CN209981152U - Residual current operated circuit breaker - Google Patents

Abstract

A residual current operated circuit breaker comprises a zero sequence current transformer, a leakage operation mechanism and a leakage test mechanism, wherein the leakage test mechanism comprises an elastic piece test button, a contact piece, a test resistor, a first conductive piece and a second conductive piece which are respectively connected to a test loop, the contact piece comprises a first contact arm matched with the test button and a second contact arm matched with the leakage operation mechanism, and the test button can drive the first contact arm to be contacted with the first conductive piece; an elastic part is arranged between the second contact arm and the second conductive part, the electric leakage operating mechanism can push the second contact arm to be connected with the second conductive part through the elastic part to form a channel, and test signals are generated when the test circuit forms the channels between the first contact arm and the first conductive part and between the second contact arm and the second conductive part, so that the reliability is improved through the test circuit with double breakpoints, and the tripping force F1 of the electric leakage operating mechanism is prevented from being influenced through the buffer of the elastic part.

Description

Residual current operated circuit breaker

Technical Field

The utility model relates to a low voltage apparatus field especially relates to a residual current operated circuit breaker.

Background

The residual current operated circuit breaker is an important component of the electrical appliance industry, and when an electrical circuit works normally, the residual current operated circuit breaker can achieve the functions of power failure, power supply, circuit conversion and the like by closing and opening the circuit; when electric circuit broke down, residual current operated circuit breaker can be automatic again with the circuit disconnection, avoids endangering staff's safety and the normal operating of equipment because circuit failure, can't break off electric circuit when avoiding residual current operated circuit breaker functional failure, generally needs residual current operated circuit breaker to have accredited testing organization, is convenient for investigate residual current operated circuit breaker's trouble.

The test mechanism's test circuit adopts single breakpoint structure usually, but when residual current operated circuit breaker separating brake, if press test mechanism's test button, residual current operated circuit breaker's leading-out terminal can turn on and appear to the ground voltage because of test circuit, lead to the risk of electrocuteeing in the use, also satisfy specific region's safety regulation yet, there is certain limitation, consequently, partial residual current operated circuit breaker changes test mechanism's test circuit into double break point structure, a breakpoint in the double break point passes through handle control, press test button when the handle is closed a floodgate and just can switch on test circuit.

However, the residual current operated circuit breaker is usually small in size, and the internal structure is very compact, so that the problems of small part size, high requirement on dimensional accuracy, high assembly difficulty, low assembly efficiency and poor reliability are caused, and a testing mechanism easily interferes with other mechanisms in the residual current operated circuit breaker to influence the stability of the residual current operated circuit breaker.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a simple structure has the residual current operated circuit breaker of the double break point test circuit of buffering characteristic.

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

a residual current operated circuit breaker comprises a zero sequence current transformer, a leakage operation mechanism and a leakage test mechanism, wherein the leakage test mechanism comprises an elastic piece test button, a contact piece, a test resistor, a first conductive piece and a second conductive piece which are respectively connected to a test loop, the contact piece comprises a first contact arm matched with the test button and a second contact arm matched with the leakage operation mechanism, and the test button can drive the first contact arm to be contacted with the first conductive piece; an elastic part is arranged between the second contact arm and the second conductive part, the electric leakage operating mechanism can push the second contact arm to be connected with the second conductive part through the elastic part to form a path, and the test loop generates test signals when the paths are formed between the first contact arm and the first conductive part and between the second contact arm and the second conductive part.

Preferably, one end of the elastic member is connected to one of the second contact arm and the second conductive member, and the other end of the elastic member is disposed opposite to the other of the second contact arm and the second conductive member.

Preferably, one end of the elastic member is bent to extend between the second contact arm and the second conductive member.

Preferably, the contact member is a torsion spring, the contact member includes a spiral portion connected to the housing, and the first contact arm and the second contact arm are connected to both ends of the spiral portion, respectively.

Preferably, one end of the elastic member is connected with the second contact arm, the other end of the elastic member extends to one side of the second conductive member, the leakage operating mechanism pushes the second contact arm, and the second contact arm drives the elastic member to contact with the second conductive member; the elastic piece comprises a first bending part and a first contact part which are connected, the first contact part and the second contact arm are arranged in parallel, and the first bending part is connected between the first contact part and the second contact arm to form a U-shaped structure.

