal cover isolation side walls 4-11 are arranged on both sides of the second wiring frame 5-10. The second terminal cover limiting side wall 4-13 is respectively connected to the two second terminal cover isolation side walls 4-11, is arranged on one side of the inner port of the second wiring frame 5-10 of the second wiring frame, and is respectively in limit fit with the cover 10a and the base 11a at both ends. One end of the second terminal cover limiting side wall 4-13 in limit fit with the base 11a abuts against the second connecting plate 5-13, and the other end of the second terminal cover limiting side wall 4-13 is arranged close to the top wall of the second wiring frame 5-10. Further, as Figure 21 and 22 shown, the second terminal cavity includes a second lower half terminal cavity 103a arranged on the base 11a and a second upper half terminal cavity 103b arranged on the cover 10a. Each of the two side walls at the inner end of the second lower half terminal cavity 103a is provided with a second lower limiting groove 104a, and the inner end of the second upper half terminal cavity 103b is provided with a second upper isolation wall 104b. The two side edges at the lower end of the second terminal cover limiting side wall 4-13 are respectively in limit fit with the two second lower limiting grooves 104a, and the top side edge of the second terminal cover limiting side wall 4-13 abuts against the second upper isolation wall 104b. Further, as Figure 18 shown, the second terminal 5-1 further includes a second wiring screw 5-11, and the second wiring screw 5-11 is threadedly connected to the second wiring frame 5-10; the second terminal cover 4-1 further includes a second terminal cover top wall 4-12, the second terminal cover top wall 4-12 is arranged on the upper side of the top wall of the second wiring frame 5-10, and the second terminal cover top wall 4-12 is provided with a second terminal cover avoidance groove 4-120 for avoiding the second wiring screw 5-11.

[0093] As Figure 16 and 17 shown, it is an embodiment of the first terminal cover 4-0.

[0094] As Figure 16 and 17As shown, the first terminal cover 4-0 includes two relatively arranged first terminal cover isolation side walls 4-01, a first terminal cover limiting side wall 4-03, and a first terminal cover top wall 4-02; the first terminal cover top wall 4-02 and the two first terminal cover isolation side walls 4-01 form a U-shaped structure as a whole. The first terminal cover limiting side wall 4-03 is arranged on the same side as the first terminal cover isolation side walls 4-01 and is connected to each of them respectively, enclosing a first terminal cover cavity 4-00 for accommodating the first wiring frame 5-00. One end of the first terminal cover limiting side wall 4-03 protrudes on one side of the first terminal cover top wall 4-02 to form a terminal cover arc extinguishing grid part, and a plurality of exhaust holes 4-04 are provided on the terminal cover arc extinguishing grid part. The other end of the first terminal cover limiting side wall 4-03 protrudes on one side of the first terminal cover isolation side wall 4-01, and a first terminal cover avoidance groove 4-020 is provided in the middle of the first terminal cover top wall 4-02.

[0095] Preferably, as Figure 16 and 17 shown, the width of the part of the first terminal cover limiting side wall 4-03 that cooperates with the base 11a > the width of the part of the first terminal cover limiting side wall 4-03 that cooperates with the cover 10a.

[0096] Preferably, as Figure 15 shown, the first terminal cover 4-0 further includes an arc isolation plate 4-06. The arc isolation plate 4-06 is arranged on the side of the terminal cover arc extinguishing grid part away from the arc extinguishing chamber 1-0 to block the exhaust holes 4-04; an arc isolation plate limiting groove 4-05 is provided at the connection of the first terminal cover top wall 4-02 and the first terminal cover limiting side wall 4-03, and one end of the arc isolation plate 4-06 is inserted into the arc isolation plate limiting groove 4-05.

[0097] As Figure 18 and 19 shown, it is an embodiment of the second terminal cover 4-1.

[0098] As Figure 18 and 19As shown, the second terminal cover 4-1 includes two relatively arranged second terminal cover isolation side walls 4-11, a second terminal cover limiting side wall 4-13, and a second terminal cover top wall 4-12; the second terminal cover top wall 4-12 and the two second terminal cover isolation side walls 4-11 form a U-shaped structure as a whole, and the second terminal cover limiting side wall 4-13 is arranged on the same side as the second terminal cover isolation side walls 4-11 and is respectively connected to the three, enclosing a second terminal cavity 4-10 for accommodating the second wiring frame 5-10. One end of the second terminal cover limiting side wall 4-13 is connected to the second terminal cover top wall 4-12 and is arranged close to the top wall of the second wiring frame 5-10. The other end of the second terminal cover limiting side wall 4-13 protrudes on one side of the second terminal cover isolation side walls 4-11, and a second terminal cover avoidance groove 4-120 is provided in the middle of the second terminal cover top wall 4-12.

