A residual current circuit breaker with interchangeable L / N pole positions

Abstract

A leakage circuit breaker with interchangeable L / N pole positions, characterized in that one end of a first L-pole conductor passes through a third wiring hole to be connected to a double gold sheet of a thermal trip mechanism, and the other end passes through the first wiring hole to be connected to a first terminal or directly to a third terminal; a second L-pole conductor passes through a zero-sequence current transformer, and one end passes through a fourth wiring hole to be connected to a coil of an electromagnetic trip mechanism, and the other end passes through a second wiring hole to be connected to a second terminal or directly to a fourth terminal; one end of a first N-pole conductor is connected to an N-pole moving contact of an N-pole contact mechanism, and the other end is connected to the third terminal or passes through the first wiring hole to be connected to the first terminal; a second N-pole conductor passes through a zero-sequence current transformer, and one end is connected to an N-pole static contact of an N-pole contact mechanism, and the other end is connected to the fourth terminal or passes through the second wiring hole to be connected to the second terminal. The advantages are that the connection ends of the first L-pole wire and the first N-pole wire are interchangeable, and similarly, the connection ends of the second L-pole wire and the second N-pole wire are also interchangeable, so that the position of the L pole and the N pole of the same product can be interchanged without changing the internal parts, reducing the cost of development and production and improving the level of internal control standardization of materials.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and in particular to a leakage circuit breaker with interchangeable L / N pole positions. Background Art

[0002] A Chinese utility model patent (CN 218849394 U) discloses a leakage circuit breaker, which includes a housing, a partition, a front cover, and a rear cover. The partition divides the housing into two adjacent chambers on the left and right, wherein a circuit breaker part is installed in one chamber and a leakage protection part is installed in the other chamber. Usually, the circuit breaker part is connected to the L pole, and the leakage protection part is connected to the N pole.

[0003] However, at present, in order to meet the needs of different customers and application scenarios, the above circuit breakers usually need to be designed in two different mirror images, one with the circuit breaker part on the left and the leakage protection part on the right, and the other with the circuit breaker part on the right and the leakage protection part on the left, so as to adapt to different situations where the N pole is on the left or the N pole is on the right. This leads to the problem of high design and manufacturing costs. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model provides a leakage circuit breaker with interchangeable L / N pole positions.

[0005] The technical solution adopted by the utility model is: a leakage circuit breaker with interchangeable L / N pole positions, comprising:

[0006] A shell, comprising two side covers and a middle cover, wherein the middle cover separates the shell into an L-pole side and an N-pole side;

[0007] A circuit breaker part, which is arranged on the L-pole side of the housing, and includes an operating mechanism, a thermal tripping mechanism, an electromagnetic tripping mechanism, an arc extinguishing mechanism, an L-pole contact mechanism, and a first wiring terminal and a second wiring terminal arranged on both sides of the housing;

[0008] A leakage protection part is arranged on the N-pole side of the housing, the leakage protection part includes a leakage tripping device composed of a zero-sequence current transformer, an electromagnetic tripping device, a leakage operating mechanism and a testing mechanism, the leakage protection part also includes an N-pole contact mechanism and a third wiring terminal and a fourth wiring terminal arranged on both sides of the housing;

[0009] The middle cover is formed with a plurality of wiring holes connecting the L-pole side and the N-pole side, including:

[0010] A first wiring hole, which is located below the first wiring terminal and the third wiring terminal;

[0011] A second wiring hole, which is located below the second wiring terminal and the fourth wiring terminal;

[0012] The third wiring hole corresponds to the double gold plates of the thermal release mechanism;

[0013] A fourth wiring hole, which corresponds to the electromagnetic tripping mechanism;

[0014] The N-pole side of the housing is provided with:

[0015] A first L-pole wire, one end of which passes through the third wiring hole and is connected to the double gold sheet of the thermal release mechanism, and the other end of which passes through the first wiring hole and is connected to the first wiring terminal or directly connected to the third wiring terminal;

