Leakage protection circuit breaker

Abstract

A leakage protection circuit breaker comprises a circuit breaker and a handle, an operating mechanism, an overload protection unit and a short-circuit protection unit arranged in a housing of the circuit breaker, and further comprises a leakage protection unit. The leakage protection unit and the short-circuit protection unit are arranged on one side of the operating mechanism corresponding to the operating mechanism, and the overload protection unit is arranged on the other side of the operating mechanism. The leakage protection unit comprises a mutual inductor and a release, and the mutual inductor is arranged below the short-circuit protection unit. By arranging the mutual inductor of the leakage protection unit below the short-circuit protection unit, not only can the function of increasing leakage protection be achieved on the basis of ensuring the current carrying capacity and the space size, but also the structure is simple, and the manufacturing cost can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, in particular to a leakage protection circuit breaker. Background Art

[0002] Leakage protection circuit breakers are widely used in industries, commerce, residential areas, etc. When leakage, overload, or short circuit occurs in the line, the leakage protection circuit breaker can quickly cut off the faulty power supply within a very short time to protect the safety of people and electrical equipment. Existing leakage protection circuit breakers can usually be divided into three categories:

[0003] (1) Assembled leakage protection circuit breaker: It is composed of a circuit breaker with overload and short-circuit protection and a leakage protection module, but it takes up a large space and is costly;

[0004] (2) Leakage protection circuit breaker without protective pole: With the trend of miniaturization of circuit breakers, the existing technology sets the leakage protection module in the N-pole circuit breaker without protective pole. The circuit breaker pole without protective pole only has a disconnectable breakpoint and does not have overload and short-circuit protection functions. There are certain safety hazards to line protection and it cannot meet user needs.

[0005] (3) Leakage protection circuit breaker with protective pole: The leakage protection module is set in the circuit breaker with protective pole to increase the leakage protection function. In order to meet the existing modular size, the leakage protection module is usually set between the circuit breaker's wiring terminal and the short-circuit protection unit, or between the wiring terminal and the overload protection unit. In order to meet the installation position requirements of the leakage protection module, it is often necessary to increase the casing length, which brings certain technical bottlenecks to adding leakage protection function to the circuit breaker. Invention content

[0006] The purpose of the invention is to overcome the defects of the prior art and provide a leakage protection circuit breaker with a protective pole, simple structure and high reliability.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A leakage protection circuit breaker includes a circuit breaker and a handle 110, an operating mechanism 120, an overload protection unit 140 and a short circuit protection unit 150 arranged in a housing of the circuit breaker, and also includes a leakage protection unit. The leakage protection unit and the short circuit protection unit 150 are arranged on one side of the operating mechanism 120 corresponding to the operating mechanism 120, and the overload protection unit 140 is arranged on the other side of the operating mechanism 120. The leakage protection unit includes a mutual inductor 210 and a release 220, and the mutual inductor 210 is arranged below the short circuit protection unit 150.

[0009] Optionally, it includes a plurality of circuit breakers arranged in parallel, the plurality of circuit breakers are connected via a linkage mechanism, a leakage protection unit is arranged in the housing of one of the circuit breakers, and the main circuit wires of all the circuit breakers pass through the mutual inductor 210 of the leakage protection unit.

[0010] Optionally, a testing mechanism is provided in the housing of one of the circuit breakers, the testing mechanism comprising a testing button 310, a testing spring 320 and a conductive plate 330, the testing button 310 is arranged between the operating mechanisms 120 of the two circuit breakers, the testing spring 320 and the conductive plate 330 are arranged at intervals, the testing button 310 and one end of the testing spring 320 are arranged relative to each other and can drive one end of the testing spring 320 to contact one end of the conductive plate 330 to conduct the testing circuit, the testing circuit passes through the mutual inductor 210, and the other ends of the testing spring 320 and the conductive plate 330 are respectively connected to the main circuits of two different circuit breakers, and the connection points of the testing spring 320 and the conductive plate 330 with the main circuits of their respective circuit breakers are respectively located at the front end and the rear end of the mutual inductor 210.

[0011] Optionally, a cylindrical coil frame is provided in the shell, and the short-circuit protection unit 150 includes a short-circuit protection coil 153 sleeved on the outside of the coil frame, and a short-circuit protection iron core 154 arranged on the inside of the coil frame and cooperating with the short-circuit protection coil 153 and a push rod 155 cooperating with the short-circuit protection iron core 154. When a short circuit occurs, the short-circuit protection coil 153 drives the short-circuit protection iron core 154 to drive the push rod 155 to push the operating mechanism 120 to unlock; the release 220 includes a short-circuit protection coil sleeved on the outside of the coil frame, and a short-circuit protection iron core 154 arranged on the inside of the coil frame and cooperating with the short-circuit protection coil 153. The leakage protection coil 222 is outside the skeleton and is located on one side of the short-circuit protection coil 153, and the intermediate iron core 223 is arranged on the inner side of the coil skeleton. The intermediate iron core 223 cooperates with the leakage protection coil 222 and the push rod 155. The middle part of the push rod 155 is limited by the intermediate iron core 223 and one end passes through the intermediate iron core 223 and is connected to the short-circuit protection core 154. When leakage occurs, the leakage protection coil 222 drives the intermediate iron core 223 to drive the push rod 155 to push the operating mechanism 120 to unlock.

[0012] Optionally, a static contact 170 and a moving contact 160 are arranged opposite to each other in the housing, the moving contact 160 is connected to the operating mechanism 120 , and an arc extinguishing mechanism 180 cooperating with the static contact 170 is provided on one side of the transformer 210 .

[0013] Optionally, the arc extinguishing mechanism 180 is disposed on a side of the transformer 210 close to the static contact 170 and correspondingly disposed below the static contact 170 , and the arc extinguishing mechanism 180 is inclined and disposed opposite to the moving contact 160 .

[0014] Optionally, the leakage protection coil 222 is arranged on the right side of the short-circuit protection coil 153, the intermediate iron core 223 is cylindrical and the intermediate iron core 223 is sleeved on the push rod 155, and a push rod baffle 1551 is provided on the circumference of the push rod 155 for cooperating with the right end face of the intermediate iron core 223, the right end of the intermediate iron core 223 extends to the inner side of the leakage protection coil 222 and cooperates with one end of the leakage protection coil 222, the left end of the intermediate iron core 223 extends to the inner side of the short-circuit protection coil 153 and cooperates with one end of the short-circuit protection coil 153, and the left end of the intermediate iron core 223 is spaced apart from the short-circuit protection iron core 154, and the coil skeleton is provided with a short-circuit protection baffle 1511 for limiting the intermediate iron core 223 correspondingly between the intermediate iron core 223 and the short-circuit protection iron core 154.

[0015] Optionally, a leakage protection iron core 224 extending to the inner side of the leakage protection coil 222 is provided in the coil frame, a leakage protection spring 2242 is provided between the intermediate iron core 223 and the leakage protection iron core 224, and a leakage push rod hole 2243 for avoiding the push rod 155 is provided in the middle of the leakage protection iron core 224; the cross section of the coil frame is H-shaped, and the short-circuit protection baffle 1511 divides the cavity inside the coil frame into a leakage protection cavity 1 51b and the short-circuit protection cavity 151a, the short-circuit protection baffle 1511 is provided with a baffle push rod hole 1512 for allowing the push rod 155 to pass through; the leakage protection iron core 224 is arranged in the leakage protection cavity 151b and is located at an end away from the short-circuit protection baffle 1511, the short-circuit protection iron core 154 is arranged in the short-circuit protection cavity 151a, and a short-circuit protection spring 1542 is provided between one end of the short-circuit protection iron core 154 and the short-circuit protection baffle 1511.