Preferably, one end of the elastic member is connected with the second conductive member, the other end of the elastic member extends to one side of the second contact arm, and the leakage operating mechanism pushes the second contact arm to be in contact with the elastic member; the elastic piece comprises a second bending part and a second contact part which are connected, the second contact part is arranged in parallel with the second conductive piece, and the second bending part is connected between the second contact part and the second conductive piece to form a U-shaped structure.

Preferably, the second contact arm includes the first torque arm that becomes the U type and connect, second torque arm and third torque arm, first torque arm sets up with the third torque arm relatively, the second torque arm is connected perpendicularly between the one end of first torque arm and third torque arm, the other end and the spiral portion of first torque arm are connected, be equipped with on the casing with the spacing complex spring shaft of spiral portion, and with first torque arm, the spacing complex spring groove of second torque arm and third torque arm, the other end of third torque arm stretches out the spring groove and is connected with the one end of fourth torque arm, the other end and the elastic component of fourth torque arm are connected, the elastic component is including the first portion of bending and the first contact site that link to each other, first contact site and fourth torque arm parallel arrangement, first portion of bending is connected and is constituteed the U-shaped structure between first contact site and fourth torque arm.

Preferably, one end of the test resistor is connected with the wiring terminal through a resistor lead, the other end of the test resistor is connected with the second conductive piece, the shell comprises an upper fixing plate and a lower fixing plate which are oppositely arranged, the test resistor is arranged between the upper fixing plate and the lower fixing plate, the upper fixing plate and the second contact arm are oppositely arranged, and the upper fixing plate and the lower fixing plate are respectively in limit fit with the second conductive piece and the resistor lead; the second conductive part is sleeved on the upper fixing plate in a U shape and comprises a first conductive part and a third conductive part which are arranged oppositely, and the second conductive part is connected between the first conductive part and the third conductive part, the first conductive part is connected with one end of the test resistor, the first conductive part is in limit fit with one side, close to the test resistor, of the upper fixing plate, and the third conductive part is in limit fit with one side, close to the second contact arm, of the upper fixing plate.

Preferably, the first conductive member includes a lead contact portion engaged with the first contact arm, and a lead connection portion connected to a lead passing through a main loop of the zero sequence current transformer, the housing includes a fixing plate disposed opposite to the first contact arm, the lead contact portion is sleeved on the fixing plate in a U-shape, the lead contact portion includes a first lead, a third lead and a second lead connected between the first lead and the third lead, the first lead is in limit fit with one side of the fixing plate near the first contact arm, the first lead is disposed perpendicular to the first contact arm, the third lead is connected to one end of the lead connection portion, the third lead is in limit fit with one side of the fixing plate near the zero sequence current transformer, the lead connection portion includes a fourth lead connected to the third lead and a sixth lead connected to a lead passing through a main loop of the zero sequence current transformer, and a fifth lead connected between the fourth lead and the sixth lead, the fifth lead and the third lead being arranged in parallel.

Preferably, the leakage operating mechanism comprises a protection lever which is pivotally mounted in the casing, and a protection jump buckle and a protection lock catch which are respectively pivotally mounted on the protection lever and are mutually matched with each other in a hasp manner, the protection jump buckle is hinged with one end of the protection connecting rod, the other end of the protection connecting rod is hinged with the handle, one end of the protection lock catch is arranged corresponding to the leakage release, the second contact arm is arranged between the protection lever and the second conductive piece, and a pushing boss protruding from the second contact arm is arranged on the side edge of the protection lever.

The utility model discloses a residual current operated circuit breaker, not only the cooperation between the first contact arm and the first electrically conductive piece through the contact piece, and the cooperation between the second contact arm and the electrically conductive piece of second of contact piece, constitute the test circuit who has two breakpoints, improve residual current operated circuit breaker's reliability, and be equipped with the elastic component between second contact arm and the electrically conductive piece of second, second contact arm and the electrically conductive piece of second pass through the elastic component and form the route, buffer characteristic has, can avoid the reaction force F2 that second contact arm and the electrically conductive piece direct contact of second arouse too big, the tripping force F1 that leads to electric leakage operating device receives the influence. In addition, the device has the characteristics of simple structure, small number of parts and high reliability.

