An electrical leakage circuit breaker

Abstract

The application discloses a leakage circuit breaker and relates to the technical field of electrical equipment.The leakage circuit breaker comprises a cuboid shell and a circuit board arranged in the shell.The circuit board divides the space in the shell into a protection pole chamber and a neutral pole chamber which are arranged side by side along the height direction of the shell.A first operating mechanism, a first moving contact, a first static contact, a short-circuit release and a mutual inductor are sequentially arranged in the protection pole chamber along the length direction.A second operating mechanism, a second moving contact, a second static contact and a leakage release are sequentially arranged in the neutral pole chamber along the length direction.The second operating mechanism corresponds to the first operating mechanism in position.The circuit board is provided with an opening at the position corresponding to the mutual inductor.The first static contact and the second static contact are arranged through the mutual inductor respectively.The mutual inductor is electrically connected with the leakage release.The leakage circuit breaker provided by the application has a compact internal structure and can reduce the overall volume of the leakage circuit breaker.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and more specifically, to a residual current circuit breaker. Background Technology

[0002] A residual current circuit breaker (RCCB) is a switch that automatically trips when the leakage current in a circuit exceeds a predetermined value. It serves as backup protection against faults such as electric shock, fire, and aging wiring. RCCBs are divided into electromagnetic and electronic types. RCCBs utilize a zero-sequence current transformer (ZCT) inside the circuit breaker. Currents from both the protective electrode and the neutral electrode pass through the ZCT simultaneously. By detecting the unbalanced current in the ZCT, leakage protection is achieved. When an electric shock or leakage fault occurs in the circuit, the phasor sum of the currents passing through the ZCT is not zero, thus generating a leakage current. Electromagnetic RCCBs control the circuit breaker to trip based on the leakage current, automatically cutting off the power supply. Electronic RCCBs, on the other hand, control the circuit breaker to trip via a controller based on the leakage current signal, also automatically cutting off the power supply.

[0003] Existing residual current circuit breakers are limited by their internal mechanisms. The housing is usually a U-shaped housing, and the terminals are screw-connected. The U-shaped housing is relatively tall, and the handle has a large range of motion when operating, which makes the overall size of the circuit breaker too large, resulting in an excessively large distribution box. Summary of the Invention

[0004] The purpose of this application is to provide a residual current circuit breaker with a compact internal structure, which can reduce the overall size of the residual current circuit breaker.

[0005] An embodiment of this application provides a residual current circuit breaker, including a cuboid housing and a circuit board disposed within the housing. The circuit board divides the space within the housing into a protective electrode chamber and a neutral electrode chamber arranged side by side along the height direction of the housing. A first operating mechanism, a first moving contact, a first stationary contact, a short-circuit trip unit, and a current transformer are sequentially arranged along the length direction of the protective electrode chamber. The first operating mechanism, when driven, causes the first moving contact to close or open with the first stationary contact. A second operating mechanism, a second moving contact, a second stationary contact, and a residual current trip unit are sequentially arranged along the length direction of the neutral electrode chamber. The second operating mechanism, when driven, causes the second moving contact to close or open with the second stationary contact. The second operating mechanism corresponds in position to the first operating mechanism. An opening is provided on the circuit board at the corresponding position of the current transformer. The first and second stationary contacts pass through the current transformer, and the current transformer is electrically connected to the residual current trip unit.

[0006] As an feasible approach, the protective electrode chamber is further provided with a protective electrode arc-extinguishing chamber, and the neutral electrode chamber is further provided with a neutral electrode arc-extinguishing chamber, with the positions of the neutral electrode arc-extinguishing chamber and the protective electrode arc-extinguishing chamber corresponding.

[0007] As an feasible approach, the neutral polarity arc-extinguishing chamber has the same structure as the protective arc-extinguishing chamber.

[0008] As an implementable approach, the residual current circuit breaker also includes an overload protector disposed between the housing and the first operating mechanism. The overload protector is connected to the first moving contact and is driven to open the first operating mechanism.

[0009] As one feasible approach, the overload protector includes a bimetallic strip, one end of which is fixedly connected to the housing, and the other end is heated and bent toward a first operating mechanism to push the first operating mechanism to open the circuit.

