CN113161208B - Circuit breaker tripping device with setting current adjusting function - Google Patents
Circuit breaker tripping device with setting current adjusting function Download PDFInfo
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- CN113161208B CN113161208B CN202110417050.XA CN202110417050A CN113161208B CN 113161208 B CN113161208 B CN 113161208B CN 202110417050 A CN202110417050 A CN 202110417050A CN 113161208 B CN113161208 B CN 113161208B
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- 230000006835 compression Effects 0.000 claims abstract description 30
- 238000007906 compression Methods 0.000 claims abstract description 30
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 108700041286 delta Proteins 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
- H01H71/7463—Adjusting only the electromagnetic mechanism
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
The invention discloses a breaker tripping device with a setting current adjusting function, which comprises a magnetic conduction frame, an armature, a stop sleeve, a fixed plate, a compression spring, a guide rod, an impact rod and a setting scale adjusting device, wherein the armature is arranged on the magnetic conduction frame; the middle part of the magnetic conduction frame is provided with a first rectangular opening for the current-carrying copper bar of the circuit breaker to pass through, the upper part of the magnetic conduction frame is provided with an inverted triangle opening for arranging the armature, and the upper part of the inverted triangle opening is provided with a second rectangular opening for dividing the magnetic circuit; the armature is fixedly connected with the impact rod, and when the armature moves, the impact rod is driven to move, and the impact rod impacts the interlocking structure, so that the tripping and opening of the circuit breaker are realized; the middle part of the armature is provided with a round hole for the guide rod to pass through; the guide rod is in interference fit connection with the fixed plate; the compression spring is sleeved on the guide rod, and the upper end of the compression spring is limited by the armature; the setting scale adjusting device can adjust the compression quantity of the compression spring and is used for adjusting the setting current tripping value of the circuit breaker.
Description
Technical Field
The invention relates to the field of switching appliances, in particular to a tripping device of a circuit breaker with a setting current adjusting function.
Background
The circuit breaker refers to a switching device capable of closing, carrying and breaking a current under a normal loop condition and closing, carrying and breaking a current under an abnormal loop condition within a prescribed time. In a rail transit traction power supply system, a circuit breaker is a guarantee of safe operation of the power supply system. Under the abnormal loop condition, the breaking time of the circuit breaker can directly influence the time of the traction power supply equipment for bearing fault current, and the circuit breaker is required to start quick breaking response in a short time in order to protect the safety of the power supply equipment under the abnormal condition.
The circuit breaker is used as a protection element of a power supply loop, and a plurality of tripping devices are arranged for improving the reliability of protection, including shunt tripping, indirect tripping, undervoltage tripping, overload tripping and the like. The overload tripping device is used as a basic tripping device of the circuit breaker, and is triggered when the current value or the rising rate of the protected circuit exceeds a preset value, so that the opening operation of the circuit breaker is realized. The device is not limited by a control loop of the circuit breaker, and is a device directly acting on tripping. At present, in a direct current traction power supply system, a main stream overload tripping device is influenced by a disc spring variable stiffness characteristic, a motion structure and a setting current scale adjusting device, a setting tripping current value is extremely unstable, and a phenomenon of setting current value drift often occurs.
Disclosure of Invention
In order to solve the above-mentioned problems, an object of the present invention is to provide a trip device for a circuit breaker with a set current adjusting function.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A breaker tripping device with a setting current adjusting function comprises a magnetic conduction frame, an armature, a stop sleeve, a fixed plate, a compression spring, a guide rod, an impact rod and a setting scale adjusting device;
The middle part of the magnetic conduction frame is provided with a first rectangular opening for the current-carrying copper bar of the circuit breaker to pass through, the upper part of the magnetic conduction frame is provided with an inverted triangle opening for arranging the armature, and the upper part of the inverted triangle opening is provided with a second rectangular opening for dividing the magnetic circuit;
the armature is fixedly connected with the impact rod, and when the armature moves, the impact rod is driven to move, and the impact rod impacts the interlocking structure to realize tripping and opening of the circuit breaker;
A round hole is formed in the middle of the armature and used for the guide rod to pass through;
The fixed plate is fixedly arranged at the top of the magnetic conduction frame, the stop sleeve is arranged at the top end of the armature, and the fixed plate and the stop sleeve are used for limiting the armature;
the guide rod is in interference fit connection with the fixed plate;
the compression spring is sleeved on the guide rod, and the upper end of the compression spring is limited by the armature;
The setting scale adjusting device can adjust the compression quantity of the compression spring and is used for adjusting the setting current tripping value of the circuit breaker.