In addition, the elastic element can prevent the second contact arm from directly contacting the second conductive element, and prevent the tripping force F1 of the leakage operating mechanism from being affected due to overlarge reaction force F2 caused by the direct contact, and the elastic element can more firmly abut against the second contact arm or the side wall of the second conductive element under the elastic action of the elastic element, so that the accidental disconnection of the test circuit caused by vibration and other reasons is avoided.

Drawings

Fig. 1 is a schematic structural diagram of a residual current operated circuit breaker according to an embodiment of the present invention;

fig. 2 is a partial enlarged view of fig. 1 according to the embodiment of the present invention;

fig. 3 is a plan view of a residual current operated circuit breaker according to an embodiment of the present invention;

fig. 4 is a plan view of a housing of a residual current operated circuit breaker according to an embodiment of the present invention;

fig. 5 shows a first embodiment of a second conductive member according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a contact member according to an embodiment of the present invention;

fig. 7 shows a second embodiment of a second conductive member according to an embodiment of the present invention;

fig. 8 is a third embodiment of the second conductive member according to the embodiment of the present invention.

Detailed Description

The following description will further describe a specific embodiment of the residual current operated circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 8. The present invention is not limited to the description of the following embodiments.

As shown in fig. 1-3, the utility model discloses a residual current operated circuit breaker, including the casing and set up residual current operated circuit breaker looks utmost point 1 and earth leakage protection utmost point 2 in the casing side by side, the circuit breaker looks utmost point 1 and earth leakage protection utmost point 2 can set up side by side in same casing, for example separate through the baffle, also can be two solitary casings, through the link gear grafting complex of side setting side by side.

The leakage protection pole 2 comprises a zero sequence current transformer 21, a leakage operation mechanism 22, a leakage tripping mechanism 23 and a leakage test mechanism which are arranged in a shell, and a main loop of the phase pole 1 of the circuit breaker penetrates through the zero sequence current transformer 21;

the electric leakage testing mechanism comprises a testing button 30, a contact element, a testing resistor 33, a first conductive element 31 and a second conductive element 32 which are respectively connected into the testing loop, the contact element comprises a first contact arm 41 matched with the testing button 30 and a second contact arm 42 matched with the electric leakage operating mechanism 22, and the testing button 30 can drive the first contact arm 41 to be in contact with the first conductive element 31;

an elastic member 5 is arranged between the second contact arm 42 and the second conductive member 32, the leakage operating mechanism 22 can push the second contact arm 42 to be connected with the second conductive member 32 through the elastic member 5 to form a path, and the test circuit generates a test signal when the path is formed between the first contact arm 41 and the first conductive member 31 and between the second contact arm 42 and the second conductive member 32.

The electric leakage operating mechanism 22 of the electric leakage protection electrode 2 and the operating mechanism of the circuit breaker phase electrode 1 are respectively connected with the two handles, the two handles can be pressed down simultaneously when the circuit breaker phase electrode 1 is switched on, the electric leakage operating mechanism 22 of the electric leakage protection electrode 2 and the operating mechanism of the circuit breaker phase electrode 1 rotate to the switching-on position simultaneously, when the handles do not rotate to the switching-on position, the electric leakage operating mechanism 22 of the electric leakage protection electrode 2 can not drive the first contact arm 41 to be contacted with the first conductive piece 31, even if the test button 30 is pressed down, the test loop can not be conducted, and the reliability of the residual current operated circuit breaker is improved.

The utility model discloses a residual current operated circuit breaker, not only through the cooperation between first contact arm 41 and the first conductive piece 31, and the cooperation between second contact arm 42 and the second conductive piece 32, the test circuit that the constitution has double break point, improve residual current operated circuit breaker's reliability, and be equipped with elastic component 5 between second contact arm 42 and the second conductive piece 32, second contact arm 42 and the second conductive piece 32 pass through elastic component 5 formation route, can avoid reaction force F2 that second contact arm 42 and the second conductive piece 32 direct contact arouse too big, the tripping force F1 that leads to electric leakage operating device 22 receives the influence. In addition, the device has the characteristics of simple structure, small number of parts and high reliability.

