Molded case circuit breaker
By integrating the controller module and the thermal magnetic release device in the plastic case circuit breaker, the problem of high-precision electronic protection and thermal magnetic protection cannot be achieved simultaneously in the prior art, and the dual protection effect of compact structure, small size and high reliability is achieved.
Patent Information
- Application Number
- CN202422514358.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-17
AI Technical Summary
Existing plastic case circuit breakers cannot achieve high-precision electronic protection and thermal magnetic protection functions at the same time, and their volume is limited.
The controller module and the thermal magnetic tripper are integrated in the plastic case circuit breaker. The current signal is detected by the transformer. The controller module realizes main protection. The thermal components and bimetallic sheets combine to achieve backup protection, ensuring that the electronic components can still trip effectively when the electronic components fail.
It realizes dual protection with compact structure, small size and high reliability, with high precision electronic protection and thermal magnetic protection to ensure the safety of electricity use.
Smart Images
Figure CN223155957U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of low-voltage electrical appliance manufacturing, and particularly relates to a molded case circuit breaker. Background Art
[0002] A circuit breaker is an electrical product that can automatically cut off the power supply for protection under overload and short-circuit conditions. The molded case circuit breakers on the market can be divided into thermal-magnetic molded case circuit breakers and electronic molded case circuit breakers. The overload protection function of the thermal-magnetic molded case circuit breaker mainly relies on the heat generated by the thermal element to bend the bimetal sheet to push the mechanism to trip; the short-circuit protection function relies on the electromagnetic force generated by the short-circuit current to push the mechanism to trip. The thermal-magnetic protection is reliable, but the accuracy is relatively low. The protection functions of the electronic molded case circuit breaker all rely on the current transformer to detect the current and give it to the controller, and the controller judges and controls the circuit breaker to trip. The electronic protection has high accuracy, but the electronic components are prone to aging and failure. Due to volume limitations of the existing molded case circuit breakers on the market, it is impossible to integrate the thermal-magnetic protection function and the electronic protection function to achieve dual protection. Content of the Utility Model
[0003] (1) Technical Problems to be Solved
[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a molded case circuit breaker that has both electronic protection function and thermal-magnetic protection function.
[0005] (2) Technical Solutions
[0006] To achieve the above purpose, the utility model is realized through the following technical solutions: A molded case circuit breaker includes a base and an upper cover. The upper cover is installed on the base. An operating member is provided between the base and the upper cover. A moving contact assembly is provided in the base below the operating member. A thermal-magnetic release assembly is provided in the base on one side of the moving contact assembly. A current transformer is provided in the base on one side of the thermal-magnetic release assembly. A wiring row capable of being connected to the thermal-magnetic release assembly is provided in the base and the wiring row penetrates through the current transformer. A controller module connected to the operating member is provided in the upper cover and the controller module is located above the current transformer;
[0007] A trip trigger rod is provided in the operating member. The trip trigger rod is located on one side of the operating member and can perform a trip operation;
[0008] The moving contact assembly includes a contact support. The contact support is installed on the base. A moving contact connected to the contact support is provided on the contact support. A spring piece is provided outside the contact support;
[0009] The thermal-magnetic release component includes a thermal element, in which a bimetal sheet connected to the thermal element is provided. An adjusting screw connected to the bimetal sheet is provided in the bimetal sheet, and the adjusting screw is close to the trip trigger rod. A core connected to the thermal element is provided in the thermal element. An armature connected to the core and capable of elastically rotating is provided on the core. A striking rod capable of approaching the trip trigger rod is provided on the armature.
[0010] Further, a moving contact hinged to the contact support is provided on the contact support, and the cross-sectional shape of the spring piece is in a "U" shape.
[0011] Further, one end of the thermal element is connected to the contact support, the other end of the thermal element is connected to the wiring terminal, and the cross-sectional shape of the thermal element is in a "Z" shape.
[0012] Further, the adjusting screw is installed in the bimetal sheet through a nut.
