Molded case circuit breaker with voltage indication

Abstract

The utility model provides a molded case circuit breaker with voltage indication, comprising: a shell, a contact module arranged in the shell, an operating mechanism and a voltage indicating module; the shell comprises a base and a middle cover arranged on the base, the base and the middle cover are combined to form a cavity for installing the contact module and the operating mechanism; the middle cover is provided with an accessory installation groove on the outer side surface relative to the cavity, the middle cover is provided with an accessory installation groove on the outer side surface relative to the cavity, the voltage indicating module comprises a voltage indicating component arranged in the accessory installation groove, the middle cover is also provided with a first wiring hole and a second wiring hole penetrating from the outer side surface to the cavity, the first wiring terminal of the voltage indicating component is electrically connected to the incoming line end element of the molded case circuit breaker through the first wiring hole through the first wiring, and the second wiring terminal of the voltage indicating component is electrically connected to the outgoing line end element of the molded case circuit breaker through the second wiring hole through the second wiring.

Description

Technical Field

[0001] The utility model relates to the field of electric power equipment, in particular to a molded case circuit breaker with voltage indication. Background Art

[0002] Molded case circuit breakers are also called device-type circuit breakers. All parts are sealed in a plastic shell, and auxiliary contacts, undervoltage releases, and shunt releases are mostly modular. Its structure is very compact, and it is mostly operated manually. Large capacity can be selected for electric separation and closing.

[0003] The market has increasingly higher requirements for the functions of molded case circuit breakers. Existing molded case circuit breakers lack the function of indicating the voltage conditions at the inlet and outlet terminals when the circuit breaker is in the closed or open state, which does not provide a good guarantee for the safety of installation and maintenance personnel. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provide a molded case circuit breaker with voltage indication.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A molded case circuit breaker with voltage indication, comprising: a housing, a contact module arranged in the housing, an operating mechanism and a voltage indication module;

[0007] The housing comprises a base and a middle cover arranged on the base, wherein the base and the middle cover are combined to form a cavity for installing the contact module and the operating mechanism;

[0008] The middle cover is provided with an accessory mounting groove relative to the outer side surface of the cavity, the voltage indication module includes a voltage indication component arranged in the accessory mounting groove, and the middle cover is also provided with a first wiring hole and a second wiring hole penetrating from the outer side surface to the cavity, the voltage indication component is electrically connected to the incoming terminal component of the molded case circuit breaker through the first wiring hole through the first wiring hole, and the voltage indication component is electrically connected to the outgoing terminal component of the molded case circuit breaker through the second wiring hole through the second wiring.

[0009] Preferably, the voltage indication module also includes an adapter plate fixedly arranged at the bottom of the accessory mounting slot, the first terminal and the second terminal of the adapter plate are respectively connected to the first wiring and the second wiring, and the voltage indication component is plugged into the adapter plate through a quick connection terminal to achieve electrical connection with the incoming line element and the outgoing line element.

[0010] Preferably, an upper cover is further provided on the middle cover, and a light-transmitting structure is provided on the upper cover at a position corresponding to the voltage indicating component.

[0011] Preferably, the light-transmitting structure is a transparent structure or a light-transmitting hole.

[0012] Preferably, the outer side surface of the middle cover is further provided with a plurality of first limiting structures and second limiting structures for limiting the first wiring and the second wiring respectively.

[0013] Preferably, the first limiting structure is formed by at least three first limiting columns in a triangular layout, and the second limiting structure is formed by at least three second limiting columns in a triangular layout.

[0014] Preferably, the first wiring is electrically connected to the static contact of the contact module.

[0015] Preferably, the stationary contact is connected to a first wiring terminal, and the first wiring is electrically connected to the stationary contact through the first wiring terminal.

[0016] Preferably, the first wiring terminal and the static contact are fixedly connected by spot welding or by screws.

[0017] Preferably, the molded case circuit breaker further includes a tripping system, and the second wiring is electrically connected to a thermal element of the tripping system.

[0018] Preferably, the thermal element is connected to a second wiring terminal, and the second wiring is electrically connected to the thermal element via the second wiring terminal.

[0019] Preferably, the voltage indicating component comprises: a component housing, a circuit board disposed in the component housing, and a first quick-connect plug electrically connected to the circuit board.

