A molded case circuit breaker

Abstract

The application relates to the technical field of circuit control, and discloses a molded case circuit breaker, which comprises a main shell and a break control switch installed in the main shell; the inside of the main shell further comprises a data acquisition mechanism, a data processing mechanism, a first controller, a pre-warning processing mechanism and a second control module; the data acquisition mechanism and the data processing mechanism are arranged, the line temperature is detected through a temperature detection module, the current size is detected through a current detection module, the temperature information and the current information are received by a section timing module and are divided in multiple time sections, the temperature and current increasing and decreasing trends are formed, the temperature and current changes in the section time are received by a fault analysis module, the highest temperature and the current threshold value set in a current threshold value module are compared, and the temperature and current increasing trends in the section time are used to automatically identify whether tripping is caused by short circuit or overload.

Description

Technical Field

[0001] This invention relates to the field of circuit control technology, and more specifically to a molded case circuit breaker. Background Technology

[0002] Low-voltage circuit breakers are ubiquitous at electrical product exhibitions and appliance markets, especially molded case circuit breakers, which are very popular. Molded case circuit breakers have two-stage protection functions: long overload delay and instantaneous short circuit. They can also be used in conjunction with leakage current devices, measuring devices, electrical control modules, etc. In low-voltage power distribution systems, they are often used as terminal switches or branch switches, replacing the fuses and knife switches that were commonly used in the past.

[0003] When a short circuit or overload occurs in an existing molded case circuit breaker, the current will rise to hundreds or thousands of times within a certain period of time. The current flows through the coil installed inside the molded case circuit breaker, which will generate a strong magnetic field around the coil. The magnitude of the magnetic field generated around the coil is proportional to the magnitude of the current. This magnetic field will pull the metal cylinder installed at the top of the coil downward. The pin connected to the bottom of the metal cylinder will push the central lever. The head of the central lever will press down the rear conductive rod (207), which will stretch the first spring (202) connected to the bottom of the central lever (201) and compress the rectangular lever (203) connected to the top of the central lever (201). At this time, the torsion lever (205) will rotate downward under the action of forward torque force, thereby activating the circuit breaker and disconnecting the circuit.

[0004] However, it also has certain shortcomings: using the magnetic field generated by the current flowing through the coil as the medium to trigger the circuit breaker means that the circuit will only break when the current reaches a threshold and generates a magnetic field sufficient to drive the metal cylinder and pin down. This makes it impossible to determine whether the tripping is caused by a short circuit or an overload, and thus it is impossible to troubleshoot the cause of the fault immediately. In the event of a short-term overload caused by too many electrical appliances, reducing the number of appliances in time will prevent the tripping caused by the overload. Therefore, a short-term overload warning device is needed to remind users to avoid unnecessary trouble caused by overload tripping. At the moment of tripping, the high-intensity current can break down the air inside the circuit breaker and even ignite the molded casing, causing a fire.

[0005] Therefore, there is an urgent need for a new type of molded case circuit breaker. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a molded case circuit breaker to solve the problems of inability to determine the cause of tripping, overload warning, and avoid current breakdown of air after tripping in the prior art.

[0007] The present invention provides the following technical solution: a molded case circuit breaker, comprising a main housing and a disconnect switch installed inside the main housing, a negative pressure assembly installed on one side of the top of the main housing, a telescopic mechanism installed on the top of the inner cavity of the main housing, and a vent valve connected to the disconnect switch installed in the inner cavity of the main housing. The internal components of the main unit casing also include a data acquisition mechanism, a data processing mechanism, a first control module, an early warning processing mechanism, and a second control module; wherein, The data acquisition mechanism includes a temperature detection module and a current detection module, wherein the temperature detection module is used to detect the line temperature and generate temperature value information, and the current detection module is used to detect the line current and generate current value information. The data processing mechanism includes a segment timing module, a fault analysis module, and a current threshold module. The segment timing module divides and records the temperature and current values ​​received within a segment time and forms a trend curve. The fault analysis module receives the temperature and current changes within the segment time and compares them with the highest temperature and current threshold set in the current threshold module to make a judgment. The first control module is used to receive the two judgment results output by the fault analysis module and form corresponding control commands to act on and control the negative pressure component and the early warning processing mechanism respectively. The early warning processing mechanism includes an early warning module, a response duration module, and a duration comparison module. The early warning module is used to receive control commands from the first control module and issue a response alarm. The response duration module is used to receive response information from the early warning module and record the response duration. The duration comparison module compares the received alarm response duration information with the response threshold set by the response threshold module. The second control module is used to receive the judgment result output by the duration comparison module and generate a corresponding control command, thereby acting on and controlling the negative pressure component.