[0013] Further, a first screw capable of locking and fixing the contact support and the thermal element is provided in the base, and a second screw capable of locking and fixing the thermal element and the wiring terminal is provided in the base.
[0014] Further, the contact support is made of copper.
[0015] When an overload occurs in the line or equipment, the current transformer transmits the current signal to the controller module, and the controller module controls the operating member to trip to achieve protection. When the electronic components fail, the thermal element generates heat to bend the bimetal sheet, thereby pushing the trip trigger rod to move, so as to achieve the tripping of the operating member and realize the overload backup protection.
[0016] When a short circuit occurs in the line or equipment, the current transformer transmits the current signal to the controller module, so that the controller module controls the operating member to trip to achieve protection. When the electronic components fail, under the action of the electromagnetic force of the short-circuit current, the armature is driven to rotate, pushing the trip trigger rod to move, so as to achieve the tripping of the operating member and realize the short-circuit backup protection.
[0017] The setting multiples of the thermal-magnetic release are slightly higher than those of the controller module, so the protection is first achieved by the controller module, and the thermal-magnetic release serves as a backup.
[0018] Compared with the prior art, this molded case circuit breaker has the characteristics of compact structure, small volume and high reliability. By integrating structures such as a controller module and a thermal-magnetic release on the circuit breaker, the circuit breaker not only has the characteristic of high protection accuracy, but also can use the thermal-magnetic release for backup protection when the electronic components fail, ensuring the safety of electricity use. Description of the Drawings
[0019] Figure 1 Schematic diagram of the three-dimensional structural decomposition of the present utility model;
[0020] Figure 2 Schematic diagram of the sectional structure of the present utility model;
[0021] Figure 3 Schematic diagram of the decomposition structure of the moving contact assembly of the present utility model;
[0022] Figure 4 Schematic diagram of the decomposition structure of the thermal-magnetic release assembly of the present utility model.
[0023] In the figure: 1. Moving contact assembly; 101. Moving contact; 102. Contact support; 103. Spring piece; 2. Thermal-magnetic release assembly; 201. Thermal element; 202. Bimetal; 203. Iron core; 204. Armature; 205. Adjusting screw; 206. Striking rod; 207. Nut; 3. Current transformer; 4. Controller module; 5. Terminal block; 6. Operating member; 601. Tripping trigger rod; 7. Base; 8. First screw; 9. Second screw; 10. Upper cover. Detailed implementation manners
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.
[0025] Please refer to Figures 1 to 4, the present utility model provides a technical solution: a plastic case circuit breaker, including a base 7 and an upper cover 10. The upper cover 10 is installed on the base 7. An operating member 6 is provided between the base 7 and the upper cover 10. A moving contact assembly 1 is provided in the base 7 below the operating member 6. A thermal-magnetic release assembly 2 is provided in the base 7 on one side of the moving contact assembly 1. An instrument transformer 3 is provided in the base 7 on one side of the thermal-magnetic release assembly 2. A wiring terminal 5 capable of being connected to the thermal-magnetic release assembly 2 is provided in the base 7 and the wiring terminal 5 penetrates through the instrument transformer 3. A controller module 4 connected to the operating member 6 is provided in the upper cover 10 and the controller module 4 is located above the instrument transformer 3; A trip trigger rod 601 is provided in the operating member 6. The trip trigger rod 601 is located on one side of the operating member 6 and can perform a trip operation; The moving contact assembly 1 includes a contact support 102. The material of the contact support 102 is copper. The contact support 102 is installed on the base 7. A first screw 8 capable of locking and fixing the contact support 102 and a thermal element 201 is provided in the base 7. A second screw 9 capable of locking and fixing the thermal element 201 and the wiring terminal 5 is provided in the base 7. A moving contact 101 connected to the contact support 102 is provided on the contact support 102. A moving contact 101 hingedly connected to the contact support 102 is provided on the contact support 102. The cross-sectional shape of the spring piece 103 is in a "U" shape. A spring piece 103 is provided outside the contact support 102; The thermal-magnetic release assembly 2 includes a thermal element 201. A bimetal 202 connected to the thermal element 201 is provided in the thermal element 201. An adjusting screw 205 connected to the bimetal 202 is provided in the bimetal 202 and the adjusting screw 205 is close to the trip trigger rod 601. The adjusting screw 205 is installed in the bimetal 202 through a nut 207. An iron core 203 connected to the thermal element 201 is provided in the thermal element 201. One end of the thermal element 201 is connected to the contact support 102. The other end of the thermal element 201 is connected to the wiring terminal 5. The cross-sectional shape of the thermal element 201 is in a "Z" shape. An armature 204 connected to the iron core 203 and capable of elastically rotating is provided on the iron core 203. A striking rod 206 capable of being close to the trip trigger rod 601 is provided on the armature 204.
