CN106257295B

CN106257295B - Circuit breaker

Info

Publication number: CN106257295B
Application number: CN201510347131.1A
Authority: CN
Inventors: 夏晓敏; 黄东林; 朱俊; 陈一新
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2015-06-19
Filing date: 2015-06-19
Publication date: 2023-09-12
Anticipated expiration: 2035-06-19
Also published as: CN106257295A

Abstract

The circuit breaker comprises a shell, a test button, a test loop and a switch assembly, wherein the test button is fixed on the shell. The switch assembly comprises a conductive bridge, a resistor, a first static contact and a second static contact; one end of the test loop is connected with the resistor, the other end of the resistor is connected with the first static contact, and the other end of the test loop is connected with the second static contact through a wire; the conductive bridge is arranged on the test button and used for controlling the on-off of the first static contact and the second static contact, and a reset spring is arranged between the test button and the shell. The test button device of the circuit breaker adopts a double-breakpoint structure, so that the electric gap is increased, and the requirement of an integrated product is met; the other end of the resistor connected to one end of the test loop and the wire connected to the other end of the test loop are respectively connected with the first static contact and the second static contact, so that the structure is simple, and the material cost is reduced.

Description

Circuit breaker

Technical Field

The invention relates to the field of piezoelectric devices, in particular to a circuit breaker.

Background

The existing breaker test button mechanism adopts a spring piece design, is of a single-breakpoint structure, adopts a pushing mode to realize control of the metal spring piece, has large stroke, causes incompact mechanism and low operation sensitivity, and is easy to cause pressure breakdown due to smaller stroke of the button and compact layout of the product in an integrated product.

At present, leakage current can be generated by leakage current existing in the use process of equipment and unbalanced insulation impedance of a three-phase line due to the existence of a distributed capacitance and insulation resistance to the ground in a distribution line of the circuit breaker, so that an initial leakage current exists in a zero sequence current transformer when the residual current acts on the circuit breaker. When an instantaneous larger current appears in the circuit, but is lower than the instantaneous tripping current of the product, an instantaneous larger induced voltage also appears on the secondary side of the zero sequence current transformer, the set value of the product is reached, the misoperation of the product occurs, and adverse effects such as power failure are caused. In order to prevent the malfunction of the product, a zero sequence current transformer with excellent balance characteristic needs to be selected, so that the secondary side induced voltage is insufficient to drive the electromagnetic relay when a moment of larger current appears in the circuit. However, the performance of the current domestic transformer is difficult to achieve high performance due to the limitation of the technical level, or the current domestic transformer is introduced by means of technology, and the cost is high.

At present, the circuit breaker is being towards multifunctionality, miniaturized development, and the circuit breaker that possesses overload, short circuit, earth leakage protection function simultaneously of integral type is more and more popular in market, and multipolar, multi-functional circuit breaker need the link in order to realize that can open the circuit in step when a certain electric current trouble appears or need the circuit to close to realize synchronous closing, also need the assembly and the dismantlement that the link can be convenient simultaneously. Most of the existing linkage parts are embedded, and when the linkage parts are assembled, the handle holes of the operating mechanism are embedded into the shafts of the linkage parts one by one, so that linkage is realized; when the linkage piece is damaged, the circuit breaker can be replaced only after the product is disassembled and the circuit breaker is removed pole by pole, and the operation is complex.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the circuit breaker which is simple in structure, stable and reliable in performance and low in cost.

In order to achieve the above purpose, the invention adopts the following technical scheme:

a circuit breaker comprising a housing 1, a test button 2 fixed to the housing 1, a test circuit 3B and a switch assembly; the switch assembly comprises a conductive bridge 3, a resistor 4, a first fixed contact 51 and a second fixed contact 52; one end of the test loop 3B is connected with the resistor 4, the other end of the resistor 4 is connected with the first fixed contact 51, and the other end of the test loop 3B is connected with the second fixed contact 52 through the lead 5; the conductive bridge 3 is arranged on the test button 2 and used for controlling the on-off of the first fixed contact 51 and the second fixed contact 52, and a reset spring 6 is arranged between the test button 2 and the shell 1.

Further, one end of the return spring 6 extends out of the conductive bridge 3.

Further, the first stationary contact 51 and the second stationary contact 52 are located at one side of the test button 2, one end of the return spring 6 extends out of the conductive bridge 3 toward one side of the first stationary contact 51 and the second stationary contact 52, and the conductive bridge 3 is located above the first stationary contact 51 and the second stationary contact 52 in the power-off state.

