breaker

Abstract

The present invention relates to the field of low-voltage electrical appliances, and in particular to a circuit breaker, which comprises a shell and a circuit breaker circuit arranged in the shell; the shell comprises a base, an upper cover and a first partition plate located between the base and the upper cover; the circuit breaker circuit comprises a button mechanism, an operating mechanism, a contact mechanism and a first control circuit board, and the contact mechanism comprises a moving contact and a static contact used in conjunction with each other; the button mechanism is inserted at one end of the shell and is connected to the driving of the operating mechanism, and the operating mechanism is connected to the moving contact drivingly; the operating mechanism and the contact mechanism are arranged on the first partition plate and are located between the first partition plate and the upper cover, and the first control circuit board is arranged between the base and the first partition plate; the circuit breaker of the present invention has a reasonable internal layout and is easy to assemble.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a circuit breaker. Background Art

[0002] The existing circuit breakers have the following problems:

[0003] 1. Due to the unreasonable layout of the internal components of the circuit breaker, the circuit breaker is too large to meet the installation requirements of a small space;

[0004] Second, the short-circuit protection mechanism of the existing circuit breaker has a large temperature rise and the production cost of the line components is high;

[0005] 3. The overload protection mechanism of the existing circuit breaker has too large a temperature rise when a large current flows through it;

[0006] 4. The installation space of the control circuit board of the existing circuit breaker is insufficient, which is not conducive to the installation and design of the control circuit board;

[0007] 5. Existing circuit breakers do not have reliable means for detecting the working status. Summary of the invention

[0008] The object of the present invention is to overcome the defects of the prior art and provide a circuit breaker with reasonable internal layout and simple assembly.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A circuit breaker comprises a shell and a circuit breaker circuit arranged in the shell; the shell comprises a base 1-1a, an upper cover 1-4a and a first partition 1-2a located between the base 1-1a and the upper cover 1-4a; the circuit breaker circuit comprises a button mechanism 2a, an operating mechanism 4a, a contact mechanism and a first control circuit board 5-1b, the contact mechanism comprises a moving contact 8-1a and a stationary contact 8-2a used in conjunction with each other; the button mechanism 2a is inserted at one end of the shell and is connected to the operating mechanism 4a for driving, and the operating mechanism 4a is connected to the moving contact 8-1a for driving; the operating mechanism 4a and the contact mechanism are arranged on the first partition 1-2a and are located between the first partition 1-2a and the upper cover 1-4a, and the first control circuit board 5-1b is arranged between the base 1-1a and the first partition 1-2a.

[0011] Preferably, the circuit breaker pole circuit also includes an overload protection mechanism 7a, which is arranged on the first partition 1-2a and located between the first partition 1-2a and the upper cover 1-4a. The overload protection mechanism 7a includes a bimetallic strip 7-1a and a driving link 7-2a. The first partition 1-2a includes a guide rail structure 1-21a. One end of the driving link 7-2a is driven and connected to the operating mechanism 4a, and the other end cooperates with the guide rail structure 1-21a and is driven and cooperated with one end of the bimetallic strip 7-1a.

[0012] Preferably, the guide rail structure 1-21a is a guide groove arranged on the first partition 1-2a.

[0013] Preferably, the circuit breaker circuit also includes a short-circuit protection mechanism 5a and an arc extinguishing chamber 6a arranged side by side, and the short-circuit protection mechanism 5a and the arc extinguishing chamber 6a are respectively arranged on the first partition 1-2a and are both located between the first partition 1-2a and the upper cover 1-4a; the overload protection mechanism 7a and the operating mechanism 4a are arranged side by side in the middle of the shell, the button mechanism 2a and the short-circuit protection mechanism 5a are respectively arranged on both sides of the operating mechanism 4a, and the arc extinguishing chamber 6a and the overload protection mechanism 7a are arranged relatively.

[0014] Preferably, the circuit breaker circuit also includes a first circuit breaker terminal 3-1b and a circuit breaker terminal plate 2b; the static contact 8-2a includes a static contact bridge 8-21a and a static contact point 8-20a arranged on the static contact bridge 8-21a; one end of the bimetallic strip 7-1a is connected to the static contact bridge 8-21a, one end of the circuit breaker terminal plate 2b is connected to the first circuit breaker terminal 3-1b, and the other end of the circuit breaker terminal plate 2b is connected to the middle part of the bimetallic strip 7-1a and the static contact bridge 8-21a through the first soft connection 9-1b and the second soft connection 9-2b respectively.

[0015] Preferably, the first partition 1-2a also includes an arc striking channel 9a cooperating with the arc extinguishing chamber 6a; the inlet of the arc extinguishing chamber 6a faces the operating mechanism 4a and cooperates with the contact mechanism, and the outlet of the arc extinguishing chamber 6a cooperates with the arc striking channel 9a.

[0016] Preferably, the arc striking channel 9a is provided with a plurality of vertical partition ribs 9-1a and a plurality of transverse partition ribs 9-2a, the plurality of vertical partition ribs 9-1a are arranged side by side and spaced apart at one end of the arc striking channel 9a close to the arc extinguishing chamber 6a, and the plurality of transverse partition ribs 9-2a are arranged at the other end of the arc striking channel 9a and are staggered and arranged side by side along the extension direction of the arc striking channel 9a; the extension direction of the vertical partition ribs 9-1a is consistent with the extension direction of the arc striking channel 9a, and the extension direction of the transverse partition ribs 9-2a intersects with the extension direction of the arc striking channel 9a.

[0017] Preferably, an output signal terminal 7-4b is provided at one end of the first control circuit board 5-1b away from the operating mechanism 4a, the base 1-1a includes a signal terminal assembly groove 1-13a, the first partition 1-2a includes a signal terminal limit platform 1-23a arranged at its one side end facing the base 1-1a, and the output signal terminal 7-4b is arranged in the signal terminal assembly groove 1-13a and limited between the base 1-1a and the signal terminal limit platform 1-23a.

[0018] Preferably, the output signal terminal 7-4b is a square columnar structure, and a positioning boss is provided on each of its pair of side walls, and a positioning groove is provided on each of the pair of side walls of the signal end assembly groove 1-13a, and the positioning boss and the positioning groove are limitedly matched.