In some embodiments, the tuning current scale adjustment device comprises a threaded sleeve, a large bevel gear, a small bevel gear, a worm wheel, and a dial;
the guide rod is provided with threads and is connected with a threaded sleeve screw pair;
The big bevel gear is connected with the threaded sleeve through a flat key;
The bevel pinion and the worm are fixedly connected together;
the small bevel gear is meshed with the large bevel gear, and the turbine is meshed with the worm;
the turbine is fixedly connected with the dial;
the worm is provided with a hexagonal square hole which is used for being matched with an external hexagonal wrench for a user to operate.
In some embodiments, the armature is inverted triangular in shape, consisting of three parts: an upper armature, a lower armature, and a non-magnetic conductor; the non-magnetizer is arranged in the middle of the armature; the upper armature, the lower armature and the non-magnetizer are fixedly connected;
The magnetic conduction frame, the lower armature and a working air gap between the lower armature and the lower armature form a first magnetic loop, the magnetic conduction frame, the upper armature and the working air gap between the upper armature form a second magnetic loop, the working air gap of the second magnetic loop is smaller than that of the first magnetic loop, and the magnetic flux area of the second magnetic loop is smaller than that of the first magnetic loop.
In some embodiments, two short-circuit rings are symmetrically arranged on the second magnetic circuit formed by the magnetic conduction frame, the upper armature and the working air gap between the upper armature and the upper armature.
In some embodiments, the magnetic conductive frame further comprises a positioning bending plate, wherein the positioning bending plate is fixed on the magnetic conductive frame, a positioning hole is formed in the positioning bending plate, and the striking rod passes through the positioning hole.
Compared with the prior art, the invention has the beneficial effects that:
according to the circuit breaker tripping device with the setting current adjusting function, when the loop current is abnormal, the circuit breaker can rapidly realize tripping and breaking, so that the safety of power supply equipment is ensured; and the adjusting device for the adjustment current scale adopts a bevel gear and worm gear structure, the worm gear and worm gear has self-locking property, the stability of adjustment scales can be ensured, meanwhile, the adjusting scale tool adopts a universal outer hexagonal wrench, the operation is simple and convenient, the reliability is high, the scale indication is easy to observe and read, and the user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a circuit breaker trip device with a set current adjustment function provided by the invention;
fig. 2 is a schematic structural diagram of a magnetic conductive frame and a shorting ring of the circuit breaker trip device;
FIG. 3 is a schematic diagram of two magnetic circuits and a working air gap of a circuit breaker trip unit;
FIG. 4 is a schematic view of the lateral partial cross-sectional view of FIG. 1;
fig. 5 is a schematic view of a partial sectional view of the trip principle of the circuit breaker trip device;
FIG. 6 is a schematic installation diagram of a tuning current scale adjustment device;
FIG. 7 is a front view of the tuning current scale adjustment device;
FIG. 8 is a side view of the tuning current scale adjustment device;
fig. 9 is a schematic diagram of an operation using an external hex wrench.
Reference numerals illustrate:
1. A magnetic conduction frame; 2. an armature; 3. a stop sleeve; 4. a shorting ring; 5. a fixing plate; 6. a compression spring; 7. setting scale adjusting device; 8. a striker rod; 9. a guide bent plate; 10. a guide rod; 11. an outer hexagonal wrench; 21. an upper armature; 22. a non-magnetic conductor; 23. a lower armature; 71. a threaded sleeve; 72. a large bevel gear; 73. bevel pinion; 74. a worm; 75. a turbine; 76. a dial scale.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the present invention easy to understand, the following further describes how the present invention is implemented with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, 2 and 3, the invention provides a tripping device of a circuit breaker with a setting current adjusting function, which comprises a magnetic conduction frame 1, an armature 2, a stop sleeve 3, a fixed plate 5, a compression spring 6, a guide rod 10, a striking rod 8 and a setting scale adjusting device 7.
The middle part of the magnetic conduction frame 1 is provided with a first rectangular opening for the current-carrying copper bar of the circuit breaker to pass through, the upper part of the magnetic conduction frame is provided with an inverted triangle opening for arranging the armature 2, and the upper part of the inverted triangle opening is provided with a second rectangular opening for dividing the magnetic circuit; the armature 2 is in the shape of an inverted triangle and consists of three parts: an upper armature 21, a lower armature 23, and a non-magnetic conductor 22; the non-magnetizer 22 is arranged in the middle of the armature 2; the upper armature 21, the lower armature 23 and the non-magnetic conductor 22 are fixedly connected.