Further, one end of the elastic member 5 is connected to one of the second contact arm 42 and the second conductive member 32, and the other end of the elastic member 5 is disposed opposite to the other of the second contact arm 42 and the second conductive member 32.

Further, the contact is a torsion spring, the contact includes a spiral portion 40 connected to the housing, and the first contact arm 41 and the second contact arm 42 are connected to both ends of the spiral portion 40, respectively.

As shown in fig. 6, in the first embodiment of the elastic member 5, one end of the elastic member 5 is connected to the second contact arm 42, the other end of the elastic member 5 is bent and extends between the second contact arm 42 and the second conductive member 32, the earth leakage operating mechanism 22 pushes the second contact arm 42, and the second contact arm 42 brings the elastic member 5 into contact with the second conductive member 32.

Further, the elastic member 5 includes a first bending portion 51a and a first contact portion 52a connected to each other, the first contact portion 52a is disposed parallel to the second contact arm 42, and the first bending portion 51a is connected between the first contact portion 52a and the second contact arm 42 to form a U-shaped structure.

As shown in fig. 7 to 8, which illustrate a second embodiment of the elastic member 5, the shape of the second conductive member 32 in fig. 7 and 8 is different, and the structure of the elastic member 5 is substantially the same; one end of the elastic member 5 is connected to the second conductive member 32, the other end of the elastic member 5 is bent and extended between the second contact arm 42 and the second conductive member 32, and the earth leakage operating mechanism 22 pushes the second contact arm 42 to contact the elastic member 5.

Further, the elastic member 5 includes a second bending portion 51b and a second contact portion 52b connected to each other, the second contact portion 52b is disposed parallel to the second conductive member 32, and the second bending portion 51b is connected between the second contact portion 52b and the second conductive member 32 to form a U-shaped structure.

As a third embodiment of the elastic member 5, one end of the elastic member 5 is connected to the housing, the other end of the elastic member 5 extends between the second contact arm 42 and the second conductive member 32, the two ends of the elastic member 5 are respectively engaged with the second contact arm 42 and the second conductive member 32, and the earth leakage operating mechanism 22 pushes the second contact arm 42, and after the second contact arm 42 contacts the elastic member 5, the elastic member 5 is pushed to contact the second conductive member 32.

The elastic element 5 can not only prevent the second contact arm 42 from directly contacting the second conductive member 32, and prevent the reaction force F2 caused by the direct contact from affecting the tripping force F1 of the electrical leakage operating mechanism 22, but also prevent the elastic element 5 from more firmly abutting against the side wall of the second contact arm 42 or the second conductive member 32 under the elastic action of the elastic element 5, so as to prevent the test circuit from being accidentally disconnected due to vibration and other reasons.

As shown in fig. 6, an embodiment of the contact member is a torsion spring, the contact member includes a spiral portion 40 and a first contact arm 41 and a second contact arm 42 connected to two ends of the spiral portion 40, respectively, the second contact arm 42 includes a first torsion arm 42a, a second torsion arm 42b and a third torsion arm 42c connected in a U-shape, the first torsion arm 42a and the third torsion arm 42c are disposed opposite to each other, the second torsion arm 42b is vertically connected between one ends of the first torsion arm 42a and the third torsion arm 42c, the other end of the first torsion arm 42a is connected to the spiral portion 40, a spring shaft 400 is disposed on the housing and is in limit fit with the spiral portion 40, and a spring slot 420 is disposed in limit fit with the first torsion arm 42a, the second torsion arm 42b and the third torsion arm 42c, the other end of the third torsion arm 42c extends out of the spring slot 420 to be connected to one end of a fourth torsion arm 42d, the other end of the fourth torsion arm 42d is connected to the elastic member 5, the elastic member 5 includes a first bending portion 51a and a first contact portion 52a connected to each other, the first contact portion 52a is disposed parallel to the fourth torsion arm 42d, and the first bending portion 51a is connected between the first contact portion 52a and the fourth torsion arm 42d to form a U-shaped structure.