[0020] Preferably, the circuit board includes an input-end indication circuit, the input-end indication circuit includes a first step-down circuit and a first indication circuit, the first step-down circuit includes a plurality of first series resistors connected in series, the first indication circuit includes a first indicator light arranged in parallel with one of the plurality of first series resistors, a first unidirectional diode connected in parallel with the first indicator light, and a first protection resistor connected in series with the first unidirectional diode.

[0021] Preferably, the circuit board also includes an output end indication circuit, the output end indication circuit includes a second step-down circuit and a second indication circuit, the second step-down circuit includes a plurality of second series resistors connected in series, the second indication circuit includes a second indicator light arranged in parallel with one of the plurality of second series resistors, a second unidirectional diode connected in parallel with the second indicator light, and a protection resistor connected in series with the second unidirectional diode.

[0022] Preferably, an anti-foolproofing installation groove is provided at one end of the accessory installation groove, and an anti-foolproofing protrusion is provided at a position of the component housing corresponding to the anti-foolproofing installation groove.

[0023] Preferably, the fool-proof protrusion is locked to the fool-proof mounting groove by means of screws.

[0024] Preferably, an anti-foolproof mounting groove is provided at one end of the accessory mounting groove, and an elastic strip structure is provided at the position of the component shell corresponding to the anti-foolproof mounting groove. A buckle is also provided at the end of the elastic strip structure, and a bayonet is provided in the corresponding anti-foolproof mounting groove. The buckle on the elastic strip structure can be inserted into the bayonet after installation, thereby forming a fixed limit for the component shell in the accessory mounting groove.

[0025] The molded case circuit breaker of the utility model is provided with a voltage indicating module, which adopts a modular design and is installed in an accessory installation groove outside the middle cover. The voltage indicating module is divided into a voltage indicating component and an adapter plate. The voltage indicating component of the voltage indicating module is used to indicate the voltage conditions of the input and output line terminals. Power is taken from the input and output line terminals through the adapter plate. The voltage indicating component and the adapter plate are plugged together, which is convenient for replacing or repairing the voltage indicating component. The voltage indicating module has a voltage indication function and does not require major changes to the existing molded case circuit breaker structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure decomposition of a molded case circuit breaker with voltage indication according to an embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of a middle cover in an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of another middle cover of the embodiment of the utility model;

[0029] Figure 4 yes Figure 3 A enlarged view in;

[0030] Figure 5 This is a wiring diagram on a middle cover of an embodiment of the utility model (without the indicator light assembly installed);

[0031] Figure 6 This is a wiring diagram of an embodiment of the utility model (installing the indicator light assembly);

[0032] Figure 7 This is a wiring diagram on another middle cover of the utility model embodiment (without the indicator light assembly installed);

[0033] Figure 8 This is another wiring diagram on the middle cover of the utility model embodiment (installation of indicator light assembly);

[0034] Fig. 9 It is a structural schematic diagram (welding) of the static contact and the first wiring connection of the embodiment of the utility model;

[0035] Fig.10 It is a schematic diagram of the connection method between the static contact and the first wiring in the embodiment of the utility model (screw connection);

[0036] Fig.11 It is a schematic diagram of the structure of the connection between the thermal element and the second wiring in the embodiment of the utility model;

[0037] Fig.12 It is a schematic diagram of the connection method between the thermal element and the second wiring in the embodiment of the utility model (screw connection);

[0038] Fig.13 This is a structural schematic diagram of an indicator light module according to an embodiment of the utility model;

[0039] Fig.14 This is a schematic diagram of the structure of another indicator light module according to an embodiment of the utility model;

[0040] Fig.15 It is a schematic diagram of the input terminal indication circuit of the embodiment of the utility model (incoming line terminal);

[0041] Fig.16 It is a schematic diagram of the output end indicating circuit of the embodiment of the utility model (output end).