[0008] Furthermore, after the data acquisition mechanism collects data, it transmits it to the data processing mechanism. The data processing mechanism analyzes and processes the data, then outputs values ​​to the first control module, generating two different control commands. These commands are then output to the negative pressure component and the early warning processing mechanism, respectively, resulting in the following specific control methods: The temperature detection module detects the line temperature, while the current detection module detects the current magnitude. The segment timing module receives the temperature and current information and divides them into multiple time segments, forming the temperature and current increase and decrease trends. The fault analysis module receives the temperature and current changes within this segment and compares them with the highest temperature and current threshold set in the current threshold module to make a judgment and output two judgment results. When the temperature and current increase rapidly within a certain period of time and reach the set threshold, the first control module receives the judgment result output by the fault analysis module and generates a control command to be sent to the telescopic mechanism. When the temperature and current increase rapidly or slowly within a certain period of time and reach the set threshold, the first control module receives the judgment result output by the fault analysis module and forms a control command to send to the early warning processing mechanism.

[0009] Furthermore, the early warning processing mechanism receives another output control command signal from the first control module. After secondary analysis and processing by the early warning processing mechanism, the result information is transmitted to the second control module. The second control module then transmits the received information to the negative pressure component again to control the negative pressure component. The specific control method is as follows: After receiving a control command from the first control module, the early warning module issues an alarm. Then, the response duration module receives the output signal from the early warning module, measures the response duration, and sends it to the duration comparison module. The duration comparison module then compares the received alarm response duration information with the response threshold set by the response threshold module. If the overloaded electrical appliance is unplugged when the early warning module issues an alarm, the early warning module stops responding. Otherwise, if the overloaded electrical appliance is not removed, the duration comparison module outputs an excessively long response time information to the first control module. The first control module then generates a control command and sends it to the telescopic mechanism.

[0010] Furthermore, the disconnect switch includes a central lever. The bottom end of the tail of the central lever is connected to the head of the rear conductive rod via a first spring. The top end of the tail of the central lever is movably connected to a torsion lever via a rectangular lever. The bottom end of the rectangular lever is fixedly connected to one end of a second spring. The top end of the second spring, the axis of the torsion lever, the center of gravity of the central lever, and the middle part of the rear conductive rod are all installed in the inner cavity of the main housing via a fixed shaft, and are all movably connected to the fixed shaft.

[0011] Furthermore, the bottom end of the rear conductive rod is fixedly connected to the rear conductive block installed at the bottom of the main unit housing, the top end of the rear conductive rod touches the bottom end of the front conductive rod, and the top end of the front conductive rod is fixedly sleeved with the front conductive block installed at the top of the main unit housing.

[0012] Furthermore, the front wall of the main housing has an opening for rotating the lever connected to the side dial. The top of the opening is movably connected to a flap via a hinge, and the flap seals the opening when closed.

[0013] Furthermore, the telescopic mechanism includes a buffer cylinder and a telescopic tube fixedly connected to its bottom, wherein a movable rod and a piston plate fixedly connected to the top of the movable rod are movably sleeved inside the telescopic tube.

[0014] Furthermore, the cross-sectional diameter of the movable rod is smaller than that of the piston plate, the cross-section of the piston plate is adapted to the cross-sectional diameter of the inner cavity of the telescopic tube, a through cavity is provided at the connection between the buffer cylinder and the telescopic tube, and the inner cavity of the buffer cylinder is filled with SF6 gas.