[0019] Preferably, the operating mechanism 4a includes a transmission member 4-1a, a third connecting rod 4-2a, a locking member 4-3a, a rotating plate 4-4a and a jumping member 4-5a, the transmission member 4-1a and the rotating plate 4-4a are respectively pivoted on the first partition 1-2a, the locking member 4-3a and the jumping member 4-5a are respectively pivoted on the rotating plate 4-4a, the transmission member 4-1a is connected to the locking member 4-3a through the third connecting rod 4-2a, the rotating plate 4-4a is drivingly connected to the moving contact 8-1a, and the overload protection mechanism 7a and the short-circuit protection mechanism 5a of the circuit breaker are respectively drivingly coordinated with the jumping member 4-5a.

[0020] The circuit breaker of the present invention, wherein the first partition 1-2a and the base 1-1a cooperate to provide a larger assembly space for the first control circuit board 5-1b, which is convenient for the assembly of the first control circuit board 5-1b, and is convenient for the design of the first control circuit board 5-1b. Thirdly, the first partition 1-2a separates the first control circuit board 5-1b from the contact mechanism and the arc extinguishing chamber 6a, thereby minimizing the influence of the arc on the first control circuit board 5-1b, ensuring the stable operation of the first control circuit board 5-1b and extending its service life.

[0021] In addition, the arc striking channel 9a cooperates with the arc extinguishing chamber 6a to prevent the ionized gas or residual arc discharged from the arc extinguishing chamber 6a from damaging other components in the circuit breaker, which is beneficial to ensuring the stable operation of the circuit breaker and extending the service life of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the circuit breaker of the present invention;

[0023] Figure 2 It is a schematic diagram of the exploded structure of the circuit breaker of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the base and the control circuit board assembly of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the first partition and the circuit breaker of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the second partition, the circuit breaker terminal board, and the overload protection mechanism of the present invention;

[0027] Figure 6 is a schematic structural diagram of the second baffle of the present invention;

[0028] Figure 7 is a schematic structural diagram of the first baffle of the present invention;

[0029] Figure 8 It is a schematic diagram of the connection structure of the short-circuit protection mechanism, the circuit-breaking electrode conductive plate and the second circuit-breaking electrode terminal of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the short-circuit protection mechanism of the present invention;

[0031] Fig.10 It is a schematic diagram of the structure of the coil of the present invention;

[0032] Fig.11 It is a structural schematic diagram of the base of the present invention;

[0033] Fig.12 It is a structural schematic diagram of the upper cover of the present invention. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-12 The following embodiments are provided to further illustrate the specific implementation of the circuit breaker of the present invention. The circuit breaker of the present invention is not limited to the description of the following embodiments.

[0035] like Figure 1-4 As shown in 12, the circuit breaker of the present invention is preferably a plug-in circuit breaker, which includes a shell and a circuit breaker circuit arranged in the shell, the shell includes a base 1-1a and an upper cover 1-4a, the circuit breaker circuit includes a button mechanism 2a, an operating mechanism 4a and a contact mechanism, the contact mechanism includes a moving contact 8-1a and a static contact 8-2a used in conjunction with each other, the button mechanism 2a is inserted at one end of the shell and is connected to the operating mechanism 4a, and the operating mechanism 4a is connected to the moving contact 8-1a; pressing / pulling the button mechanism 2a drives the moving contact 8-1a and the static contact 8-2a to close / open through the operating mechanism 4a, so that the circuit breaker is closed / opened.

[0036] Preferably, Figure 1-4As shown, the circuit breaker of the present invention further includes a through-pole circuit arranged in the housing, and the through-pole circuit includes a through-pole wiring board 1b and a first through-pole wiring terminal 4-1b and a second through-pole wiring terminal 4-2b respectively connected to both ends of the through-pole wiring board 1b. That is, the through-pole circuit refers to the wiring terminals at both ends being directly connected by wires without setting a breakpoint.

[0037] Preferably, Figure 1-3 As shown, the circuit breaker pole circuit also includes an electric operating device 3a, which includes a motor 3-1a and a gear set 3-2a. The motor 3-1a cooperates with the operating mechanism 4a through the gear set 3-2a. The electric operating device 3a drives the moving contact 8-1a and the static contact 8-2a to close through the operating mechanism 4a, so that the circuit breaker is closed. Further, the electric operating device 3a drives the circuit breaker to open through the operating mechanism 4a, or the electric operating device 3a also drives the operating mechanism 4a to operate through the button mechanism 2a, so that the circuit breaker is opened.

[0038] Preferably, Figure 1-4 As shown, the circuit breaker pole circuit also includes a short circuit protection mechanism 5a, an overload protection mechanism 7a and an arc extinguishing chamber 6a; the short circuit protection mechanism 5a and the overload protection mechanism 7a are respectively driven and cooperated with the operating mechanism 4a, and when the circuit breaker is in a short circuit or overload fault, the operating mechanism 4a drives the circuit breaker to open or trip; the arc extinguishing chamber 6a cooperates with the contact mechanism to extinguish the arc generated when the moving contact 8-1a and the static contact 8-2a are closed / opened. It should be pointed out that according to actual needs, one or more of the short circuit protection mechanism 5a, the overload protection mechanism 7a and the arc extinguishing chamber 6a can be deleted.

[0039] Preferably, Figure 1-4 As shown, the circuit breaker circuit also includes a first circuit breaker terminal 3-1b and a second circuit breaker terminal 3-2b, and a contact mechanism, an overload protection mechanism 7a, and a short circuit protection mechanism 5a are connected in series between the first circuit breaker terminal 3-1b and the second circuit breaker terminal 3-2b. Figure 1 As shown, the first disconnecting pole terminal 3-1b, the overload protection mechanism 7a, the contact mechanism, the short-circuit protection mechanism 5a and the second disconnecting pole terminal 3-2b are connected in series in sequence.

[0040] Preferably, Figure 1As shown, the first circuit breaker terminal 3-1b and the button mechanism 2a are arranged side by side at one end of the shell, and the second circuit breaker terminal 3-2b is arranged at the other end of the shell; the operating mechanism 4a and the overload protection mechanism 7a are arranged in the middle of the shell; the short-circuit protection mechanism 5a and the arc extinguishing chamber 6a are arranged side by side; the button mechanism 2a and the short-circuit protection mechanism 5a are respectively located on both sides of the operating mechanism 4a, and the first circuit breaker terminal 3-1b and the arc extinguishing chamber 6a are located on both sides of the overload protection mechanism 7a; the short-circuit protection mechanism 5a is located between the second circuit breaker terminal 3-2b and the operating mechanism 4a. It should be pointed out that the positions of the overload protection mechanism 7a and the short-circuit protection mechanism 5a can be interchanged. Further, as Figure 2-4 As shown, the first straight-through pole terminal 4-1b and the first disconnecting pole terminal 3-1b are arranged at one end of the shell; the second straight-through pole terminal 4-2b and the second disconnecting pole terminal 3-2b are arranged side by side and spaced apart at the other end of the shell.