[0042] The reference numerals in the figures are as follows:

[0043] Housing 100, base 110, middle cover 120, upper cover 130, accessory mounting slot 121, first wiring hole 122, second wiring hole 123, first limiting structure 124, second limiting structure 125, first limiting column 1241, second limiting column 1251, foolproof mounting slot 127, bayonet 129;

[0044] Contact module 200, static contact 210, first connection terminal 211;

[0045] Operating mechanism 300;

[0046] Tripping system 400, thermal element 410, second terminal 411;

[0047] Voltage indication module 500, adapter board 510, voltage indication component 520, component housing 521, circuit board 522, first quick-connect plug 523, anti-mistake protrusion 527, elastic strip structure 528, buckle 529, first wiring 531, second wiring 532, input end indication circuit 522a, output end indication circuit 522b, first step-down circuit 5221, first indication circuit 5222, second step-down circuit 5223, second indication circuit 5224. DETAILED DESCRIPTION

[0048] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the panel assembly of the present utility model. The panel assembly of the present utility model is not limited to the description of the following embodiments.

[0049] like Figure 1 As shown, this embodiment provides a molded case circuit breaker with voltage indication, comprising: a housing 100, a contact module 200 disposed in the housing 100, an operating mechanism 300, and a voltage indicating module 500. The housing 100 comprises a base 110 and a middle cover 120 disposed on the base 110, and the base 110 and the middle cover 120 are combined to form a cavity for mounting the contact module 200 and the operating mechanism 300.

[0050] In this embodiment, combined with Figure 2-8 As shown, the middle cover 120 is provided with an accessory mounting groove 121 relative to the outer side surface of the cavity, the voltage indication module 500 includes an adapter plate 510 fixedly arranged in the accessory mounting groove 121 and a voltage indication component 520 plugged into the adapter plate 510 through a quick connection terminal, the middle cover 120 is also provided with a first wiring hole 122 and a second wiring hole 123 that penetrate from the outer side surface into the cavity, the first wiring terminal of the adapter plate 510 is electrically connected to the incoming terminal element of the molded case circuit breaker through the first wiring hole 122 via a first wiring 531 laid on the outer side surface of the middle cover 120, and the second wiring terminal of the adapter plate 510 is electrically connected to the outgoing terminal element of the molded case circuit breaker through the second wiring hole 123 via a second wiring 532 laid on the outer side surface of the middle cover 120.

[0051] Of course, the voltage indicating component 520 can also be directly connected to the first wiring 531 and the second wiring 532 respectively without providing the adapter plate 510. In this embodiment, the adapter plate 510 can be provided to realize the rapid plug-in installation and removal of the voltage indicating component 520, so as to facilitate installation and maintenance.

[0052] In this embodiment, the number of first wires 531 is designed according to the number of poles of the circuit breaker, and the incoming end of each circuit breaker pole is connected to the adapter plate 510 through a first wire 531. Similarly, the number of second wires 532 is also designed according to the number of poles of the circuit breaker, and the outgoing end of each circuit breaker pole is connected to the adapter plate 510 through a second wire 532. The first wire 531 and the second wire 532 can be soft conductors or hard conductors.

[0053] In one embodiment, the first wiring hole 122 can be one, and multiple first wirings 531 pass through the first wiring hole 122 to penetrate into the circuit breaker cavity and are respectively connected to the incoming line end components of each circuit breaker pole. Of course, the first wiring hole 122 can also be added on the middle cover 120 according to the position of the circuit breaker pole. Similarly, the second wiring hole 123 can also be one, or can be added according to the position of the circuit breaker pole.

[0054] In one embodiment, the voltage may be displayed only for the incoming line of the circuit breaker, or only for the outgoing line, that is, only the first line 531 is set at the incoming line, or only the second line 532 is set at the outgoing line.

[0055] As a specific implementation, the accessory installation slot 121 is provided on one side corresponding to the operating mechanism 300, and an additional accessory installation slot may be provided on the other side opposite thereto for installing other accessories. The first wiring 531 and the second wiring 532 are arranged from the other two sides respectively.

[0056] As a further improvement, an upper cover 130 is further provided on the middle cover 120, and a light-transmitting structure is provided on the upper cover 130 at a position corresponding to the voltage indicating component 520. The upper cover and the middle cover 120 form a space for accommodating the voltage indicating module 500 and protecting the voltage indicating module 500. The light-transmitting structure enables the user to clearly see the indication of the voltage indicating module 50.