[0015] Furthermore, the vent valve includes a baffle plate, the back of which is fixedly connected to the surface of the fixed shaft, and the front of which is connected to the pressing block via a third spring. The pressing block passes through a through hole in the front wall of the main housing.

[0016] The technical effects and advantages of this invention are as follows: This invention, by incorporating a data acquisition mechanism and a data processing mechanism, facilitates the use of a temperature detection module to detect line temperature and a current detection module to detect current magnitude. A segment timing module receives temperature and current information and divides it into multiple time segments, generating trends in temperature and current increases and decreases. A fault analysis module receives these temperature and current changes within a given time segment and compares them with the highest temperature and current threshold values ​​set by the current threshold module, making a judgment and outputting two possible results. Furthermore, based on the increasing trends of temperature and current within a given time segment, it can automatically identify whether the tripping issue is due to a short circuit or an overload, allowing for different circuit controls. This invention, by incorporating an early warning processing mechanism, facilitates the issuance of an alarm after the early warning module receives control commands from the first control module. The response duration module then receives the output signal from the early warning module, measures the response duration, and transmits it to the duration comparison module. The duration comparison module then compares the received alarm response duration information with the response threshold set by the response threshold module. If the overloaded electrical appliance is unplugged when the early warning module issues an alarm, the early warning module stops responding. Conversely, if the overloaded electrical appliance is not removed, the duration comparison module outputs an excessively long response time to the first control module. The first control module then generates control commands and sends them to the telescopic mechanism, thus achieving overload early warning, reminding users to remove overloaded electrical appliances in a timely manner to avoid instantaneous overload tripping, and automatically disconnecting the circuit when five people are troubleshooting. This invention incorporates a negative pressure component, which, upon receiving a control command, draws suction from the sealed inner cavity of the main unit housing, creating a negative pressure. This causes the movable rod, inserted into the telescopic tube, to move downwards due to the pressure difference, pressing down on the head of the central lever. The central lever then rotates downwards along a fixed axis, pressing down on the head of the rear conductive rod, causing the head of the rear conductive rod to gradually move away from the bottom of the front conductive rod. At this point, the second spring connected to the top of the central lever contracts, while the first spring connected to the bottom of the central lever stretches. This causes the torsional lever to rotate downwards under the influence of a forward torque force. The suction creates negative pressure within the main unit housing, and the telescopic mechanism, under the pressure difference, triggers the movable rod to move downwards, initiating a tripping event. Simultaneously, the vacuum environment prevents high-intensity current from breaking down the air inside the circuit breaker, ensuring safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the flip-top structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the disconnection control switch structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the vent valve structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the circuit breaking control system of the present invention.

[0023] The attached diagram is labeled as follows: 1. Main casing; 2. Disconnect switch; 201. Central lever; 202. First spring; 203. Rectangular lever; 204. Second spring; 205. Torsion lever; 206. Fixed shaft; 207. Rear conductive rod; 208. Front conductive rod; 3. Flip cover; 4. Air vent valve; 401. Wind deflector; 402. Third spring; 403. Pressing block; 5. Rear conductive block; 6. Front conductive block; 7. Negative pressure assembly; 8. Telescopic mechanism; 801. Buffer cylinder; 802. Extension... 803. Retractor tube; 804. Piston plate; 9. Movable rod; 10. Data acquisition mechanism; 11. Temperature detection module; 12. Current detection module; 13. Data processing mechanism; 14. Segment timing module; 15. Fault analysis module; 16. Current threshold module; 17. First control module; 18. Early warning processing mechanism; 19. Early warning module; 10. Response time module; 11. Time comparison module; 12. Response threshold module; 13. Second control module. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The molded case circuit breaker involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Reference Figure 1-6 The present invention provides a molded case circuit breaker, including a main housing 1 and a disconnect switch 2 installed inside the main housing 1. A negative pressure assembly 7 is installed on one side of the top of the main housing 1, a telescopic mechanism 8 is installed on the top of the inner cavity of the main housing 1, and a vent valve 4 connected to the disconnect switch 2 is also installed in the inner cavity of the main housing 1.