[0041] The main improvements of the circuit breaker of the present invention are as follows:

[0042] Preferably, Figure 1 , 2 As shown in Figures 4 and 5, the shell also includes a second partition plate 1-3a disposed between the base 1-1a and the upper cover 1-4a, and the second partition plate 1-3a and the button mechanism 2a are disposed side by side; the circuit breaker circuit also includes a circuit breaker terminal block 2b connected in series in the circuit breaker circuit, the motor 3-1a is disposed on the base 1-1a and is located between the base 1-1a and the second partition plate 1-3a, and the circuit breaker terminal block 2b is disposed on the second partition plate 1-3a and is located between the second partition plate 1-3a and the upper cover 1-4a. The position layout of the circuit breaker terminal block 2b, the second partition plate 1-3a and the motor 3-1a, and the position layout of the second partition plate 1-3a and the button mechanism 2a realize full utilization of the internal space of the shell, making the internal structure of the circuit breaker more compact, which is conducive to the miniaturization development trend of the circuit breaker. Further, as Figure 2 , 4 As shown in Figure 5, the second partition 1-3a includes a second partition outer section 1-30a and a second partition inner section 1-31a connected in sequence, and a terminal assembly groove is provided on each side of the second partition outer section 1-30a. The first disconnecting pole terminal 3-1b and the first direct-connecting pole terminal 4-1b are each arranged in a terminal assembly groove, and the motor 3-1a and the disconnecting pole terminal board 2b are respectively located on both sides of the second partition inner section 1-31a. The second partition 1-3a not only realizes the stacking arrangement of the first disconnecting pole terminal 3-1b and the first direct-connecting pole terminal 4-1b, but also ensures the insulation between the two, which makes the internal layout of the circuit breaker more compact and ensures the insulation performance of the circuit breaker.

[0043] Preferably, Figure 1-4As shown, the disconnecting pole terminal plate 2b is connected in series between the first disconnecting pole terminal 3-1b and the overload protection mechanism 7a.

[0044] Preferably, Figure 2 and 3 As shown, the circuit breaker of the present invention further includes a control circuit board group arranged in the housing, and the control circuit board group includes a first control circuit board 5-1b; Figure 2-4 As shown, the housing also includes a first partition 1-2a disposed between the base 1-1a and the upper cover 1-4a; the operating mechanism 4a, the contact mechanism, the short-circuit protection mechanism 5a, the overload protection mechanism 7a and the arc extinguishing chamber 6a are respectively disposed on the first partition 1-2a and are all located between the first partition 1-2a and the upper cover 1-4a, and the first control circuit board 5-1b is disposed on the base 1-1a and is located between the base 1-1a and the first partition 1-2a. The first partition 1-2a and the base 1-1a cooperate to provide a larger assembly space for the first control circuit board 5-1b, which is convenient for the assembly of the first control circuit board 5-1b, and is convenient for the design of the first control circuit board 5-1b. Thirdly, the first partition 1-2a separates the first control circuit board 5-1b from the contact mechanism and the arc extinguishing chamber 6a, thereby minimizing the influence of the arc on the first control circuit board 5-1b, ensuring the stable operation of the first control circuit board 5-1b and extending its service life. Furthermore, the first partition 1-2a and the second partition 1-3a cooperate to achieve the isolation of the first control circuit board 5-1b and the circuit breaker circuit, which is beneficial to further improve the stability and service life of the first control circuit board 5-1b.

[0045] Preferably, Figure 1 , 2 As shown in Figure 4, the first partition 1-2a also includes an arc striking channel 9a that cooperates with the arc extinguishing chamber 6a. The entrance of the arc extinguishing chamber 6a faces the operating mechanism 4a and cooperates with the contact mechanism, and the outlet of the arc extinguishing chamber 6a cooperates with the arc striking channel 9a. The arc striking channel 9a cooperates with the arc extinguishing chamber 6a to avoid the ionized gas or residual arc discharged from the arc extinguishing chamber 6a from damaging other components in the circuit breaker, which is beneficial to ensure the stable operation of the circuit breaker and extend the service life of the circuit breaker. Further, as Figure 1As shown, the arc striking channel 9a is provided with a plurality of vertical partition ribs 9-1a and a plurality of transverse partition ribs 9-2a, the plurality of vertical partition ribs 9-1a are arranged side by side and spaced apart at one end of the arc striking channel 9a close to the arc extinguishing chamber 6a, and the plurality of transverse partition ribs 9-2a are arranged at the other end of the arc striking channel 9a and staggered along the extension direction of the arc striking channel 9a; the extension direction of the vertical partition ribs 9-1a is consistent with the extension direction of the arc striking channel 9a, and the extension direction of the transverse partition ribs 9-2a intersects with the extension direction of the arc striking channel 9a. The vertical partition ribs 9-1a and the transverse partition ribs 9-2a effectively cut the arc, which is beneficial to improving the arc extinguishing efficiency and arc extinguishing effect, and improving the arc extinguishing performance of the circuit breaker.

[0046] Preferably, Figure 2 and 3 As shown, the control circuit board group also includes a second control circuit board 5-2b stacked with the first control circuit board 5-1b, and the gear group 3-2a is arranged on the second control circuit board 5-2b and between the second control circuit board 5-2b and the upper cover 1-4a. Figure 2 and 3 As shown, the circuit breaker of the present invention further includes a first detection member 6-1b and a second detection member 6-2b respectively arranged on the second control circuit board 5-2b, which cooperate with the button mechanism 2a and the gear set 3-2a respectively. Figure 2 and 3 As shown, the first detection member 6-1b and the second detection member 6-2b are both micro switches. The first detection member 6-1b detects the position of the button mechanism 2a, and the second detection member 6-2b detects the position of the gear in the gear set, so that the working state of the circuit breaker (including the closing state, the opening state and the tripping state) can be judged from the output signals of the first detection member 6-1b and the second detection member 6-2b.

