Control and protection switching device

Abstract

The invention discloses a control and protection switching device, which comprises an upper shell and a lower shell which are detachably connected, and is characterized in that an electromagnetic mechanism and an operating mechanism are arranged in the upper shell, a contact mechanism linked with the electromagnetic mechanism and the operating mechanism is arranged in the lower shell, the operating mechanism comprises a first shell and a first cover plate which are detachably connected, and the first cover plate is arranged on the first shell. An on-off push rod, a short circuit push rod and a first rotating shaft penetrating out of the first shell are movably arranged in the first shell, an on-off microswitch and a short circuit alarm microswitch are arranged in the first shell, the lower end of the first rotating shaft can be in linkage with the on-off push rod and the short circuit push rod, and the on-off push rod can be in linkage with the on-off microswitch. The short circuit push rod can be in linkage with the short circuit alarm microswitch, and the lower end of the short circuit push rod is provided with a plurality of first protruding blocks in linkage with the contact mechanism. The control and protection switching device is simple and compact in structure and smaller in size.

Description

Technical Field

[0001] This invention relates to the field of electrical switch technology, and more specifically to a control and protection switch. Background Technology

[0002] With the continuous development of intelligent cloud power distribution technology, control and protection switches have been widely used. Control and protection switch products adopt a modular single product structure, integrating the main functions of traditional circuit breakers, contactors, overload protection relays, isolators, etc. They can connect, carry, and disconnect circuits under specified abnormal conditions. Control and protection switch electrical appliances have comprehensive functions, and their structure is relatively more complex than that of general switches. In order to facilitate production and maintenance, modularization is a major development direction for control and protection switch electrical appliances, and the assembly between modules must also be simple and reliable.

[0003] For example, Chinese invention patent application number 202210860299.2 discloses a switching mechanism for a dual-power transfer switch, including an input swing arm and switching linkages and a tripping assembly located on both sides. The tripping assembly includes a locking block and a contact frame. The input swing arm has a stop arm facing the locking block, and grooves are provided on both sides of the stop arm. The locking block is connected to an elastic element, giving it a tendency to move towards the input swing arm. When the stop arm contacts the locking block, the switch is in the open state. When the stop arm rotates to make the groove correspond to the locking block, the locking block moves into the groove and is limited to the closed state. The locking block moves along the X-axis, and the contact frame moves along the Y-axis. An inclined surface is provided on the contact frame, which engages with the locking block. When the contact frame moves along the Y-axis, the inclined surface pushes the locking block to move along the X-axis, causing the locking block to leave the groove. This operating mechanism has a relatively complex structure and a large volume, which passively increases the size of the electrical switch housing, thereby increasing production costs.

[0004] For example, Chinese invention patent application number 201621314174.6 discloses a base assembly for an electric switch, including a base and a cover plate. Multiple contact bridges are movably arranged within the base, with moving contacts on both sides of each contact bridge. The cover plate has stationary contacts aligned with the moving contacts. A spring is provided between the contact bridges and the base. The base is characterized by having opening slots and mounting plates at both ends of its bottom, and a detachable sealing plug aligned with the contact bridges at the bottom. The mounting plate is detachably disposed within the opening slots and can move left and right within the slots. This contact structure is cumbersome to install into the base, requiring the internal structures to be installed one by one. Furthermore, the base space is limited, making installation time-consuming and labor-intensive.

[0005] For example, Chinese utility model patent application number 202023034050.1 discloses an electromagnetic module for controlling and protecting switching electrical appliances, including a coil frame and a moving iron core and a stationary iron core disposed on the coil frame. Its features are: the coil frame is fitted with an outer shell; the stationary iron core is fixed between the coil frame and the outer shell; the moving iron core can move up and down on the coil frame; a first bracket that can be linked with the moving iron core is hinged to the lower part of the outer shell; a second bracket that can be linked with the first bracket is hinged to one side of the outer shell; a connecting rod passes through the moving iron core, with both ends of the connecting rod passing through the first bracket and exiting the outer shell; a first strip-shaped through hole for accommodating the movement of the connecting rod is provided on the first bracket; a second strip-shaped through hole for accommodating the movement of the connecting rod is provided on the outer shell; a tension spring is provided between one side of the second bracket and the first bracket, and the other side between the second bracket and the outer shell. This electromagnetic mechanism uses a tension spring for reset, but tension springs have low elasticity and are easily deformed in actual use, leading to inaccurate and unstable reset actions.