[0026] The main unit casing 1 also includes a data acquisition mechanism 9, a data processing mechanism 10, a first control module 11, an early warning processing mechanism 12, and a second control module 13; among which, The data acquisition mechanism 9 includes a temperature detection module 901 and a current detection module 902. The temperature detection module 901 is used to detect the line temperature and generate temperature value information, and the current detection module 902 is used to detect the line current and generate current value information. The data processing mechanism 10 includes a segment timing module 1001, a fault analysis module 1002, and a current threshold module 1003. The segment timing module 1001 divides and records the temperature and current values ​​received within a segment time and forms a trend curve. The fault analysis module 1002 receives the temperature and current changes within the segment time and compares them with the highest temperature and current threshold set in the current threshold module 1003 to make a judgment. The first control module 11 receives two judgment results output by the fault analysis module 1002 and generates corresponding control commands to act on and control the negative pressure component 7 and the early warning processing mechanism 12, respectively. The two paths are path a and path b (marked on...). Figure 6 ); The early warning processing mechanism 12 includes an early warning module 1201, a response duration module 1202, and a duration comparison module 1203. The early warning module 1201 is used to receive control commands from the first control module 11 and issue a response alarm. The response duration module 1202 is used to receive response information from the early warning module 1201 and record the response duration. The duration comparison module 1203 compares the received alarm response duration information with the response threshold set by the response threshold module 1204. The second control module 13 is used to receive the judgment result output by the duration comparison module 1203 and generate a corresponding control command, thereby acting on and controlling the negative pressure component 7.

[0027] In use, data information is collected by the data acquisition mechanism 9 and then transmitted to the data processing mechanism 10. After data analysis and processing by the data processing mechanism 10, the output value is sent to the first control module 11, forming two different control commands, which are respectively output to the negative pressure component 7 and the early warning processing mechanism 12 to form their respective control methods: The temperature detection module 901 detects the line temperature, while the current detection module 902 detects the current magnitude. The segment timing module 1001 receives the temperature and current information and divides them into multiple time segments, forming the temperature and current increase and decrease trends. The fault analysis module 1002 receives the temperature and current changes within this segment and compares them with the highest temperature and current threshold set in the current threshold module 1003 to make a judgment and output two judgment results. When the temperature and current increase rapidly within a certain period of time and reach the set threshold, the first control module 11 receives the judgment result output by the fault analysis module 1002 and forms a control command to send to the telescopic mechanism 8. When the temperature and current increase rapidly or slowly within a certain period of time and reach the set threshold, the first control module 11 receives the judgment result output by the fault analysis module 1002 and forms a control command to be sent to the early warning processing mechanism 12.

[0028] In use, after receiving another output control command signal from the first control module 11 (path b), the early warning processing mechanism 12 performs secondary analysis and processing and then transmits the result information to the second control module 13. The second control module 13 then transmits the received information again to the negative pressure component 7 (path d) to control the negative pressure component 7. The specific control method is as follows: After receiving the control command from the first control module 11, the early warning module 1201 issues an alarm. Then, the response duration module 1202 receives the output signal from the early warning module 1201, measures the response duration, and sends it to the duration comparison module 1203. The duration comparison module 1203 then compares the received alarm response duration information with the response threshold set by the response threshold module 1204. If the overloaded electrical appliance is unplugged when the early warning module 1201 issues the alarm, the early warning module 1201 stops responding. Otherwise, if the overloaded electrical appliance is not removed, the duration comparison module outputs the excessively long response time information to the first control module 11. Then, the first control module 11 generates a control command and sends it to the telescopic mechanism 8.