[0047] Preferably, Figure 8 and 9 As shown, the short-circuit protection mechanism 5a includes a skeleton 5-4a, a core assembly, a mandrel 5-1a, a coil 5-2a and a yoke 5-3a. The core assembly and the mandrel 5-1a are arranged in the middle of the skeleton 5-4a, the coil 5-2a is sleeved on the skeleton 5-4a, and the yoke 5-3a is wrapped around the outside of the coil 5-2a; the coil 5-2a is a U-shaped structure, which is connected in series with the contact mechanism. The short-circuit protection mechanism 5a has a simple structure and is easy to assemble, which is conducive to improving the assembly efficiency of the circuit breaker of the present invention. Further, the coil 5-2a includes a coil body 5-20a and a first welding foot 5-21a and a second welding foot 5-22a respectively connected to the two ends of the coil body 5-20a. The first welding foot 5-21a and the second welding foot 5-22a are relatively staggered, which is convenient for the connection of the coil 5-2a.

[0048] The circuit breaker of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] like Figure 1-4 , 12 is an embodiment of the circuit breaker of the present invention.

[0050] like Figure 1-4 As shown in , 12, the circuit breaker of the present invention is preferably a plug-in circuit breaker, which includes a shell and a breaking pole circuit and a through pole circuit respectively arranged in the shell.

[0051] like Figure 1-4 As shown, the circuit breaker circuit includes a button mechanism 2a, an electric operating device 3a, an operating mechanism 4a, a contact mechanism, a short-circuit protection mechanism 5a, an overload protection mechanism 7a, an arc extinguishing chamber 6a, a first circuit breaker terminal 3b-1 and a second circuit breaker terminal 3b-2; the electric operating device 3a includes a motor 3-1a and a gear set 3-2a, and the contact mechanism includes a moving contact 8-1a and a static contact 8-2a used in conjunction; the first circuit breaker terminal 3-1b, the overload protection mechanism 7a, the contact mechanism, the short-circuit protection mechanism 5a, and the second circuit breaker terminal 3-2b are connected in series in sequence; The short-circuit protection mechanism 5a and the overload protection mechanism 7a are respectively driven and cooperated with the operating mechanism 4a. When a short circuit or overload fault occurs in the circuit breaker, the short-circuit protection mechanism 5a or the overload protection mechanism 7a opens (or trips) the circuit breaker through the operating mechanism 4a; the arc extinguishing chamber 6a cooperates with the contact mechanism to extinguish the arc generated when the moving contact 8-1a and the static contact 8-2a are closed / opened; the button mechanism 2a is inserted at one end of the shell and is connected to the operating mechanism 4a. The motor 3-1a is driven and cooperated with the operating mechanism 4a through the gear set 3-2a, and the operating mechanism 4a is connected to the moving contact 8-1a. Further, in combination with Figure 1 As shown, pressing / pulling the button mechanism 2a can drive the moving contact 8-1a and the stationary contact 8-2a to close / open through the operating mechanism 4a, thereby closing / opening the circuit breaker; the electric operating device 3a drives the moving contact 8-1a and the stationary contact 8-2a to close / open through the operating mechanism 4a, and the electric operating device 3a drives the moving contact 8-1a and the stationary contact 8-2a to close / open through the button mechanism 2a and the operating mechanism 4a.

[0052] Specific, combined Figure 1As shown, the gear set 3-2a of the electric operating device 3a is directly driven and matched with the operating mechanism 4a (transmission member 4-1a of the operating mechanism 4a) to drive the circuit breaker to close; a gear in the gear set 3-2a of the electric operating device 3a is provided with a driving boss, and when the circuit breaker is closed, the driving boss is driven and matched with the button mechanism 2a to move the button mechanism 2a (the moving direction is the same as when the button mechanism 2a is pulled out) and the circuit breaker is opened through the operating mechanism 4a; during the process of the electric operating device 3a driving the circuit breaker to open / close, the motor 3-1a always rotates in the same direction. Of course, it should be pointed out that the electric operating device 3a can also be directly driven and matched with the operating mechanism 4a to close / open the circuit breaker, and the motor 3-1a rotates in the first direction to drive the circuit breaker to close, and rotates in the second direction to drive the circuit breaker to open, the first direction and the second direction are opposite to each other, which is the same as the principle of the electric operating device driving the circuit breaker to close / open in the prior art, and will not be repeated here.

[0053] Preferably, Figure 1 , 2 As shown in FIG. 4 , the disconnecting pole circuit further includes a disconnecting pole wiring board 2 b, which is connected in series between the first disconnecting pole terminal 3 - 1 b and the overload protection mechanism 7 a.

[0054] Preferably, Figure 1 , 2 As shown in Figures 4 and 8, the circuit breaker circuit further includes a circuit breaker conductive plate 8b, which is connected in series between the short circuit protection mechanism 5a and the second circuit breaker terminal 3-2b. Further, the circuit breaker conductive plate 8b is a manganese copper shunt.

[0055] like Figure 4 As shown, the through-pole circuit includes a through-pole wiring board 1b and a first through-pole wiring terminal 4-1b and a second through-pole wiring terminal 4-2b respectively arranged at two ends of the through-pole wiring board 1b.

[0056] Preferably, Figure 1-4As shown, the first circuit breaker terminal 3-1b, the first direct-through terminal 4-1b and the button mechanism 2a are located at the same end of the shell, and the second circuit breaker terminal 3-2b and the second direct-through terminal 4-2b are arranged side by side and spaced apart at the other end of the shell; the operating mechanism 4a and the overload protection mechanism 7a are arranged side by side in the middle of the shell, the arc extinguishing chamber 6a and the short-circuit protection mechanism 5a are arranged side by side, the electric operating device 3a and the button mechanism 2a are arranged side by side and are located between the first circuit breaker terminal 3-1b and the overload protection mechanism 7a, the gear set 3-2a is located between the motor 3-1a and the button mechanism 2a, the arc extinguishing chamber 6a is located between the overload protection mechanism 7a and the second direct-through terminal 4-2b, the short-circuit protection mechanism 5a is located between the operating mechanism 4a and the second circuit breaker terminal 3-2b, and the button mechanism 2a and the short-circuit protection mechanism 5a are respectively located on both sides of the operating mechanism 4a.