Further, the second stationary contact 52 is located between the first stationary contact 51 and the test button 2, and the first stationary contact 51 is higher than the second stationary contact 52.

Further, a first fixing block 11 is arranged on the shell 1 and used for fixing two ends of the resistor 4, and a fixing groove 111 is formed in the middle of the first fixing block 11; the casing 1 is provided with a second fixing block 12 for fixing the other end of the resistor 4, the second fixing block 12 is provided with a fixing hole 121 for allowing the other end of the resistor 4 to pass through, and after the other end of the resistor 4 passes through the fixing hole 121, the part exposed outside the fixing hole 121 forms a first stationary contact 51.

Further, a third fixing block 14 for fixing the wire 5 at the other end of the test circuit 3B is provided on the housing 1, the third fixing block 14 is provided with a fixing through hole for passing the wire 5 at one end of the test circuit 3B, and after passing through the fixing through hole, the wire 5 at one end of the test circuit 3B extends out of the fixing through hole to form a second stationary contact 52.

Further, the end portion of the test button 2 is provided with a spring fixing column 21 for fixing one end of the return spring 6 in an extending manner, the housing 1 is provided with a spring fixing block 13, and the spring fixing block 13 is provided with a containing groove 131 for containing the other end of the return spring 6.

Further, a latch arm 22 in latch fit with the housing 1 is provided on one side of the test button 2, the latch arm 22 is provided with an extension arm 23 extending downward, and a conductive bridge fixing groove 231 for fixing the conductive bridge 3 is provided at the lower end of the extension arm 23.

Further, after the other end of the resistor 4 is fixed by the first fixing block 11, the rear end of the U-shaped bent section 41 is bent and fixed by the second fixing block 12.

Further, the device also comprises a residual current detection element 1B, a tripping reset mechanism 2B and an electromagnetic relay 9B; the test loop 3B is arranged on one side of the inside of the shell and is used for detecting an internal circuit; the residual current detection element 1B is arranged at the bottom of the shell and is positioned at one side and used for detecting whether residual current exists in the circuit or not; the tripping reset mechanism 2B is arranged opposite to the electromagnetic relay 9B, and the firing pin ejection of the electromagnetic relay 9B can push the tripping reset mechanism 2B to trip; the tripping reset mechanism 2B comprises a U-shaped rod 21B, a lock catch 22B and a jump button 23B, wherein the handle is connected with the U-shaped rod 21B, the lock catch 22B and the jump button 23B form a four-bar structure, and the other end of the jump button 23B is connected with a reset rod 24B; the trip rod 25B is further included, one end of the trip rod 25B is pivotally connected to the shell, the other end of the trip rod 25B can stir the reset rod 24B to rotate, one end of the reset rod 24B is connected with a spring piece 241B, one side of the spring piece 241B is abutted against a firing pin of the electromagnetic relay 9B, the other side of the spring piece is opposite to the trip rod 25B, when the trip rod is tripped, the firing pin of the electromagnetic relay 9B ejects the spring piece 241B to push the reset rod 24B to drive the reset rod 24B to rotate, and meanwhile the spring piece 241B pushes the trip rod 25B to drive the reset rod 24B to rotate to damage the interlocking of the lock catch 22B and the trip button 23B.

The test button device of the circuit breaker adopts a double-breakpoint structure, so that the electric gap is increased, and the requirement of an integrated product is met; the other end of the resistor connected to one end of the test loop and the wire connected to the other end of the test loop are connected with the first static contact and the second static contact respectively, the structure is simple, the material cost is reduced, the conducting bridge arranged on the test button is used for controlling the on-off of the first static contact and the second static contact, the structure is simpler, the action stroke of the test button is reduced, the test button mechanism of the circuit breaker is compact in structure, the test button adopts a special reset spring, the reset is more reliable, the work is more reliable and stable, the operation is more sensitive, and the material cost is reduced. One end of the reset spring extends out of the conductive bridge, no additional conductive bridge component is needed, the structural design is ingenious, and materials are saved. The first stationary contact is higher than the second stationary contact, and when the one end of conducting bridge contacted first stationary contact, test circuit still can not switch on, and when the other end of conducting bridge contacted the second stationary contact, test circuit switched on carries out circuit detection, and structural design is reasonable, and the work is more reliable stable.