[0057] Furthermore, the light-transmitting structure is a transparent structure or a light-transmitting hole, that is, the upper cover 130 is partially or completely formed of light-transmitting plastic, or a light-transmitting hole is provided in the area corresponding to the voltage indicating module 500 so that the indicating light can pass through.

[0058] like Figure 13-14 As shown, the voltage indication component 520 includes: a component housing 521, a circuit board 522 disposed in the component housing 521, and a first quick-connect plug 523 electrically connected to the circuit board 522. The first quick-connect plug 523 is used to quickly connect with the second quick-connect plug 513 of the adapter plate 510. When a customer needs a molded case circuit breaker with voltage indication, the adapter plate 510 is installed in the accessory installation slot 121, connected through the first wiring 531 and the second wiring 532, and then the voltage indication component 520 is plugged in, and then the upper cover 130 is closed. When the voltage indication component 520 fails, it is only necessary to remove the upper cover 130 and replace the voltage indication component 520.

[0059] Furthermore, the adapter board can also be integrated with the circuit board of the voltage indicating component 520 and can be installed as a whole during installation.

[0060] The molded case circuit breaker of this embodiment is provided with a voltage indicating module, which adopts a modular design and is installed in the accessory installation slot on the outside of the middle cover 120. The voltage indicating module is divided into a voltage indicating component 520 and an adapter plate 510. The voltage indicating component 520 of the voltage indicating module is used to indicate the voltage status of the input and output terminals. Power is taken from the input and output terminals through the adapter plate 510. The voltage indicating component 520 and the adapter plate 510 are plugged together, which is convenient for replacing or repairing the voltage indicating component 520. It has a voltage indication function and does not require major changes to the existing molded case circuit breaker structure.

[0061] In this embodiment, a plurality of first limiting structures 124 and second limiting structures 125 are further provided on the outer side surface of the middle cover 120 for limiting the first wiring 531 and the second wiring 532 respectively.

[0062] In this embodiment, if Figure 2 and Figure 5 As shown, the first limiting structure 124 is formed by at least three first limiting columns 1241 in a triangular layout, constituting a limit for the first line 531, including clamping and turning. Figure 7 , Figure 8 As shown, the first limiting structure 124 can also be formed by at least two first limiting columns 1241 arranged in parallel to clamp the first trace 531. Similarly, the second limiting structure 125 can also be formed by at least two second limiting columns 1251 arranged in parallel or at least three second limiting columns 1251 arranged in a triangle.

[0063] As an optional implementation, the first wiring 531 is electrically connected to the stationary contact 210 of the contact module 200 .

[0064] like Fig. 9 and Fig.10 As shown, the first wiring 531 is electrically connected to the static contact 210 through the first wiring terminal 211 .

[0065] As an optional implementation, Fig. 9 As shown, the first terminal 211 and the stationary contact 210 are welded at the welding point 517a by spot welding.

[0066] As another optional implementation, Fig.10 As shown, the first wiring terminal 211 and the stationary contact 210 are fixedly connected by a screw 517b. Obviously, the first wiring terminal 211 and the stationary contact 210 can also be fixedly connected by other means.

[0067] In this embodiment, combined with Figure 1 , 11As shown in Figures 1 and 12, the molded case circuit breaker further includes a tripping system 400, and the second wiring 532 is electrically connected to the thermal element 410 of the tripping system 400. The tripping system 400 of this embodiment is a thermal magnetic tripping device, which is used to drive the operating mechanism 300 to trip in case of overload and short circuit to achieve protection. In this embodiment, the second wiring 532 is connected to the thermal element 410, and it is obvious that it can also be electrically connected to other components of the tripping system 400.

[0068] Furthermore, the thermal element 410 is connected to a second terminal 411, and the terminal of the second wiring 532 is connected to the second terminal 411 to achieve electrical connection with the thermal element 410. Similarly, the second terminal 411 can also be connected through a solder point 417a and a screw 417b.

[0069] In this embodiment, if Figure 13-14 As shown, the voltage indicating component 520 includes: a component housing 521, a circuit board 522 disposed in the component housing 521, and a first quick-connect plug 523 electrically connected to the circuit board 522, and the first quick-connect plug 523 is used for quick-connect connection with the second quick-connect plug 513 of the adapter plate 510.