[0057] like Figure 1 , 2 , 4, and 5 show an embodiment of the disconnecting pole terminal board 2b: the disconnecting pole terminal board 2b includes an outer terminal board 2-5b, an outer transition board 2-2b, a main body board 2-1b, an inner transition board 2-3b, and an inner terminal board 2-4b which are sequentially connected. The outer transition board 2-2b, the main body board 2-1b, and the inner transition board 2-3b are integrally formed into a U-shaped structure. The outer terminal board 2-5b and the inner terminal board 2-4b extend toward the two ends of the disconnecting pole terminal board respectively. The outer terminal board 2-5a is connected to the first disconnecting pole terminal board 3-1b, and the inner terminal board 2-4b is connected to the overload protection mechanism 7a. Further, as Figure 5 As shown, the disconnecting pole terminal plate 2b includes two first limiting feet protruding from one side thereof and spaced apart. Figure 5 As shown, the disconnecting pole terminal plate 2b is an integrated structure, which is formed by punching and bending a metal plate.

[0058] Preferably, Figure 2 and 3 As shown, the circuit breaker of the present invention further includes a control circuit board group, and the control circuit board group includes a first control circuit board 5-1b and a second control circuit board 5-2b respectively arranged in the housing. Figure 2 , 3 As shown, the second control circuit board 5-2b and the first control circuit board 5-1b are stacked, the first control circuit board 5-1b is respectively arranged on the base 1-1a, and the second control circuit board 5-2b is located between the first control circuit board 5-1b and the upper cover 1-4a.

[0059] Preferably, Figure 2 and 3As shown, the first control circuit board 5-1b includes a first sampling element 7-1b and a second sampling element 7-2b, the first sampling element 7-1b is connected to the static contact 8-2a, and the second sampling element 7-2b is connected to the through-pole terminal board 1b. Figure 1 and 7 As shown, the first partition 1-2a includes a partition avoidance hole for avoiding the first sampling element 7-1b and located on the outer peripheral side wall of the arc striking channel 9a of the first partition 1-2a, and the first sampling element 7-1b is located in the partition avoidance hole; the second sampling element 7-2b is located between the side wall of the base 1-1a and the side wall of the first partition 1-2a.

[0060] Preferably, Figure 2 and 3 As shown, the first control circuit board 5-1b also includes a conductive plate connecting plug 7-3b, and the circuit breaker conductive plate 8b is connected to the conductive plate connecting plug 7-3b via a connecting wire.

[0061] Preferably, Figure 3 As shown, the first control circuit board 5-1b also includes a motor connection plug 7-5b, and the motor 3-1a is connected to the motor connection plug 7-5b via a connecting wire.

[0062] Preferably, Figure 2 and 3 As shown, the first control circuit board 5-1b further includes an output signal terminal 7-4b, which is disposed at one end of the first control circuit board 5-1b away from the operating mechanism 4a. Further, the output signal terminal 7-4b is a square columnar structure, and a positioning boss is provided on each of its pair of side walls.

[0063] Preferably, the first control circuit board 5-1b includes a protection circuit and a control circuit for the circuit breaker, which can be used for automatic opening and closing control, current and voltage sampling and monitoring, and external communication.

[0064] Specifically, Figure 2 In the direction shown, the first sampling element 7-1b, the second sampling element 7-2b, and the conductive plate connecting plug 7-3b are arranged at the lower end of the first control circuit board 5-1b, the first sampling element 7-1b and the second sampling element 7-2b are located on the left side of the lower end of the first control circuit board 5-1b, and the conductive plate connecting plug 7-3b is located on the right side of the lower end of the first control circuit board 5-1b; the motor connecting plug 7-5b is arranged at the upper end of the first control circuit board 5-1b; the output signal terminal 7-4a is arranged in the middle of the lower end of one side of the first control circuit board 5-1b.

[0065] Preferably, Figure 3As shown, the gear set 3-2a is arranged between the second control circuit board 5-2b and the upper cover 1-4a. Figure 3 As shown, in the gear set 3-2a, the rotating shaft of each gear passes through the second control circuit board 5-2b and is fixed on the base 1-1a.

[0066] Preferably, Figure 2 and 3 As shown, the circuit breaker of the present invention further includes a first detection member 6-1b and a second detection member 6-2b respectively arranged on the second control circuit board 5-2b, which cooperate with the button mechanism 2a and the gear set 3-2a respectively. Figure 2 and 3 As shown, the first detection member 6-1b and the second detection member 6-2b are both micro switches, and the arrangement directions of the first detection member 6-1b and the second detection member 6-2b are perpendicular. It should be pointed out that the arrangement directions of the first detection member 6-1b and the second detection member 6-2b are perpendicular, so that the swing plane of the driving rod of the first detection member 6-1b is perpendicular to the second control circuit board 5-2b, and the swing plane of the driving rod of the second detection member 6-2b is parallel to the second control circuit board 5-2b, so that the two can better cooperate with the button mechanism 2a and the gear set 3-2a respectively.

[0067] Preferably, Figure 3 As shown, the gear set 3-2a includes a final drive gear 3-20a drivingly matched with the operating mechanism 4a, and a gear drive boss is provided on one side of the final drive gear 3-20a drivingly matched with the second detection member 6-2b.

[0068] Specific, combined Figure 2 and 3 As shown, when the button mechanism 2a is pressed to close the circuit breaker through the operating mechanism 4a, the button mechanism 2a presses against the driving rod of the first detection member 6-1b, so that the first detection member 6-1b is triggered. When the button mechanism 2a is pulled out to open the circuit breaker through the operating mechanism 4a, the button mechanism 2a is separated from the driving rod of the first detection member 6-1b. When the electric operating device 3a drives the circuit breaker to close through the operating mechanism 4a, the gear driving boss presses against the driving rod of the second detection member 6-2b, and the second detection member 6-2b is triggered. When the electric operating device 3a drives the circuit breaker to open through the button mechanism 2a and the operating mechanism 4a, the gear driving boss releases the driving rod of the second detection member 6-2b.

[0069] Preferably, Figure 1-4 , 6-7, and 11-12 are an embodiment of the shell: the shell includes a base 1-1a, an upper cover 1-4a, and a first partition 1-2a and a second partition 1-3a respectively arranged between the base 1-1a and the upper cover 1-4a.