[0016] Optionally, a yoke 151 for fixing the coil skeleton is provided in the shell, and the yoke 151 is U-shaped. The short-circuit protection coil 153 is arranged on the inner side of the yoke 151, and the leakage protection coil 222 is arranged on the outer side of the yoke 151. Correspondingly, a static contact 170 fixedly connected to the yoke 151 is provided below the leakage protection coil 222, and the static contact 170 is electrically connected to one end of the short-circuit protection coil 153. A moving contact 160 arranged opposite to the static contact 170 is provided at the bottom of the operating mechanism 120, a wiring terminal 130 electrically connected to the other end of the short-circuit protection coil 153 is provided on the left side of the shell, and a wiring terminal 130 electrically connected to the moving contact 160 is provided on the right side of the shell.

[0017] Optionally, the yoke 151 includes a first yoke plate 1514 and a second yoke plate 1515 that are arranged opposite to each other, and a yoke connecting plate 1513 connected between the first yoke plate 1514 and the second yoke plate 1515. The coil frame includes a short-circuit protection bracket 152 that cooperates with the short-circuit protection coil 153, and a leakage protection bracket 221 that cooperates with the leakage protection coil 222. The short-circuit protection bracket 152 is arranged between the first yoke plate 1514 and the second yoke plate 1515, and the leakage protection bracket 221 is arranged on the outside of the yoke 151. A first baffle 2111 and a second baffle 2112 that cooperate with the leakage protection coil 222 are respectively provided at both ends of the leakage protection bracket 221. The first baffle 2111 cooperates with the outside of the second yoke plate 1515, and a connecting claw 2114 that is L-shaped and inverted on the top side of the second yoke plate 1515 is provided on the top side of the first baffle 2111.

[0018] Optionally, the yoke 151 includes a first yoke plate 1514 and a second yoke plate 1515 that are relatively arranged, and a yoke connecting plate 1513 connected between the first yoke plate 1514 and the second yoke plate 1515, and the short-circuit protection bracket 152 is arranged on the inner side of the first yoke plate 1514 and the second yoke plate 1515, and a yoke extension plate 1518 extending toward the front is provided on the side of the yoke connecting plate 1513, and the yoke extension plate 1518 extends toward the bottom of the leakage protection bracket 221 at one end close to the second yoke plate 1515 and is fixedly connected to the static contact 170.

[0019] Optionally, the first yoke plate 1514 and the second yoke plate 1515 are respectively provided with a first yoke limit opening 15140 and a second yoke limit opening 15150 that cooperate with the outer circumference of the two ends of the short-circuit protection bracket 152, and openings slightly smaller than the diameter of the short-circuit protection bracket 152 are respectively provided on one side of the first yoke limit opening 15140 and the second yoke limit opening 15150, and the left and right ends of the short-circuit protection bracket 152 can respectively pass through the openings and be inserted into the first yoke limit opening 15140 and the second yoke limit opening 15150 for fixation, and a step groove 1516 that abuts against the inner side of the second yoke plate 1515 is provided at the right end of the short-circuit protection bracket 152, and an abutment plate 1519 that abuts against the inner side of the first yoke plate 1514 and a connecting foot 1517 that cooperates with the side of the first yoke plate 1514 are provided at the left end of the short-circuit protection bracket 152.

[0020] Optionally, the coil skeleton is provided with a limit piece 156 cooperating with the short-circuit protection core 154 at one end away from the leakage protection core 224, the limit piece 156 includes a ring-shaped limit plate 1561, a limit cylinder 1562 sleeved on the outer side of the coil skeleton is provided on the circumference of the limit plate 1561, and at least one group of locking mechanisms is provided on the limit cylinder 1562, each group of locking mechanisms includes two limit grooves 1563 relatively arranged on both sides of the limit cylinder 1562, and respectively provided A locking claw 1564 is arranged on one side of the limiting groove 1563, one end of the locking claw 1564 is fixedly connected to one end of the limiting groove 1563, and the other end is spaced apart from the other end of the limiting groove 1563 to form a locking entrance 1565, and at least two locking blocks 1566 corresponding to the limiting groove 1563 are arranged on the outer circumference of the coil skeleton, and the locking block 1566 can pass through the locking entrance 1565 and be stuck between the limiting groove 1563 and the locking claw 1564.

[0021] Optionally, the push rod 155 includes an outer push portion 1552 that cooperates with the leakage protection core 224, and an inner push portion 1553 that cooperates with the intermediate core 223 and the short-circuit protection core 154. The outer push portion 1552 is T-shaped, and includes an outer push plate 1554 that is arranged on the outer side of the leakage protection core 224 and directly contacts and cooperates with the operating mechanism 120, and an outer push rod 1555 connected to the inner push portion 1553. The leakage protection core 224 is sleeved on the outer side of the outer push rod 1555. The middle part of the left end of the outer push rod 1555 is axially provided with a push plate that is in contact with the inner push plate 1554. The moving part 1553 cooperates with the outer push rod hole 1556, and the leakage protection spring 2242 is sleeved on the outside of the outer push rod 1555. One end of the inner push part 1553 cooperates with the short-circuit protection iron core 154, and the other end is provided with a push rod baffle 1551 that cooperates with the middle iron core 223. The push rod baffle 1551 is provided with an inner push rod shaft 1557 that extends into the outer push rod hole 1556 and cooperates. A locking ring 1158 is provided on the circumference of the inner push rod shaft 1557, and a locking groove 1559 that cooperates with the locking ring 1158 is provided on the inner wall of the outer push rod hole 1556.

[0022] Optionally, the operating mechanism 120 includes a rocker arm 121 pivotally mounted in the housing, a lock catch 122 and a trip catch 123 pivotally mounted on the rocker arm 121, and a connecting rod 125 connected between the rocker arm 121 and the handle 110, the handle 110 is pivotally mounted in the housing, the moving contact 160 is arranged on the rocker arm 121, and the rocker arm 121 is connected to the housing through an energy storage spring, and a pull rod 124 is provided on the trip catch 123 to cooperate with the bimetallic strip 141 of the overload protection unit 140. When the lock catch 122 is buckled with the trip catch 123, When in cooperation, the handle 110 can drive the rocker arm 121 to overcome the force of the energy storage spring to drive the moving contact 160 to contact the static contact 170. The bimetallic strip 141 can bend when overloaded and pull the trip buckle 123 and the lock buckle 122 through the pull rod 124 to release the buckle cooperation, so that the rocker arm 121 drives the moving contact 160 to separate from the static contact 170. The short-circuit protection unit 150 and the leakage protection unit can respectively push the rocker arm 121 through the push rod 155 to drive the moving contact 160 to separate from the static contact 170 in the event of short circuit and leakage, so as to trip the circuit breaker.

[0023] Optionally, a yoke 151 for fixing the short-circuit protection unit 150 is provided in the shell, and the static contact 170 is connected to the yoke 151 through a contact plate 171, the contact plate 171 is U-shaped, the static contact 170 is arranged in the middle of the contact plate 171, and the side edge of one side of the contact plate 171 is fixedly connected to the yoke 151, and a first arc-starting plate 181 is provided on the side edge of the other side of the contact plate 171 and extends downwardly and obliquely to one side of the arc extinguishing mechanism 180.

[0024] Optionally, a second arc-striking plate 182 is provided on one side of the arc extinguishing mechanism 180, and the second arc-striking plate 182 is V-shaped, including an arc-striking plate 183 arranged on both sides of the arc extinguishing mechanism 180 opposite to the first arc-striking plate 181, a fixed plate 184 fixedly connected to the bimetallic plate 141 of the overload protection unit 140, and an isolating plate 185 connected to one end of the arc-striking plate 183 and the fixed plate 184, and the isolating plate 185 extends below the moving contact 160 to between the static contact 170 and the bimetallic plate 141.

[0025] Optionally, the isolation plate 185 is U-shaped, the inner sides of the two side edges thereof are fitted together, and the ends are fixedly connected to the arc-starting plate 183 and the fixing plate 184 respectively.

