Molded-case circuit breaker having arcing elimination apparatus

Abstract

A molded-case circuit breaker having an arcing elimination apparatus (200), the molded-case circuit breaker comprising a circuit breaker main body (100) cooperatively provided with an arcing elimination apparatus (200); the outer side surface (2B) of the arcing elimination apparatus (200) protrudes out of a first installation surface (1B) of the lateral side of the circuit breaker main body (100), the first installation surface (1B) being provided with a wiring position used for connecting to an external line; the bottom surface (2C) of the arcing elimination apparatus is higher than the wiring position, such that a wiring operation space (400) is formed between the bottom surface (2C) of the arcing elimination apparatus and the first installation surface (1B). With respect to the present apparatus, the transverse position occupied by the arcing elimination apparatus (200) is maximally utilized and the wiring position is reserved at a corner formed between the underside of the arcing elimination apparatus (200) and the lateral side of the first installation surface (1B) of the circuit breaker main body (100), so as to form the wiring operation space, such that the overall size of the circuit breaker having the arcing elimination apparatus (200) can be as small as possible, thus satisfying various installation conditions.

Description

A molded case circuit breaker with an arc elimination device Technical Field

[0001] The utility model relates to the field of molded case circuit breakers, in particular to a molded case circuit breaker with an arc elimination device. Background Art

[0002] Arcing safety issues in the molded case circuit breaker industry have long been a concern. Commercially available molded case circuit breakers often arc and spark during short-circuit protection, posing a significant safety hazard. This is due to the lack of arc exhaust channels, or the short exhaust channels, which result in large arcing sparks outside the circuit breaker. To address this arcing issue, existing patents incorporate arc-eliminating devices at the arcing site on the circuit breaker's exterior.

[0003] For example, the invention patent application number 202110169989.9 provides a zero-flashover molded case circuit breaker, which includes: a circuit breaker body with an arc extinguishing system and a closed baffle disposed at the rear side of the arc extinguishing system; an air duct disposed between the arc extinguishing system and the baffle and extending upward in a vertical direction, the height of the air duct being greater than the internal arc distance of the circuit breaker. The air duct can extinguish the remaining flashover discharged from the rear side of the arc extinguishing system. Because the air duct is disposed vertically, it rationally utilizes the longitudinal space of the circuit breaker body without increasing the length of the circuit breaker, which is more conducive to achieving product miniaturization.

[0004] However, this patent places the air duct inside the circuit breaker housing, and extends the conductive member 4, which connects the conductive busbar 6 to the internal circuitry of the circuit breaker body, outside the air duct. The conductive busbar 6 is then fixedly connected to the terminal block 43 via a fastening assembly. This design increases the horizontal length of the circuit breaker body, thereby increasing the overall size of the circuit breaker, making it difficult to install and use. Furthermore, in this device, the air duct is separated from the conductive member 4 by a baffle 11, leaving the terminal block 43 located outside the baffle 11, making it difficult to achieve adequate electrical isolation.

[0005] Therefore, the applicant hopes to design a molded case circuit breaker with an arc elimination device, and design the layout while meeting the arc elimination function, so that it can not only install the arc elimination structure, but also leave space for wiring operations without increasing the horizontal length of the circuit breaker. Technical issues

[0006] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a molded case circuit breaker with an arc elimination device. The technical solution adopted by the present invention is as follows. Technical Solutions

[0007] A molded case circuit breaker with an arc extinguishing device includes a circuit breaker body equipped with the arc extinguishing device. The outer side surface of the arc extinguishing device protrudes from a first mounting surface on the side of the circuit breaker body. The first mounting surface is provided with a wiring position for connecting to an external circuit. The bottom surface of the arc extinguishing device is higher than the wiring position, so that a wiring operation space is formed between the bottom surface of the arc extinguishing device and the first mounting surface.

[0008] The above-mentioned wiring position refers to the position reserved on the first installation surface of the circuit breaker body for connection with the external circuit.

[0009] Preferably, the circuit breaker body is provided with an arc extinguishing system near the first mounting surface; an arc outlet space is provided inside the arc extinguishing device; an arc discharge outlet for connecting the arc extinguishing system and the arc outlet space is provided on the circuit breaker body; the arc extinguishing device has an insulating bottom surface of the arc extinguishing device, and the arc outlet space is electrically isolated from the wiring operation space by the bottom surface of the arc extinguishing device.