[0070] Preferably, Figure 1 , 2 As shown in , 4, and 7, the operating mechanism 4a, overload protection mechanism 7a, short-circuit protection mechanism 5a, and arc extinguishing chamber 6a are respectively arranged on the first partition 1-2a and located between the first partition 1-2a and the upper cover 1-4a, and the first control circuit board 5-1b is arranged on the base 1-1a and located between the base 1-1a and the first partition 1-2a; the second partition 1-3a and the button mechanism 2a are arranged side by side, the motor 3-1a is arranged on the base 1-1a and located between the second partition 1-3a, and the circuit breaker terminal board 2b is arranged on the second partition 1-3a and located between the second partition 1-3a and the upper cover 1-4a. Further, as Figure 1 , 4 As shown in Figures 5 and 6, the first circuit-breaking pole terminal 3-1b is arranged on one side of the second partition 1-3a and is located between the second partition 1-3a and the base 1-1a, and the first direct-through pole terminal 4-1b is arranged on the other side of the second partition 1-3a and is located between the second partition 1-3a and the upper cover 1-4a. The first direct-through pole terminal 4-1b and the first circuit-breaking pole terminal 3-1b are stacked along the thickness direction of the shell and are located on both sides of the second partition 1-3a.

[0071] Preferably, Fig.11 As shown, the base 1-1a includes a motor assembly cavity 1-10a arranged on its bottom wall, and the motor 3-1a is arranged in the motor assembly cavity 1-10a. The motor 3-1a is reliably limited between the second partition 1-3a and the base 1-1a to prevent the motor 3-1a from moving, which is also beneficial to reducing the volume of the circuit breaker.

[0072] Preferably, Figure 6 , 7 As shown in 11, one side of the through-pole connection plate 1b is respectively limited and matched with the first partition plate 1-2a and the second partition plate 1-3a, and the other side of the through-pole connection plate 1b is limited and matched with the base 1-1a. Figure 7 As shown, the first partition 1-2a includes a third limiting slot 1-22a, such as Figure 6 As shown, the second partition plate 1-3a includes a second limiting slot 1-33a, such as Fig.11 As shown, the base 1-1a includes a base limiting slot 1-12a, one side of the through-pole wiring board 1b is respectively plugged and limited with the second limiting slot 1-33a and the third limiting slot 1-22a, and the other side of the through-pole wiring board 1b is plugged and limited with the base limiting slot 1-12a. Specifically, as Fig.11 As shown, the base limiting slot 1-12a is set on a side wall of the base 1-1a, as shown in Figure 6As shown, the second limiting slot 1-33a is arranged on one side of the second partition 1-3a facing the base 1-1a, as shown in FIG. Figure 7 As shown, the third limiting slot 1-22a is arranged on a side edge of the first partition 1-2a facing the base 1-1a.

[0073] Preferably, Figure 5 As shown, the circuit breaker terminal plate 2b includes two first limit pins protruding from one side thereof and arranged at intervals, and the second partition plate 1-3a includes two first limit slots 1-32a arranged at intervals, and the two first limit pins are respectively inserted in the two first limit slots 1-32a.

[0074] Preferably, Figure 1 , 2 As shown in , the first partition 1-2a also includes an arc striking channel 9a that cooperates with the arc extinguishing chamber 6a; the entrance of the arc extinguishing chamber 6a faces the operating mechanism 4a and cooperates with the contact mechanism, and the contact of the arc extinguishing chamber 6a cooperates with the arc striking channel 9a. Further, as Figure 1 As shown, the arc striking channel 9a is provided with a plurality of vertical partition ribs 9-1a and a plurality of transverse partition ribs 9-2a. The plurality of vertical partition ribs 9-1a are arranged side by side and spaced apart at one end of the arc striking channel 9a close to the arc extinguishing chamber 6a, and the plurality of transverse partition ribs 9-2a are arranged at the other end of the arc striking channel 9a and are staggered and arranged side by side along the extension direction of the arc striking channel 9a; the extension direction of the vertical partition ribs 9-1a is consistent with the extension direction of the arc striking channel 9a, and the extension direction of the transverse partition ribs 9-2a is cross-sectional with (for example, perpendicular to) the extension direction of the arc striking channel 9a.

[0075] Preferably, Figure 3 , 7 As shown in Figure 11, the base 1-1a includes a signal terminal assembly groove 1-13a, the first partition 1-2a includes a signal terminal limit platform 1-23a arranged at its side end facing the base 1-1a, and the output signal terminal 7-4b is arranged in the signal terminal assembly groove 1-13a and limited between the base 1-1a and the signal terminal limit platform 1-23a.

[0076] Preferably, Figure 1 , 3 As shown in , 11 and 12, the housing further comprises a first installation guide rib 1-11a and a second installation guide rib 1-40a arranged side by side and spaced apart on one side thereof, and are arranged on the side wall of the base 1-1a and the side wall of the upper cover 1-4a respectively. Fig.11 and 12As shown, the first installation guide rib 1-11a and the second installation guide rib 1-40a both extend along the length direction of the housing. When the circuit breaker of the present invention is assembled to the installation cabinet or the distribution cabinet, the first installation guide rib 1-11a and the second installation guide rib 1-40a respectively cooperate with the cabinet body to limit the position, so as to prevent the circuit breaker from deviating from the correct position and / or being skewed, thereby affecting the normal operation of the circuit breaker.

[0077] like Figure 4-6 As shown, an embodiment of the second partition 1-3a is shown: the second partition 1-3a includes a second partition outer section 1-30a and a second partition inner section 1-31a connected in sequence, and a terminal assembly groove is provided on each side of the second partition outer section 1-30a, the first straight-through pole terminal 4-1b and the first circuit-breaking pole terminal 3-1b are respectively arranged in the two terminal assembly grooves, the circuit-breaking pole terminal plate 2b is arranged on the second partition inner section 1-31a and is located between the second partition inner section 1-31a and the upper cover 1-4a, and the motor 3-1a is arranged on the base 1-1a and is located between the base 1-1a and the second partition inner section 1-31a.

[0078] Preferably, Figure 4-6 As shown, the second partition inner section 1-31a includes a first transverse wall 1-310a and a first vertical wall 1-311a, the first transverse wall 1-310a is arranged in the middle of the first vertical wall 1-311a, the circuit breaker terminal board 2b and the motor 3-1a are respectively arranged on both sides of the first transverse wall 1-310a, and a second limiting slot 1-33a is provided on the side of the first vertical wall 1-311a facing the base 1-1a. Further, as Figure 6 As shown, a partition motor limiting groove is provided on the side of the first transverse wall 1-310a facing the base 1-1a.

