A miniature residual current circuit breaker

Abstract

This utility model discloses a miniature residual current circuit breaker, including a circuit breaker body and a circuit board disposed inside the circuit breaker body. The circuit breaker body includes a first pole and a second pole. The first pole is equipped with an electromagnetic trip unit, a thermal element, and a current transformer. The second pole is fixedly connected to a lever, and a moving contact located above the lever is disposed inside the second pole. This utility model, by incorporating an electromagnetic trip unit, a thermal element, and a current transformer inside the first pole, provides circuit protection, overload protection, and leakage current detection. Without changing the size of the circuit breaker, the addition of a lever and a microswitch makes full use of the circuit breaker space and allows for reasonable arrangement, realizing a miniature residual current circuit breaker that can be connected to both the top and bottom of the circuit. It has advantages such as low cost and convenient installation.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, specifically a small residual current circuit breaker. Background Technology

[0002] Currently in my country, the most widely used type of electric shock protection device is the electronic residual current circuit breaker (RCCB). Because the trip coil of an electronic RCCB is only momentarily energized when it receives an operating signal, and immediately de-energized after the RCCB disconnects the circuit, if the top and bottom input lines of the RCCB are reversed, the voltage will remain applied to the trip coil after the RCCB trips. This will burn out the coil and cause the entire RCCB to lose its residual current protection function.

[0003] Currently, the most common traditional wiring method is the top-entry method, where the cable enters from the top of the circuit breaker and exits from the bottom. In power distribution, the cable needs to make a large bend at the top, which wastes materials, increases construction difficulty and production costs, and is inconvenient for installation and maintenance. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a miniature residual current circuit breaker.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a miniature residual current circuit breaker, comprising a circuit breaker body and a circuit board disposed inside the circuit breaker body. The circuit breaker body includes a first pole and a second pole. The first pole contains an electromagnetic trip unit, a thermal element, and a current transformer. The second pole has a lever fixedly connected inside, a moving contact located above the lever, and a micro switch located below the lever. A torsion spring providing a reset force to the lever is also located inside the second pole. The top of the lever has an upper protruding contact that abuts against the moving contact, and the bottom of the lever has a lower protruding contact. The micro switch has a spring plate that abuts against the lower protruding contact, and an operating button located below the spring plate. The bottom of the micro switch has a common point and a normally open / closed point.

[0007] As a preferred embodiment of this utility model, the interior of the second pole is provided with a first groove for fixing the lever, and the middle part of the first groove is provided with a stepped protrusion.

[0008] As a preferred technical solution of this utility model, the bottom of the lever is provided with a stepped groove that is gap-fitted with the stepped protrusion.

[0009] As a preferred embodiment of this utility model, the bottom edge of the lever is provided with a boss.

[0010] As a preferred embodiment of the present invention, the bottom of the torsion spring has a first support arm that abuts against the notch edge of the first groove, and the top of the torsion spring has a second support arm that abuts against the boss.

[0011] As a preferred embodiment of this utility model, the two common points of the micro switch are connected to the lower ends of the first and second poles respectively via wires, and the two normally open and closed points of the micro switch are connected to the circuit board via wires.

[0012] As a preferred embodiment of the present invention, the interior of the second electrode is provided with a second groove for fixing the micro switch.

[0013] The beneficial effects of this utility model are:

[0014] This type of miniature residual current circuit breaker (RCCB) incorporates an electromagnetic trip unit, a thermal element, and a current transformer inside its first pole. The electromagnetic trip unit provides circuit protection, the thermal element provides overload protection, and the current transformer detects leakage current. Without altering the circuit breaker's size, the addition of a lever and microswitch maximizes space utilization and allows for efficient arrangement, resulting in a miniature RCCB that can accommodate both top and bottom wiring. It offers advantages such as low cost and easy installation. The lever... When the circuit breaker is in the open position, the lever rotates to the right under the action of the torsion spring, so that the upper convex contact of the lever contacts the moving contact of the second pole, and the lower convex contact contacts the spring plate of the micro switch, pressing the spring plate downward and pressing the operating button of the micro switch, so that the normally closed contact of the micro switch becomes the normally open contact; during the circuit breaker closing process, the upper convex contact of the lever overcomes the torsion force of the torsion spring under the rotation of the moving contact, so that the lower convex contact separates from the spring plate of the micro switch, the operating button of the micro switch pops up, and the contact of the micro switch becomes the normally closed contact. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a structural schematic diagram of a small residual current circuit breaker according to this utility model;

[0017] Figure 2 This is a schematic diagram of the first pole structure of a small residual current circuit breaker according to this utility model;

[0018] Figure 3 This is a schematic diagram of the second pole structure of a small residual current circuit breaker according to this utility model;

[0019] Figure 4This is a schematic diagram of the connection structure between the second pole of a small residual current circuit breaker, the lever, and the micro switch according to this utility model.