[0016] A second L-pole conductor passes through the zero-sequence current transformer, and one end of the conductor passes through the fourth wiring hole to be connected to the coil of the electromagnetic tripping mechanism, and the other end passes through the second wiring hole to be connected to the second wiring terminal or directly connected to the fourth wiring terminal;

[0017] A first N-pole wire, one end of which is connected to the N-pole moving contact of the N-pole contact mechanism, and the other end of which is connected to the third wiring terminal or connected to the first wiring terminal after passing through the first wiring hole;

[0018] The second N-pole wire passes through the zero-sequence current transformer, and one end of the wire is connected to the N-pole static contact of the N-pole contact mechanism, and the other end is connected to the fourth terminal or is connected to the second terminal after passing through the second wiring hole.

[0019] The first wiring hole is communicated with the third wiring hole.

[0020] The leakage operating mechanism includes a handle, a connecting rod, a bracket, a jump buckle, a lock buckle, and a first elastic member. The bracket is rotatably mounted on the middle cover, the jump buckle and the lock buckle are rotatably mounted on the bracket, and the lock buckle and the jump buckle can be locked with each other. The handle is rotatably mounted on the housing and connected to the jump buckle through the connecting rod;

[0021] A first torsion spring mounting column is formed on the middle cover, a first torsion spring limiting boss is formed on one side of the first torsion spring mounting column, and a second torsion spring limiting boss protrudes backwards from the bracket; the first elastic member is a torsion spring, which is sleeved on the first torsion spring mounting column, one end of which is against the first torsion spring limiting boss, and the other end is against the second torsion spring limiting boss, which can provide a reset elastic force for the bracket.

[0022] The lock buckle comprises a first arm corresponding to the jump buckle and capable of being locked with the jump buckle, and a second arm corresponding to the electromagnetic releaser, wherein the second arm extends to the right side to form an elastic arm.

[0023] The N-pole contact mechanism also includes an N-pole moving contact bracket and a second elastic member; the N-pole moving contact bracket is coaxially pivoted with the N-pole moving contact on the middle cover, and the N-pole moving contact bracket is linked with the operating mechanism through a hinge shaft;

[0024] The N-pole moving contact bracket is formed with a torsion spring limiting groove, and the second elastic member adopts a torsion spring and is coaxially installed with the N-pole moving contact. One end of the second elastic member is stuck in the torsion spring limiting groove, and the other end is bent and abutted against the side wall of the N-pole moving contact, which can provide an elastic force for the N-pole moving contact.

[0025] The N-pole contact mechanism also includes an N-pole wiring board, which is fixedly installed in the housing, the first N-pole wire is connected to the N-pole wiring board, and the N-pole wiring board is connected to the N-pole moving contact through a wire.

[0026] The N-pole terminal plate extends outwardly to have a test contact boss;

[0027] The testing institutions include:

[0028] A test button, which is movably arranged on the housing;

[0029] The test torsion spring is fixedly arranged in the housing, and one end of the test torsion spring extends above the test contact boss and is connected to the test button.

[0030] The test mechanism also includes a cover plate, on which a torsion spring installation groove is provided, and the test torsion spring is installed in the torsion spring installation groove.

[0031] A resistor installation slot is also formed on the cover plate, a resistor is arranged in the resistor installation slot, and the resistor is connected to the test torsion spring.

[0032] The beneficial effect of the utility model is that: by adopting the above scheme, the connection ends of the first L-pole wire and the first N-pole wire are interchangeable, and similarly, the connection ends of the second L-pole wire and the second N-pole wire are also interchangeable, so that the position of the L pole and the N pole of the same product can be interchangeable without changing the internal parts, thereby reducing the cost of development and production and improving the level of material internal control standardization. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of a leakage circuit breaker according to an embodiment of the utility model.

[0034] Figure 2 It is a schematic structural diagram of the L-pole side of the leakage circuit breaker in an embodiment of the utility model.