Drawings

FIG. 1 is a schematic diagram of an over-current protection pole according to the present invention;

FIG. 2 is a schematic diagram of the structure of a residual current trip electrode of the present invention;

FIG. 3 is a schematic illustration of a residual current trip electrode with a test button mechanism of the present invention;

FIG. 4 is a schematic view of the structure of the test button of the present invention;

FIG. 5 is a schematic diagram of the electromagnetic system of the present invention;

fig. 6 is a schematic diagram of the structure of the wire winding on the zero sequence transformer according to the present invention;

fig. 7 is a schematic view of a structure of the circuit breaker of the present invention mounted with a linkage;

fig. 8 is a schematic view of an exploded construction of the circuit breaker and the linkage of the present invention;

FIG. 9 is a schematic structural view of the linkage of the present invention;

fig. 10 is a schematic view of the structure of one side of the handle of the circuit breaker of the present invention;

fig. 11 is a schematic view of the structure of the other side of the breaker handle of the present invention;

fig. 12 is a schematic view showing the structure of one side of the other handle of the circuit breaker of the present invention;

fig. 13 is a schematic view of another side of another handle of the circuit breaker of the present invention.

Detailed Description

Embodiments of the circuit breaker of the present invention are further described below with reference to the examples shown in fig. 1 to 13. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-2, the circuit breaker of the invention comprises an integral structure composed of two overcurrent protection poles and a residual current tripping pole, wherein the two overcurrent protection poles are symmetrically distributed on two sides of the residual current tripping pole, and each stage can be separated by a baffle plate. The two overcurrent protection poles are symmetrically arranged, so that the overcurrent protection poles on the two sides have the same electrical loop length, and compared with the arrangement of the residual current tripping pole on one side of the circuit breaker, the circuit breaker is more beneficial to product temperature rise and time delay action.

As shown in fig. 8, the overcurrent protection pole structure of the circuit breaker of the invention is shown. Each overcurrent protection pole comprises an operating mechanism 1A connected with a handle, an instantaneous release 2A, a delay release 4A, a contact system 3A and a shell of the overcurrent protection pole, wherein the contact system 3A comprises a fixed contact 5A and a moving contact 6A, one end of the moving contact 6A is connected with the operating mechanism 1A, the fixed contact 5A is fixed in the shell of the overcurrent protection pole, the contact of the fixed contact 5A is opposite to the contact of the moving contact 6A, the instantaneous release 2A is positioned above an arc extinguishing device 7A, and the operating mechanism 1A is driven to trip when a circuit is short-circuited; the delay release 4A is positioned at the bottom of the shell and at one side of the arc extinguishing device 7A, and drives the operating mechanism 1A to release when a circuit is overloaded; the internal structures of the two overcurrent protection poles are symmetrically arranged and have the same electric loop length. The overcurrent protection pole of the circuit breaker has simple and compact structure and high space utilization rate.

As shown in fig. 2-4, the residual current release pole structure of the circuit breaker of the invention is shown. The residual current tripping electrode further comprises a residual current detection element 1B, a tripping reset mechanism 2B connected with the auxiliary handle 9B, a test loop 3B, an electromagnetic relay 9B and a shell of the residual current tripping electrode, wherein the test loop 3B is arranged on one side of the inside of the shell of the residual current tripping electrode and used for detecting an internal circuit, the electromagnetic relay 9B is arranged on one side of the bottom of the shell of the residual current tripping electrode, the residual current detection element 1B is arranged on one side of the electromagnetic relay 9B and used for detecting whether residual current exists in the circuit, the tripping reset mechanism 2B is arranged opposite to the electromagnetic relay 9B, and the firing pin of the electromagnetic relay 9B can push the tripping reset mechanism 2B to trip. The residual current tripping electrode of the circuit breaker has a simple and compact structure and reasonable internal element layout.

As shown in fig. 2-4, the trip reset mechanism 2B includes a U-shaped rod 21B, a lock catch 22B, and a trip button 23B, wherein the handle is connected with the U-shaped rod 21B, the lock catch 22B and the trip button 23B to form a four-bar structure, and the other end of the trip button 23B is connected with a reset lever 24B; the trip rod 25b is further included, one end of the trip rod 25b is pivotally connected to the shell, the other end of the trip rod 25b can stir the reset rod 24b to rotate, one end of the reset rod 24b is connected with a spring piece 241b, one side of the spring piece 241b is abutted against a firing pin of the electromagnetic relay 9, the other side of the spring piece is opposite to the trip rod 25b, during trip, the firing pin of the magnetic relay 9 ejects out of the push spring piece 241b to drive the reset rod 24b to rotate, and meanwhile, the spring piece 241b pushes the trip rod 25b to drive the reset rod 24b to rotate to damage the linkage of the lock catch 22b and the jump button 23 b. According to the tripping resetting mechanism, during tripping, on one hand, the spring piece 241b can drive the resetting rod 24b to rotate for tripping, meanwhile, the spring piece 241b pushes the tripping rod 25b to drive the resetting rod 24b to rotate so as to break the linkage of the lock catch 22b and the tripping button 23b for tripping, and double tripping speeds up tripping time and improves product performance; at the time of reset, the striker of the magnetic relay 9 is struck by the spring piece 241b to reset.