[0026] Optionally, the fixing plate 184 is S-shaped, with a plug pin on one end and a plug slot 1860 on the shell for plugging with the plug pin. The other end of the fixing plate 184 is bent toward a side away from the isolation plate 185 and fixedly connected to the bimetallic strip 141 .

[0027] The leakage protection circuit breaker created by the present invention can not only realize the function of increasing leakage protection on the basis of ensuring the current carrying capacity and space size by placing the mutual inductor 210 of the leakage protection unit under the short-circuit protection unit 150, but also has the characteristics of simple structure, which can effectively reduce the cost of production. In addition, by extending one end of the intermediate iron core 223 to the inner side of the short-circuit protection coil 153 to cooperate with the short-circuit protection coil 153, and extending the right end of the intermediate iron core 223 to the inner side of the leakage protection coil 222 to cooperate with the leakage protection coil 222, the intermediate iron core 223 can play a role equivalent to the static iron core in short-circuit protection, and can play a role equivalent to the moving iron core in leakage protection, killing two birds with one stone, with ingenious design, few parts, compact structure and small space occupation. In addition, by arranging the test mechanism between the operating mechanisms 120 of two adjacent circuit breakers, it has the characteristics of simple structure and small space occupation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a circuit breaker provided with a leakage protection unit created by the present invention;

[0029] Figure 2 This invention is Figure 1 A front view of

[0030] Figure 3 It is a cross-sectional view of a short-circuit protection unit and a leakage protection unit created by the present invention;

[0031] Figure 4 It is a structural schematic diagram of a short circuit protection unit and a leakage protection unit created by the present invention;

[0032] Figure 5 This invention is Figure 4 A partial enlarged view of

[0033] Figure 6 It is a structural schematic diagram of the testing mechanism created by the present invention. DETAILED DESCRIPTION

[0034] The following is combined with Figures 1 to 6 The following embodiments are provided to further illustrate the specific implementation of the leakage protection circuit breaker created by the present invention. The leakage protection circuit breaker created by the present invention is not limited to the description of the following embodiments.

[0035] like Figure 1-2As shown, it includes two circuit breakers connected to different power phase lines, and the two circuit breakers are spliced ​​together. Each circuit breaker includes a housing and a handle 110, an operating mechanism 120, a wiring terminal 130, an overload protection unit 140, a short circuit protection unit 150, a moving contact 160, a static contact 170, and a linkage mechanism connected between the two circuit breakers. The linkage mechanism (not shown in the figure) passes through the housing of the circuit breaker and is connected between the handles 110 or the operating mechanisms 120 of the two circuit breakers. The circuit breaker is connected through the wiring terminal 130 The corresponding phase lines are respectively connected, and the handle 110 can drive the operating mechanism 120 to drive the moving contact 160 to contact the static contact 170 to close the corresponding phase line. When the connected phase line is overloaded or short-circuited, the overload protection unit 140 and the short-circuit protection unit 150 can respectively unlock the operating mechanism 120 to trip the circuit breaker, release energy through the operating mechanism 120 and drive the moving contact 160 to separate from the static contact 170 to disconnect the corresponding phase line, and drive other circuit breakers to trip through the linkage mechanism to achieve overload and short-circuit protection of disconnecting all phase lines.

[0036] A leakage protection unit is provided in any of the above two circuit breakers, a handle 110 is provided on the top of the housing, a short circuit protection unit 150 is provided below the handle 110, the leakage protection unit and the short circuit protection unit 150 are provided on one side of the operating mechanism 120 corresponding to the operating mechanism 120, and the overload protection unit 140 is provided on the other side of the operating mechanism 120, the leakage protection unit includes a circuit board (not shown in the figure) and a mutual inductor 210 and a tripper 220 respectively connected to the circuit board, and the mutual inductor 210 is provided Below the short-circuit protection unit 150, the mutual inductor 210 includes a ring-shaped magnet and a winding wound on the magnet. The current loops of all circuit breakers pass through the center of the magnet of the mutual inductor 210 through wires. When leakage occurs in the main circuit of any circuit breaker, the winding of the mutual inductor 210 can detect the leakage signal and transmit it to the circuit board. Then the tripper 220 unlocks the operating mechanism 120 to trip the circuit breaker with the leakage protection unit. At the same time, the circuit breaker trips the circuit breaker without the leakage protection unit through the linkage mechanism. Of course, three or four circuit breakers can also be set to protect the three or four phases of the power supply respectively, which all belong to the protection scope of the invention.

[0037] like Figure 2 An implementation of the leakage protection unit is shown, wherein the mutual inductor 210 is horizontally placed below the short-circuit protection unit 150, and the axis of the magnet of the mutual inductor 210 is arranged parallel to the thickness direction of the housing of the circuit breaker, which has the characteristics of high reliability and space saving.

[0038] Furthermore, a yoke 151 for fixing the short-circuit protection unit 150 is provided in the housing. The yoke 151 divides the side of the housing away from the short-circuit protection unit 150 into a transformer cavity for accommodating the transformer 210. The transformer cavity is square, and a wire cavity 2100 for avoiding and guiding is formed between the transformer 210 and the top corner of the transformer cavity. Figure 2 As shown, two wires are respectively provided at the upper left corner and the lower left corner of the transformer 210, and the two wires are respectively connected to the main circuits of the two circuit breakers. Of course, if three or four circuit breakers are provided, the main circuit of each circuit breaker passes through the transformer 210 through the wire, and the wire can pass between the transformer 210 and other top corners of the transformer cavity, which all belong to the protection scope of the invention.

[0039] The leakage protection circuit breaker created by the present invention is also provided with an arc extinguishing mechanism 180, which cuts and extinguishes the arc drawn when the moving contact 160 and the static contact 170 are separated by the arc extinguishing grid, so as to improve the reliability of the circuit breaker. Of course, the arc extinguishing mechanism 180 may not be provided, because for Figure 2 For the two-pole circuit breaker shown, when the voltage of 230V is applied to the two-pole circuit breaker, it is equivalent to a double-breakpoint circuit breaker. Even if the arc extinguishing mechanism 180 is not provided, the arc extinguishing capacity has a large margin, which can fully meet the existing market demand. If it is a four-pole circuit breaker, the arc extinguishing capacity will be reduced, and the arc extinguishing mechanism 180 can be added directly below the static contact 170 according to the breaking capacity requirements. In addition, the circuit breaker with the leakage protection unit is preferably set at the N pole, especially when the contact system of the N pole has the characteristics of first closing and then breaking, the arc extinguishing capacity of the circuit breaker is less demanded, and whether the arc extinguishing mechanism 180 is provided has basically no effect.

[0040] like Figure 2 An implementation of the arc extinguishing mechanism 180 is shown, in which the arc extinguishing mechanism 180 is provided on one side of the mutual inductor 210 close to the static contact 170 and correspondingly below the static contact 170. The arc extinguishing mechanism 180 is inclined and arranged opposite to the moving contact 160. By arranging the arc extinguishing mechanism 180, the arc extinguishing ability of the circuit breaker can be effectively improved. Of course, the arc extinguishing mechanism 180 can also be arranged on the other side of the mutual inductor 210, all of which belong to the protection scope of the invention.

[0041] Furthermore, the static contact 170 is connected to the yoke 151 through a contact plate 171, the contact plate 171 is U-shaped, the static contact 170 is arranged on the outside of the middle of the contact plate 171, the side edge of one side of the contact plate 171 is correspondingly arranged below the releaser 220 of the leakage protection unit and fixedly connected to the yoke 151, and the side edge of the other side of the contact plate 171 is provided with a first arc-starting plate 181 that extends downwardly and obliquely to one side of the arc extinguishing mechanism 180.