[0020] Figure 5 This is a schematic diagram of the lever structure of a small residual current circuit breaker according to this utility model;

[0021] Figure 6 This is a schematic diagram of the micro switch structure of a small residual current circuit breaker according to this utility model;

[0022] Figure 7 This is a schematic diagram of the torsion spring structure of a small residual current circuit breaker according to this utility model.

[0023] In the diagram: 1. Circuit breaker body; 2. First pole; 3. Second pole; 4. Electromagnetic trip unit; 5. Thermal element; 6. Current transformer; 7. Lever; 701. Upper convex contact; 702. Lower convex contact; 703. Boss; 8. Moving contact; 9. Micro switch; 901. Spring plate; 902. Operating button; 903. Common point; 904. Normally open / closed contact; 10. Torsion spring; 1001. First support arm; 1002. Second support arm; 11. First groove; 12. Stepped protrusion; 13. Stepped groove; 14. Second groove. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, this utility model discloses a miniature residual current circuit breaker, comprising a circuit breaker body 1 and a circuit board disposed inside the circuit breaker body 1. The circuit breaker body 1 includes a first pole 2 and a second pole 3. The first pole 2 is internally provided with an electromagnetic trip unit 4, a thermal element 5, and a current transformer 6. The output terminal of the first pole 2 is connected to the coil via a wire, which passes through a square hole on the cover of the first pole 2 and then through the central hole of the current transformer 6. The output terminal of the second pole 3 is connected to the stationary contact via a wire, which also passes through the central hole of the current transformer 6. A lever 7 is fixedly connected inside the second pole 3, and a moving contact 8 is disposed above the lever 7 inside the second pole 3. The second pole 3 also contains a positioning... Below the lever 7, the micro switch 9 has a torsion spring 10 inside the second pole 3 to provide a restoring force to the lever 7. The top of the lever 7 has an upper protruding contact 701 that abuts against the moving contact 8, and the bottom of the lever 7 has a lower protruding contact 702. The micro switch 9 has a spring plate 901 that abuts against the lower protruding contact 702. The micro switch 9 has an operating button 902 located below the spring plate 901. The bottom of the micro switch 9 has a common point 903 and a normally open / closed point 904. When the circuit breaker is in the open state, the lever 7 rotates to the right under the action of the torsion spring 10, so that the upper protruding contact 701 of the lever 7 contacts the moving contact 8 of the second pole 3, and the lower protruding contact 702 contacts the spring plate 901 of the micro switch 9. When the spring plate 901 is pressed down, the operating button 902 of the microswitch 9 is pressed, causing the normally closed contact 904 of the microswitch 9 to become normally open. During the circuit breaker closing process, the upper protruding contact 701 of the lever 7, under the rotation of the moving contact 8, overcomes the torque of the torsion spring 10 and rotates to the left, causing the lower protruding contact 702 to separate from the spring plate 901 of the microswitch 9. The operating button 902 of the microswitch 9 then pops up, and the contact of the microswitch 9 becomes normally closed. The electromagnetic trip unit 4, the thermal element 5, and the current transformer 6 are located inside the first pole 2. The electromagnetic trip unit 4 provides circuit protection, the thermal element 5 provides overload protection, and the current transformer 6 detects leakage current. The function of this device is to fully utilize the space of the circuit breaker without changing its size. By adding a lever 7 and a micro switch 9, it can achieve a small residual current circuit breaker that can be used for both top and bottom entry, making full use of the circuit breaker's space and arranging it rationally. It has advantages such as low cost and convenient installation. The state of the lever 7 controls the switching of the normally open and closed contacts 904 of the micro switch 9, thereby controlling the connection and disconnection of the power supply line of the circuit board. This avoids the situation where, when a leakage fault occurs in the circuit, the voltage is still applied to the trip coil after the residual current circuit breaker trips, which would burn out the trip coil and cause the entire residual current circuit breaker to lose its leakage protection function. The time when the contacts of the micro switch 9 change from the open state to the closed state is before the contact between the moving contact 8 and the stationary contact of the second pole 3.