[0070] Specifically, Fig.13 , 15 As shown, the circuit board 522 includes an input terminal indication circuit 522a, which is connected to the adapter board 510 via a first quick-connect plug 523. Fig.15 As shown, the input end indicating circuit 522a includes a first step-down circuit 5221 and a first indicating circuit 5222. The first step-down circuit 5221 includes a plurality of first series resistors (R1 to R14) connected in series. The voltage of 380V can be reduced to the working voltage (3V) of LED2 through the step-down circuit 5221. The first indicating circuit 5222 includes a first indicator LED2 connected in parallel with at least one of the plurality of first series resistors (such as resistor R14), a first unidirectional diode D1 connected in parallel with the first indicator LED2, and a first protection resistor R29 connected in series with the first unidirectional diode D1.

[0071] Specifically, Fig.16 As shown, the circuit board 522 also includes an output end indication circuit 522b, and the output end indication circuit 522b includes a second step-down circuit 5223 and a second indication circuit 5224, the second step-down circuit 5223 includes a plurality of second series resistors connected in series, and the second indication circuit 5224 includes a second indicator LED4 arranged in parallel with at least one of the plurality of second series resistors, a second unidirectional diode D3 connected in parallel with the second indicator LED4, and a protection resistor R30 connected in series with the second unidirectional diode D3.

[0072] The first indicator LED2 on the voltage indicating module indicates the voltage at the incoming line, and the second indicator LED4 on the voltage indicating module indicates the voltage at the outgoing line, thereby realizing the indication function of the voltage at the incoming and outgoing lines when the circuit breaker is closed or open.

[0073] In this embodiment, Figure 2 and 13 As shown, one end of the accessory mounting slot 121 is provided with an anti-foolproof mounting slot 127, and the component housing 521 is provided with an anti-foolproof protrusion 527 at a position corresponding to the anti-foolproof mounting slot 127. Further, the anti-foolproof protrusion 527 is locked to the anti-foolproof mounting slot 127 by screws.

[0074] As another specific implementation, Figure 3 , 4 as well as Fig.14 As shown, the component housing 521 is provided with an elastic strip structure 528 at the position corresponding to the foolproof installation slot 127, which corresponds to the shape of the foolproof installation slot 127 to form a foolproof installation. A buckle 529 is also provided at the end of the elastic strip structure 528, and a bayonet 129 is provided in the corresponding foolproof installation slot 127. The buckle 529 on the elastic strip structure 528 can be inserted into the bayonet 129 after installation, forming a fixed limit for the component housing 521 in the accessory installation slot 121.

[0075] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0076] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A molded case circuit breaker with voltage indication, characterized in that: include: A housing (100), a contact module (200) arranged in the housing (100), an operating mechanism (300), and a voltage indication module (500); The housing (100) comprises a base (110) and a middle cover (120) disposed on the base (110), wherein the base (110) and the middle cover (120) are combined to form a cavity for installing the contact module (200) and the operating mechanism (300); The middle cover (120) is provided with an accessory installation groove (121) on the outer side surface relative to the cavity; the voltage indication module (500) comprises a voltage indication component (520) arranged in the accessory installation groove (121); the middle cover (120) is further provided with a first wiring hole (122) and a second wiring hole (123) penetrating from the outer side surface into the cavity; the voltage indication component (520) is electrically connected to the incoming line component of the molded case circuit breaker through the first wiring hole (122) via a first wiring (531); and the voltage indication component (520) is electrically connected to the outgoing line component of the molded case circuit breaker through the second wiring hole (123) via a second wiring (532).

2. The molded case circuit breaker with voltage indication according to claim 1, characterized in that: The voltage indicating module (500) further comprises an adapter plate (510) fixedly arranged at the bottom of the accessory installation slot (121); a first wiring terminal and a second wiring terminal of the adapter plate (510) are respectively connected to the first wiring (531) and the second wiring (532); and the voltage indicating component (520) is plugged into the adapter plate (510) via a quick connection terminal to achieve electrical connection with the incoming line component and the outgoing line component.

3. The molded case circuit breaker with voltage indication according to claim 1, characterized in that: An upper cover (130) is also provided on the middle cover (120), and a light-transmitting structure is provided on the upper cover (130) at a position corresponding to the voltage indicating component (520).