[0010] The wiring position is provided with a main body wiring terminal of the circuit breaker body and a user external terminal. The user external terminal is connected to the main body wiring terminal and extends into the wiring operation space. There is a gap between the user external terminal and the bottom surface of the arc elimination device.

[0011] The side of the arc extinguishing device away from the circuit breaker body is the outer side of the extinguishing device. The lateral position of the outer side of the arc extinguishing device does not exceed the position of the outer end of the user external terminal. The outer end of the user external terminal refers to the end away from the circuit breaker body.

[0012] Preferably, the arc elimination device includes a cover body, in which at least one exhaust channel is provided, the exhaust channel has an air inlet and an air outlet, and has at least one bend between the air inlet and the air outlet, such as a curved air channel or a spiral air channel arranged in a curve.

[0013] Preferably, at least one upward channel unit having an upward air-guiding tendency and at least one downward channel unit having a downward air-guiding tendency are provided between the air inlet and the air outlet. The upward channel unit and the downward channel unit can be vertical upward or downward air channels, or can be inclined upward or downward, curved upward or downward air channels, and the upward channel and the downward channel are connected, and at least one arc-extinguishing plate is provided in the above-mentioned exhaust channel.

[0014] Preferably, a rotatable operating handle is provided on the circuit breaker body. The operating handle has a swinging path for swinging to drive the operating mechanism, and the operating handle has a step and a rotating handle protruding from the step surface to form an operation. The highest point of the step surface displaces as the operating handle swings. The rotating handle protrudes from the step, and the top of the rotating handle is the top of the operating handle. The height H1 of the top surface of the arc elimination device relative to the highest point of the motion trajectory of the step position of the operating handle matches the height H2 of the highest point of the motion trajectory of the top end of the operating handle relative to the highest point of the motion trajectory of the step position of the operating handle.

[0015] Preferably, the range of H1 is 0.1*H2~3*H2, so that the top surface of the arc elimination device is slightly higher than the top surface of the step.

[0016] As the most preferred embodiment, the range of H1 is 0.95*H2~1.05*H2, so as to meet the installation requirements of the arc elimination device without additionally increasing the installation space height of the circuit breaker, thereby achieving the purpose of miniaturization of the product.

[0017] In conjunction with the above structure, one embodiment may be configured such that the highest point of the exhaust passage is higher than the top surface of the step or the top surface of the circuit breaker body, so as to fully utilize the height space of the arc elimination device to extend the exhaust passage. Beneficial effects

[0018] The beneficial effects of the present utility model are as follows: the present device maximizes the use of the lateral position occupied by the arc extinguishing device, reserves a wiring position at the angle between the bottom of the arc extinguishing device and the side of the first mounting surface of the circuit breaker body, and forms a wiring operation space, thereby making the overall volume of the circuit breaker with the arc extinguishing device as small as possible and meeting various installation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0020] FIG1 is a schematic structural diagram of a molded case circuit breaker according to an embodiment of the present invention;

[0021] FIG2 is an exploded view of a molded case circuit breaker according to an embodiment of the present invention;

[0022] FIG3 is a cross-sectional view of a molded case circuit breaker according to an embodiment of the present invention;

[0023] FIG4 is a schematic structural diagram of a circuit breaker body in one embodiment of the present invention;

[0024] FIG5 is an exploded view of a circuit breaker body in one embodiment of the present invention;

[0025] FIG6 is a schematic structural diagram of an upper cover in one embodiment of the present invention;

[0026] FIG7 is a schematic structural diagram of a base in one embodiment of the present invention;

[0027] FIG8 is a schematic structural diagram of a cover body in one embodiment of the present invention;

[0028] FIG9 is a schematic structural diagram of a channel forming block equipped with an arc extinguishing plate in one embodiment of the present invention;

[0029] FIG10 is a cross-sectional view of an arc elimination device according to an embodiment of the present invention;

[0030] FIG11 is a side view of a channel forming block in one embodiment of the present invention;