[0099] Preferably, as Figure 19 and 20 shown, the width of the part of the second terminal cover limiting side wall 4-13 that cooperates with the base 11a > the width of the remaining part of the second terminal cover limiting side wall 4-13.

[0100] As Figure 21 and 22 shown, it is an embodiment of the body housing 1a.

[0101] As Figure 21 and 22As shown, the body housing 1a is composed of a base 11a and a cover 10a joined together. There are three pole chambers arranged side by side at intervals in the middle of the body housing 1a. Each pole chamber is composed of a lower half pole chamber provided on the base 11a and an upper half pole chamber provided on the cover 10a. Pole chamber side walls are provided between adjacent pole chambers, and each pole chamber side wall is composed of a lower half pole chamber side wall provided on the base 11a and an upper half pole chamber side wall provided on the cover 10a. The splicing joint between the two forms a housing joint; each of the said pole chambers includes a first terminal cavity and a second terminal cavity provided at both ends thereof, and an arc extinguishing chamber cavity provided in the middle of the pole chamber. The arc extinguishing chamber cavity is arranged close to and communicated with the first terminal cavity; the first terminal cavity includes a first lower half terminal cavity 101a provided on the base 11a and a first upper half terminal cavity 101b provided on the cover 10a; the second terminal cavity includes a second lower half terminal cavity 103a provided on the base 11a and a second upper half terminal cavity 103b provided on the cover 10a; the arc extinguishing chamber cavity includes a lower half arc extinguishing chamber cavity 100a provided on the base 11a and an upper half arc extinguishing chamber cavity 100b provided on the cover 10a; on both side walls at the connection of the first lower half terminal cavity 101a and the lower half arc extinguishing chamber cavity 100a, there is respectively provided a first lower limit groove 102a, and at the connection of the first upper half terminal cavity 101b and the upper half arc extinguishing chamber cavity 100b, there is provided a first upper limit groove 102b in a U-shaped structure; on both side walls at one end of the second lower half terminal cavity 103a close to the lower half arc extinguishing chamber cavity 100a, there is respectively provided a second lower limit groove 104a, and at one end of the second upper half terminal cavity 103b close to the upper half arc extinguishing chamber cavity 100b, there is provided a second upper isolation wall 104b.

[0102] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A molded case circuit breaker, which comprises a circuit breaker body (1). The circuit breaker body (1) includes a body housing (1a). The body housing (1a) includes a cover (10a) and a base (11a) joined together. The body housing (1a) further includes at least one pole chamber, and each pole chamber is provided with a terminal cavity at each end. Each terminal cavity is provided with a wiring terminal; and it is characterized in that: Each of the said terminal cavities is composed of an upper half terminal cavity provided on the cover (10a) and a lower half terminal cavity provided on the base (11a). Each wiring terminal includes a wiring frame, and both ends of each wiring frame are respectively arranged in the upper half terminal cavity and the lower half terminal cavity of a terminal cavity; the molded case circuit breaker further includes a terminal cover that is in one-to-one cooperation with the wiring frame. Each terminal cover includes two oppositely arranged terminal cover isolation side walls, and the two terminal cover isolation side walls are respectively arranged on both sides of the wiring frame; each of the said terminal covers further includes a terminal cover limiting side wall, and the terminal cover limiting side wall is respectively connected to the two terminal cover isolation side walls. The terminal cover limiting side wall is arranged on one side of the inner port of the wiring frame of the wiring frame, and both ends are in limiting cooperation with the cover (10a) and the base (11a).

2. The molded case circuit breaker according to claim 1, characterized in that: A connection plate for connecting the wiring terminal and the internal circuit of the pole chamber is inserted in each of the said wiring frames. The connection plates are stacked on the bottom wall of the wiring frame, and one end of the terminal cover limiting side wall that is in limiting cooperation with the base (11a) abuts against the connection plate.

3. The molded case circuit breaker according to claim 1, wherein: The wiring terminal includes a first wiring terminal (5-0) and a second wiring terminal (5-1). Each pole chamber is provided with a first terminal cavity and a second terminal cavity at both ends respectively. The first wiring terminal (5-0) is arranged in the first terminal cavity, and the second wiring terminal (5-1) is arranged in the second terminal cavity. The first wiring terminal (5-0) includes a first wiring frame (5-00), and the second wiring terminal (5-1) includes a second wiring frame (5-10); an arc extinguishing chamber (1-0) is further arranged in each of the said pole chambers, and the arc extinguishing chamber outlet of the arc extinguishing chamber (1-0) is opposite to the first wiring terminal (5-0); the terminal covers include a first terminal cover (4-0) and a second terminal cover (4-1), which are respectively in cooperation with the first wiring terminal (5-0) and the second wiring terminal (5-1); the molded case circuit breaker further includes a first connection plate (5-03) and a second connection plate (5-13). One end of the first connection plate (5-03) is inserted into the first wiring frame (5-00), and one end of the second connection plate (5-13) is inserted into the second wiring frame (5-10).