[0035] Figure 3 It is a schematic structural diagram of the N-pole side of the leakage circuit breaker according to an embodiment of the utility model.

[0036] Figure 4 It is a schematic diagram of the structure of the leakage circuit breaker after the N-pole side of the leakage tripping device is removed according to the embodiment of the utility model.

[0037] Figure 5It is a schematic diagram of the structure of the N-pole side of the residual current circuit breaker of the utility model embodiment without the residual current tripping device and the N-pole contact mechanism.

[0038] Figure 6 It is a structural schematic diagram of the leakage operating mechanism and the testing mechanism of the embodiment of the utility model.

[0039] Figure 7 It is a schematic diagram of the exploded structure of part of the structure of the leakage operating mechanism of the embodiment of the utility model. DETAILED DESCRIPTION

[0040] The embodiments of the utility model are further described below in conjunction with the accompanying drawings.

[0041] As shown in the figure, a leakage circuit breaker with interchangeable L / N pole positions comprises a housing 1, wherein the housing 1 comprises two side covers 11 and a middle cover 12, wherein the middle cover 12 separates the housing 1 into an L pole side and an N pole side, wherein the circuit breaker part is installed on the L pole side of the housing 1, and the leakage protection part is installed on the N pole side of the housing 1. The middle cover 12 is formed with a plurality of wiring holes connecting the L pole side and the N pole side.

[0042] The circuit breaker part includes an operating mechanism 21, a thermal tripping mechanism 22, an electromagnetic tripping mechanism 23, an arc extinguishing mechanism 24, an L-pole contact mechanism 25, and a first terminal 26 and a second terminal 27 arranged on both sides of the housing 1. Among them, the thermal tripping mechanism 22 includes a double gold sheet, the electromagnetic tripping mechanism 23 includes a coil skeleton, a coil, a moving and a static iron core, etc., and the L-pole contact mechanism 25 includes an L-pole moving contact installed on the operating mechanism 21 and conductively connected to the double gold sheet, and an L-pole static contact fixed in the housing 1 and conductively connected to the coil. Since the overall layout and working principle of the circuit breaker part are basically similar to those of the prior art, some conventional structures will not be described in detail here.

[0043] The leakage protection part includes a leakage tripping device composed of a zero-sequence current transformer 3, an electromagnetic tripper 4, a leakage operating mechanism 5, and a testing mechanism 6, an N-pole contact mechanism, and a third terminal 31 and a fourth terminal 32 arranged on both sides of the housing 1. Among them, the N-pole contact mechanism includes an N-pole moving contact 71, an N-pole static contact 72, and an N-pole wiring board 73. The N-pole moving contact is rotatably installed in the housing and is linked with the operating mechanism of the circuit breaker part. The N-pole static contact is fixedly installed in the housing and corresponds to the N-pole moving contact. The N-pole wiring board 71 is fixedly installed in the housing and is conductively connected to the N-pole moving contact.

[0044] The N-pole side of the housing 1 is further provided with a first L-pole wire 81, a second L-pole wire 82, a first N-pole wire 91, and a second N-pole wire 92, wherein the first wiring hole 121 is located below the first wiring terminal 26 and the third wiring terminal 31, the second wiring hole 122 is located below the second wiring terminal 27 and the fourth wiring terminal 32, the third wiring hole 123 corresponds to the double gold sheet of the thermal trip mechanism 22, and the fourth wiring hole 124 corresponds to the electromagnetic trip mechanism 23.