[0029] Reference Figure 2 and Figure 4 The disconnect switch 2 includes a central lever 201. The bottom end of the tail of the central lever 201 is connected to the head of the rear conductive rod 207 via a first spring 202. The top end of the tail of the central lever 201 is movably connected to a torsion lever 205 via a rectangular lever 203. The bottom end of the rectangular lever 203 is fixedly connected to one end of a second spring 204. The top end of the second spring 204, the axis of the torsion lever 205, the center of gravity of the central lever 201, and the middle part of the rear conductive rod 207 are all installed in the inner cavity of the main housing 1 via a fixed shaft 206, and are all movably sleeved with the fixed shaft 206, that is, they can rotate along the surface of the fixed shaft 206. The bottom end of the rear conductive rod 207 is fixedly connected to the rear conductive block 5 installed at the bottom of the main unit housing 1, the top end of the rear conductive rod 207 touches the bottom end of the front conductive rod 208, and the top end of the front conductive rod 208 is fixedly sleeved with the front conductive block 6 installed at the top of the main unit housing 1.

[0030] In this embodiment, it should be specifically noted that the front wall of the main body housing 1 has an opening for rotating the pressure handle connected to the side of the torsion lever 205. The top of the opening is movably connected to the flip cover 3 via a hinge, and the opening is sealed when the flip cover 3 is closed.

[0031] In use, flip the cover 3 upwards along the hinge to expose the torsion lever 205, and then flip the torsion lever 205 to connect the circuit or cause the circuit to trip. Current flows into the wire connected to the top of the front conductive block 6, flows into the rear conductive rod 207 through the front conductive rod 208, and then flows out from the wire connected to the bottom of the rear conductive block 5.

[0032] Reference Figure 2 and 3 The telescopic mechanism 8 includes a buffer cylinder 801 and a telescopic tube 802 fixedly connected to its bottom. The telescopic tube 802 is movably sleeved inside a movable rod 804 and a piston plate 803 fixedly connected to the top of the movable rod 804.

[0033] In this embodiment, it should be specifically noted that the cross-sectional diameter of the movable rod 804 is smaller than the cross-sectional diameter of the piston plate 803, and the cross-section of the piston plate 803 is adapted to the cross-sectional area of ​​the inner cavity of the telescopic tube 802. A through cavity is provided at the connection between the buffer cylinder 801 and the telescopic tube 802, and the inner cavity of the buffer cylinder 801 is filled with SF6 gas. This gas serves as a buffer gas, and even if leakage occurs, the current cannot break down, making it a safe gas.

[0034] Reference Figure 2 and Figure 5The vent valve 4 includes a baffle plate 401. The back of the baffle plate 401 is fixedly connected to the surface of the fixed shaft 206. The front of the baffle plate 401 is connected to the pressing block 403 via a third spring 402. The pressing block 403 passes through a through hole opened in the front wall of the main housing 1.

[0035] When in use, by pressing the pressing block 403 inward and compressing the third spring 402, the pressing block 403 retracts from the through hole on the wall into the inner cavity of the main unit housing 1, and then the outside air enters the inner cavity of the main unit housing 1, keeping the internal and external air pressure equal, thus making it easy to open the flip cover 3.