[0010] As an feasible approach, partitions are provided between the circuit board and the first operating mechanism, as well as between the circuit board and the second operating mechanism.

[0011] As an feasible approach, the neutral electrode chamber is also provided with a neutral electrode input terminal and a neutral electrode output terminal located at both ends of the neutral electrode arc-extinguishing chamber, and the protection electrode chamber is also provided with a protection electrode input terminal and a protection electrode output terminal located at both ends of the protection electrode arc-extinguishing chamber.

[0012] As one possible implementation, the first operating mechanism includes a first handle, the second operating mechanism includes a second handle, the first handle and the second handle are located on one side of the housing width direction, and the first handle and the second handle are linked together.

[0013] As one feasible approach, both the first and second handles are boat-shaped handles.

[0014] As an feasible approach, the first operating mechanism also includes a tripping fastener and a locking fastener, which abut against each other. One end of the locking fastener is provided with a short-circuit boss, and the short-circuit trip unit drives the short-circuit boss to move, thereby causing the first operating mechanism to open.

[0015] As an feasible approach, a test button is provided on one side of the second handle on the housing, and an elastic element is provided inside the housing corresponding to the test button. Pressing the test button causes one end of the elastic element to contact the second moving contact when it is in the closed state.

[0016] As an feasible approach, the locking element of the first operating mechanism is also provided with an overload boss. The other end of the bimetallic strip is heated and bent, driving the overload boss to move so that the first operating mechanism can be tripped.

[0017] The beneficial effects of the embodiments of this application include:

[0018] The residual current circuit breaker provided by this invention includes a cuboid housing and a circuit board disposed within the housing. The circuit board divides the space within the housing into a protective electrode chamber and a neutral electrode chamber arranged side by side along the height direction of the housing. The cuboid housing, with the neutral electrode chamber and the protective electrode chamber arranged side by side along the height direction, effectively reduces the width dimension of the residual current circuit breaker. The protective electrode chamber has a first operating mechanism, a first moving contact, a first stationary contact, a short-circuit trip unit, and a current transformer arranged sequentially along its length. The first operating mechanism, when driven, causes the first moving contact to close with the first stationary contact. Alternatively, the neutral electrode chamber can be configured with a second operating mechanism, a second moving contact, a second stationary contact, and a residual current device (RCD) in sequence along its length. The second operating mechanism is driven to close or open the circuit with the second moving contact and the second stationary contact. The second operating mechanism corresponds to the first operating mechanism. The circuit board has an opening at the corresponding position of the current transformer. The first and second stationary contacts pass through the current transformer. The current transformer is electrically connected to the RCD. The arrangement of the components in the neutral electrode chamber and the protective electrode chamber makes the components more compact, thereby reducing the overall size of the residual current circuit breaker. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 One of the schematic diagrams of a residual current circuit breaker provided in this application embodiment;

[0021] Figure 2 This is a second schematic diagram of a residual current circuit breaker provided in an embodiment of this application;

[0022] Figure 3 This is the third schematic diagram of a residual current circuit breaker provided in the embodiments of this application.

[0023] Icons: 100 - Residual Current Circuit Breaker; 110 - Housing; 111 - Circuit Board; 120 - Protective Pole Chamber; 121 - First Operating Mechanism; 1211 - First Handle; 1212 - Trip Clip; 1213 - Locking Clip; 1214 - Short Circuit Boss; 1215 - Overload Boss; 122 - First Moving Contact; 123 - First Stationary Contact; 124 - Short Circuit Trip Unit; 125 - Current Transformer; 126 - Protective Pole Arc Extinguishing Chamber; 1 27-Bimetallic strip; 128-Protection electrode input terminal; 129-Protection electrode output terminal; 130-Neutral electrode chamber; 131-Second operating mechanism; 1311-Second handle; 132-Second moving contact; 133-Second stationary contact; 134-Residual current trip unit; 135-Neutral electrode arc extinguishing chamber; 136-Baffle plate; 137-Neutral electrode input terminal; 138-Neutral electrode output terminal; 140-Test button; 141-Elastic element. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Residual current circuit breakers are usually installed in cabinets. Existing residual current circuit breakers are limited by their internal structure, which is usually a U-shaped housing. The U-shaped housing is relatively wide, making it difficult to adapt to installation and use environments with width requirements.