The magnetic conduction frame 1 forms a first magnetic circuit with the lower armature 21 and a working air gap delta 1 between the two, the magnetic conduction frame 1 forms a second magnetic circuit with the upper armature 23 and a working air gap delta 2 between the two, the working air gap delta 2 of the second magnetic circuit is smaller than the working air gap delta 2 of the first magnetic circuit, and the magnetic flux area of the second magnetic circuit is smaller than the magnetic flux area of the first magnetic circuit.
The armature 2 is fixedly connected with the striking rod 8, when the armature 2 moves, the striking rod 8 is driven to move, and the striking rod 8 strikes the interlocking structure, so that the tripping and opening of the circuit breaker are realized.
Further, two short-circuit rings 4 are symmetrically arranged on the second magnetic circuit formed by the magnetic conduction frame 1, the upper armature 21 and the working air gap between the two.
The circuit breaker tripping device further comprises a positioning bent plate 9, wherein the positioning bent plate 9 is fixed on the magnetic conduction frame 1, a positioning hole is formed in the positioning bent plate 9, and the impact rod 9 penetrates through the positioning hole.
A round hole is formed in the middle of the armature 2 and used for the guide rod 10 to pass through; the fixed plate 5 is fixedly arranged at the top of the magnetic conduction frame 1, the stop sleeve 3 is arranged at the top end of the armature 2, and the fixed plate 5 and the stop sleeve 3 are used for limiting the armature 2; the guide rod 10 is connected with the fixed plate 5 in an interference fit manner; the compression spring 6 is sleeved on the guide rod 10, and the upper end of the compression spring is limited by the armature 2.
The working principle is as follows: the first magnetic circuit generates a downward electromagnetic attraction force F1 on the armature 2, and the second magnetic circuit generates an upward electromagnetic attraction force F2 on the armature 2, so that the armature 2 receives the electromagnetic force. In the process of stably rising the circuit current of the circuit breaker, at the initial moment, as delta 2 is less than delta 1 and F2 is more than F1, the armature 2 receives upward electromagnetic attraction force. The armature 2 remains stationary due to the upper end limiting the armature 2. When the current rises to a certain value, the magnetic flux of the second magnetic circuit tends to saturate and F2 no longer increases. As the current increases further, the first magnetic circuit generates a downward electromagnetic attraction force F1 to the armature 2 to increase further, and finally the armature 2 pulls downward against the resistance of the spring 3 to release the circuit breaker. Due to the existence of the second magnetic loop, the upper limit of the tripping current of the high-current tripping device is greatly increased under the condition that the rigidity of the spring 3 is not changed, and the circuit breaker can be used for short-circuit protection with larger capacity.
When the loop current is subjected to the fluctuation of external interference, a magnetic field which changes along with the fluctuation of the current is generated in a magnetic loop formed by the magnetic conduction frame 1, the armature 2 and the working air gap, the electromagnetic force applied to the armature 2 also changes along with the fluctuation of the current, under the critical condition, if the electromagnetic force applied to the armature 2 fluctuates near the resistance value of the spring 3, the resultant force of the electromagnetic force and the spring force applied to the armature 2 can generate the zero crossing condition, at the moment, the armature can shake up and down, and if the shake amplitude is too large, the false tripping phenomenon of the circuit breaker can occur. Preferably, in order to solve this problem, two short-circuit rings 4 are symmetrically arranged on the magnetic conduction frame 1 of the second magnetic circuit, when the magnetic field changes along with the current fluctuation, induced eddy currents are generated in the short-circuit rings 4, the magnetic flux passing through the second magnetic circuit is blocked from changing, the electromagnetic force born by the armature 2 is also delayed from changing, the electromagnetic attraction force of the armature 2 is compensated, in this case, the electromagnetic force born by the armature 2 is always smaller than the resistance of the spring 3, so that the shaking of the armature 2 can be reduced, and the false tripping action caused by interference of a circuit breaker is avoided.