[0026] Specifically, such as Figure 3 and Figure 5As shown, the interior of the second pole 3 is provided with a first groove 11 for fixing the lever 7. The first groove 11 is provided with a fixing mounting groove for installing the torsion spring 10. The middle part of the first groove 11 is provided with a stepped protrusion 12. The bottom of the lever 7 is provided with a stepped groove 13 that is gap-fitted with the stepped protrusion 12, providing fixing and rotation functions for the lever 7. The opening of the first groove 11 and the stepped protrusion 12 in the middle provide torsional fixing for the torsion spring 10.

[0027] Specifically, such as Figure 5 As shown, the bottom edge of the lever 7 is provided with a boss 703, the bottom of the torsion spring 10 is provided with a first support arm 1001 that abuts against the notch edge of the first groove 11, and the top of the torsion spring 10 is provided with a second support arm 1002 that abuts against the boss 703.

[0028] The two common points 903 of the micro switch 9 are connected to the lower ends of the first pole 2 and the second pole 3 respectively by wires, and the two normally open and closed points 904 of the micro switch 9 are connected to the circuit board by wires.

[0029] The second pole 3 has a second groove 14 inside for fixing the micro switch 9.

[0030] During operation, this type of miniature residual current circuit breaker incorporates an electromagnetic trip unit 4, a thermal element 5, and a current transformer 6 within the first pole 2. The electromagnetic trip unit 4 provides circuit protection, the thermal element 5 provides overload protection, and the current transformer 6 detects leakage current. Without altering the circuit breaker's size, the addition of a lever 7 and a microswitch 9 allows for efficient use of space and a rational layout, enabling both top and bottom entry points for the residual current circuit breaker. This design offers advantages such as low cost and easy installation. Specifically, when the circuit breaker is in the open position, the lever 7 is engaged with the torsion spring 1. Under the action of 0, the lever 7 rotates to the right, causing the upper protruding contact 701 of the lever 7 to contact the moving contact 8 of the second pole 3, and the lower protruding contact 702 to contact the spring plate 901 of the micro switch 9. The spring plate 901 is pressed down, pressing the operating button 902 of the micro switch 9, so that the normally closed contact 904 of the micro switch 9 becomes the normally open contact. During the circuit breaker closing process, the upper protruding contact 701 of the lever 7, under the rotation of the moving contact 8, overcomes the torque of the torsion spring 10 and rotates to the left, causing the lower protruding contact 702 to separate from the spring plate 901 of the micro switch 9. The operating button 902 of the micro switch 9 pops up, and the contact of the micro switch 9 becomes the normally closed contact.

[0031] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A miniature residual current circuit breaker, comprising a circuit breaker body (1) and a circuit board disposed inside the circuit breaker body (1), characterized in that, The circuit breaker body (1) includes a first pole (2) and a second pole (3). The first pole (2) is equipped with an electromagnetic trip unit (4), a thermal element (5) and a current transformer (6). The second pole (3) is fixedly connected with a lever (7). The second pole (3) is equipped with a moving contact (8) located above the lever (7). The second pole (3) is also equipped with a micro switch (9) located below the lever (7). The second pole (3) is equipped with a torsion spring (10) that provides a restoring force to the lever (7). The top of the lever (7) is provided with an upper protruding contact (701) that abuts against the moving contact (8), and the bottom of the lever (7) is provided with a lower protruding contact (702). The micro switch (9) is provided with a spring plate (901) that abuts against the lower protruding contact (702). The micro switch (9) is provided with an operating button (902) located below the spring plate (901). The bottom of the micro switch (9) is provided with a common point (903) and a normally open / closed point (904).

2. A small size residual current circuit breaker according to claim 1, characterized in that The second pole (3) has a first groove (11) inside for fixing the lever (7), and the middle part of the first groove (11) is a stepped protrusion (12).

3. A small size residual current circuit breaker according to claim 2, characterized in that The bottom of the lever (7) is provided with a stepped groove (13) that is gap-fitted with the stepped protrusion (12).

4. A small-size residual-current circuit breaker according to claim 3, characterized in that The bottom edge of the lever (7) is provided with a boss (703).

5. A small-size residual-current circuit breaker according to claim 4, characterized in that The bottom of the torsion spring (10) has a first support arm (1001) that abuts against the notch edge of the first groove (11), and the top of the torsion spring (10) has a second support arm (1002) that abuts against the boss (703).

6. A small-size residual-current circuit breaker according to claim 1, characterized in that The two common points (903) of the micro switch (9) are connected to the lower ends of the first pole (2) and the second pole (3) respectively by wires, and the two normally open and closed points (904) of the micro switch (9) are connected to the circuit board by wires.

7. A miniature residual current circuit breaker according to claim 1, characterized in that, The interior of the second pole (3) is provided with a second groove (14) for fixing the micro switch (9).

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