[0031] FIG12 is a schematic structural diagram of an arc extinguishing plate in one embodiment of the present invention;

[0032] In the figure, the circuit breaker body 100, the circuit breaker housing 110, the base 111, the first connecting plate 1111, the first limiting slot 1112, the limiting step 1113, the upper cover 112, the second connecting plate 1121, the second limiting plug 1122, the first vertical partition 113, the second vertical partition 114, the arc discharge outlet 115, the first wiring support 116, the second wiring support 117, the contact system 120, the moving contact 121, the static contact 122, the first conductive terminal 123, the second conductive terminal 124, the operating mechanism 130, the operating handle 131, and the arc extinguishing system 140.

[0033] Arc extinguishing device 200, exhaust channel 210, air inlet 211, air outlet 212, bend 213, widened groove 214, channel forming block 220, flow channel groove 221, arc extinguishing plate slot 222, arc extinguishing plate 231, small hole 232, cover 240, second mounting cavity 241, first opening 242, second opening 243, first connecting platform 244, second connecting platform 245, partition 246, first limiting insert 247, first side plate 248, second limiting slot 249;

[0034] Terminal extension plate-300, main body terminal-310, user external terminal-320;

[0035] Wiring operation space - 400;

[0036] 1A-top surface of operating handle step, 1B-first mounting surface, 1C-bottom surface of circuit breaker body, 2A-top surface of elimination device, 2B-outer surface of elimination device, 2C-bottom surface of arc elimination device. Best Mode for Carrying Out the Invention

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0038] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0039] The directional and positional terms used in this invention, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are used solely to refer to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are intended to illustrate and facilitate understanding of this invention and are not intended to limit the scope of protection of this invention.

[0040] As shown in FIG. 1-12 , a molded case circuit breaker includes a circuit breaker body 100 and an arc elimination device 200 .

[0041] The circuit breaker body 100 includes a circuit breaker housing 110 , a contact system 120 , an operating mechanism 130 , an arc extinguishing system 140 , and an overload protection system.

[0042] The circuit breaker housing 110 includes a base 111 and an upper cover 112. The base 111 is provided with a first installation cavity and a first installation opening at the upper end. The circuit breaker housing 110, contact system 120, operating mechanism 130, arc extinguishing system 140, and overload protection system are all installed in the first installation cavity. The upper cover 112 is connected to the first installation opening at the upper end of the base 111.

[0043] The contact system 120 includes a moving contact 121, a static contact 122, a first conductive wiring member 123 electrically connected to the moving contact 121, and a second conductive wiring member 124 electrically connected to the static contact 122. The first conductive wiring member 123 and the second conductive wiring member 124 pass through the circuit breaker housing 110, and the outside of the circuit breaker housing 110 is respectively provided with a first wiring support seat 116 and a second wiring support seat 117 corresponding to the first conductive wiring member 123 and the second conductive wiring member 124. Specifically, the first wiring support seat 116 and the second wiring support seat 117 are arranged at both ends of the base 111, and the base 111 is provided with a first vertical partition 113 inserted between the first wiring support seat 116 and the first mounting port, and a second vertical partition 114 inserted between the second wiring support seat 117 and the first mounting port. The first conductive wiring member 123 and the second conductive wiring member 124 are installed on the first wiring support seat 116 and the second wiring support seat 117 through the first mounting port, and then the first vertical partition 113 and the second vertical partition 114 are inserted above the first conductive wiring member 123 and the second conductive wiring member 124 to separate the inside and the outside, which facilitates installation and ensures electrical safety.

[0044] The operating mechanism 130 is connected to the movable contact 121 and is used to drive the movable contact 121 to rotate, thereby opening and closing the circuit breaker with the static contact 122. The device driving the operating mechanism 130 can be a manual drive mechanism and / or an automatic drive mechanism. A common manual drive mechanism is the operating handle 131 shown in the figure, and a common automatic drive mechanism can be a drive motor triggered by a control signal.

[0045] The arc extinguishing system 140 includes an arc extinguishing hood and a plurality of arc extinguishing grids arranged in the arc extinguishing hood. The arc extinguishing hood is provided with an arc inlet end and an arc outlet end. The arc inlet end is provided corresponding to the arc breaking path of the moving contact 121 and is provided above the static contact 122. The circuit breaker housing 110 is provided with an arc discharge outlet 115 corresponding to the arc outlet end.