[0036] Implementation steps and methods of this invention: S1. The temperature detection module 901 detects the line temperature, while the current detection module 902 detects the current magnitude. Then, the segment timing module 1001 receives the temperature and current information and divides them into multiple time segments, forming the temperature and current increase and decrease trends. The fault analysis module 1002 receives the temperature and current changes within this segment and compares them with the highest temperature and current threshold set in the current threshold module 1003 to make a judgment and output two judgment results. S2. When the temperature and current increase rapidly within a certain period of time and reach the set threshold, the first control module 11 receives the judgment result output by the fault analysis module 1002 and forms a control command to be sent to the telescopic mechanism 8. S3. When the temperature and current increase trend amplitude rapidly slows down within a certain period of time and reaches the set threshold, the first control module 11 receives the judgment result output from the fault analysis module 1002 and forms a control command to be sent to the early warning processing mechanism 12. S4. After receiving the control command from the first control module 11, the early warning module 1201 issues an alarm. Then, the response duration module 1202 receives the output signal from the early warning module 1201, measures the response duration, and sends it to the duration comparison module 1203. The duration comparison module 1203 then compares the received alarm response duration information with the response threshold set by the response threshold module 1204. If the overloaded electrical appliance is unplugged when the early warning module 1201 issues the alarm, the early warning module 1201 stops responding. Otherwise, if the overloaded electrical appliance is not removed, the duration comparison module outputs the excessively long response time information to the first control module 11. Then, the first control module 11 generates a control command and sends it to the telescopic mechanism 8. S5. After receiving the control command, the negative pressure component 7 draws suction into the closed inner cavity of the main unit housing 1, thereby creating a negative pressure in the inner cavity of the main unit housing 1. As a result, the movable rod 804, which is movably inserted into the inner cavity of the telescopic tube 802, moves downward under the influence of the internal and external pressure difference. The movable rod 804 then presses down on the head of the central lever 201, causing the central lever 201 to rotate downward along the fixed shaft 206 and press down on the head of the rear conductive rod 207. This causes the head of the rear conductive rod 207 to gradually move away from the bottom of the front conductive rod 208. At this time, the second spring 204 connected to the top of the central lever 201 contracts, while the first spring 202 connected to the bottom of the central lever 201 stretches. As a result, the torsion lever 205 rotates downward under the action of the forward torque force, triggering a trip.

Claims

1. A molded case circuit breaker, comprising a main housing (1) and a disconnect switch (2) installed inside the main housing (1), characterized in that: A negative pressure assembly (7) is installed on one side of the top of the main housing (1), a telescopic mechanism (8) is installed on the top of the inner cavity of the main housing (1), and a vent valve (4) connected to the disconnect switch (2) is also installed in the inner cavity of the main housing (1). The internal structure of the main unit housing (1) also includes a data acquisition mechanism (9), a data processing mechanism (10), a first control module (11), an early warning processing mechanism (12), and a second control module (13); wherein, The data acquisition mechanism (9) includes a temperature detection module (901) and a current detection module (902), wherein the temperature detection module (901) is used to detect the line temperature and generate temperature value information, and the current detection module (902) is used to detect the line current and generate current value information. The data processing mechanism (10) includes a segment timing module (1001), a fault analysis module (1002), and a current threshold module (1003). The segment timing module (1001) divides and records the temperature and current values ​​received within a segment time and forms a trend curve. The fault analysis module (1002) receives the temperature and current changes within the segment time and compares them with the highest temperature and current threshold set in the current threshold module (1003) to make a judgment. The first control module (11) is used to receive the two judgment results output by the fault analysis module (1002) and form corresponding control commands to act on and control the negative pressure component (7) and the early warning processing mechanism (12). The early warning processing mechanism (12) includes an early warning module (1201), a response duration module (1202), and a duration comparison module (1203). The early warning module (1201) is used to receive control commands from the first control module (11) and issue a response alarm. The response duration module (1202) is used to receive response information from the early warning module (1201) and record the response duration. The duration comparison module (1203) compares the received alarm response duration information with the response threshold set by the response threshold module (1204). The second control module (13) is used to receive the judgment result output by the time comparison module (1203) and form a corresponding control command, thereby acting on and controlling the negative pressure component (7). After the data information is collected by the data acquisition mechanism (9), it is sent to the data processing mechanism (10). After the data is analyzed and processed by the data processing mechanism (10), the output value is sent to the first control module (11) and two different control commands are generated. These commands are then output to the negative pressure component (7) and the early warning processing mechanism (12) respectively, and the specific control methods are as follows: The temperature detection module (901) detects the line temperature, while the current detection module (902) detects the current magnitude. Then, the segment timing module (1001) receives the temperature and current information and divides them into multiple time segments to form the temperature and current increase and decrease trends. The fault analysis module (1002) receives the temperature and current changes within the segment and compares them with the highest temperature and current threshold set in the current threshold module (1003) to make a judgment and output two judgment results. When the temperature and current increase rapidly within a certain period of time and reach the set threshold, the first control module (11) receives the judgment result output by the fault analysis module (1002) and forms a control command to be sent to the telescopic mechanism (8). When the temperature and current increase trend rapidly and slowly within a certain period of time reaches the set threshold, the first control module (11) receives the judgment result output by the fault analysis module (1002) and forms a control command to be sent to the early warning processing mechanism (12).