[0045] Each of the above wires has two connection methods, one of which is as follows: one end of the first L-pole wire 81 passes through the third wiring hole 123 and is connected to the double gold sheet of the thermal trip mechanism 22, and the other end passes through the first wiring hole 121 and is connected to the first terminal 26; the second L-pole wire 82 passes through the zero-sequence current transformer 3, and one end thereof passes through the fourth wiring hole 124 and is connected to the coil of the electromagnetic trip mechanism 23, and the other end passes through the second wiring hole 122 and is connected to the second terminal 27; one end of the first N-pole wire 91 is connected to the N-pole moving contact of the N-pole contact mechanism, and the other end is connected to the third terminal 31; the second N-pole wire 92 also passes through the zero-sequence current transformer 3, and one end thereof is connected to the N-pole static contact of the N-pole contact mechanism, and the other end is connected to the fourth terminal 32.

[0046] Another wiring method is as follows: one end of the first L-pole wire 81 passes through the third wiring hole 123 to be connected to the double gold sheet of the thermal trip mechanism 22, and the other end is directly connected to the third terminal 31; one end of the second L-pole wire 82 passes through the fourth wiring hole 124 to be connected to the coil of the electromagnetic trip mechanism 23, and the other end is directly connected to the fourth terminal 32; one end of the first N-pole wire 91 is connected to the N-pole moving contact of the N-pole contact mechanism, and the other end passes through the first wiring hole 121 and is connected to the first terminal 26; one end of the second N-pole wire 92 is connected to the N-pole static contact of the N-pole contact mechanism, and the other end passes through the second wiring hole 122 and is connected to the second terminal 27, thereby realizing the interchangeability of the positions of the L pole and the N pole.

[0047] By adopting the above scheme, it is very convenient to interchange the connection end positions of the first L-pole wire and the first N-pole wire, and the connection end positions of the second L-pole wire and the second N-pole wire, so that the same product can realize two wiring methods without changing the internal parts, thereby realizing the interchangeability of the positions between the L pole and the N pole, reducing the development and production costs and improving the level of internal control standardization of materials.

[0048] Furthermore, the first wiring hole 121 and the third wiring hole 123 are horizontally connected, which not only facilitates wiring connection, but also allows the position of the double gold plate in the thermal trip mechanism 22 to be seen through the first wiring hole 121 and the third wiring hole 123 on the N-pole side. When adjusting the position of the double gold plate, the double gold plate can be accurately adjusted without completely disassembling the circuit breaker.

[0049] In addition, the N-pole contact mechanism also includes a moving contact bracket 74 and a second elastic member 75; the moving contact bracket 74 and the N-pole moving contact 71 are coaxially pivoted on the middle cover 12, and the moving contact bracket 74 is linked with the operating mechanism of the circuit breaker part through a hinge shaft 76; the moving contact bracket 74 is formed with a torsion spring limiting groove 741, and the second elastic member 75 adopts a torsion spring and is coaxially installed with the N-pole moving contact 71, one end of which is stuck in the torsion spring limiting groove 741, and the other end is bent and abutted against the side wall of the N-pole moving contact 71, which can provide an elastic force for the N-pole moving contact 71.

[0050] During the opening and closing actions, the operating mechanism of the circuit breaker part can drive the moving contact bracket 74 to rotate through the hinge shaft 76, and the moving contact bracket 74 drives the N-pole moving contact 71 synchronously, thereby realizing the opening and closing actions. Compared with the linkage method of the driving rod adopted in the conventional technology, not only the driving rod is omitted, the parts and connection relationships are reduced, the cost is reduced, and the assembly is more convenient, but also the above structure makes the position of the moving contact bracket 74 move up and away from the static contact assembly, and the corresponding length of the N-pole moving contact 71 is increased. When opening, the opening distance between the N-pole moving contact 71 and the N-pole static contact 72 is also larger, which ensures the arc separation and improves the breaking performance.

[0051] Among them, a first mounting column 127 is formed on the middle cover 12, and the moving contact bracket 74 is rotatably mounted on the first mounting column 127. A second mounting column 742 coaxial with the first mounting column 127 is formed on the moving contact bracket 74, and the N-pole moving contact 71 and the second elastic member 75 are both sleeved on the second mounting column 742. During installation, the moving contact bracket 74, the N-pole moving contact 71 and the second elastic member 75 are first assembled into one body, and then installed as a whole on the middle cover 12, which is very convenient to install.