[0029] This invention provides a residual current circuit breaker 100, such as... Figure 1 , Figure 2 and Figure 3 As shown, the device includes a rectangular housing 110 and a circuit board 111 disposed within the housing 110. The circuit board 111 divides the space within the housing 110 into sections along the height direction of the housing 110 (e.g., ...). Figure 1 The protective electrode chamber 120 and the neutral electrode chamber 130 are arranged side by side in the B direction, and the protective electrode chamber 120 is arranged in the length direction (e.g., in the B direction). Figure 1 In the neutral pole chamber 130 (direction A), a first operating mechanism 121, a first moving contact 122, a first stationary contact 123, a short-circuit trip unit 124, and a current transformer 125 are arranged sequentially. The first operating mechanism 121 is driven to close or open the first moving contact 122 and the first stationary contact 123. In the neutral pole chamber 130 (direction A), a second operating mechanism 131, a second moving contact 132, a second stationary contact 133, and a leakage current trip unit 134 are arranged sequentially. The second operating mechanism 131 is driven to close or open the second moving contact 132 and the second stationary contact 133. The second operating mechanism 131 is positioned corresponding to the first operating mechanism 121. The circuit board 111 has an opening at the corresponding position of the current transformer 125. The first stationary contact 123 and the second stationary contact 133 are respectively arranged through the current transformer 125. The current transformer 125 is electrically connected to the leakage current trip unit 134.

[0030] The input terminal of the residual current circuit breaker 100 is connected to the power supply, and the output terminal of the residual current circuit breaker 100 is connected to the load. When the residual current circuit breaker 100 is closed, the first moving contact 122 is in contact with the first stationary contact 123, and the second moving contact 132 is in contact with the second stationary contact 133. The neutral wire and the live wire of the power supply are connected to the first moving contact 122 and the second moving contact 132 respectively, and the neutral wire and the live wire of the load are connected to the first stationary contact 123 and the second stationary contact 133 respectively, so that the power supply supplies power to the load.

[0031] When the current through the residual current circuit breaker 100 exceeds the set short-circuit operating current, the short-circuit trip unit 124 is activated. The short-circuit trip unit 124 includes a moving iron core, a stationary iron core, and a push rod disposed within the stationary iron core. The moving iron core moves and pushes the push rod to extend. The push rod pushes the first operating mechanism 121. The operation of the first operating mechanism 121 causes the first moving contact 122 to move, causing the first moving contact 122 to separate from the first stationary contact 123, thereby breaking the circuit and realizing the short-circuit protection function of the residual current circuit breaker 100.

[0032] When the residual current circuit breaker 100 is working normally, the current in the neutral wire and the current in the live wire are equal in value but opposite in direction, making the current in the first stationary contact 123 and the second stationary contact 133 equal in value but opposite in direction, and the sum of the currents passing through the current transformer 125 is zero. When a leakage current occurs in the circuit, the current flowing through the first stationary contact 123 is different from the current flowing through the second stationary contact 133. The current transformer 125 senses the leakage current signal and transmits the leakage current signal to the circuit board 111. The circuit board 111 controls the residual current trip unit 134 to operate and pushes the second operating mechanism 131. The second operating mechanism 131 operates to cause the second stationary contact 133 to separate from the second moving contact 132, thereby breaking the circuit and realizing the leakage protection function of the residual current circuit breaker 100.

[0033] The present invention sequentially arranges the first operating mechanism 121, the first moving contact 122, the first stationary contact 123, the short-circuit trip unit 124 and the current transformer 125 in the protection electrode chamber 120, and sequentially arranges the second operating mechanism 131, the second moving contact 132, the second stationary contact 133 and the leakage current trip unit 134 in the neutral electrode chamber 130, so that the leakage current circuit breaker 100 has a compact structure.

[0034] The residual current circuit breaker 100 provided by the present invention includes a cuboid housing 110 and a circuit board 111 disposed within the housing 110. The circuit board 111 divides the space within the housing 110 into a protective electrode chamber 120 and a neutral electrode chamber 130 arranged side by side along the height direction of the housing 110. The housing 110 is set as a cuboid, and the neutral electrode chamber 130 and the protective electrode chamber 120 are arranged side by side along the height direction, which effectively reduces the width dimension of the residual current circuit breaker 100. The position arrangement of each component in the neutral electrode chamber 130 and the protective electrode chamber 120 makes each component more compact, thereby reducing the overall volume of the residual current circuit breaker 100.