[0042] Furthermore, a second arc-striking plate 182 is provided on the other side of the arc-extinguishing mechanism 180, and the second arc-striking plate 182 is V-shaped, and includes arc-striking pieces 183 arranged on both sides of the arc-extinguishing mechanism 180 opposite to the first arc-striking plate 181, a fixing piece 184 fixedly connected to the bimetallic piece 141 of the overload protection unit 140, and an isolating piece 185 connected to one end of the arc-striking piece 183 and the fixing piece 184, and the isolating piece 185 extends below the moving contact 160 to between the static contact 170 and the bimetallic piece 141. The isolating piece 185 is preferably U-shaped, the inner sides of the two side edges thereof are mutually attached, and the ends are fixedly connected to the arc-striking piece 183 and the fixing piece 184, respectively.

[0043] Furthermore, the fixing plate 184 is preferably S-shaped, with a plug-in pin (not shown in the figure) on one end, and a plug-in groove 1860 that cooperates with the plug-in pin is provided on the shell. The other end of the fixing plate 184 is bent toward the side away from the isolation plate 185 and fixedly connected to the bimetallic strip 141. The fixing plate 184 and the second arc-guiding plate 182 are plugged into the shell through the plug-in pin, which not only makes assembly more convenient, but also the bimetallic strip 141 and the second arc-guiding plate 182 can be pre-assembled as a whole outside the shell and then installed into the shell together, which can further reduce the difficulty of assembly.

[0044] As another implementation of the arc extinguishing mechanism 180 (not shown in the figure), the arc extinguishing mechanism 180 and the transformer 210 are both located below the short-circuit protection unit 150, and the arc extinguishing mechanism 180 and the transformer 210 are stacked along the thickness direction of the shell of the circuit breaker, both of which belong to the protection scope of the invention.

[0045] like Figure 3-4 In the embodiment of the present invention, the tripping device 220 of the leakage protection unit is arranged on one side of the short circuit protection unit 150, located on the short circuit protection unit 150 and arranged opposite to the tripping position of the operating mechanism 120. Figure 3-4 An embodiment of the short-circuit protection unit 150 is shown. The short-circuit protection unit 150 includes a cylindrical coil frame, a short-circuit protection coil 153 sleeved on the outside of the coil frame, a short-circuit protection iron core 154 arranged on the inside of the coil frame and matched with the short-circuit protection coil 153, and a push rod 155 matched with the short-circuit protection iron core 154. When a short circuit occurs, the short-circuit protection coil 153 drives the short-circuit protection iron core 154 to drive the push rod 155 to push the operating mechanism 120 to unlock. The releaser 220 includes a leakage protection coil 222 sleeved on the outside of the coil frame and located on one side of the short-circuit protection coil 153, and an intermediate iron core 223 arranged on the inside of the coil frame. The intermediate iron core 223 cooperates with the leakage protection coil 222 and the push rod 155. When a leakage occurs, the leakage protection coil 222 drives the intermediate iron core 223 to drive the push rod 155 to push the operating mechanism 120 to unlock. The releaser 220 of the leakage protection unit shares the push rod 155 with the short-circuit protection unit 150.

[0046] Furthermore, the leakage protection coil 222 is arranged on the right side of the short-circuit protection coil 153, the intermediate iron core 223 is cylindrical and the intermediate iron core 223 is sleeved on the push rod 155, and a push rod baffle 1551 is provided on the circumference of the push rod 155 to cooperate with the right end face of the intermediate iron core 223, the right end of the intermediate iron core 223 extends to the inner side of the leakage protection coil 222 and cooperates with one end of the leakage protection coil 222, the left end of the intermediate iron core 223 extends to the inner side of the short-circuit protection coil 153 and cooperates with one end of the short-circuit protection coil 153, and the left end of the intermediate iron core 223 is spaced apart from the short-circuit protection iron core 154, and the coil skeleton is provided with a short-circuit protection baffle 1511 for limiting the intermediate iron core 223 correspondingly between the intermediate iron core 223 and the short-circuit protection iron core 154. By extending one end of the middle iron core 223 to the inner side of the short-circuit protection coil 153 and cooperating with the short-circuit protection coil 153, and extending the right end of the middle iron core 223 to the inner side of the leakage protection coil 222 and cooperating with the leakage protection coil 222, the middle iron core 223 can play a role equivalent to that of a static iron core during short-circuit protection, and can also play a role equivalent to that of a moving iron core during leakage protection.

[0047] Specifically, a U-shaped yoke 151 and a coil frame arranged on the yoke 151 are provided in the housing of the circuit breaker. The releaser 220 is arranged between the short-circuit protection unit 150 and the operating mechanism 120. The coil frame includes a short-circuit protection bracket 152 arranged on the inner side of the yoke 151 and cooperating with the short-circuit protection unit 150, and a leakage protection bracket 221 arranged on the outside of the right side of the yoke 151 and cooperating with the releaser 220. The static contact 170 is correspondingly arranged below the leakage protection bracket 221 and fixedly connected to the yoke 151.

[0048] The short-circuit protection bracket 152 is cylindrical, and the two ends of the outer side of the short-circuit protection bracket 152 are respectively connected to the two side edges of the yoke 151. The short-circuit protection unit 150 includes a short-circuit protection coil 153 arranged in the middle of the outer side of the short-circuit protection bracket 152, and a short-circuit protection iron core 154 arranged on the inner side of the short-circuit protection bracket 152 and cooperating with the short-circuit protection coil 153, and a push rod 155 cooperating with the short-circuit protection iron core 154. One end of the short-circuit protection coil 153 is connected to the wiring terminal 130 on the left side of the circuit breaker through a wire, and the other end is connected to the static contact 170. The moving contact 160 is arranged on the operating mechanism 120 and connected to the wiring terminal 130 on the right side of the circuit breaker. When the moving contact 160 contacts the static contact 170, a current loop corresponding to the connected phase line is formed between the two terminal blocks 130, and the current flows back through the short-circuit protection coil 153. When the short-circuit current passes through the short-circuit protection coil 153, the short-circuit protection coil 153 generates an electromagnetic force to drive the short-circuit protection iron core 154. The short-circuit protection iron core 154 pushes the operating mechanism 120 to unlock through the push rod 155 to achieve tripping.

[0049] As an implementation of the leakage protection unit, the releaser 220 of the leakage protection unit is arranged on the short-circuit protection unit 150 and cooperates with the operating mechanism 120. When leakage current occurs, the releaser 220 drives the push rod 155 to push the operating mechanism 120 to release to achieve tripping.

[0050] Specifically, the coil skeleton includes a leakage protection bracket 221 arranged on the outside of the right part of the yoke 151 and matched with the release 220, the leakage protection bracket 221 is cylindrical and sleeved on the outside of the push rod 155, the release 220 includes a leakage protection coil 222 arranged on the outside of the leakage protection bracket 221, and an intermediate iron core 223 arranged on the inside of the leakage protection bracket 221, the intermediate iron core 223 cooperates with the leakage protection coil 222 and the push rod 155 at the same time, the leakage protection coil 222 is connected to the mutual inductor 210, when the leakage current occurs, the leakage protection coil 222 generates an electromagnetic force to drive the intermediate iron core 223 to drive the push rod 155 to push the operating mechanism 120 to unlock to achieve tripping. Of course, the release 220 may not be integrated on the short-circuit protection unit 150, and a rod structure for pushing the operating mechanism 120 to unlock may be separately set, or it may not be set between the short-circuit protection unit 150 and the operating mechanism 120, all of which belong to the protection scope of the invention.

[0051] Furthermore, the intermediate core 223 is cylindrical, and an intermediate push rod hole 2231 cooperating with the push rod 155 is axially arranged in the middle of the intermediate core 223. The push rod 155 passes through the intermediate push rod hole 2231 and can slide axially relative to the intermediate core 223. The short-circuit protection coil 153 and the leakage protection coil 222 are respectively arranged on the left and right sides.