[0079] Preferably, Figure 5 As shown, the second partition plate 1-3a further includes two first limiting slots 1-32a arranged at intervals. Figure 5 As shown, the two first limiting slots 1-32a are respectively located at the two ends of the second partition inner section 1-31a.

[0080] like Figure 1As shown, it is an embodiment of the button mechanism 2a: the button mechanism 2a comprises a button member 2-1a, a first connecting rod 2-2a, a connecting member 2-3a and a second connecting rod 2-4a which are connected in sequence, the button member 2-1a is slidably arranged on the housing, and the second connecting rod 2-4a is also drivingly connected to the rotating plate 4-4a of the operating mechanism 4a. It should be pointed out that the button member 2-1a, the first connecting rod 2-2a and the connecting member 2-3a can also be set as an integral component, but in order to better cooperate with the electric operating device 3a (for example, the electric operating device 3a is driven to cooperate with the connecting member 2-3, and the circuit breaker is opened through the operating mechanism 4a) and to facilitate the setting of a locking mechanism (for example, a locking mechanism to prevent the circuit breaker from being installed in the installation cabinet or the distribution cabinet in the closed state, or a locking mechanism to prevent the circuit breaker from being pulled out of the installation cabinet or the distribution cabinet in the closed state), the circuit breaker of the present invention preferably adopts the above-mentioned split button mechanism 2a.

[0081] like Figure 1 As shown, it is an embodiment of the operating mechanism 4a: the operating mechanism 4a includes a transmission member 4-1a, a third connecting rod 4-2a, a locking member 4-3a, a rotating plate 4-4a and a jumping member 4-5a, the transmission member 4-1a and the rotating plate 4-4a are respectively pivoted on the first partition 1-2a, the locking member 4-3a and the jumping member 4-5a are respectively pivoted on the rotating plate 4-4a, the transmission member 4-1a is connected to the locking member 4-3a through the third connecting rod 4-2a, the rotating plate 4-4a is drivingly connected to the moving contact 8-1a, and the overload protection mechanism 7a and the short-circuit protection mechanism 5a are respectively drivingly coordinated with the jumping member 4-5a.

[0082] like Figure 1 , 2 , 4, and 5 show an embodiment of the overload protection mechanism 7a: the overload protection mechanism 7a includes a bimetallic strip 7-1a and a driving link 7-2a, one end of the bimetallic strip 7-1a is connected to the stationary contact 8-2a, and the other end is drivingly connected to the tripping member 4-5a of the operating mechanism 4a through the driving link 7-2a. Figure 1 As shown, the first partition 1-2a includes a guide rail structure 1-21a, one end of the driving link 7-1a is drivingly connected to the tripping member 4-5a, and the other end cooperates with the guide rail structure 1-21a, thereby limiting and guiding the action path of the driving link 7-1a, ensuring the delayed tripping characteristics of the circuit breaker. Figure 1 As shown, the guide rail structure 1-21a is a guide groove arranged on the first partition plate 1-21a.

[0083] Preferably, Figure 5As shown, one end of the circuit breaker terminal plate 2b is connected to the first circuit breaker terminal plate 3-1b, and the other end is connected to the middle part of the bimetallic strip 7-1a and the static contact bridge 8-21a of the static contact 8-2a through the first soft connection 9-1b and the second soft connection 9-2b respectively. The above-mentioned shunting method can reduce the overall temperature rise of the circuit breaker.

[0084] like Figure 8-10 As shown, it is an embodiment of the short-circuit protection mechanism 5a: the short-circuit protection mechanism 5a includes a skeleton 5-4a, a core assembly, a push rod 5-1a, a coil 5-2a and a yoke 5-3a, the core assembly 5-0a, the spring and the push rod 5-1a are respectively arranged in the middle of the skeleton 5-4a, the coil 5-2a is sleeved on the skeleton 5-4a, the yoke 5-3a is wrapped around the outside of the coil 5-2a, and the coil 5-2a is a U-shaped structure. The structure of the coil 5-2a is simple, which meets the instantaneous tripping characteristics of the short-circuit protection mechanism 5a, can significantly reduce heat generation and has good heat dissipation, thereby ensuring the reliability of the short-circuit protection mechanism 5a. Further, the core assembly 5-0a includes a static iron core and a moving iron core, the spring is arranged between the static iron core and the moving iron core, and the push rod 5-1a and the moving iron core are linked.

[0085] Preferably, Fig.10 As shown, the coil 5-2a includes a coil body 5-20a and a first welding leg 5-21a and a second welding leg 5-22a respectively connected to both ends of the coil body 5-20a, and the first welding leg 5-21a and the second welding leg 5-22a are relatively staggered; the first welding leg 5-21a is welded to the yoke 5-3a and connected to the moving contact 8-1a through welding soft wires, and the second welding leg 5-22a is welded to one end of the disconnecting pole conductive plate 8b. The first welding leg 5-21a and the second welding leg 5-22a are respectively welded to the yoke 5-3a and the disconnecting pole conductive plate 8b, forming a reliable positioning for the coil 5-2a, which is convenient for the overall installation of the short-circuit protection mechanism 5a.

[0086] Preferably, Figure 1 and 2 As shown in Figure 9, the yoke 5-3a is a U-shaped structure, with its opening facing the side wall of the base 1-1a, and the opening of the U-shaped structure of the coil 5-2a faces the first partition 1-2a. The opening direction of the U-shaped structure of the yoke 5-3a is perpendicular to the opening direction of the U-shaped structure of the coil 5-2, which is beneficial to reducing the assembly space occupied by the short-circuit protection mechanism 5a.