[0035] Optional, such as Figure 2 , Figure 3 As shown, the protective electrode chamber 120 is also provided with a protective electrode arc-extinguishing chamber 126, and the neutral electrode chamber 130 is also provided with a neutral electrode arc-extinguishing chamber 135. The positions of the neutral electrode arc-extinguishing chamber 135 and the protective electrode arc-extinguishing chamber 126 correspond.

[0036] When the first stationary contact 123 separates from the first moving contact 122, and when the second stationary contact 133 separates from the second moving contact 132, an electric arc will be generated. An arc-extinguishing chamber is required to extinguish the generated arc. A protective arc-extinguishing chamber 126 is provided in the protective electrode chamber 120 to extinguish the arc generated when the first stationary contact 123 and the first moving contact 122 separate. A neutral arc-extinguishing chamber 135 is provided in the neutral electrode chamber 130 to extinguish the arc generated when the second stationary contact 133 and the second moving contact 132 separate.

[0037] like Figure 2 As shown, the protective arc-extinguishing chamber 126 is located on one side of the short-circuit trip unit 124 along its width direction, as... Figure 3 As shown, the neutral arc-extinguishing chamber 135 is located on one side of the residual current trip unit 134 along the width direction, making the overall structure of the residual current circuit breaker 100 compact.

[0038] It should be noted that, in order to guide the generated arc to the arc-extinguishing chamber, a first arc-initiating plate is provided below the protective electrode arc-extinguishing chamber 126, with one end of the first arc-initiating plate extending below the first moving contact 122; similarly, a second arc-initiating plate is provided below the neutral electrode arc-extinguishing chamber 135, with one end of the second arc-initiating plate extending below the second moving contact 132.

[0039] In one possible implementation of this invention, such as Figure 2 , Figure 3 As shown, the neutral electrode arc-extinguishing chamber 135 has the same structure as the protective electrode arc-extinguishing chamber 126.

[0040] Compared to the existing technology where the current transformer 125 is placed inside the neutral pole chamber 130, thus reducing the size of the neutral pole arc-extinguishing chamber 135, the present invention places the current transformer 125 at one end of the protective pole chamber 120. This allows the neutral pole arc-extinguishing chamber 135 and the protective pole arc-extinguishing chamber 126 to be of the same size and have the same internal structure, thereby improving the arc-extinguishing capability of the neutral pole arc-extinguishing chamber 135 and the breaking capacity of the residual current circuit breaker 100.

[0041] Optional, such as Figure 2 As shown, the residual current circuit breaker 100 also includes an overload protector disposed between the housing 110 and the first operating mechanism 121. The overload protector is connected to the first moving contact 122 and is driven to open the first operating mechanism 121.

[0042] When the residual current circuit breaker 100 is closed, the first moving contact 122 contacts the first stationary contact 123, and current flows through the first moving contact 122 and the first stationary contact 123. The overload protector is connected to the first moving contact 122. When the current in the first moving contact 122 exceeds the rated current, the current in the overload protector also exceeds the rated current. When the current in the overload protector exceeds the rated current, it changes and drives the first operating mechanism 121 to operate, causing the first operating mechanism 121 to open.

[0043] The overload protector enables the residual current circuit breaker 100 to automatically trip when the current exceeds a certain value, thus achieving overcurrent protection for the circuit. Moreover, by placing the overload protector between the housing 110 and the first operating mechanism 121, the internal structure of the residual current circuit breaker 100 is made compact without affecting the overcurrent protection function.

[0044] In one possible implementation of this invention, such as Figure 2 As shown, the overload protector includes a bimetallic strip 127. One end of the bimetallic strip 127 is fixedly connected to the housing 110, and the other end is bent towards the first operating mechanism 121 when heated, so as to push the first operating mechanism 121 to open the circuit.