[0052] The left end of the middle iron core 223 extends to the inner side of the short-circuit protection coil 153 and cooperates with the right end of the short-circuit protection coil 153. The short-circuit protection iron core 154 cooperates with the left end of the short-circuit protection coil 153. The left end of the middle iron core 223 is spaced apart from the short-circuit protection iron core 154. The short-circuit protection bracket 152 is provided with a short-circuit protection baffle 1511 for limiting the middle iron core 223 corresponding to the middle iron core 223 and the short-circuit protection iron core 154. A baffle push rod hole 1512 for avoiding the push rod 155 is provided in the middle of the short-circuit protection baffle 1511. The push rod 155 passes through the baffle push rod hole 1512 and cooperates with the right side of the short-circuit protection iron core 154. Since the left end of the middle iron core 223 extends to the inner side of the short-circuit protection coil 153, the middle iron core 223 can generate an electromagnetic force under the action of the short-circuit protection coil 153 to attract the short-circuit protection iron core 154 together with the short-circuit protection coil 153. At this time, the middle iron core 223 is blocked by the short-circuit protection baffle 1511 and cannot move toward the short-circuit protection iron core 154. The middle iron core 223 is equivalent to the static iron core of the short-circuit protection iron core 154. The short-circuit protection iron core 154 is between the middle iron core 223 and the short-circuit protection coil 153. The electromagnetic force of the coil 153 drives the push rod 155 to unlock the operating mechanism 120; at the same time, the right end of the middle iron core 223 extends to the inner side of the leakage protection coil 222 and cooperates with the left end of the leakage protection coil 222. The circumference of the push rod 155 is provided with a push rod baffle 1551 that cooperates with the right end face of the middle iron core 223. When the leakage protection coil 222 attracts the middle iron core 223 to move rightward, the push rod 155 drives the push rod 155 to unlock the operating mechanism 120 through the push rod baffle 1551. Preferably, the edge of the right end of the middle push rod hole 2231 of the middle iron core 223 is provided with a push rod baffle groove 2232 for accommodating the push rod baffle 1551. The push rod baffle groove 2232 can form a limited fit between the middle iron core 223 and the push rod 155 without increasing the volume of the middle iron core 223 and the push rod 155, thereby improving the reliability of the action.

[0053] In the present embodiment, by extending one end of the middle iron core 223 to the inner side of the short-circuit protection coil 153 and cooperating with the short-circuit protection coil 153, and extending the right end of the middle iron core 223 to the inner side of the leakage protection coil 222 and cooperating with the leakage protection coil 222, the middle iron core 223 can play a role equivalent to a static iron core in short-circuit protection, and can also play a role equivalent to a moving iron core in leakage protection. It kills two birds with one stone and has an ingenious design. It not only has the characteristics of high sensitivity, fast action speed and high reliability, but also has a compact structure and occupies little space.

[0054] Furthermore, the right end of the middle iron core 223 extends to the inner side of the leakage protection coil 222 and cooperates with the left end of the leakage protection coil 222. A leakage protection iron core 224 cooperating with the right end of the leakage protection coil 222 is provided at the right end of the leakage protection bracket 221. The leakage protection iron core 224 is fixedly connected to the leakage protection bracket 221 and is spaced apart from the middle iron core 223. A leakage protection spring groove 2241 is provided in the middle of the leakage protection iron core 224. A leakage protection spring 2242 is provided in the leakage protection spring slot 2241 and is sleeved on the push rod 155. One end of the leakage protection spring 2242 abuts against the push rod baffle 1551 on the circumference of the push rod 155, and the other end abuts against the bottom of the leakage protection spring slot 2241. A leakage push rod hole 2243 for avoiding the push rod 155 is provided at the bottom of the leakage protection spring slot 2241. The push rod 155 passes through the leakage push rod hole 2243 and extends to one side of the operating mechanism 120. The leakage protection iron core 224 can generate an electromagnetic force to attract the middle iron core 223 under the action of the leakage protection coil 222, so as to increase the moving speed of the push rod 155 during leakage protection and ensure reliability. After the circuit breaker trips, the leakage protection spring 2242 drives the push rod 155 and the middle iron core 223 to reset. Of course, the leakage protection spring groove 2241 may not be provided, and the leakage protection spring 2242 may directly abut against the outer edge of the leakage push rod hole 2243, which also falls within the protection scope of the present invention. Of course, in a leakage protection unit without a release 220, a static iron core cooperating with the push rod 155 and the short-circuit protection coil 153 may be provided on the end of the short-circuit protection bracket 152 away from the limiter 156 to replace the role of the intermediate iron core 223 in short-circuit protection, which is not specifically limited here.

[0055] Furthermore, the yoke 151 includes a first yoke plate 1514 and a second yoke plate 1515 that are arranged opposite to each other, and a yoke connecting plate 1513 connected between the first yoke plate 1514 and the second yoke plate 1515. The short-circuit protection bracket 152 is arranged on the inner sides of the first yoke plate 1514 and the second yoke plate 1515. A yoke extension plate 1518 extending toward the front is provided on the side of the yoke connecting plate 1513. One end of the yoke extension plate 1518 close to the second yoke plate 1515 extends toward the bottom of the leakage protection bracket 221 and is fixedly connected to the static contact 170.

[0056] The first yoke plate 1514 and the second yoke plate 1515 are respectively provided with a first yoke limiting opening 15140 and a second yoke limiting opening 15150 which match the outer circumference of the two ends of the short-circuit protection bracket 152. An opening slightly smaller than the diameter of the short-circuit protection bracket 152 is respectively provided on one side of the first yoke limiting opening 15140 and the second yoke limiting opening 15150. The left end and the right end of the short-circuit protection bracket 152 can pass through the opening and be inserted into the first yoke limiting opening 15140 and the second yoke limiting opening 15150 respectively. 0, and a step groove 1516 is provided at the right end of the short-circuit protection bracket 152 to abut against the inner side of the second yoke plate 1515, and an abutting plate 1519 is provided at the left end of the short-circuit protection bracket 152 to abut against the inner side of the first yoke plate 1514, and a connecting foot 1517 is provided to match the side of the first yoke plate 1514. The connecting foot 1517 can limit the installation angle of the coil skeleton and the yoke 151, and play an insulating role between the welding point between the short-circuit protection coil 153 and the wire and the yoke 151.

[0057] A first baffle 2111 cooperating with the outer side of the second yoke plate 1515 is provided on the outer side of the left end of the leakage protection bracket 221, and a second baffle 2112 arranged opposite to the first baffle 2111 is provided on the outer side of the right end of the leakage protection bracket 221. The leakage protection coil 222 corresponds to between the first baffle 2111 and the second baffle 2112. A connecting claw 2114 in an L-shaped inverted buckle hung on the top side of the second yoke plate 1515 is provided on the top corner of the back side of the top side of the first baffle 2111. Preferably, a reinforcing plate 2115 connected to the middle part of the top side of the first baffle 2111 and forming a triangle is provided on the side of the connecting claw 2114. In this embodiment, the short-circuit protection bracket 152 and the leakage protection bracket 221 are assembled with the yoke 151 in a simple and convenient manner, and the leakage protection bracket 221 is arranged on the outside of the yoke 151 and above the static contact 170. In a circuit breaker that does not need to be provided with a leakage protection unit, not providing the leakage protection bracket 221 will not affect the assembly of the short-circuit protection unit 150 and the yoke 151. In addition, the release 220 can be pre-assembled with the short-circuit protection unit 150 outside the housing through the connecting claw 2114 and then assembled together into the housing, which has the characteristic of reducing the difficulty of assembly.