[0046] The overload protection system cooperates with the operating mechanism 130 to drive the operating mechanism 130 to trip freely and rotate the moving contact 121 to open the circuit when a circuit fault occurs.

[0047] The arc extinguishing device 200 is connected to the circuit breaker housing 110 and is provided with at least one exhaust duct 210 having an air inlet 211 and an air outlet 212. The air inlet 211 is connected to the arc exhaust outlet 115 of the circuit breaker housing 110 and is used to collect gas exhausted from the circuit breaker body 100. The outer side surface 2B of the arc extinguishing device 200 protrudes from the first mounting surface 1B on the side of the circuit breaker body 100. The first mounting surface 1B is provided with a wiring position for connecting to an external circuit. The bottom surface 2C of the arc extinguishing device is higher than the wiring position, forming a wiring operation space 400 between the bottom surface 2C and the first mounting surface 1B. The arc extinguishing device 200 has an insulated bottom surface 2C, and the arc discharge space is electrically isolated from the wiring operation space 400 by the bottom surface 2C.

[0048] The wiring position is provided with the main body wiring terminal 310 of the circuit breaker body 100 and the user external terminal 320. The user external terminal 320 is connected to the main body wiring terminal 310 and extends into the wiring operation space 400. There is a gap between the user external terminal 320 and the bottom surface 2C of the arc elimination device.

[0049] The side of the arc extinguishing device 200 away from the circuit breaker body 100 is the outer side surface 2B of the extinguishing device. The lateral position of the outer side surface 2B of the extinguishing device does not exceed the position of the outer end of the user external terminal 320. Here, the outer end of the user external terminal 320 refers to the end thereof away from the circuit breaker body 100.

[0050] Because arcing may occur in the gas exhausted from the circuit breaker body 100, the exhaust passage 210 has at least one bend 213 and is provided with at least one arc extinguishing plate 231. The gas outlet 212 is connected to the outside world for exhausting gas. The gas exhausted from the circuit breaker body 100 passes through the exhaust passage 210. Since at least one bend 213 is provided in the exhaust passage 210, the length of the exhaust passage 210 is not limited to the size of the arc extinguishing device 200 and can be increased, which can greatly enhance the effect of extinguishing arcing.

[0051] Furthermore, the exhaust passage 210 includes at least one Venturi structure unit, which includes an inlet section with a flow cross-sectional area S1, a throat section with a flow cross-sectional area S2, and a diffuser section with a flow cross-sectional area S3, where S1 is greater than S2 and S3 is greater than S2. The Venturi structure unit is based on the principle of the Venturi effect, which states that at the narrowest point of the pipe of the Venturi structure unit, the dynamic pressure (velocity head) of the fluid reaches a maximum value and the static pressure (resting pressure) reaches a minimum value. The velocity of the fluid increases due to the reduction in the flow cross-sectional area. The entire flow undergoes the pipe narrowing process at the same time, so the pressure also decreases at the same time, thereby generating a pressure differential, thereby improving the flow performance of the arcing airflow in the exhaust passage.

[0052] Furthermore, the front end of the bend 213 is connected to a first transition channel and the rear end of the bend 213 is connected to a second transition channel. The flow cross-sectional area of ​​the rear end of the first transition channel is greater than or equal to the flow cross-sectional area of ​​the front end of the bend 213 to which it is connected. The flow cross-sectional area of ​​the front end of the second transition channel is greater than or equal to the flow cross-sectional area of ​​the rear end of the bend 213 to which it is connected. The first transition channel, the bend 213, and the second transition channel connected in sequence along the fluid flow direction constitute a Venturi structural unit, wherein, in the Venturi structural unit, the bend 213 constitutes a throat section with a flow cross-sectional area of ​​S2, and the first transition channel and the second transition channel constitute an inlet section and a diffusion section, respectively.