[0045] The bimetallic strip 127 is a composite material composed of two or more metals or other materials with suitable properties. When the current in the residual current circuit breaker 100 exceeds the rated current, the current flowing through the bimetallic strip 127 is relatively large, generating heat. When the heat on the bimetallic strip 127 accumulates and the temperature on the bimetallic strip exceeds the predetermined temperature, due to the different thermal expansion coefficients of the various elements in the bimetallic strip 127, the bimetallic strip 127 exceeding the predetermined temperature bends, pushing the first operating mechanism 121 to open the circuit, thereby causing the first stationary contact 123 to separate from the first moving contact 122, realizing the overload protection function of the circuit.

[0046] One end of the bimetallic strip 127 is fixed to the housing 110, and the other end is positioned near the first operating mechanism 121 as a driving end, so that the driving end deforms to drive the first operating mechanism 121 to move. When the bimetallic strip 127 is fixed to the housing 110, it can be fixed to the first arc-starting plate and then to the housing 110.

[0047] Optional, such as Figure 3 As shown, a partition 136 is provided between the circuit board 111 and the second operating mechanism 131, and between the circuit board 111 and the first operating mechanism 121.

[0048] Circuit board 111 is used for control and signal transmission. The current flowing inside is low voltage. The second operating mechanism 131 is connected to the second moving contact 132. When the residual current circuit breaker 100 is closed and the second moving contact 132 contacts the second stationary contact 133, the current flowing inside the second moving contact 132 is electrical power, which is high voltage. High voltage has a higher voltage resistance than low voltage. When high voltage and low voltage are close to each other, electrical breakdown may occur, causing circuit board 111 to burn out. In order to increase the voltage resistance between high voltage and low voltage, partitions 136 are provided between circuit board 111 and the second operating mechanism 131, and between circuit board 111 and the first operating mechanism 121 to electrically isolate high voltage and low voltage. To achieve electrical isolation, partitions 136 need to be made of insulating material.

[0049] It should be noted that the first operating mechanism 121 is driven to connect with the first moving contact 122. When the leakage circuit breaker 100 is closed, the first moving contact 122 contacts the first stationary contact 123, and a strong current flows between the first moving contact 122 and the first stationary contact 123. Therefore, the partition 136 extends to the position corresponding to the first stationary contact 123. Similarly, the partition 136 provided on the other side of the circuit board 111 also extends to the position corresponding to the second stationary contact 133.

[0050] In one possible implementation of this invention, such as Figure 2 , Figure 3 As shown, the neutral electrode chamber 130 is also provided with a neutral electrode input terminal 137 and a neutral electrode output terminal 138 located at both ends of the neutral electrode arc-extinguishing chamber 135, and the protective electrode chamber 120 is also provided with a protective electrode input terminal 128 and a protective electrode output terminal 129 located at both ends of the protective electrode arc-extinguishing chamber 126.

[0051] The neutral electrode input terminal 137 and the neutral electrode output terminal 138 are located at both ends of the neutral electrode arc-extinguishing chamber 135, and the neutral electrode arc-extinguishing chamber 135 is located at one end of the neutral electrode chamber 130 in the width direction, as shown below. Figure 3 As shown, located below the leakage current trip unit 134, the internal space of the neutral electrode chamber 130 can be fully utilized, making the structure inside the neutral electrode chamber 130 compact. Similarly, the protection electrode input terminal 128 and the protection electrode output terminal 129 are set at both ends of the protection electrode arc extinguishing chamber 126, and the protection electrode arc extinguishing chamber 126 is located at one end of the width direction of the protection electrode chamber 120, below the short circuit trip unit 124, which can make full use of the internal space of the protection electrode chamber 120, making the structure inside the protection electrode chamber 120 compact.

[0052] The protection electrode input terminal 128 and the neutral electrode input terminal 137 are used for connecting to an external power supply, and the protection electrode output terminal 129 and the neutral electrode output terminal 138 are used for connecting to a load. The specific form of the input and output terminals is not specifically limited in this invention, as long as they can achieve the function of connecting to a power supply or a load. For example, this invention uses a plug-in plate with two elastic arms. The two elastic arms have elastic potential energy that brings them close to each other, and the elastic potential energy clamps the wire after the wire is inserted.

[0053] It should be noted that, corresponding to the neutral input terminal 137 and the neutral output terminal 138, the protection input terminal 128 and the protection output terminal 129, the housing 110 has through holes so that the wires can pass through the through holes and connect to the corresponding terminals.