[0087] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing and a circuit breaker pole circuit and a through pole circuit respectively arranged in the housing; the housing comprises a base (1-1a), an upper cover (1-4a) and a first partition (1-2a) located between the base (1-1a) and the upper cover (1-4a); the circuit breaker pole circuit comprises a button mechanism (2a), an operating mechanism (4a), a contact mechanism, a first control circuit board (5-1b) and an arc extinguishing chamber (6a); the contact mechanism comprises a movable contact (8-1a) and a stationary contact (8-2a) used in conjunction with each other; the button mechanism (2a) is inserted at one end of the housing and is drivingly connected to the operating mechanism (4a); the operating mechanism (4a) is drivingly connected to the movable contact (8-1a); Features: The operating mechanism (4a), the contact mechanism, and the arc extinguishing chamber (6a) are arranged on the first partition (1-2a) and are located between the first partition (1-2a) and the upper cover (1-4a); the first control circuit board (5-1b) is arranged between the base (1-1a) and the first partition (1-2a); The through-pole circuit comprises a through-pole wiring board (1b) and a first through-pole wiring terminal (4-1b) and a second through-pole wiring terminal (4-2b) respectively connected to two ends of the through-pole wiring board (1b); The disconnecting pole circuit also includes a first disconnecting pole terminal (3-1b) and a second disconnecting pole terminal (3-2b), and the contact mechanism is connected in series between the first disconnecting pole terminal (3-1b) and the second disconnecting pole terminal (3-2b); The housing further comprises a second partition (1-3a) arranged between the base (1-1a) and the upper cover (1-4a), the second partition (1-3a) being arranged side by side with the button mechanism (2a); the first disconnecting pole terminal (3-1b), the first direct-through pole terminal (4-1b) and the button mechanism (2a) are located at the same end of the housing, and the second disconnecting pole terminal (3-2b) and the second direct-through pole terminal (4-2b) are arranged side by side and spaced apart at the other end of the housing.

2. The circuit breaker according to claim 1, characterized in that: The disconnecting pole circuit also includes an overload protection mechanism (7a), which is arranged on the first partition (1-2a) and located between the first partition (1-2a) and the upper cover (1-4a), the overload protection mechanism (7a) includes a bimetallic strip (7-1a) and a driving connecting rod (7-2a), the first partition (1-2a) includes a guide rail structure (1-21a), one end of the driving connecting rod (7-2a) is drivingly connected to the operating mechanism (4a), and the other end cooperates with the guide rail structure (1-21a) and drivingly cooperates with one end of the bimetallic strip (7-1a).

3. The circuit breaker according to claim 2, characterized in that: The guide rail structure (1-21a) is a guide groove arranged on the first partition plate (1-2a).

4. The circuit breaker according to claim 2, characterized in that: The disconnecting pole circuit further comprises a short-circuit protection mechanism (5a) arranged side by side with the arc extinguishing chamber (6a); the short-circuit protection mechanism (5a) is arranged on the first partition (1-2a) and is located between the first partition (1-2a) and the upper cover (1-4a); the overload protection mechanism (7a) and the operating mechanism (4a) are arranged side by side in the middle of the housing; the button mechanism (2a) and the short-circuit protection mechanism (5a) are respectively arranged on both sides of the operating mechanism (4a); and the arc extinguishing chamber (6a) and the overload protection mechanism (7a) are arranged opposite to each other.

5. The circuit breaker according to claim 2, characterized in that: The disconnecting pole circuit also includes a disconnecting pole wiring board (2b); the static contact (8-2a) includes a static contact bridge (8-21a) and a static contact point (8-20a) arranged on the static contact bridge (8-21a); ​​one end of the bimetallic strip (7-1a) is connected to the static contact bridge (8-21a), one end of the disconnecting pole wiring board (2b) is connected to the first disconnecting pole wiring terminal (3-1b), and the other end of the disconnecting pole wiring board (2b) is connected to the middle of the bimetallic strip (7-1a) and the static contact bridge (8-21a) through a first flexible connection (9-1b) and a second flexible connection (9-2b), respectively.

6. The circuit breaker according to claim 4, characterized in that: The first partition plate (1-2a) further comprises an arc striking channel (9a) cooperating with the arc extinguishing chamber (6a); the inlet of the arc extinguishing chamber (6a) faces the operating mechanism (4a) and cooperates with the contact mechanism, and the outlet of the arc extinguishing chamber (6a) cooperates with the arc striking channel (9a).

7. The circuit breaker according to claim 6, characterized in that: A plurality of vertical partition ribs (9-1a) and a plurality of transverse partition ribs (9-2a) are arranged in the arc striking channel (9a); the plurality of vertical partition ribs (9-1a) are arranged side by side and spaced apart at one end of the arc striking channel (9a) close to the arc extinguishing chamber (6a); and the plurality of transverse partition ribs (9-2a) are arranged at the other end of the arc striking channel (9a) and are arranged in a staggered manner and side by side along the extension direction of the arc striking channel (9a); the extension direction of the vertical partition ribs (9-1a) is consistent with the extension direction of the arc striking channel (9a), and the extension direction of the transverse partition ribs (9-2a) intersects with the extension direction of the arc striking channel (9a).

8. The circuit breaker according to claim 1, characterized in that: An output signal terminal (7-4b) is provided at one end of the first control circuit board (5-1b) away from the operating mechanism (4a); the base (1-1a) comprises a signal terminal assembly groove (1-13a); the first partition (1-2a) comprises a signal terminal limit platform (1-23a) arranged at an end portion of a side thereof facing the base (1-1a); the output signal terminal (7-4b) is arranged in the signal terminal assembly groove (1-13a) and is limited between the base (1-1a) and the signal terminal limit platform (1-23a).

9. The circuit breaker according to claim 8, characterized in that: The output signal terminal (7-4b) is a square columnar structure, with a positioning boss provided on each of its pair of side walls, and a positioning groove provided on each of the pair of side walls of the signal end assembly groove (1-13a), wherein the positioning boss and the positioning groove are limitedly matched.

10. The circuit breaker according to claim 1, characterized in that: The operating mechanism (4a) comprises a transmission member (4-1a), a third connecting rod (4-2a), a locking member (4-3a), a rotating plate (4-4a) and a jumper member (4-5a); the transmission member (4-1a) and the rotating plate (4-4a) are respectively pivotally arranged on the first partition plate (1-2a); the locking member (4-3a) and the jumper member (4-5a) are respectively pivotally arranged on the rotating plate (4-4a); the transmission member (4-1a) is connected to the locking member (4-3a) via the third connecting rod (4-2a); the rotating plate (4-4a) is drive-connected to the moving contact (8-1a); and the overload protection mechanism (7a) and the short-circuit protection mechanism (5a) of the disconnecting pole circuit are respectively drive-coordinated with the jumper member (4-5a).

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