As shown in fig. 3 to 4, the circuit breaker of the present invention includes a housing 1, a test button 2 fixed to the housing 1, a test circuit 3B, and a switch assembly; the switch assembly comprises a conductive bridge 3, a resistor 4, a first fixed contact 51 and a second fixed contact 52; one end of the test loop 3B is connected with the resistor 4, the other end of the resistor 4 is connected with the first fixed contact 51, and the other end of the test loop 3B is connected with the second fixed contact 52 through the lead 5; the conductive bridge 3 is arranged on the test button 2 and used for controlling the on-off of the first fixed contact 51 and the second fixed contact 52, and a reset spring 6 is arranged between the test button 2 and the shell 1. The test button device of the circuit breaker adopts a double-breakpoint structure, so that the electric gap is increased, and the requirement of an integrated product is met; the other end of the resistor connected to one end of the test loop and the wire connected to the other end of the test loop are connected with the first static contact and the second static contact respectively, the structure is simple, the material cost is reduced, the conducting bridge arranged on the test button is used for controlling the on-off of the first static contact and the second static contact, the structure is simpler, the action stroke of the test button is reduced, the test button mechanism of the circuit breaker is compact in structure, the test button adopts a special reset spring, the reset is more reliable, the work is more reliable and stable, the operation is more sensitive, and the material cost is reduced. Obviously, the double-break structure of the test button device of the invention can be also applied to other circuit breakers, including miniature circuit breakers, molded case circuit breakers and the like.

As shown in fig. 3, the first stationary contact 51 and the second stationary contact 52 are located at one side of the test button 2, one end of the return spring 6 extends out of the conductive bridge 3 toward the first stationary contact 51 and the second stationary contact 52, and the conductive bridge 3 is located above the first stationary contact 51 and the second stationary contact 52 in the power-off state. The test button 2 is arranged on one side of the first fixed contact 51 and the second fixed contact 52, and the test button 2 avoids the first fixed contact 51 and the second fixed contact 52 when in action, so that the structure is reasonable. One end of the reset spring 6 extends out to form the conductive bridge 3, no additional conductive bridge component is needed, the structural design is ingenious, and materials are saved. The second stationary contact 52 is located between the first stationary contact 51 and the test button 2, the first stationary contact 51 is higher than the second stationary contact 52, when one end of the conductive bridge 3 contacts the first stationary contact 51, the test circuit can not be switched on, until the other end of the conductive bridge 3 contacts the second stationary contact 52, the test circuit is switched on, circuit detection is performed, the structural design is reasonable, and the operation is more reliable and stable. The test button 2 is positioned at one side of the first and second stationary contacts, and the conductive bridge 3 extends out of the upper end of the return spring 6 and extends to the upper parts of the first and second stationary contacts 51 and 52; the test button 2 may be disposed between the first stationary contact 51 and the second stationary contact 52, and the upper end of the return spring 6 extends out of the conductive bridge 3 to both sides, and the conductive bridge 3 on both sides is located above the first stationary contact 51 and the second stationary contact 52, respectively.

As shown in fig. 3, the casing 1 is provided with a first fixing block 11 for fixing two ends of the resistor 4, and a fixing groove 111 is formed in the middle of the first fixing block 11; the casing 1 is provided with a second fixing block 12 for fixing the other end of the resistor 4, the second fixing block 12 is provided with a fixing hole 121 for allowing the other end of the resistor 4 to pass through, and after the other end of the resistor 4 passes through the fixing hole 121, the part exposed outside the fixing hole 121 forms a first stationary contact 51. The two ends of the resistor 4 are respectively provided with a first fixed block 11 on the shell 1, and the two ends of the resistor 4 are respectively fixed in the fixed grooves 111 of the first fixed block 11, so that the structure is stable; the resistor is also provided with a second fixed block 12, and after the end part of the other end of the resistor 4 passes through the fixed hole 121 of the second fixed block 12, the part exposed outside the fixed hole 121 forms a first fixed contact 51, so that the existing structure is reasonably utilized, an additional contact structure is not required to be arranged, the structure is compact, and materials are saved. After the other end of the resistor 4 is fixed by the first fixing block 11, the end of the U-shaped bending section 41 is fixed by the second fixing block 12 after the U-shaped bending section is formed by bending, and the structure of the resistor 4 is more stable due to the design.