[0054] Optional, such as Figure 2 , Figure 3As shown, the first operating mechanism 121 includes a first handle 1211, and the second operating mechanism 131 includes a second handle 1311. The first handle 1211 and the second handle 1311 are located on one side of the width direction of the housing 110, and the first handle 1211 and the second handle 1311 are linked together.

[0055] The first handle 1211 and the second handle 1311 are located on one side of the housing 110 in the width direction, reducing the width occupied by the handles and thus enabling the residual current circuit breaker 100 to adapt to installation and use environments with width requirements. When the residual current circuit breaker 100 trips, the first stationary contact 123 and the first moving contact 122, and the second stationary contact 133 and the second moving contact 132 need to trip simultaneously, linking the first handle 1211 and the second handle 1311 together, so that the circuit in the neutral electrode chamber 130 and the circuit in the protective electrode chamber 120 operate synchronously.

[0056] In one possible implementation of this invention, such as Figure 2 , Figure 3 As shown, both the first handle 1211 and the second handle 1311 are boat-shaped handles. Boat-shaped handles occupy less space and are easier to operate as the operator's control end.

[0057] Optional, such as Figure 2 As shown, the first operating mechanism 121 also includes a trip fastener 1212 and a locking fastener 1213. The locking fastener 1213 and the trip fastener 1212 abut against each other. One end of the locking fastener 1213 is provided with a short-circuit boss 1214. The short-circuit trip unit 124 drives the short-circuit boss 1214 to move, causing the first operating mechanism 121 to trip.

[0058] The short-circuit boss 1214 corresponds to the short-circuit trip unit 124. When the short-circuit trip unit 124 receives a short-circuit signal and trips, it pushes the locking member 1213, causing it to separate from the tripping member 1212. This causes the first moving contact 122 to move away from the first stationary contact 123, thus tripping the residual current circuit breaker 100. The short-circuit boss 1214 makes it easier for the short-circuit trip unit 124 to move the locking member 1213.

[0059] In one possible implementation of this invention, such as Figure 3 As shown, a test button 140 is also provided on one side of the second handle 1311 on the housing 110, and an elastic element 141 is also provided inside the housing 110 corresponding to the test button 140. Pressing the test button 140 causes one end of the elastic element 141 to contact the second moving contact 132 when it is in the closed state.

[0060] In practical applications, it is necessary to test at intervals whether the residual current circuit breaker 100 can automatically disconnect in the event of a leakage current to protect the load and circuit. A test button 140 is provided on one side of the second handle 1311 on the housing 110. When the residual current circuit breaker 100 is closed, pressing the test button 140 causes one end of the elastic element 141 to contact the second moving contact 132, and the other end of the elastic element 141 to connect to the protective electrode output terminal 129. This causes some current to not pass through the current transformer 125, resulting in a non-zero current sum in the current transformer 125, thus generating a leakage current signal. Pressing the test button 140 artificially creates a leakage current signal to detect whether the leakage protection function of the residual current circuit breaker 100 is normal, ensuring that the residual current circuit breaker 100 can automatically trip in the event of a leakage current in the circuit to achieve the leakage current protection function.

[0061] Optional, such as Figure 2 As shown, the locking member 1213 of the first operating mechanism 121 is also provided with an overload boss 1215. The other end of the bimetallic strip 127 is heated and bent to drive the overload boss 1215 to move so that the first operating mechanism 121 is disconnected.