4. The molded case circuit breaker according to claim 3, wherein: The first terminal cover (4-0) includes two relatively arranged first terminal cover isolation side walls (4-01) and a first terminal cover limiting side wall (4-03). The two first terminal cover isolation side walls (4-01) are arranged on both sides of the first wiring frame (5-00). The first terminal cover limiting side wall (4-03) is connected to the two first terminal cover isolation side walls (4-01) respectively, and is arranged on one side of the inner port of the first wiring frame (5-00), and the two ends are in limit cooperation with the cover (10a) and the base (11a) respectively; one end of the first terminal cover limiting side wall (4-03) that is in limit cooperation with the base (11a) abuts against the first connection plate (5-03), and the other end of the first terminal cover limiting side wall (4-03) protrudes on one side of the first wiring frame (5-00) to form a terminal cover arc extinguishing grid part, and a plurality of exhaust holes (4-04) are provided in the terminal cover arc extinguishing grid part.

5. The molded case circuit breaker according to claim 4, characterized in that: The first terminal cavity includes a first upper half terminal cavity (101b) arranged on the cover (10a) and a first lower half terminal cavity (101a) arranged on the base (11a). Each of the inner end side walls of the first lower half terminal cavity (101a) is provided with a first lower limiting groove (102a), and the inner end of the first upper half terminal cavity (101b) is provided with a U-shaped first upper limiting groove (102b). The two side edges at the lower end of the first terminal cover limiting side wall (4-03) are in limit cooperation with the two first lower limiting grooves (102a) respectively, and the two side edges and the top edge at the upper end of the first terminal cover limiting side wall (4-03) are in limit cooperation with the first upper limiting groove (102b) respectively.

6. The molded case circuit breaker according to claim 3, wherein: The arc extinguishing chamber (1-0) includes a plurality of arc extinguishing grid sheets arranged side by side. The other end of the first connection plate (5-03) passes through the middle of the arc extinguishing chamber (1-0) and is connected to the internal circuit of the pole chamber, dividing the plurality of arc extinguishing grid sheets into two parts.

7. The molded case circuit breaker according to claim 4, characterized in that: The first terminal cover (4-0) further includes an arc isolation plate (4-06). The arc isolation plate (4-06) is arranged on the side of the terminal cover arc extinguishing grid part away from the arc extinguishing chamber (1-0) to block the exhaust holes (4-04); the first terminal cover (4-0) further includes a first terminal cover top wall (4-02). The first terminal cover top wall (4-02) is arranged on the upper side of the top wall of the first wiring frame (5-00). An arc isolation plate limiting groove (4-05) is provided at the connection between the first terminal cover top wall (4-02) and the first terminal cover limiting side wall (4-03), and one end of the arc isolation plate (4-06) is inserted into the arc isolation plate limiting groove (4-05).

8. The molded case circuit breaker according to claim 3, wherein: The second terminal cover (4-1) includes two relatively arranged second terminal cover isolation side walls (4-11) and a second terminal cover limiting side wall (4-13). The two second terminal cover isolation side walls (4-11) are arranged on both sides of the second wiring frame (5-10). The second terminal cover limiting side wall (4-13) is connected to the two second terminal cover isolation side walls (4-11) respectively, is arranged on one side of the inner port of the second wiring frame (5-10) of the second wiring frame, and is in limit cooperation with the cover (10a) and the base (11a) at both ends. One end of the second terminal cover limiting side wall (4-13) in limit cooperation with the base (11a) abuts against the second connection plate (5-13). The other end of the second terminal cover limiting side wall (4-13) is arranged close to the top wall of the second wiring frame (5-10).

9. The molded case circuit breaker according to claim 6, characterized in that: The second terminal cavity includes a second lower half terminal cavity (103a) arranged on the base (11a) and a second upper half terminal cavity (103b) arranged on the cover (10a). Each of the two inner side walls of the inner end of the second lower half terminal cavity (103a) is provided with a second lower limiting groove (104a). The inner end of the second upper half terminal cavity (103b) is provided with a second upper isolation wall (104b). The two side edges at the lower end of the second terminal cover limiting side wall (4-13) are in limit cooperation with the two second lower limiting grooves (104a) respectively. The top side edge of the second terminal cover limiting side wall (4-13) abuts against the second upper isolation wall (104b).