As shown in fig. 3, the housing 1 is provided with a third fixing block 14 for fixing the wire 5 at the other end of the test circuit 3B, the third fixing block 14 is provided with a fixing through hole for passing the wire 5 at one end of the test circuit 3B, and the part of the wire 5 at one end of the test circuit 3B extending out of the fixing through hole forms a second stationary contact 52 after passing through the fixing through hole. The other end wire 5 of the test loop 3B is fixed by the third fixed block 14 arranged on the shell 1, a fixed through hole is formed in the third fixed block 14, after the wire 5 passes through the fixed through hole, the part extending out of the fixed through hole forms a second fixed contact 52, the existing structure is reasonably utilized, no additional contact structure is required, the structure is compact, and materials are saved.

The contact structure of the circuit breaker is correspondingly arranged by the existing structure, no additional contact structure is added, the structure is simple, and the material utilization rate is high. Other fixing modes can be adopted for the fixing structure.

As shown in fig. 3-4, the end of the test button 2 is extended with a spring fixing column 21 for fixing one end of the return spring 6, the housing 1 is provided with a spring fixing block 13, and the spring fixing block 13 is provided with a receiving groove 131 for receiving the other end of the return spring 6. One end of the test button 2 is provided with a spring fixing column 21, one end of the return spring 6 is fixed by the spring fixing column 21, the shell 1 is provided with a spring fixing block 13, the spring fixing block 13 is provided with an accommodating groove 131, and the other end of the return spring 6 is arranged in the accommodating groove 131 to be fixed. One side of the test button 2 is provided with a clamping arm 22 in clamping fit with the shell 1, the clamping arm 22 is provided with an extension arm 23 in a downward extending mode, and the lower end of the extension arm 23 is provided with a conductive bridge fixing groove 231 for fixing the conductive bridge 3. One end of the conductive bridge 3 is fixed by the fixing groove of the extension arm 23, and the structure is stable and reliable.

As shown in fig. 3, after the other end wire 5 of the test circuit 3B is led out from the other end of the test circuit 3B, it extends upward, the extension is fixed by a rectangular fourth fixing block 15 provided on the housing 1, it extends to the bottom of the accommodating groove 131 to be bent, the bent portion is fixed by an arc-shaped fifth fixing block 16, then it is bent upward again, the end is fixed by the third fixing block 14, and the upward bent portion is fixed by one side of the accommodating groove 131. The structure is more stable and reliable for fixing the lead at the other end of the test loop 3B.

During installation, the reset spring 6 is sleeved on the spring fixing column 21 at one end of the test button 2, the other end of the reset spring 6 is arranged in the accommodating groove 131, the reset spring 6 drives the test button 2 to move upwards by means of self elastic force, the clamping arm 22 at one side of the test button 2 and the shell are clamped to limit the test button 2 to move upwards, the conductive bridge 3 at one end of the reset spring extends to the upper parts of the first fixed contact 51 and the second fixed contact 52 at one side, and the test button 2 is installed.

As shown in fig. 5-6, the circuit breaker of the present invention comprises a zero sequence transformer 7 and a zero line 5a and a live line 5b passing through the zero sequence transformer 7; the zero line 5a and the live line 5b pass through one end of the zero sequence transformer 7 respectively, then pass through the other end of the zero sequence transformer 7 after being wound on the zero sequence transformer 7, and the zero line 5a and the live line 5b are symmetrically and alternately wound on the zero sequence transformer 7. The invention adopts a cross symmetrical winding mode to wind the lead wire of the circuit breaker on the zero sequence transformer, solves the problem that instant larger current appears in the residual current action circuit breaker, but simultaneously is lower than the problem that the instant tripping current of a product appears misoperation when the secondary side induced current of the zero sequence transformer reaches a set value, can solve the problem without selecting the zero sequence current transformer with excellent balance characteristic and higher cost, reduces the cost and improves the reliability of the product. Obviously, the winding mode of the cross symmetry of the conducting wire of the circuit breaker on the zero sequence transformer can be also applied to other circuit breakers.