[0052] In addition, the hinge shaft 76 adopts a steel shaft, and the hinge shaft 76 is integrally injection-molded on the lever of the operating mechanism 22. Conventional technology mostly adopts plastic materials and is integrally molded with the lever of the operating mechanism. However, since the hinge shaft is relatively long, the plastic material is prone to bending and deformation, and the structure is unstable. Therefore, after being changed to a steel shaft, the structure is more stable and reliable.

[0053] The leakage operating mechanism 5 includes a handle 51, a connecting rod 52, a bracket 53, a jump buckle 54, a lock buckle 55, and a first elastic member 56. The bracket 53 is rotatably mounted on the middle cover 12, the jump buckle 54 and the lock buckle 55 are rotatably mounted on the bracket 53, and the lock buckle 55 and the jump buckle 54 can be locked with each other. The handle 51 is rotatably mounted on the shell and is connected to the jump buckle 54 through the connecting rod 52.

[0054] The first mounting column 127 is provided with a mounting shaft passing through the second mounting column 742 , and the bracket 53 is sleeved on the mounting shaft.

[0055] The middle cover 12 is formed with a first torsion spring mounting column 125, a first torsion spring limiting boss 126 is formed on one side of the first torsion spring mounting column 125, and the bracket 53 protrudes backward with a second torsion spring limiting boss 531; the first elastic member 56 is a torsion spring, which is sleeved on the first torsion spring mounting column 125, one end of which is against the first torsion spring limiting boss 126, and the other end is against the second torsion spring limiting boss 531, which can provide a restoring elastic force for the bracket 53. During installation, the torsion spring can be first installed on the first torsion spring mounting column 125 of the middle cover 12, and then the bracket 53 can be installed on the middle cover 12, which makes the assembly operation more convenient.

[0056] The lock buckle 55 includes a first arm 551 corresponding to the jump buckle 54 and capable of being locked with the jump buckle 54, and a second arm 552 corresponding to the electromagnetic release 4. The second arm 552 extends to the right with an elastic arm 553, and the end of the elastic arm 553 is cylindrical or spherical. The side cover extends a limit bar, and the limit bar is correspondingly arranged above the end of the elastic arm 553 and is limited with the end of the elastic arm 553. It utilizes the limit cooperation between the elastic arm 553 and the limit bar, as well as the elastic deformation performance of the elastic arm 553 itself, to achieve automatic reset of the lock buckle 55 after being released. Compared with conventional technology, the lock buckle reset torsion spring is omitted, parts are saved, assembly is simplified, and assembly operation is more convenient.

[0057] In addition, a reset spring is provided between the electromagnetic release 4 and the bracket 53 , and the reset spring is rotatably mounted on the middle cover 12 .

[0058] When a leakage fault or leakage test occurs, the top rod of the electromagnetic release 4 will be pushed out, driving the lock 55 to unlock and release, and the bracket 53 will rotate counterclockwise under the action of the first elastic member 56, and drive the handle to move, and the handle will be linked to the circuit breaker to partially move to achieve the opening action. At this time, the elastic arm 553 of the lock 55 will contact the limit bar, thereby toggling the lock 55 to reset, and the bracket 53 will toggle the reset spring to push the top rod of the electromagnetic release 4 back to the original position. When reclosing the circuit breaker, the handle action drives the bracket 53 to rotate clockwise, and the lock 55 moves with the bracket 53, and its elastic arm 553 will separate from the limit bar, and the bracket 53 will separate from the reset spring to ensure that when a leakage fault occurs, the top rod can be pushed out smoothly to achieve tripping.

[0059] The leakage protection part also includes an arc extinguishing chamber, which is arranged below the N-pole moving contact 71. As the opening distance between the N-pole moving contact and the N-pole static contact increases, the space between the two becomes larger. Therefore, an arc extinguishing chamber can be further arranged to ensure arc extinguishing, thereby further ensuring the safety performance of the circuit breaker.