[0058] Furthermore, the push rod 155 includes an outer push portion 1552 that cooperates with the leakage protection core 224, and an inner push portion 1553 that cooperates with the intermediate core 223 and the short-circuit protection core 154. The outer push portion 1552 is T-shaped, and includes an outer push plate 1554 that is arranged on the outer side of the leakage protection core 224 and directly contacts and cooperates with the operating mechanism 120, and an outer push rod 1555 connected to the inner push portion 1553. The leakage protection core 224 is sleeved on the outer side of the outer push rod 1555. The middle part of the left end of the outer push rod 1555 is axially provided with a push plate that is connected to the inner push rod 1553. The outer push rod hole 1556 matched with the moving part 1553, the leakage protection spring 2242 is sleeved on the outer side of the outer push rod 1555, one end of the inner push part 1553 is matched with the short-circuit protection iron core 154, and the other end is provided with a push rod baffle 1551 matched with the intermediate iron core 223, and the push rod baffle 1551 is provided with an inner push rod shaft 1557 extending into the outer push rod hole 1556, and a locking ring 1158 is provided on the circumference of the inner push rod shaft 1557, and a locking groove 1159 matched with the locking ring 1158 is provided on the inner wall of the outer push rod hole 1556. By dividing the push rod 155 into the outer push part 1552 and the inner push part 1553, the leakage protection iron core 154 can be conveniently sleeved on the outer push part 1552, which not only has low assembly difficulty, but also has the characteristics of compact structure and reliable connection.

[0059] like Figure 3-4 An embodiment of the short-circuit protection bracket 152 is also shown, wherein the short-circuit protection baffle 1511 divides the cavity inside the short-circuit protection bracket 152 into a leakage protection cavity 151b connected to the cavity inside the leakage protection bracket 221, and a short-circuit protection cavity 151a away from the leakage protection bracket 221, that is, the cross-section of the short-circuit protection bracket 152 is H-shaped, the length and width of the leakage protection cavity 151b are both smaller than the short-circuit protection cavity 151a, and the length of the middle iron core 223 is greater than the length of the leakage protection cavity 151b, and the left end of the middle iron core 223 is arranged in the leakage protection cavity 151b, and the right end extends into the cavity of the leakage protection bracket 221;

[0060] The short-circuit protection core 154 is arranged in the short-circuit protection cavity 151a, and the right end of the short-circuit protection core 154 is provided with a short-circuit protection spring groove 1541 which cooperates with the push rod 155, and a short-circuit protection spring 1542 which is sleeved on the push rod 155 is provided in the short-circuit protection spring groove 1541, one end of the short-circuit protection spring 1542 is against the bottom of the short-circuit protection spring groove 1541, and the other end is against the short-circuit protection baffle 1511, and a limiting member 156 which cooperates with the left end of the short-circuit protection core 154 is provided at the left end of the short-circuit protection bracket 152, the limiting member 156 is fixedly connected to the short-circuit protection bracket 152 and limits the short-circuit protection core 154 in the short-circuit protection bracket 152, the short-circuit protection spring 1542 is not connected to the push rod 155, and the action of the short-circuit protection spring 1542 can be prevented when the leakage protection unit drives the push rod 155 to act.

[0061] Furthermore, the limiting member 156 includes a ring-shaped limiting plate 1561, and a limiting cylinder 1562 is provided on the circumference of the limiting plate 1561 and is sleeved on the outer side of the edge of the short-circuit protection bracket 152. At least one set of locking mechanisms is provided on the limiting cylinder 1562, and each set of locking mechanisms includes two limiting grooves 1563 relatively arranged on both sides of the limiting cylinder 1562, and locking claws 1564 respectively arranged on one side of the limiting groove 1563, one end of the locking claw 1564 is fixedly connected to one end of the limiting groove 1563, and the other end is spaced from the other end of the limiting groove 1563 to form a locking entrance 1565, and at least two corresponding limiting grooves 1563 are provided on the outer circumference of the edge of the short-circuit protection bracket 152. A locking block 1566 is provided, and a locking block introduction slope 1566a that cooperates with the locking claw 1564 is provided on the top corner side of the locking block 1566, and a locking claw introduction slope 1566b that cooperates with the locking block introduction slope 1566a is provided on the top corner side of the locking claw 1564. When the limiting member 156 is put on the short-circuit protection bracket 152, the locking blocks 1566 pass through the locking entrances 1565 and enter the limiting grooves 1563 respectively, and then the limiting member 156 is screwed to make the locking block 1566 stuck between the limiting groove 1563 and the locking claw 1564, so that a fixed connection is formed between the limiting member 156 and the short-circuit protection bracket 152, which has the characteristics of simple structure, convenient assembly and high reliability. Preferably, a core limiting boss 1568 cooperating with the shell is provided on the left end face of the short-circuit protection core 154, and a limiting plate through hole 1567 for avoiding the core limiting boss 1568 is provided in the middle of the limiting plate 1561. The core limiting boss 1568 can not only distribute the impact force to the shell by cooperating with the shell to prevent the limiting plate 1561 from falling off, but also increase the size of the short-circuit protection core 154, improve the speed during operation and increase the current limiting capacity.

[0062] like Figure 6As shown, the leakage protection circuit breaker created by the present invention also includes a testing mechanism, which includes a test button 310, a test spring 320 and a conductive plate 330. One end of the conductive plate 330 and the test spring 320 are respectively connected to the front end and the rear end of the wire passing through the transformer 210, and the other ends of the conductive plate 330 and the test spring 320 are arranged opposite to each other. One end of the test button 310 extends out of the shell, and the other end is arranged opposite to one end of the test spring 320. Pressing the test button 310 can make the conductive plate 330 contact with the test spring 320, so that the current of the wire in the transformer 210 is unbalanced. The test spring 320 can also drive the test button 310 to reset, which has the characteristics of simple structure and small space occupation.

[0063] like Figure 1 As shown, the test mechanism is arranged between the operating mechanisms 120 of two adjacent circuit breakers, the test button 310 is arranged between the operating mechanisms 120 of the two-pole circuit breakers, one end of the test spring 320 and the conductive plate 330 are respectively connected to the main circuits of two different circuit breakers, and the connection points of the test spring 320 and the conductive plate 330 with the main circuits of their respective circuit breakers are respectively located at the front end and the rear end of the mutual inductor 210, and the shell is provided with an avoidance hole at the root of the coil at the upper left corner for avoiding the test spring 320 and the conductive plate 330, so as to facilitate the connection of the test spring 320 and the conductive plate 330 with other circuit breakers. The test button 310 is generally arranged on the front of the switch, and is arranged on the side of the front of the switch close to the handle 110 and the operating mechanism 120. Therefore, a common solution is that when the handle 110 is in the middle position, the test button 310 is arranged on the opposite side of the operating mechanism 120; when the handle 110 is on the side, the test button 310 is arranged on one side of the operating mechanism 120 and on the opposite side of the handle 110. By avoiding arranging the test button 310, the operating mechanism 120 and the handle 110 in the same plane, and instead arranging the test button 310 between the operating mechanisms 120 of the two-pole circuit breakers, the layout space between the circuit breakers can be reasonably utilized.

[0064] like Figure 1-2An embodiment of the operating mechanism 120 is shown, the operating mechanism 120 includes a rocker arm 121 pivotally mounted in a housing, a lock catch 122 and a trip catch 123 pivotally mounted on the rocker arm 121, and a connecting rod 125 connected between the rocker arm 121 and the handle 110, the handle 110 is pivotally mounted in the housing, the moving contact 160 is arranged on the rocker arm 121, and the rocker arm 121 is connected to the housing through an energy storage spring (not shown in the figure), and a pull rod 124 is arranged on the trip catch 123 to cooperate with the bimetallic strip 141 of the overload protection unit 140. When the lock catch 122 and the trip catch 123 are snap-fitted, the handle 110 can drive the rocker arm 121 to overcome the force of the energy storage spring and drive the moving contact 160 to contact the static contact 170 to conduct the electrical circuit. When there is an abnormality in the electrical circuit, the bimetallic strip 141 can bend when overloaded and pull the trip buckle 123 and the lock buckle 122 through the pull rod 124 to release the buckle cooperation, so that the energy storage spring releases energy to drive the rocker arm 121 to drive the moving contact 160 to separate from the static contact 170 to trip the circuit breaker. The short-circuit protection unit 150 and the leakage protection unit can respectively push the rocker arm 121 through the push rod 155 to drive the moving contact 160 to separate from the static contact 170 to trip the circuit breaker in the event of short circuit and leakage.