As shown in fig. 5-6, the null line 5a includes a first null line segment 51a and a second null line segment 52a, the live line 5b includes a first live line segment 51b and a second live line segment 52b, the first null line segment 51a, the first live line segment 51b, the second null line segment 52a and the second live line segment 52b are sequentially and uniformly distributed at one end of the zero sequence transformer 7, the first null line segment 51a and the second null line segment 52a are oppositely arranged, and the first live line segment 51b and the second live line segment 52b are oppositely arranged. The zero line 5a and the live line 5b are wound on the zero sequence transformer in a crossed symmetrical winding mode, so that the induction output current of the secondary side of the zero sequence transformer is balanced to the maximum extent, and the product performance is improved. Of course, the zero line 5a and the live line 5b can also be wound on the zero sequence transformer 7 in a winding mode of crossed symmetry for a plurality of circles.

As shown in fig. 5-6, in a specific winding manner of the zero line 5a and the live line 5b, the first zero line segment 51a is pressed above the first live line segment 51b, after the zero line 5a passes through one end of the zero sequence transformer 7, the zero line 5a passes through one end of the zero sequence transformer 7 after being wound around the side wall of the zero sequence transformer 7, the second zero line segment 52a is pressed below the first live line segment 51b, and the zero line 5a passes through the other end of the zero sequence transformer 7; the first fire wire segment 51b is pressed below the first zero wire segment 51a, after the fire wire 5b passes through one end of the zero sequence transformer 7, the fire wire 5b passes through one end of the zero sequence transformer 7 after the side wall of the zero sequence transformer 7 is wound, the second fire wire segment 52b is pressed below the second zero wire segment 52a, and the fire wire 5b passes out from the other end of the zero sequence transformer 7.

As shown in fig. 5-6, the side wall of the zero sequence transformer 7 forms a magnetic ring circumferential surface 71, and two winding plates 711 which are convenient for winding the zero line 5a and the live line 5b are arranged on the outer side wall of the magnetic ring circumferential surface 71 of the zero sequence transformer 7. Two winding plates 711 are arranged on the outer side wall of the magnetic ring circumferential surface 71 of the zero-sequence transformer 7, so that the zero line 5a and the live line 5b are conveniently fixed on the zero-sequence transformer 7. The two winding plates 711 are perpendicular to the circumferential surface 71 of the magnetic ring, and an included angle formed between the two winding plates 711 is 30-45 degrees. The included angle formed between the two winding plates 711 is controlled to be 30-45 degrees, so that the cross symmetrical winding of the wire is convenient to realize.

As shown in fig. 5, the device further comprises two wiring lugs 1a, two tripping coils 2a and an arc striking angle 3a; one end of each of the two tripping coils 2a is connected with one end of a zero line 5a and one end of a fire line 5b respectively, the other end of each of the two tripping coils is connected with one arc striking angle 3a, the other ends of the zero line 5a and the fire line 5b respectively penetrate through a zero sequence transformer 7 positioned at a residual current tripping electrode and then are connected with one wiring lug 1a respectively, and the two wiring lugs 1a, the two tripping coils 2a and the two arc striking angles 3a are symmetrically arranged on two sides of the zero sequence transformer 7 respectively. The wiring piece 1a, the tripping coil 2a and the arc striking angle 3a form an electromagnetic system of the circuit breaker, the wiring piece 1a, the tripping coil 2a and the arc striking angle 3a are respectively and symmetrically arranged on two sides of the zero sequence transformer 7, so that balance output of the transformer can be realized, and the misoperation risk of a product is reduced. The tripping coil 2a and the arc striking angle 3a are respectively and symmetrically distributed in the overcurrent protection poles at two sides of the residual current tripping pole.

As shown in fig. 5, each arc striking angle 3a is arc-shaped, one end of each arc striking angle 3a is connected with the other end of one trip coil 2a, one end of each arc striking angle 3a is provided with a first connecting sheet 31a, one side of the first connecting sheet 31a is tightly attached to the trip coil 2a, the arc striking angle 3a is provided with a fixed contact towards the outer side to form a fixed contact 5A, and the other end of each arc striking angle 3a is connected with a second connecting sheet 32a.

As shown in fig. 7-11, the circuit breaker of the invention further comprises a linkage piece 10, wherein the linkage piece 10 is in buckling connection with the handle 9a and the auxiliary handle 9b, the linkage piece 10 and the linkage piece 10 can drive the handles 9a of the two overcurrent protection poles to be linked, the linkage piece 10 can also drive the auxiliary handle 9b of the residual current tripping pole and the handles 9a of the two overcurrent protection poles to be simultaneously switched on, and when residual current faults exist in a circuit, the auxiliary handle 9b of the residual current tripping pole can also push the linkage piece 10 to drive the handles 9a of the two overcurrent protection poles to be simultaneously switched off. The circuit breaker comprises two overcurrent protection poles and a residual current tripping pole, wherein the two overcurrent protection poles are symmetrically distributed on two sides of the residual current tripping pole; the linkage piece can drive handles of the two overcurrent protection poles to be linked, the linkage piece can also drive an auxiliary handle of the residual current tripping pole and the handles of the two overcurrent protection poles to be switched on simultaneously, and when residual current faults exist in a circuit, the auxiliary handle of the residual current tripping pole can also push the linkage piece to drive the handles of the two overcurrent protection poles to be switched on simultaneously. It is apparent that the structure of the circuit breaker of the present invention is also applicable to other circuit breakers.