[0060] The test mechanism 6 includes a test button 61, a test torsion spring 62, a cover plate 63, and a resistor 64. The test button 61 is movably arranged on the shell, and the cover plate 63 is fixedly arranged on the front side of the arc extinguishing chamber. The cover plate 63 is provided with a torsion spring mounting groove 631 and a resistor mounting groove 632. The resistor 64 is fixedly installed in the resistor mounting groove 632, and the test torsion spring 62 is fixedly installed in the torsion spring mounting groove 631. One end of the test torsion spring 62 is connected to the resistor 64, and the other end extends to the top of the test contact boss 731 and is connected to the test button 61. When the test is in action, the test button 61 is pressed, which will drive the test torsion spring 62 to contact the test contact boss 731 of the N-pole terminal plate 73 to realize the leakage test.

[0061] Since the test torsion spring 62 is installed on the cover plate 64 on the front side of the arc extinguishing chamber, compared with the existing technology, the installation and assembly of components is very convenient, and the installation position of the test mechanism 6 is moved forward as a whole. There is enough space on the rear side of the cover plate 64 and above the arc extinguishing chamber to place the connecting conductor connecting the moving contact and the terminal, thereby reducing the obstruction of the moving contact by the connecting conductor and making its movement more flexible.

[0062] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0063] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0064] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept of the utility model is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent right.

Claims

1. A residual current circuit breaker with interchangeable L / N pole positions, comprising: A shell (1), comprising two side covers (11) and a middle cover (12), wherein the middle cover (12) separates the shell (1) into an L-pole side and an N-pole side; A circuit breaker part, which is arranged on the L-pole side of the housing (1), the circuit breaker part comprising an operating mechanism (21), a thermal tripping mechanism (22), an electromagnetic tripping mechanism (23), an arc extinguishing mechanism (24), an L-pole contact mechanism (25), and a first wiring terminal (26) and a second wiring terminal (27) arranged on both sides of the housing (1); A leakage protection part, which is arranged on the N-pole side of the housing (1), the leakage protection part comprising a leakage tripping device consisting of a zero-sequence current transformer (3), an electromagnetic tripping device (4), a leakage operating mechanism (5) and a testing mechanism (6), the leakage protection part also comprising an N-pole contact mechanism and a third wiring terminal (31) and a fourth wiring terminal (32) arranged on both sides of the housing (1); The feature is that a plurality of wiring holes connecting the L-pole side and the N-pole side are formed on the middle cover (12), including: A first wiring hole (121), which is located below the first wiring terminal (26) and the third wiring terminal (31); A second wiring hole (122), located below the second wiring terminal (27) and the fourth wiring terminal (32); A third wiring hole (123), which corresponds to the double gold sheets of the thermal release mechanism (22); A fourth wiring hole (124), which corresponds to the electromagnetic tripping mechanism (23); The N-pole side of the housing (1) is provided with: A first L-pole wire (81), one end of which passes through the third wiring hole (123) to be connected to the double gold sheet of the thermal release mechanism (22), and the other end of which passes through the first wiring hole (121) to be connected to the first wiring terminal (26) or directly connected to the third wiring terminal (31); A second L-pole conductor (82) passes through the zero-sequence current transformer (3), and one end of the conductor passes through the fourth wiring hole (124) to be connected to the coil of the electromagnetic tripping mechanism (23), and the other end passes through the second wiring hole (122) to be connected to the second wiring terminal (27) or directly connected to the fourth wiring terminal (32); A first N-pole wire (91), one end of which is connected to the N-pole movable contact of the N-pole contact mechanism (7), and the other end of which is connected to the third wiring terminal (31) or connected to the first wiring terminal (26) after passing through the first wiring hole (121); A second N-pole conductor (92) passes through the zero-sequence current transformer (3), one end of which is connected to the N-pole static contact of the N-pole contact mechanism (7), and the other end of which is connected to the fourth wiring terminal (32) or is connected to the second wiring terminal (27) after passing through the second wiring hole (122).