[0053] Furthermore, both the first and second transition channels are trumpet-shaped channels with a larger cross-sectional area at the front end than at the rear end. The cross-sectional area at the rear end of the first transition channel is equal to the cross-sectional area at the front end of the bend 213 to which it connects. The connecting portion of the first transition channel and the bend 213 has a smooth inner wall. This avoids creating greater resistance to airflow.

[0054] Furthermore, the exhaust passage 210 has at least two bends 213. Of the two adjacent bends 213, the second transition passage connected to the front bend 213 also forms the first transition passage connected to the rear bend 213. The cross-sectional flow area at the front end of the second transition passage is larger than the cross-sectional flow area at the rear end of the connected bend 213. This prevents the flow area of ​​the exhaust passage 210 from becoming increasingly smaller.

[0055] Furthermore, a widening groove 214 is formed at the front end of the second transition channel on one or both sides of the end of the bend 213. By setting the widening groove 214, the flow cross-sectional area at the front end of the second transition channel is suddenly increased without forming resistance to the fluid.

[0056] The arc-extinguishing plate 231 is fixed in the middle of the second transition channel, between its front and rear ends. An arc-extinguishing plate 231 is installed between adjacent bends 213, and several arc-extinguishing plates 231 are installed between the rearmost bend 213 and the gas outlet 212. This arrangement ensures that arcing is completely eliminated before gas is discharged from the gas outlet 212. Specifically, five arc-extinguishing plates 231 are installed between the rearmost bend 213 and the gas outlet 212, spaced at regular intervals.

[0057] Specifically, the arc elimination device 200 includes a cover body 240 and a channel forming block 220. As shown in Figure 8, at least one second installation cavity 241 is provided in the cover body 240 and a second installation opening is provided at its lower end; the channel forming block 220 is adapted to the shape of the second installation cavity 241 and is fixed in the second installation cavity 241. A flow channel groove 221 is provided on one side or both sides of the channel forming block 220. The exhaust channel 210 is formed by the flow channel groove 221 on the side of the channel forming block 220 and the inner wall of the second installation cavity 241 or the inner wall of the second installation cavity 241 and the inner wall of the circuit breaker housing 110. The cover body 240 is respectively provided with a first opening 242 and a second opening 243 corresponding to the air inlet 211 and the air outlet 212 of the exhaust channel 210. In this embodiment, the flow channel groove 221 of the channel forming block 220 is partially exposed outside the cover 240. This portion is inserted into the circuit breaker housing 110 when the arc elimination device 200 is connected to the circuit breaker body 100. This ensures that the channel forming block 220 is not exposed outside the cover 240 and that the corresponding flow channel groove 221 mates with the inner wall of the circuit breaker housing 110. The channel forming block 220 is inserted and installed into the second installation cavity 241 through the second installation opening. A channel forming block 220 having a flow channel groove 221 of a suitable configuration can be selected as needed.

[0058] The arc extinguishing plate 231 is fixed in the flow channel groove 221 of the channel forming block 220. Specifically, at least one set of arc extinguishing plate slots 222 for inserting and installing the arc extinguishing plate 231 is provided on both side walls of the flow channel groove 221. The arc extinguishing plate 231 is fixed in the flow channel groove 221 by plugging.

[0059] The structure of the arc extinguishing plate 231 is shown in FIG12 , and is provided with a plurality of small holes 232 , which serve to segment and cool the arc.

[0060] The length of the base 111 is greater than that of the upper cover 112 , so that the circuit breaker housing 110 forms an arc discharge outlet 115 above the arc extinguishing system 140 and at the tail of the arc extinguishing system 140 . The arc extinguishing device 200 is connected above the base 111 and to the side of the upper cover 112 .

[0061] The circuit breaker body 100 is provided with a rotatable operating handle 131. The operating handle 131 has a swinging path for swinging to drive the operating mechanism 130. The height H1 of the top surface 2A of the arc elimination device relative to the highest point of the step position movement trajectory of the operating handle 131 matches the height H2 of the highest point of the top movement trajectory of the operating handle 131 relative to the highest point of the step position movement trajectory of the operating handle 131.

[0062] Preferably, the range of H1 is 0.1*H2~3*H2, so that the top surface 2A of the arc elimination device is slightly higher than the top surface 1A of the step.