The linkage member 10 can be also connected with the handle 9a of the multipole circuit breaker in a clamping way, so as to realize linkage operation of the handle 9a of the multipole circuit breaker. The linkage piece 10 can also be used as a multipolar overcurrent protection pole to realize linkage function, the multipolar overcurrent protection pole is evenly distributed to two sides of the residual current tripping pole, the linkage piece can also drive an auxiliary handle of the residual current tripping pole and handles of the overcurrent protection poles at two sides to be simultaneously switched on, and when residual current faults exist in a circuit, the auxiliary handle of the residual current tripping pole can also push the linkage piece to drive the handles of the overcurrent protection poles at two sides to be simultaneously switched on.

As shown in fig. 7 to 9, the linkage 10 is provided with a snap boss 101 connected with the handles 9a of the two overcurrent protection poles, and the handles 9a of the two overcurrent protection poles are respectively provided with a snap groove 901a matched with the snap boss 101 of the linkage 10; an auxiliary poking rod 901b is arranged at one end of the auxiliary handle 9b of the residual current tripping electrode, and the linkage piece 10 is provided with an accommodating groove 102 matched with the auxiliary poking rod 901 b. The clamping boss 101 of the linkage piece 10 is matched with the clamping grooves 901a on the handles 9a of the two overcurrent protection poles, so that the clamping connection of the linkage piece 10 and the handles 9a is realized, and the assembly and the disassembly of the linkage piece 10 are convenient, and the maintenance is convenient; the linkage piece 10 is provided with an accommodating groove 102 matched with an auxiliary poking rod 901b of an auxiliary handle 9b of a residual current tripping electrode, so that the linkage piece can drive the auxiliary handle of the residual current tripping electrode and the handles of the two overcurrent protection electrodes to be switched on simultaneously, and when residual current faults exist in a circuit, the auxiliary handle of the residual current tripping electrode can also push the linkage piece to drive the handles of the two overcurrent protection electrodes to be switched on simultaneously. The snap-fit arrangement of the snap-fit boss 101 of the linkage 10 and the snap-fit groove 901a on the handle 9a may also be interchanged.

Specifically, the auxiliary poking rod 901b is in clearance connection with the accommodating groove 102 of the linkage member 10, one side of the accommodating groove 102 is open, one side of the opening faces the auxiliary poking rod 901b of the auxiliary handle 9b, the auxiliary poking rod 901b can be driven to be switched on together when the linkage member 10 is switched on, and the auxiliary poking rod 901b is not driven to be switched off when the linkage member 10 is switched off.

As shown in fig. 7-13, the buckling grooves 901a of the handles 9a of the two overcurrent protection poles are open at one side, and the buckling grooves 901a of the handles 9a of the two overcurrent protection poles are arranged oppositely. The buckling grooves 901a of the handles 9a of the two overcurrent protection poles are open at one side, and the openings of the buckling grooves 901a are oppositely arranged so as to be convenient for buckling connection with the linkage piece 10.

As shown in fig. 9, the linkage member 10 is a U-shaped plate, one end of the U-shaped opening of the linkage rod 10 forms a U-shaped groove 10a, a separation lug 10b is arranged in the middle of the U-shaped groove 10a, and the separation lug 10b divides the U-shaped groove 10a into two cavities respectively matched with the handles 9a of the two overcurrent protection poles; the buckling bosses 101 connected with the handles 9a of the two overcurrent protection poles are respectively arranged on the side walls of the two cavities, and the accommodating grooves 102 matched with the auxiliary poking rod 901b are arranged on the separation convex blocks 10b in the middle. The specific construction of the linkage 10. The structure of the linkage member 10 adopts symmetrical arrangement, so that the universality of the linkage member 10 is improved.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims

1. The utility model provides a circuit breaker, includes casing (1), fixes test button (2) on casing (1), test return circuit (3B) and switch module, its characterized in that: the switch assembly comprises a conductive bridge (3), a resistor (4), a first static contact (51) and a second static contact (52); one end of the test loop (3B) is connected with the resistor (4), the other end of the resistor (4) is connected with the first stationary contact (51), and the other end wire (5) of the test loop (3B) is connected with the second stationary contact (52); the conducting bridge (3) is arranged on the test button (2) and used for controlling the on-off of the first static contact (51) and the second static contact (52), the conducting bridge (3) is positioned above the first static contact (51) and the second static contact (52) in a power-off state, the first static contact (51) is higher than the second static contact (52), and a reset spring (6) is arranged between the test button (2) and the shell (1).