2. A residual current circuit breaker with interchangeable L / N pole positions according to claim 1, characterized in that: The first wiring hole (121) is communicated with the third wiring hole (123).

3. The residual current circuit breaker with interchangeable L / N pole positions according to claim 1, characterized in that: The leakage operating mechanism (5) comprises a handle (51), a connecting rod (52), a bracket (53), a jump buckle (54), a lock buckle (55), and a first elastic member (56); the bracket (53) is rotatably mounted on the middle cover (12); the jump buckle (54) and the lock buckle (55) are rotatably mounted on the bracket (53); the lock buckle (55) and the jump buckle (54) can be locked with each other; the handle (51) is rotatably mounted on the housing and connected to the jump buckle (54) via the connecting rod (52); A first torsion spring mounting column (125) is formed on the middle cover (12), a first torsion spring limiting boss (126) is formed on one side of the first torsion spring mounting column (125), and a second torsion spring limiting boss (531) protrudes backwards from the bracket (53); the first elastic member (56) is a torsion spring, which is sleeved on the first torsion spring mounting column (125), one end of which is against the first torsion spring limiting boss (126), and the other end of which is against the second torsion spring limiting boss (531), so as to provide a restoring elastic force for the bracket (53).

4. A residual current circuit breaker with interchangeable L / N pole positions according to claim 3, characterized in that: The lock buckle (55) comprises a first arm (551) corresponding to the jump buckle (54) and capable of being locked with the jump buckle (54), and a second arm (552) corresponding to the electromagnetic release (4); the second arm (552) extends to the right side to form an elastic arm (553).

5. The residual current circuit breaker with interchangeable L / N pole positions according to claim 1, characterized in that: The N-pole contact mechanism further comprises an N-pole moving contact bracket (74) and a second elastic member (75); the N-pole moving contact bracket (74) is coaxially pivoted with the N-pole moving contact (71) on the middle cover (12), and the N-pole moving contact bracket (74) is linked with the operating mechanism (21) via a hinge shaft (76); The N-pole moving contact bracket (74) is formed with a torsion spring limiting groove (741); the second elastic member (75) adopts a torsion spring and is coaxially installed with the N-pole moving contact (71); one end of the second elastic member (75) is clamped in the torsion spring limiting groove (741) and the other end is bent to abut against the side wall of the N-pole moving contact (71), thereby providing an elastic force for the N-pole moving contact (71).

6. The residual current circuit breaker with interchangeable L / N pole positions according to claim 1, characterized in that: The N-pole contact mechanism further comprises an N-pole wiring board (73), wherein the N-pole wiring board (73) is fixedly mounted in the housing (1), the first N-pole wire (91) is connected to the N-pole wiring board (73), and the N-pole wiring board (73) is connected to the N-pole moving contact (71) via a wire.

7. The residual current circuit breaker with interchangeable L / N pole positions according to claim 6, characterized in that: The N-pole terminal plate (73) extends to have a test contact boss (731); The test mechanism (6) comprises: A test button (61) movably disposed on the housing; A test torsion spring (62) is fixedly disposed in the housing, and one end of the test torsion spring extends above the test contact boss (731) and is connected to the test button (61).

8. The residual current circuit breaker with interchangeable L / N pole positions according to claim 7, characterized in that: The test mechanism (6) further comprises a cover plate (63), the cover plate (63) being provided with a torsion spring installation groove (631), and the test torsion spring (62) being installed in the torsion spring installation groove (631).

9. The residual current circuit breaker with interchangeable L / N pole positions according to claim 8, characterized in that: A resistor installation groove (632) is also formed on the cover plate (63), a resistor (64) is arranged in the resistor installation groove (632), and the resistor (64) is connected to the test torsion spring (62).

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