[0063] As the most preferred option, H1 is 1*H2. Taking into account the error, the range of H1 is limited to 0.95*H2~1.05*H2, so as to meet the installation requirements of the arc elimination device without increasing the installation space height of the circuit breaker, and achieve the purpose of product miniaturization under the premise of increasing the airway.

[0064] As shown in FIG3 , the highest point of the exhaust passage 210 in this embodiment is higher than the height of the step top surface 1A and the top surface of the circuit breaker body, so as to fully utilize the height space of the arc elimination device to extend the exhaust passage.

[0065] The cover 240 of the arc elimination device 200 is connected and fixed to the circuit breaker housing 110 by threaded fasteners.

[0066] Specifically, the base 111 is provided with a second wiring support seat 117, one end of which protrudes relative to the upper cover 112 to form at least two first connecting plates 1111, and the second wiring support seat 117 is arranged between two adjacent first connecting plates 1111; the upper cover 112 protrudes at one end close to the second wiring support seat 117 to form at least two second connecting plates 1121, and an arc discharge outlet 115 with an L-shaped opening structure is formed between the two adjacent second connecting plates 1121. As shown in Figure 9, the cover body 240 is provided with a first connecting platform 244 for being fitted and connected to the upper end surface of the first connecting plate 1111, and a second connecting platform 245 for being fitted and connected to the upper end surface of the second connecting plate 1121. The threaded fasteners connecting the cover body 240 and the circuit breaker housing 110 are arranged between the first connecting platform 244 and the first connecting plate 1111 and between the second connecting platform 245 and the second connecting plate 1121.

[0067] The base 111 is provided with at least two second wiring support seats 117 and at least three first connecting plates 1111. A first limiting slot 1112, which is vertically arranged with a larger inner portion and a smaller outer portion, is provided on the outer wall of the first connecting plate 1111 between two adjacent second wiring support seats 117. The housing 240 is provided with a number of second mounting cavities 241, which is equal to the number of second wiring support seats 117, and a number of first connecting platforms 244, which is equal to the number of first connecting plates 1111. The second mounting cavities 241 are located between adjacent first connecting platforms 244. The first connecting platforms 244 between adjacent second mounting cavities 241 protrude downward to form a partition 246. The partition 246 is provided with a first limiting block 247 that engages with the first limiting slot 1112 for a limited position. The partition 246 separates the two adjacent wiring cavities, improving electrical safety. The first limiting block 247 engages with the first limiting slot 1112 for a limited position, facilitating installation.

[0068] The cover body 240 is provided with a first side panel 248 at the outer end of the second connecting platform 245 away from the first connecting platform 244, the lower end surface of the first side panel 248 is in contact with the upper end surface of the upper cover 112, and the lower end surface of the first side panel 248 is provided with a second limiting slot 249, and the upper end surface of the upper cover 112 is provided with a second limiting plug block 1122 which is limitedly plugged into the second limiting slot 249.

[0069] A limiting step 1113 is provided on the inner wall of the first connecting plate 1111 , and the channel forming block 220 is inserted between two adjacent first connecting plates 1111 , with its lower end abutting against the limiting step 1113 for limiting engagement.

[0070] The bottom of the air inlet 211 is positioned no lower than the upper end of the second vertical partition 114. This arrangement creates a connection space for the second conductive connector 124 between the bottom of the channel-forming block 220 and the outer wall of the second vertical partition 114. This completely separates the exhaust channel from the wiring terminals, ensuring safety.

[0071] The terminal extension plate 300 is connected to the second conductive connector 124. The outer end of the terminal extension plate 300 protrudes relative to the outer end of the arc elimination device 200, facilitating connection. Specifically, the terminal extension plate 300 is detachably connected to the second conductive connector 124 by bolts, allowing for various connection configurations as needed.

[0072] Arc extinguishing device 200 is formed by utilizing the space above and at the rear of arc extinguishing system 140, as well as by adding a certain length adjacent to second conductive connector 124. By utilizing the provision of bends 213 and implementing a reasonable spatial layout, the length of exhaust passage 210 within arc extinguishing device 200 can be significantly increased. Taking the structure shown in FIG3 as an example, arc extinguishing device 200 occupies 40 mm of space adjacent to second conductive connector 124, and the height of the upper end of arc extinguishing device 200 is not significantly higher than the height of operating handle 131 shown in the figure. Within the limited space, the provision of six bends 213 fully utilizes this space, resulting in an exhaust passage length increased to 310 mm, equivalent to a more than sevenfold increase in passage length, a significant improvement.