As a second embodiment of the contact member, the other end of the fourth torque arm 42d is not connected to the elastic member 5, and the elastic member 5 is connected to the second conductive member 32.

As shown in fig. 1-4, one end of the test resistor 33 is connected to the connection terminal 37 through a resistor lead 36, the other end of the test resistor 33 is connected to the second conductive member 32, the housing includes an upper fixing plate 34 and a lower fixing plate 35 which are oppositely disposed, the test resistor 33 is disposed between the upper fixing plate 34 and the lower fixing plate 35, the upper fixing plate 34 is disposed opposite to the second contact arm 42, and the upper fixing plate 34 and the lower fixing plate 35 are respectively in limit fit with the second conductive member 32 and the resistor lead 36.

As shown in fig. 5, the second conductive member 32 of the first embodiment is engaged with the contact member 32 of the first embodiment, and the second conductive member 32 is not connected to the elastic member 5.

The second conductive part 32 is sleeved on the upper fixing plate 34 in a U-shape, the second conductive part 32 includes a first conductive part 321 and a third conductive part 323 which are oppositely arranged, and a second conductive part 322 connected between the first conductive part 321 and the third conductive part 323, the first conductive part 321 is connected with one end of the test resistor 33, the first conductive part 321 is in limit fit with one side of the upper fixing plate 34 close to the test resistor 33, the third conductive part 323 is in limit fit with one side of the upper fixing plate 34 close to the second contact arm 42, the third conductive part 323 is matched with the elastic part 5, and the third conductive part 323 is vertically arranged with the elastic part 5.

As shown in fig. 7, the second conductive member 32 of the second embodiment is engaged with the second embodiment of the contact member, and the second conductive member 32 is connected to the elastic member 5.

The second conductive member 32 of the present embodiment is different from the first embodiment of the second conductive member 32 in that the third conductive portion 323 of the second conductive member 32 of the present embodiment does not engage with the upper fixing plate 34 in a limiting manner, but the third conductive portion 323 is spaced apart from the upper fixing plate 34, a buffer space 50 is formed between the third conductive portion 323 and the upper fixing plate 34, the third conductive portion 323 constitutes the second contact portion 52b of the elastic member 5, and the second conductive portion 322 constitutes the second bent portion 51b of the elastic member 5.

As shown in fig. 8, the second conductive member 32 of the third embodiment is engaged with the second embodiment of the contact member, and the second conductive member 32 is connected to the elastic member 5.

The second conductive member 32 of the present embodiment is different from the second conductive member 32 of the second embodiment in that the third conductive portion 323 of the second conductive member 32 of the present embodiment is in spacing fit with the upper fixing plate 34, and the elastic member 5 is connected to an end of the third conductive portion 323 away from the second conductive portion 322, so as to ensure the reliability of the second conductive member 32.

As shown in fig. 1 to 3, an embodiment of the first conductive member 31 is shown, the first conductive member 31 is disposed between one side of the test resistor 33 and the leakage tripping mechanism 23 and above the zero sequence current transformer 21, one end of the first conductive member 31 is disposed opposite to the first contact arm 41, and the other end of the first conductive member 31 is connected to a wire passing through a main loop of the zero sequence current transformer 21.

The first conductive member 31 includes a lead wire contact portion engaged with the first contact arm 41, and a lead wire connection portion connected with a lead wire passing through a main loop of the zero sequence current transformer 21, the housing includes a fixing plate 38 disposed opposite to the first contact arm 41, the lead wire contact portion is sleeved on the fixing plate 38 in a U-shape, the lead wire contact portion includes a first lead wire 311, a third lead wire 313 and a second lead wire 312 connected between the first lead wire 311 and the third lead wire 313, the first lead wire 311 is in limit fit with a side of the fixing plate 38 close to the first contact arm 41, the first lead wire 311 is disposed perpendicular to the first contact arm 41, the third lead wire 313 is connected with one end of the lead wire connection portion, the third lead wire 313 is in limit fit with a side of the fixing plate 38 close to the zero sequence current transformer 21, the lead wire connection portion includes a fourth lead wire 314 connected with the third lead wire 313 and a sixth lead wire 316 connected with a lead wire passing through a main loop of the zero sequence, and a fifth lead wire 315 connected between the fourth lead wire 314 and the sixth lead wire 316, and the fifth lead wire 315 is disposed in parallel with the third lead wire 313. It is understood that the elastic member 5 may be disposed between the first conductive member 31 and the first contact arm 41, and the elastic member 5 is connected to the first conductive member 31 or the first contact arm 41, which all fall within the protection scope of the present invention.