[0065] The above content is a further detailed description of the invention in combination with specific preferred implementation methods, and it cannot be determined that the specific implementation of the invention is limited to these descriptions. For ordinary technicians in the technical field to which the invention belongs, several simple deductions or substitutions can be made without departing from the concept of the invention, which should be regarded as falling within the scope of protection of the invention.

Claims

1. A leakage protection circuit breaker, comprising a circuit breaker and a handle (110), an operating mechanism (120), an overload protection unit (140) and a short circuit protection unit (150) arranged in a housing of the circuit breaker, characterized in that: It also includes a leakage protection unit, wherein the leakage protection unit and the short-circuit protection unit (150) are arranged on one side of the operating mechanism (120) in correspondence with the operating mechanism (120), and the overload protection unit (140) is arranged on the other side of the operating mechanism (120), and the leakage protection unit includes a mutual inductor (210) and a tripper (220), and the mutual inductor (210) is arranged below the short-circuit protection unit (150); A cylindrical coil frame is provided in the shell, and the short-circuit protection unit (150) comprises a short-circuit protection coil (153) sleeved on the outside of the coil frame, a short-circuit protection iron core (154) arranged on the inside of the coil frame and cooperating with the short-circuit protection coil (153), and a push rod (155) cooperating with the short-circuit protection iron core (154). When a short circuit occurs, the short-circuit protection coil (153) drives the short-circuit protection iron core (154) to drive the push rod (155) to push the operating mechanism (120) to unlock; The release (220) comprises a leakage protection coil (222) which is sleeved outside the coil frame and located on one side of the short-circuit protection coil (153), and an intermediate iron core (223) which is arranged on the inner side of the coil frame. The intermediate iron core (223) cooperates with the leakage protection coil (222) and the push rod (155). The middle part of the push rod (155) is limitedly matched with the intermediate iron core (223) and one end of the push rod (155) passes through the intermediate iron core (223) and is connected to the short-circuit protection iron core (154). A leakage protection iron core (224) extending to the inner side of the leakage protection coil (222) is provided in the frame, a leakage protection spring (2242) is provided between the middle iron core (223) and the leakage protection iron core (224), and a leakage push rod hole (2243) for avoiding the push rod (155) is provided in the middle of the leakage protection iron core (224). When leakage occurs, the leakage protection coil (222) drives the middle iron core (223) to drive the push rod (155) to push the operating mechanism (120) to unlock; The coil frame is provided with a short-circuit protection baffle (1511) for limiting the intermediate iron core (223) between the intermediate iron core (223) and the short-circuit protection iron core (154); the short-circuit protection baffle (1511) is provided with a baffle push rod hole (1512) for allowing the push rod (155) to pass through; and a short-circuit protection spring (1542) is provided between one end of the short-circuit protection iron core (154) and the short-circuit protection baffle (1511); A magnetic yoke (151) for fixing a coil skeleton is provided in the shell, the magnetic yoke (151) is in a U shape, a short-circuit protection coil (153) is arranged on the inner side of the magnetic yoke (151), a leakage protection coil (222) is arranged on the outer side of the magnetic yoke (151), a static contact (170) fixedly connected to the magnetic yoke (151) is provided below the leakage protection coil (222), the static contact (170) is electrically connected to one end of the short-circuit protection coil (153), a moving contact (160) arranged opposite to the static contact (170) is provided at the bottom of the operating mechanism (120), a wiring terminal (130) electrically connected to the other end of the short-circuit protection coil (153) is provided on the left side of the shell, and a wiring terminal (130) electrically connected to the moving contact (160) is provided on the right side of the shell.

2. The leakage protection circuit breaker according to claim 1, characterized in that: It comprises a plurality of circuit breakers arranged in parallel, the plurality of circuit breakers are connected via a linkage mechanism, a leakage protection unit is arranged in the housing of one of the circuit breakers, and main circuit wires of all the circuit breakers pass through the mutual inductor (210) of the leakage protection unit.

3. The leakage protection circuit breaker according to claim 2, characterized in that: A testing mechanism is provided in the housing of one of the circuit breakers, the testing mechanism comprising a testing button (310), a testing spring (320) and a conducting plate (330); the testing button (310) is arranged between the operating mechanisms (120) of the two circuit breakers; the testing spring (320) and the conducting plate (330) are arranged at intervals; the testing button (310) and one end of the testing spring (320) are arranged opposite to each other and can drive one end of the testing spring (320) to contact one end of the conducting plate (330) to conduct a testing circuit; the testing circuit passes through a mutual inductor (210); the other ends of the testing spring (320) and the conducting plate (330) are respectively connected to the main circuits of two different circuit breakers; and the connection points of the testing spring (320) and the conducting plate (330) with the main circuits of the respective circuit breakers are respectively located at the front end and the rear end of the mutual inductor (210).

4. The leakage protection circuit breaker according to claim 1, characterized in that: A static contact (170) and a moving contact (160) are arranged opposite to each other in the housing, the moving contact (160) is connected to the operating mechanism (120), and an arc extinguishing mechanism (180) cooperating with the static contact (170) is provided on one side of the mutual inductor (210).

5. The leakage protection circuit breaker according to claim 4, characterized in that: The mutual inductor (210) is horizontally placed below the short-circuit protection unit (150), and the axis of the magnet of the mutual inductor (210) is arranged parallel to the thickness direction of the shell of the circuit breaker, and the yoke (151) divides the side of the shell away from the short-circuit protection unit (150) into a mutual inductor cavity for accommodating the mutual inductor (210); the arc extinguishing mechanism (180) is arranged on a side of the mutual inductor (210) close to the static contact (170) and correspondingly arranged below the static contact (170), and the arc extinguishing mechanism (180) is inclined and arranged opposite to the moving contact (160).

6. The leakage protection circuit breaker according to claim 1, characterized in that: The leakage protection coil (222) is arranged on the right side of the short-circuit protection coil (153); the intermediate iron core (223) is cylindrical and is sleeved on the push rod (155); a push rod baffle (1551) is provided on the circumference of the push rod (155) and is matched with the right end face of the intermediate iron core (223); the right end of the intermediate iron core (223) extends to the inner side of the leakage protection coil (222) and is matched with one end of the leakage protection coil (222); the left end of the intermediate iron core (223) extends to the inner side of the short-circuit protection coil (153) and is matched with one end of the short-circuit protection coil (153); and the left end of the intermediate iron core (223) is spaced apart from the short-circuit protection iron core (154).

7. The leakage protection circuit breaker according to claim 6, characterized in that: The cross section of the coil frame is H-shaped; the short-circuit protection baffle (1511) divides the cavity inside the coil frame into a leakage protection cavity (151b) and a short-circuit protection cavity (151a); the leakage protection iron core (224) is arranged in the leakage protection cavity (151b) and at an end away from the short-circuit protection baffle (1511); and the short-circuit protection iron core (154) is arranged in the short-circuit protection cavity (151a).