2. A molded case circuit breaker according to claim 1, characterized in that: The early warning processing mechanism (12) receives another output control command signal from the first control module (11). After secondary analysis and processing by the early warning processing mechanism (12), the result information is transmitted to the second control module (13). Then, the second control module (13) transmits the received information to the negative pressure component (7) again to control the negative pressure component (7). The specific control method is as follows: After receiving the control command from the first control module (11) through the early warning module (1201), an alarm is issued. Then, the response duration module (1202) receives the output signal from the early warning module (1201), measures the response duration, and sends it to the duration comparison module (1203). Then, the duration comparison module (1203) compares the received alarm response duration information with the response threshold set by the response threshold module (1204). If the overloaded electrical appliance is unplugged when the early warning module (1201) issues a response alarm, the early warning module (1201) stops responding. Otherwise, if the overloaded electrical appliance is not removed, the duration comparison module outputs the excessively long response time information to the first control module (11). Then, the first control module (11) generates a control command and sends it to the telescopic mechanism (8).

3. A molded case circuit breaker according to claim 1, characterized in that: The disconnect switch (2) includes a central lever (201). The bottom end of the tail of the central lever (201) is connected to the head of the rear conductive rod (207) via a first spring (202). The top end of the tail of the central lever (201) is connected to the torsion lever (205) via a rectangular lever (203). The bottom end of the rectangular lever (203) is fixedly connected to one end of a second spring (204). The top end of the second spring (204), the axis of the torsion lever (205), the center of gravity of the central lever (201), and the middle part of the rear conductive rod (207) are all installed in the inner cavity of the main housing (1) via a fixed shaft (206) and are all movably connected to the fixed shaft (206).

4. A molded case circuit breaker according to claim 3, characterized in that: The bottom end of the rear conductive rod (207) is fixedly connected to the rear conductive block (5) installed at the bottom of the main unit housing (1), the top end of the rear conductive rod (207) touches the bottom end of the front conductive rod (208), and the top end of the front conductive rod (208) is fixedly sleeved with the front conductive block (6) installed at the top of the main unit housing (1).

5. A molded case circuit breaker according to claim 1, characterized in that: The front wall of the main housing (1) has an opening for rotating the pressure handle connected to the side of the torsion lever (205). The top of the opening is movably connected to a flap (3) via a hinge, and the flap (3) seals the opening when closed.

6. A molded case circuit breaker according to claim 1, characterized in that: The telescopic mechanism (8) includes a buffer cylinder (801) and a telescopic tube (802) fixedly connected to its bottom. The telescopic tube (802) is movably sleeved inside a movable rod (804) and a piston plate (803) fixedly connected to the top of the movable rod (804).

7. A molded case circuit breaker according to claim 6, characterized in that: The cross-sectional diameter of the movable rod (804) is smaller than that of the piston plate (803). The cross-section of the piston plate (803) is adapted to the cross-sectional diameter of the inner cavity of the telescopic tube (802). A through cavity is provided at the connection between the buffer cylinder (801) and the telescopic tube (802), and the inner cavity of the buffer cylinder (801) is filled with SF6 gas.

8. A molded case circuit breaker according to claim 1, characterized in that: The vent valve (4) includes a wind deflector (401). The back of the wind deflector (401) is fixedly connected to the surface of the fixed shaft (206). The front of the wind deflector (401) is connected to the pressing block (403) via a third spring (402). The pressing block (403) passes through a through hole in the front wall of the main housing (1).

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