Further, if the expected trip current value of the circuit breaker is to be fine-tuned, the compression amount of the compression spring 6 needs to be adjusted. Referring to fig. 6 to 9, the circuit breaker trip device preferably further includes a setting current scale adjusting device 7 provided at the lower end of the magnet conductive frame 1 for setting an initial compression amount of the compression spring 6. The greater the initial compression of the compression spring 6, the greater the resistance generated by the compression spring 6 against the armature 2, the greater the exciting current required to overcome the spring resistance, and the greater the expected trip current value of the circuit breaker.
Preferably, the setting current scale adjustment device 7 comprises a threaded sleeve 71, a large bevel gear 72, a small bevel gear 73, a worm 74, a turbine 75 and a dial 76; the spring guide rod 8 is provided with threads and is connected with a screw pair of the threaded sleeve 71; the large bevel gear 72 is connected with the threaded sleeve 71 through a flat key; bevel pinion 73 and worm 74 are fixedly connected together; the small bevel gear 73 intermeshes with the large bevel gear 72, and the worm gear 75 intermeshes with the worm 74; turbine 75 is fixedly coupled to dial 76; the worm 74 is provided with hexagonal square holes for cooperating with an external hexagonal wrench 15 for operation by a user.
The working principle of the user operation is as follows: the worm 74 is provided with a hexagonal square hole, the outer hexagonal wrench 11 is operated, the worm 74 is rotated, the worm drives the bevel pinion 73 to rotate, the bevel pinion 73 is meshed with the bevel pinion 72 to drive the threaded sleeve 71 to ascend or descend along the axial direction of the guide rod 10, the up-and-down spiral motion of the threaded sleeve 71 compresses the compression spring 6 to different degrees, and the resistance of the compression spring 6 to the triangular magnetic conduction block 2 is changed accordingly. At the same time, when the worm 74 is rotated, the worm wheel 75 also performs engagement transmission, and the worm wheel 75 and the dial 76 are fixedly connected together, wherein the engagement transmission of the worm wheel corresponds to different indication scales. The indicating scale is related to the compression amount of the spring and the expected tripping current value of the breaker, the indicating scale under a certain compression amount of the spring is recorded, the tripping current value of the breaker under the state is obtained through a setting test, and the scale value corresponding to the expected tripping current is obtained. According to the actual circuit operation condition of the circuit breaker, when different expected tripping current values are needed, the user only needs to adjust the scales to the positions corresponding to the expected tripping current. Particularly, the turbine worm has a self-locking function, so that the circuit breaker setting current scale adjusting device is stable in structure and cannot cause vibration displacement due to the impact of the switching-on and switching-off operation of the circuit breaker.
In summary, the circuit breaker tripping device with the setting current adjusting function provided by the invention can enable the circuit breaker to rapidly realize tripping and opening when the loop current is abnormal, thereby ensuring the safety of power supply equipment; and the adjusting device for the adjustment current scale adopts a bevel gear and worm gear structure, the worm gear and worm gear has self-locking property, the stability of adjustment scales can be ensured, meanwhile, the adjusting scale tool adopts a universal outer hexagonal wrench, the operation is simple and convenient, the reliability is high, the scale indication is easy to observe and read, and the user experience is improved.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (2)
1. The breaker tripping device with the setting current adjusting function is characterized by comprising a magnetic conduction frame (1), an armature (2), a stop sleeve (3), a fixed plate (5), a compression spring (6), a guide rod (10), an impact rod (8) and a setting current scale adjusting device (7);
The middle part of the magnetic conduction frame (1) is provided with a first rectangular opening for a current-carrying copper bar of the circuit breaker to pass through, the upper part of the magnetic conduction frame is provided with an inverted triangle opening for arranging the armature (2), and the upper part of the inverted triangle opening is provided with a second rectangular opening for dividing a magnetic loop;
the armature (2) is fixedly connected with the impact rod (8), and when the armature (2) moves, the impact rod (8) is driven to move, and the impact rod (8) impacts the interlocking structure to realize tripping and opening of the circuit breaker;
a round hole is formed in the middle of the armature (2) and used for the guide rod (10) to pass through;
The fixed plate (5) is fixedly arranged at the top of the magnetic conduction frame (1), the stop sleeve (3) is arranged at the top end of the armature (2), and the fixed plate (5) and the stop sleeve (3) are used for limiting the armature (2);