[0062] After the bimetallic strip 127 is heated and bent, it pushes the first operating mechanism 121. The overload boss 1215 on the locking member 1213 is used to contact the other end of the bimetallic strip 127. The overload boss 1215 makes it easier for the other end of the bimetallic strip 127 to push the movement of the locking member 1213.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A residual current circuit breaker (100), characterized in that, The device includes a rectangular housing (110) and a circuit board (111) disposed within the housing (110). The circuit board (111) divides the space within the housing (110) into a protection electrode chamber (120) and a neutral electrode chamber (130) arranged side by side along the height direction of the housing (110). The protection electrode chamber (120) is sequentially provided with a first operating mechanism (121), a first moving contact (122), a first stationary contact (123), a short-circuit trip unit (124), and a current transformer (125) along its length. The first operating mechanism (121) is driven to close or open the first moving contact (122) and the first stationary contact (123). The neutral electrode chamber (120)... 130) A second operating mechanism (131), a second moving contact (132), a second stationary contact (133), and a leakage current trip unit (134) are arranged sequentially along the length direction. The second operating mechanism (131) is driven to make the second moving contact (132) and the second stationary contact (133) close or open. The second operating mechanism (131) corresponds to the position of the first operating mechanism (121). The circuit board (111) has an opening at the corresponding position of the current transformer (125). The first stationary contact (123) and the second stationary contact (133) pass through the current transformer (125) respectively. The current transformer (125) is connected to the leakage current trip unit (134). The neutral electrode chamber is further provided with a neutral electrode input terminal and a neutral electrode output terminal, which are located at opposite ends of the length direction and are positioned opposite to the second handle of the second operating mechanism along the width direction; the protective electrode chamber is further provided with a protective electrode input terminal and a protective electrode output terminal, which are located at opposite ends of the length direction and are positioned opposite to the first handle of the first operating mechanism along the width direction.

2. The residual current circuit breaker (100) according to claim 1, characterized in that, The protective electrode chamber (120) is further provided with a protective electrode arc extinguishing chamber (126), and the neutral electrode chamber (130) is further provided with a neutral electrode arc extinguishing chamber (135) corresponding to the position of the protective electrode arc extinguishing chamber (126).

3. The residual current circuit breaker (100) according to claim 2, characterized in that, The protective electrode arc-extinguishing chamber (126) has the same structure as the neutral electrode arc-extinguishing chamber (135).

4. The residual current circuit breaker (100) according to claim 1, characterized in that, It also includes an overload protector disposed between the housing (110) and the first operating mechanism (121), the overload protector being connected to the first moving contact (122), the overload protector being driven to open the first operating mechanism (121).

5. The residual current circuit breaker (100) according to claim 4, characterized in that, The overload protector includes a bimetallic strip (127), one end of which is fixed to the housing (110), and the other end is heated and bent toward the first operating mechanism (121) to push the first operating mechanism (121) to open the circuit.

6. The residual current circuit breaker (100) according to claim 1, characterized in that, A partition (136) is provided between the circuit board (111) and the first operating mechanism (121) and between the circuit board (111) and the second operating mechanism (131).

7. The residual current circuit breaker (100) according to claim 2, characterized in that, The neutral electrode chamber (130) is further provided with a neutral electrode input terminal (137) and a neutral electrode output terminal (138) located at both ends of the neutral electrode arc-extinguishing chamber (135), and the protective electrode chamber (120) is further provided with a protective electrode input terminal (128) and a protective electrode output terminal (129) located at both ends of the protective electrode arc-extinguishing chamber (126).

8. The residual current circuit breaker (100) according to claim 1, characterized in that, The first operating mechanism (121) includes a first handle (1211), and the second operating mechanism (131) includes a second handle (1311). The first handle (1211) and the second handle (1311) are located on one side of the width direction of the housing (110), and the first handle (1211) and the second handle (1311) are linked together.

9. The residual current circuit breaker (100) according to claim 8, characterized in that, Both the first handle (1211) and the second handle (1311) are boat-shaped handles.

10. The residual current circuit breaker (100) according to claim 1, characterized in that, The first operating mechanism (121) further includes a trip fastener (1212) and a locking fastener (1213). The locking fastener (1213) and the trip fastener (1212) abut against each other. One end of the locking fastener (1213) is provided with a short-circuit boss (1214). The short-circuit trip unit (124) drives the short-circuit boss (1214) to move, causing the first operating mechanism (121) to open.

11. The residual current circuit breaker (100) according to claim 8, characterized in that, A test button (140) is provided on one side of the second handle (1311) on the housing (110). An elastic element (141) is also provided inside the housing (110) corresponding to the test button (140). Pressing the test button (140) causes one end of the elastic element (141) to contact the second moving contact (132) when it is in the closed state.

12. The residual current circuit breaker (100) according to claim 5, characterized in that, The locking member (1213) of the first operating mechanism (121) is also provided with an overload boss (1215). The other end of the bimetallic strip (127) is heated and bent to drive the overload boss (1215) to move so that the first operating mechanism (121) is disconnected.

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