As shown in fig. 3, the earth leakage operating mechanism 22 includes a protection lever 221 pivotally mounted in the housing, and a protection jump 222 and a protection latch 224 pivotally mounted on the protection lever 221 and snap-fitted to each other, respectively, the protection jump 222 is hinged to one end of a protection link 223, the other end of the protection link 223 is hinged to the handle, one end of the protection latch 224 is disposed corresponding to the earth leakage release 23, the second contact arm 42 is disposed between the protection lever 221 and the second conductive member 32, and a pushing boss 220 protruding from the second contact arm 42 is disposed on a side edge of the protection lever 221. When the handle rotates to the switching-on position, the protection lever 221 is driven to rotate and push the second contact part 42 to contact with the second conductive piece 32 through the protection connecting rod 223, the protection trip 222 and the protection latch 224, when the handle rotates to the switching-off position, the protection lever 221 is driven to be away from the second contact part 42, and the second contact part 42 resets under the self elastic action.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. A residual current operated circuit breaker, its characterized in that: the leakage testing mechanism comprises an elastic piece testing button (30), a contact piece, a testing resistor (33), a first conductive piece (31) and a second conductive piece (32) which are respectively connected into a testing loop, the contact piece comprises a first contact arm (41) matched with the testing button (30) and a second contact arm (42) matched with the leakage operating mechanism (22), and the testing button (30) can drive the first contact arm (41) to be in contact with the first conductive piece (31); an elastic piece (5) is arranged between the second contact arm (42) and the second conductive piece (32), the electric leakage operation mechanism (22) can push the second contact arm (42) to be connected with the second conductive piece (32) through the elastic piece (5) to form a path, and the test loop generates test signals when the paths are formed between the first contact arm (41) and the first conductive piece (31) and between the second contact arm (42) and the second conductive piece (32).

2. The residual current operated circuit breaker according to claim 1, characterized in that: one end of the elastic piece (5) is connected with one of the second contact arm (42) and the second conductive piece (32), and the other end of the elastic piece (5) is arranged opposite to the other one of the second contact arm (42) and the second conductive piece (32).

3. The residual current operated circuit breaker according to claim 1, characterized in that: one end of the elastic piece (5) is bent and extends between the second contact arm (42) and the second conductive piece (32).

4. The residual current operated circuit breaker according to claim 1, characterized in that: the contact element is a torsion spring and comprises a spiral part (40) connected with the shell, and a first contact arm (41) and a second contact arm (42) are respectively connected with two ends of the spiral part (40).

5. The residual current operated circuit breaker according to claim 1, characterized in that: one end of the elastic piece (5) is connected with the second contact arm (42), the other end of the elastic piece (5) extends to one side of the second conductive piece (32), the electric leakage operating mechanism (22) pushes the second contact arm (42), and the second contact arm (42) drives the elastic piece (5) to be in contact with the second conductive piece (32); the elastic piece (5) comprises a first bending part (51a) and a first contact part (52a) which are connected, the first contact part (52a) and the second contact arm (42) are arranged in parallel, and the first bending part (51a) is connected between the first contact part (52a) and the second contact arm (42) to form a U-shaped structure.

6. The residual current operated circuit breaker according to claim 1, characterized in that: one end of the elastic piece (5) is connected with the second conductive piece (32), the other end of the elastic piece (5) extends to one side of the second contact arm (42), and the electric leakage operating mechanism (22) pushes the second contact arm (42) to be in contact with the elastic piece (5); the elastic piece (5) comprises a second bending part (51b) and a second contact part (52b) which are connected, the second contact part (52b) and the second conductive piece (32) are arranged in parallel, and the second bending part (51b) is connected between the second contact part (52b) and the second conductive piece (32) to form a U-shaped structure.