8. The leakage protection circuit breaker according to claim 1, characterized in that: The yoke (151) comprises a first yoke plate (1514) and a second yoke plate (1515) arranged opposite to each other, and a yoke connecting plate (1513) connected between the first yoke plate (1514) and the second yoke plate (1515); the coil frame comprises a short-circuit protection bracket (152) matched with the short-circuit protection coil (153) and a leakage protection bracket (221) matched with the leakage protection coil (222); the short-circuit protection bracket (152) is arranged on the first yoke plate (1514) ) and a second yoke plate (1515), a leakage protection bracket (221) is arranged on the outside of the yoke (151), a first baffle (2111) and a second baffle (2112) matched with the leakage protection coil (222) are respectively arranged at both ends of the leakage protection bracket (221), the first baffle (2111) is matched with the outside of the second yoke plate (1515), and a connecting claw (2114) which is inverted in an L shape and buckled on the top side of the second yoke plate (1515) is arranged on the top side of the first baffle (2111).

9. The leakage protection circuit breaker according to claim 8, characterized in that: The yoke (151) comprises a first yoke plate (1514) and a second yoke plate (1515) which are arranged opposite to each other, and a yoke connecting plate (1513) connected between the first yoke plate (1514) and the second yoke plate (1515); the short-circuit protection bracket (152) is arranged on the inner side of the first yoke plate (1514) and the second yoke plate (1515); a yoke extension plate (1518) extending toward the front is arranged on the side of the yoke connecting plate (1513); one end of the yoke extension plate (1518) close to the second yoke plate (1515) extends toward the bottom of the leakage protection bracket (221) and is fixedly connected to the static contact (170).

10. The leakage protection circuit breaker according to claim 8, characterized in that: The first yoke plate (1514) and the second yoke plate (1515) are respectively provided with a first yoke limiting opening (15140) and a second yoke limiting opening (15150) which are matched with the outer circumference of the two ends of the short-circuit protection bracket (152); an opening slightly smaller than the diameter of the short-circuit protection bracket (152) is respectively provided on one side of the first yoke limiting opening (15140) and the second yoke limiting opening (15150); the left end and the right end of the short-circuit protection bracket (152) can be respectively penetrated The opening is inserted into the first yoke limit opening (15140) and the second yoke limit opening (15150) for fixation, and a step groove (1516) that abuts against the inner side of the second yoke plate (1515) is provided at the right end of the short-circuit protection bracket (152), and an abutment plate (1519) that abuts against the inner side of the first yoke plate (1514) and a connecting foot (1517) that cooperates with the side of the first yoke plate (1514) are provided at the left end of the short-circuit protection bracket (152).

11. The leakage protection circuit breaker according to claim 1, characterized in that: The coil skeleton is provided with a limiting member (156) matched with the short-circuit protection core (154) at one end away from the leakage protection core (224), the limiting member (156) comprising a ring-shaped limiting plate (1561), a limiting cylinder (1562) sleeved on the outer side of the coil skeleton is provided on the circumference of the limiting plate (1561), and at least one group of locking mechanisms is provided on the limiting cylinder (1562), each group of locking mechanisms comprising two limiting grooves (1563) relatively arranged on two sides of the limiting cylinder (1562), and two limiting grooves (1563) respectively arranged on the limiting cylinder (1562). A locking claw (1564) is provided on one side of the groove (1563), one end of the locking claw (1564) is fixedly connected to one end of the limiting groove (1563), and the other end is spaced apart from the other end of the limiting groove (1563) to form a locking entrance (1565), and at least two locking blocks (1566) are provided on the outer circumference of the coil skeleton and are arranged corresponding to the limiting groove (1563), and the locking blocks (1566) can pass through the locking entrance (1565) and be stuck between the limiting groove (1563) and the locking claw (1564).

12. The leakage protection circuit breaker according to claim 1, characterized in that: The push rod (155) comprises an outer push portion (1552) cooperating with the leakage protection iron core (224), and an inner push portion (1553) cooperating with the intermediate iron core (223) and the short-circuit protection iron core (154); the outer push portion (1552) is T-shaped, and comprises an outer push plate (1554) arranged on the outer side of the leakage protection iron core (224) and directly contacting and cooperating with the operating mechanism (120), and an outer push rod (1555) connected to the inner push portion (1553); the leakage protection iron core (224) is sleeved on the outer side of the outer push rod (1555); the middle part of the left end of the outer push rod (1555) is axially provided with a contact plate (1554) cooperating with the inner push portion (120) The inner push portion (1553) is provided with an outer push rod hole (1556) which cooperates with the short-circuit protection iron core (154), and the leakage protection spring (2242) is sleeved on the outside of the outer push rod (1555). One end of the inner push portion (1553) cooperates with the short-circuit protection iron core (154), and the other end is provided with a push rod baffle (1551) which cooperates with the middle iron core (223). The push rod baffle (1551) is provided with an inner push rod shaft (1557) which extends into the outer push rod hole (1556) and cooperates with it. A locking ring (1158) is provided on the circumference of the inner push rod shaft (1557), and a locking groove (1559) which cooperates with the locking ring (1158) is provided on the inner wall of the outer push rod hole (1556).

13. The leakage protection circuit breaker according to claim 1, characterized in that: The operating mechanism (120) comprises a rocker arm (121) pivotally mounted in a housing, a lock catch (122) and a trip catch (123) pivotally mounted on the rocker arm (121), and a connecting rod (125) connected between the rocker arm (121) and a handle (110), wherein the handle (110) is pivotally mounted in the housing, a moving contact (160) is arranged on the rocker arm (121), and the rocker arm (121) is connected to the housing via an energy storage spring, and a pull rod (124) is arranged on the trip catch (123) to cooperate with a bimetallic strip (141) of an overload protection unit (140), and when the lock catch (122) is latched with the trip catch (123), When in cooperation, the handle (110) can drive the rocker arm (121) to overcome the action force of the energy storage spring and drive the moving contact (160) to contact the static contact (170); the bimetallic strip (141) can bend when overloaded and pull the trip buckle (123) and the lock buckle (122) through the pull rod (124) to release the buckle cooperation, so that the rocker arm (121) drives the moving contact (160) and the static contact (170) to separate; the short-circuit protection unit (150) and the leakage protection unit can respectively push the rocker arm (121) through the push rod (155) to drive the moving contact (160) and the static contact (170) to separate in the case of short circuit and leakage, so as to trip the circuit breaker.

14. The leakage protection circuit breaker according to claim 5, characterized in that: The static contact (170) is connected to the yoke (151) via a contact plate (171), the contact plate (171) is U-shaped, the static contact (170) is arranged in the middle of the contact plate (171), the side edge of one side of the contact plate (171) is fixedly connected to the yoke (151), and the side edge of the other side of the contact plate (171) is provided with a first arc-starting plate (181) that extends downwardly and obliquely to one side of the arc-extinguishing mechanism (180).

15. The leakage protection circuit breaker according to claim 14, characterized in that: A second arc-striking plate (182) is provided on one side of the arc-extinguishing mechanism (180), and the second arc-striking plate (182) is V-shaped and comprises arc-striking plates (183) arranged on both sides of the arc-extinguishing mechanism (180) opposite to the first arc-striking plate (181), a fixing plate (184) fixedly connected to the bimetallic plate (141) of the overload protection unit (140), and an isolating plate (185) connected to one end of the arc-striking plate (183) and the fixing plate (184), wherein the isolating plate (185) extends below the moving contact (160) to between the stationary contact (170) and the bimetallic plate (141).

16. The leakage protection circuit breaker according to claim 15, characterized in that: The isolation sheet (185) is U-shaped, the inner sides of the two side edges thereof are fitted together, and the ends are respectively fixedly connected to the arc-starting sheet (183) and the fixing sheet (184).

17. The leakage protection circuit breaker according to claim 15, characterized in that: The fixing plate (184) is S-shaped, one end of which is provided with a plug pin, and the housing is provided with a plug slot (1860) that plugs into and matches the plug pin. The other end of the fixing plate (184) is bent toward a side away from the isolation plate (185) and fixedly connected to the bimetallic strip (141).

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