10. The molded case circuit breaker according to claim 3, wherein: The first terminal cover (4-0) includes two relatively arranged first terminal cover isolation side walls (4-01), a first terminal cover limiting side wall (4-03) and a first terminal cover top wall (4-02); the first terminal cover top wall (4-02) and the two first terminal cover isolation side walls (4-01) form a U-shaped structure as a whole, the first terminal cover limiting side wall (4-03) is arranged on the same side of the first terminal cover isolation side wall (4-01) and the first terminal cover limiting side wall (4-03) and is connected to the three respectively, enclosing a first terminal cover cavity (4-00) for accommodating the first wiring frame (5-00). One end of the first terminal cover limiting side wall (4-03) protrudes on one side of the first terminal cover top wall (4-02) to form a terminal cover arc extinguishing grid part, and a plurality of exhaust holes (4-04) are provided on the terminal cover arc extinguishing grid part. The other end of the first terminal cover limiting side wall (4-03) protrudes on one side of the first terminal cover isolation side wall (4-01), and a first terminal cover avoidance groove (4-020) is provided in the middle of the first terminal cover top wall (4-02); the width of the part of the first terminal cover limiting side wall (4-03) that cooperates with the base (11a) > the width of the part of the first terminal cover limiting side wall (4-03) that cooperates with the cover (10a); the first terminal cover (4-0) further includes an arc isolation plate (4-06), the arc isolation plate (4-06) is arranged on the side of the terminal cover arc extinguishing grid part away from the arc extinguishing chamber (1-0) to block the exhaust holes (4-04); an arc isolation plate limiting groove (4-05) is provided at the connection of the first terminal cover top wall (4-02) and the first terminal cover limiting side wall (4-03), and one end of the arc isolation plate (4-06) is inserted into the arc isolation plate limiting groove (4-05).

11. The molded case circuit breaker according to claim 3, wherein: The second terminal cover (4-1) includes two relatively arranged second terminal cover isolation side walls (4-11), a second terminal cover limiting side wall (4-13) and a second terminal cover top wall (4-12); the second terminal cover top wall (4-12) and the two second terminal cover isolation side walls (4-11) form a U-shaped structure as a whole, the second terminal cover limiting side wall (4-13) is arranged on the same side of the second terminal cover isolation side wall (4-11) and the second terminal cover limiting side wall (4-13) and is connected to the three respectively, enclosing a second terminal cavity (4-10) for accommodating the second wiring frame (5-10). One end of the second terminal cover limiting side wall (4-13) is connected to the second terminal cover top wall (4-12) and is arranged close to the top wall of the second wiring frame (5-10). The other end of the second terminal cover limiting side wall (4-13) protrudes on one side of the second terminal cover isolation side wall (4-11), and a second terminal cover avoidance groove (4-120) is provided in the middle of the second terminal cover top wall (4-12); the width of the part of the second terminal cover limiting side wall (4-13) that cooperates with the base (11a) > the width of the remaining part of the second terminal cover limiting side wall (4-13).

12. The molded case circuit breaker according to claim 3, characterized in that: In the middle of the main body housing (1a), there are three pole chambers arranged side by side at intervals. Each pole chamber is composed of a lower half pole chamber provided on the base (11a) and an upper half pole chamber provided on the cover (10a). There are pole chamber side walls between adjacent pole chambers, and the pole chamber side walls are each composed of a lower half pole chamber side wall provided on the base (11a) and an upper half pole chamber side wall provided on the cover (10a). The joint between the lower half pole chamber side wall and the upper half pole chamber side wall forms a housing joint; each of the said pole chambers includes a first terminal cavity and a second terminal cavity provided at both ends thereof, and an arc extinguishing chamber cavity provided in the middle of the pole chamber. The arc extinguishing chamber cavity is provided near and communicated with the first terminal cavity; the first terminal cavity includes a first lower half terminal cavity (101a) provided on the base (11a) and a first upper half terminal cavity (101b) provided on the cover (10a); the second terminal cavity includes a second lower half terminal cavity (103a) provided on the base (11a) and a second upper half terminal cavity (103b) provided on the cover (10a); the arc extinguishing chamber cavity includes a lower half arc extinguishing chamber cavity (100a) provided on the base (11a) and an upper half arc extinguishing chamber cavity (100b) provided on the cover (10a); on both side walls at the connection between the first lower half terminal cavity (101a) and the lower half arc extinguishing chamber cavity (100a), there is each a first lower limit groove (102a), and at the connection between the first upper half terminal cavity (101b) and the upper half arc extinguishing chamber cavity (100b), there is a first upper limit groove (102b) in a U-shaped structure; on both side walls at one end of the second lower half terminal cavity (103a) near the lower half arc extinguishing chamber cavity (100a), there is each a second lower limit groove (104a), and at one end of the second upper half terminal cavity (103b) near the upper half arc extinguishing chamber cavity (100b), there is a second upper isolation wall (104b).

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