7. The residual current operated circuit breaker according to claim 4, characterized in that: the second contact arm (42) comprises a first torsion arm (42a), a second torsion arm (42b) and a third torsion arm (42c) which are connected in a U shape, the first torsion arm (42a) and the third torsion arm (42c) are oppositely arranged, the second torsion arm (42b) is vertically connected between one ends of the first torsion arm (42a) and the third torsion arm (42c), the other end of the first torsion arm (42a) is connected with the spiral part (40), a spring shaft (400) in limit fit with the spiral part (40) is arranged on the shell, a spring groove (420) in limit fit with the first torsion arm (42a), the second torsion arm (42b) and the third torsion arm (42c) is arranged on the shell, the other end of the third torsion arm (42c) extends out of the spring groove (420) to be connected with one end of a fourth torsion arm (42d), the other end of the fourth torsion arm (42d) is connected with the elastic piece (5), and the elastic piece (5) comprises a first folding part (51a) and a first contact part (52a) which are connected, the first contact part (52a) and the fourth torque arm (42d) are arranged in parallel, and the first bending part (51a) is connected between the first contact part (52a) and the fourth torque arm (42d) to form a U-shaped structure.

8. The residual current operated circuit breaker according to claim 1, characterized in that: one end of the test resistor (33) is connected with the wiring terminal (37) through a resistor lead (36), the other end of the test resistor (33) is connected with the second conductive piece (32), the shell comprises an upper fixing plate (34) and a lower fixing plate (35) which are oppositely arranged, the test resistor (33) is arranged between the upper fixing plate (34) and the lower fixing plate (35), the upper fixing plate (34) and the second contact arm (42) are oppositely arranged, and the upper fixing plate (34) and the lower fixing plate (35) are respectively in limit fit with the second conductive piece (32) and the resistor lead (36); the second conductive part (32) is sleeved on the upper fixing plate (34) in a U shape, the second conductive part (32) comprises a first conductive part (321) and a third conductive part (323) which are arranged oppositely, and a second conductive part (322) connected between the first conductive part (321) and the third conductive part (323), the first conductive part (321) is connected with one end of the test resistor (33), the first conductive part (321) is in limit fit with one side of the upper fixing plate (34) close to the test resistor (33), and the third conductive part (323) is in limit fit with one side of the upper fixing plate (34) close to the second contact arm (42).

9. The residual current operated circuit breaker according to claim 1, characterized in that: the first conductive piece (31) comprises a lead wire contact part matched with the first contact arm (41) and a lead wire connecting part connected with a lead wire passing through a main loop of the zero sequence current transformer (21), the shell comprises a fixing plate (38) arranged opposite to the first contact arm (41), the lead wire contact part is sleeved on the fixing plate (38) in a U shape, the lead wire contact part comprises a first lead wire (311) and a third lead wire (313) which are arranged oppositely and a second lead wire (312) connected between the first lead wire (311) and the third lead wire (313), the first lead wire (311) is in limit fit with one side, close to the first contact arm (41), of the fixing plate (38), the first contact arm (311) is vertically arranged with the first contact arm (41), the third lead wire (313) is connected with one end of the lead wire connecting part, and the third lead wire (313) is in limit fit with one side, close to the zero sequence current transformer (21), of the fixing plate (38), the lead connecting part comprises a fourth lead (314) connected with the third lead (313), a sixth lead (316) connected with a lead penetrating through a main loop of the zero sequence current transformer (21), and a fifth lead (315) connected between the fourth lead (314) and the sixth lead (316), wherein the fifth lead (315) and the third lead (313) are arranged in parallel.

10. The residual current operated circuit breaker according to claim 1, characterized in that: the electric leakage operating mechanism (22) comprises a protection lever (221) which is pivotally mounted in the shell, a protection jump buckle (222) and a protection lock catch (224) which are respectively pivotally mounted on the protection lever (221) and are in mutual snap-fit, the protection jump buckle (222) is hinged to one end of a protection connecting rod (223), the other end of the protection connecting rod (223) is hinged to the handle, one end of the protection lock catch (224) is arranged corresponding to the electric leakage release (23), a second contact arm (42) is arranged between the protection lever (221) and a second conductive piece (32), and a pushing boss (220) protruding from the second contact arm (42) is arranged on the side edge of the protection lever (221).

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