2. The circuit breaker according to claim 1, characterized in that: one end of the return spring (6) extends out of the conductive bridge (3).

3. A circuit breaker according to claim 1 or 2, characterized in that: the first stationary contact (51) and the second stationary contact (52) are positioned on one side of the test button (2), and one end of the return spring (6) extends out of the conductive bridge (3) towards one side of the first stationary contact (51) and one side of the second stationary contact (52).

4. A circuit breaker according to claim 3, characterized in that: the second stationary contact (52) is located between the first stationary contact (51) and the test button (2).

5. The circuit breaker according to claim 1, characterized in that: the shell (1) is provided with first fixing blocks (11) at two ends of the fixed resistor (4), and a fixing groove (111) is formed in the middle of each first fixing block (11); the shell (1) is provided with a second fixed block (12) for fixing the other end of the resistor (4), the second fixed block (12) is provided with a fixed hole (121) for allowing the other end of the resistor (4) to pass through, and after the other end of the resistor (4) passes through the fixed hole (121), a part exposed out of the fixed hole (121) forms a first stationary contact (51).

6. The circuit breaker according to claim 1, characterized in that: the shell (1) is provided with a third fixed block (14) for fixing the other end lead (5) of the test loop (3B), the third fixed block (14) is provided with a fixed through hole for allowing the one end lead (5) of the test loop (3B) to pass through, and after the one end lead (5) of the test loop (3B) passes through the fixed through hole, a part extending out of the fixed through hole forms a second fixed contact (52).

7. The circuit breaker according to claim 1, characterized in that: the end extension of test button (2) is equipped with spring fixed column (21) of fixed reset spring (6) one end, casing (1) are equipped with spring fixed block (13), and spring fixed block (13) are equipped with accommodation groove (131) that hold reset spring (6) other end.

8. The circuit breaker according to claim 2, characterized in that: one side of the test button (2) is provided with a buckling arm (22) which is in buckling fit with the shell (1), the buckling arm (22) downwards extends to be provided with an extension arm (23), and the lower end of the extension arm (23) is provided with a conductive bridge fixing groove (231) for fixing the conductive bridge (3).

9. The circuit breaker of claim 5, wherein: the other end of the resistor (4) is fixed by a first fixed block (11), and then the rear end part of the U-shaped bending section (41) formed by bending is fixed by a second fixed block (12).

10. The circuit breaker according to claim 1, characterized in that: the device also comprises a residual current detection element (1B), a tripping reset mechanism (2B) and an electromagnetic relay (9B); the test loop (3B) is arranged on one side of the inside of the shell and is used for detecting an internal circuit; the residual current detection element (1B) is arranged at the bottom of the shell and is positioned at one side and used for detecting whether residual current exists in the circuit or not; the tripping reset mechanism (2B) is arranged opposite to the electromagnetic relay (9B), and the firing pin of the electromagnetic relay (9B) can push the tripping reset mechanism (2B) to trip; the tripping reset mechanism (2B) comprises a U-shaped rod (21B), a lock catch (22B), a jump button (23B) and a handle, wherein the handle is connected with the U-shaped rod (21B), the lock catch (22B) and the jump button (23B) form a four-bar structure, and the other end of the jump button (23B) is connected with a reset rod (24B); the trip rod (25B) is further included, one end of the trip rod (25B) is pivotally connected to the shell, the other end of the trip rod is capable of poking the reset rod (24B) to rotate, one end of the reset rod (24B) is connected with a spring piece (241B), one side of the spring piece (241B) is propped against a firing pin of the electromagnetic relay (9B), the other side of the spring piece is opposite to the trip rod (25B), during tripping, the firing pin of the electromagnetic relay (9B) is ejected out to push the spring piece (241B) to drive the reset rod (24B) to rotate, and meanwhile the spring piece (241B) pushes the trip rod (25B) to drive the reset rod (24B) to rotate to damage the lock catch (22B) and the chain of the jump buckle (23B).