4. The molded case circuit breaker with voltage indication according to claim 3, characterized in that: The light-transmitting structure is a transparent structure or a light-transmitting hole.

5. The molded case circuit breaker with voltage indication according to claim 1, characterized in that: The outer side surface of the middle cover (120) is also provided with a plurality of first limiting structures (124) and second limiting structures (125) for limiting the first routing line (531) and the second routing line (532) respectively.

6. The molded case circuit breaker with voltage indication according to claim 5, characterized in that: The first limiting structure (124) is formed by at least two first limiting columns (1241) arranged in parallel or at least three first limiting columns (1241) are arranged in a triangular shape, and the second limiting structure (125) is formed by at least two second limiting columns (1251) arranged in parallel or at least three second limiting columns (1251) are arranged in a triangular shape.

7. The molded case circuit breaker with voltage indication according to claim 1, characterized in that: The first wiring (531) is electrically connected to the stationary contact (210) of the contact module (200).

8. The molded case circuit breaker with voltage indication according to claim 7, characterized in that: The stationary contact (210) is connected to a first wiring terminal (211), and the first wiring (531) is electrically connected to the stationary contact (210) via the first wiring terminal (211).

9. The molded case circuit breaker with voltage indication according to claim 8, characterized in that: The first wiring terminal (211) is fixedly connected to the static contact (210) by spot welding or by screws.

10. The molded case circuit breaker with voltage indication according to claim 1, characterized in that: The molded case circuit breaker also includes a tripping system (400), and the second wiring (532) is electrically connected to a thermal element (410) of the tripping system (400).

11. The molded case circuit breaker with voltage indication according to claim 10, characterized in that: The thermal element (410) is connected to a second wiring terminal (411), and the second wiring (532) is electrically connected to the thermal element (410) via the second wiring terminal (411).

12. The molded case circuit breaker with voltage indication according to claim 1, characterized in that: The voltage indicating component (520) comprises: a component housing (521), a circuit board (522) disposed in the component housing (521), and a first quick-connect plug (523) electrically connected to the circuit board (522).

13. The molded case circuit breaker with voltage indication according to claim 12, characterized in that: The circuit board (522) comprises an input end indication circuit (522a), the input end indication circuit (522a) comprises a first step-down circuit (5221) and a first indication circuit (5222), the first step-down circuit (5221) comprises a plurality of first series resistors connected in series, the first indication circuit (5222) comprises a first indicator light LED2 connected in parallel with one of the plurality of first series resistors, a first unidirectional diode D1 connected in parallel with the first indicator light LED2, and a first protection resistor R29 connected in series with the first unidirectional diode D1.

14. The molded case circuit breaker with voltage indication according to claim 12, characterized in that: The circuit board (522) further comprises an output end indication circuit (522b), wherein the output end indication circuit (522b) comprises a second step-down circuit (5223) and a second indication circuit (5224), wherein the second step-down circuit (5223) comprises a plurality of second series resistors connected in series, and the second indication circuit (5224) comprises a second indicator light LED4 connected in parallel with one of the plurality of second series resistors, a second unidirectional diode D3 connected in parallel with the second indicator light LED4, and a protection resistor R30 connected in series with the second unidirectional diode D3.

15. The molded case circuit breaker with voltage indication according to claim 12, characterized in that: One end of the accessory installation slot (121) is provided with an anti-foolproof installation slot (127), and the component housing (521) is provided with an anti-foolproof protrusion (527) at a position corresponding to the anti-foolproof installation slot (127).

16. The molded case circuit breaker with voltage indication according to claim 15, characterized in that: The fool-proof protrusion (527) is locked onto the fool-proof mounting groove (127) by means of screws.

17. The molded case circuit breaker with voltage indication according to claim 12, characterized in that: An anti-foolproofing installation groove (127) is provided at one end of the accessory installation groove (121), and an elastic strip structure (528) is provided at a position corresponding to the anti-foolproofing installation groove (127) of the component housing (521), and a buckle (529) is also provided at the end of the elastic strip structure (528), and a bayonet (129) is provided in the corresponding anti-foolproofing installation groove (127). After installation, the buckle (529) on the elastic strip structure (528) can be snapped into the bayonet (129), thereby forming a fixed limit for the component housing (521) in the accessory installation groove (121).

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