The guide rod (10) is connected with the fixed plate (5) in an interference fit manner;
the compression spring (6) is sleeved on the guide rod (10), and the upper end of the compression spring is limited by the armature (2);
The setting current scale adjusting device (7) can adjust the compression amount of the compression spring (6) and is used for adjusting the setting current tripping value of the circuit breaker;
The setting current scale adjusting device (7) comprises a threaded sleeve (71), a large bevel gear (72), a small bevel gear (73), a worm (74), a turbine (75) and a dial (76);
the guide rod (10) is provided with threads and is connected with a screw pair of the threaded sleeve (71);
the big bevel gear (72) is connected with the threaded sleeve (71) through a flat key;
The bevel pinion (73) and the worm (74) are fixedly connected together;
The small bevel gear (73) is meshed with the large bevel gear (72), and the turbine (75) is meshed with the worm (74);
The turbine (75) is fixedly connected with the dial (76);
the worm (74) is provided with a hexagonal square hole which is used for being matched with an external outer hexagonal wrench (11) so as to be operated by a user;
the armature (2) is in an inverted triangle shape and consists of three parts: an upper armature (21), a lower armature (23) and a non-magnetic conductor (22); the non-magnetizer (22) is arranged in the middle of the armature (2); the upper armature (21), the lower armature (23) and the non-magnetizer (22) are fixedly connected;
The magnetic conduction frame (1), the lower armature (23) and a working air gap between the lower armature and the lower armature form a first magnetic loop, the magnetic conduction frame (1), the upper armature (21) and a working air gap between the upper armature and the upper armature form a second magnetic loop, the working air gap of the second magnetic loop is smaller than that of the first magnetic loop, and the magnetic flux area of the second magnetic loop is smaller than that of the first magnetic loop;
Two short-circuit rings (4) are symmetrically arranged on a second magnetic circuit formed by the magnetic conduction frame (1), the upper armature (21) and a working air gap between the upper armature and the upper armature.
2. The circuit breaker tripping device with the setting current adjusting function according to claim 1, further comprising a positioning bent plate (9), wherein the positioning bent plate (9) is fixed on the magnetic conduction frame (1), a positioning hole is formed in the positioning bent plate (9), and the striking rod (8) penetrates through the positioning hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110417050.XA CN113161208B (en) | 2021-04-19 | 2021-04-19 | Circuit breaker tripping device with setting current adjusting function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110417050.XA CN113161208B (en) | 2021-04-19 | 2021-04-19 | Circuit breaker tripping device with setting current adjusting function |
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| Publication Number | Publication Date |
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| CN113161208A CN113161208A (en) | 2021-07-23 |
| CN113161208B true CN113161208B (en) | 2024-06-25 |
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| CN202110417050.XA Active CN113161208B (en) | 2021-04-19 | 2021-04-19 | Circuit breaker tripping device with setting current adjusting function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113725046B (en) * | 2021-09-15 | 2024-04-23 | 江苏大全凯帆电器有限公司 | DC overcurrent tripping device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161210A (en) * | 2021-04-19 | 2021-07-23 | 武汉长海电气科技开发有限公司 | Double-magnetic-circuit heavy-current release of circuit breaker |
| CN113555257A (en) * | 2021-04-19 | 2021-10-26 | 武汉长海电气科技开发有限公司 | Overload current tripping device of circuit breaker |
| CN214797300U (en) * | 2021-04-19 | 2021-11-19 | 武汉长海电气科技开发有限公司 | Circuit breaker tripping device with setting current adjusting function |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299030A (en) * | 2010-06-25 | 2011-12-28 | Abb股份公司 | Magnetic system and installing switch device with magnetic system |
| CN101916694B (en) * | 2010-08-17 | 2012-07-11 | 常熟开关制造有限公司(原常熟开关厂） | Current regulating device of thermomagnetic release of circuit breaker |
| CN203103245U (en) * | 2013-03-13 | 2013-07-31 | 浙江正泰电器股份有限公司 | Circuit breaker tripping mechanism capable of adjusting short-circuit instantaneous setting current |
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2021
- 2021-04-19 CN CN202110417050.XA patent/CN113161208B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161210A (en) * | 2021-04-19 | 2021-07-23 | 武汉长海电气科技开发有限公司 | Double-magnetic-circuit heavy-current release of circuit breaker |
| CN113555257A (en) * | 2021-04-19 | 2021-10-26 | 武汉长海电气科技开发有限公司 | Overload current tripping device of circuit breaker |
| CN214797300U (en) * | 2021-04-19 | 2021-11-19 | 武汉长海电气科技开发有限公司 | Circuit breaker tripping device with setting current adjusting function |
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