[0073] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A molded case circuit breaker with an arc extinguishing device, comprising a circuit breaker body (100) equipped with an arc extinguishing device (200), characterized in that: The outer side surface (2B) of the arc extinguishing device (200) is arranged to protrude from a first mounting surface (1B) on the side of the circuit breaker body (100); a wiring position for connecting an external line is provided on the first mounting surface (1B); the bottom surface (2C) of the arc extinguishing device is higher than the wiring position, so that a wiring operation space (400) is formed between the bottom surface (2C) of the arc extinguishing device and the first mounting surface (1B).

2. The molded case circuit breaker with an arc elimination device according to claim 1, characterized in that: The circuit breaker body (100) is provided with an arc extinguishing system (140) near the first mounting surface (1B); An arcing space is provided inside the arc elimination device (200); The circuit breaker body (100) is provided with an arc discharge outlet (115) for connecting the arc extinguishing system (140) and the arc discharge space: The arc extinguishing device (200) has an insulating arc extinguishing device bottom surface (2C), and the arc discharge space is electrically isolated from the wiring operation space (400) via the arc extinguishing device bottom surface (2C).

3. The molded case circuit breaker with an arc elimination device according to claim 1, characterized in that: The wiring position is provided with a main body wiring terminal (310) of the circuit breaker body (100) and a user external terminal (320); the user external terminal (320) is connected to the main body wiring terminal (310) and extends into the wiring operation space (400) using the external terminal (320); and a gap is provided between the user external terminal (320) and the bottom surface (2C) of the arc elimination device.

4. The molded case circuit breaker with an arc elimination device according to claim 3, characterized in that: The side of the arc extinguishing device (200) away from the circuit breaker body (100) is the outer side surface (2B) of the extinguishing device, and the horizontal position of the outer side surface (2B) of the arc extinguishing device does not exceed the position of the outer end of the user external terminal (320).

5. The molded case circuit breaker with an arc elimination device according to claim 1, characterized in that: The arc elimination device (200) comprises a cover body (240), wherein at least one exhaust channel (210) is provided in the cover body (240), the exhaust channel (210) has an air inlet (211) and an air outlet (212), and at least one bend (213) is provided between the air inlet (211) and the air outlet (212).

6. The molded case circuit breaker with an arc elimination device according to claim 1, characterized in that: The arc elimination device (200) comprises a cover body (240), wherein at least one exhaust channel (210) is provided in the cover body (240), wherein the exhaust channel (210) has an air inlet (211) and an air outlet (212), and between the air inlet (211) and the air outlet (212) there is provided at least one upward channel unit having an upward air guiding tendency and at least one downward channel unit having a downward air guiding tendency.

7. The molded case circuit breaker with an arc elimination device according to claim 5, characterized in that: The arc elimination device (200) comprises a cover (240), wherein at least one exhaust channel (210) is provided in the cover (240), the exhaust channel (210) has an air inlet (211) and an air outlet (212), and the height of the highest point of the exhaust channel (210) is higher than the height of the top surface of the circuit breaker body.

8. A molded case circuit breaker with an arc elimination device according to any one of claims 1 to 7, characterized in that: A rotatable operating handle (131) is provided on the circuit breaker body (100), and the operating handle (131) has a swinging path for swinging to drive the operating mechanism (130) to operate. The height H1 of the top surface (2A) of the arc elimination device relative to the highest point of the step position motion trajectory of the operating handle (131) matches the height H2 of the highest point of the top motion trajectory of the operating handle (131) relative to the highest point of the step position motion trajectory of the operating handle (131).

9. The molded case circuit breaker with an arc elimination device according to claim 8, characterized in that: The range of H1 is 0.1*H2~3*H2.

10. The molded case circuit breaker with an arc elimination device according to claim 9, characterized in that: The range of H1 is 0.95*H2~1.05*H2.

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