[0026] In the description of this specification, terms such as "connection", "installation", "fixation", "setting", etc. are all understood in a broad sense. For example, "connection" can be a fixed connection or indirectly through an intermediate component without affecting the relationship between components and technical effects, or it can be an integral connection or a partial connection. In the case of this example, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model or the utility model can be understood according to specific circumstances.
[0027] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.
Claims
1. A molded case circuit breaker, comprising a base (7) and an upper cover (10), the upper cover (10) being mounted on the base (7), characterized in that: An operating member (6) is provided between the base (7) and the upper cover (10). A moving contact assembly (1) is provided in the base (7) below the operating member (6). A thermal-magnetic release assembly (2) is provided in the base (7) on one side of the moving contact assembly (1). An instrument transformer (3) is provided in the base (7) on one side of the thermal-magnetic release assembly (2). A terminal block (5) capable of being connected to the thermal-magnetic release assembly (2) is provided in the base (7), and the terminal block (5) penetrates through the instrument transformer (3). A controller module (4) connected to the operating member (6) is provided in the upper cover (10), and the controller module (4) is located above the instrument transformer (3). A trip trigger rod (601) is provided in the operating member (6). The trip trigger rod (601) is located on one side of the operating member (6) and can perform a trip operation. The moving contact assembly (1) includes a contact support (102). The contact support (102) is installed on the base (7). A moving contact (101) connected to the contact support (102) is provided on the contact support (102). A spring piece (103) is provided outside the contact support (102). The thermal-magnetic release assembly (2) includes a thermal element (201). A bimetal sheet (202) connected to the thermal element (201) is provided in the thermal element (201). An adjusting screw (205) connected to the bimetal sheet (202) is provided in the bimetal sheet (202), and the adjusting screw (205) is close to the trip trigger rod (601). An iron core (203) connected to the thermal element (201) is provided in the thermal element (201). An armature (204) connected to the iron core (203) and capable of elastically rotating is provided on the iron core (203). A striking rod (206) capable of being close to the trip trigger rod (601) is provided on the armature (204).
2. A molded case circuit breaker according to claim 1, characterized in that: A moving contact (101) hinged to the contact support (102) is provided on the contact support (102). The cross-sectional shape of the spring piece (103) is in a "U" shape.
3. A molded case circuit breaker according to claim 1, characterized in that: One end of the thermal element (201) is connected to the contact support (102), and the other end of the thermal element (201) is connected to the terminal block (5). The cross-sectional shape of the thermal element (201) is in a "Z" shape.
4. A molded case circuit breaker according to claim 1, characterized in that: The adjusting screw (205) is installed in the bimetal sheet (202) through a nut (207).
5. A molded case circuit breaker according to claim 1, characterized in that: A first screw (8) capable of locking and fixing the contact support (102) and the thermal element (201) is provided in the base (7). A second screw (9) capable of locking and fixing the thermal element (201) and the terminal block (5) is provided in the base (7).
6. The molded case circuit breaker according to claim 5, wherein: The material of the contact support (102) is copper.