[0006] For example, Chinese utility model patent application number 202023039727.0 discloses an electromagnetic system for controlling and protecting switching electrical appliances. Its features include: a detachably connected housing and a bracket; a coil frame between the housing and the bracket; a stationary iron core between the housing and the coil frame; a movable iron core between the bracket and the coil frame; a pressure frame hinged to the lower part of the bracket; the upper end of the pressure frame can be linked with the movable iron core; lower pressure spring seats on both sides of the outer end of the pressure frame; an upper pressure spring seat aligned with the lower pressure spring seat on the bracket; a compression spring between the upper and lower pressure spring seats; and a positioning plate passing through the stationary iron core, with both ends of the positioning plate extending out of the housing. In this electromagnet, the stationary iron core (magnetic yoke) is fixed only by a positioning plate, resulting in poor structural stability. The impact of the movable iron core (armature) on the stationary iron core (magnetic yoke) easily causes the positioning plate to bend, leading to inaccurate electromagnet operation.

[0007] For example, Chinese utility model patent application number 201911211644.4 discloses a low-voltage protection switch device with switch contacts and a switch lock arranged in an insulating material housing. The switch lock is mechanically coupled to the switch contacts to cause the switch contacts to open and close. This low-voltage protection switch device can fix the insulating material housing to a load-bearing rail or support rail through a fixed side B arranged opposite to the front. When the operating mechanism of the low-voltage protection switch device is activated or subjected to external impact, vibration will occur. This installation structure has no vibration damping effect, causing the internal parts to vibrate as well, which can easily damage the internal parts and result in a short service life. Summary of the Invention

[0008] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a control and protection switch with a simple and compact structure and a smaller size.

[0009] Therefore, the present invention is implemented using the following technical solution:

[0010] A control and protection switch includes a detachably connected upper shell and a lower shell, characterized in that: the upper shell is provided with an electromagnetic mechanism and an operating mechanism, and the lower shell is provided with a contact mechanism that is linked to the electromagnetic mechanism and the operating mechanism; the operating mechanism includes a detachably connected first shell and a first cover plate; the first shell is movably provided with a closing / opening push rod, a short-circuit push rod, and a first rotating shaft extending out of the first shell; the first shell is also provided with a closing / opening micro switch and a short-circuit alarm micro switch; the lower end of the first rotating shaft can be linked with the closing / opening push rod and the short-circuit push rod; the closing / opening push rod can be linked with the closing / opening micro switch; the short-circuit push rod can be linked with the short-circuit alarm micro switch; and the lower end of the short-circuit push rod is provided with a plurality of first protrusions that are linked to the contact mechanism.

[0011] Furthermore, the short-circuit push rod has multiple limiting sliders at both its front and rear ends. The first cover plate has a first sliding groove for inserting and moving the limiting sliders. A first spring is provided between the short-circuit push rod and the first housing to move the short-circuit push rod to the right. The left end of the short-circuit push rod has an opening, and the connecting / disconnecting push rod is movably inserted into the opening. A second spring is provided between the connecting / disconnecting push rod and the first housing to move the connecting / disconnecting push rod to the right. The front and rear ends of the connecting / disconnecting push rod have sleeves extending towards the short-circuit push rod. The first housing, the short-circuit push rod, and the connecting / disconnecting push rod have a first column for accommodating the first spring and the second spring. The lower end of the first rotating shaft has a first protrusion that can push the connecting / disconnecting push rod and a second protrusion that can push the short-circuit push rod. The push rod has a first protrusion on the upper right side that accommodates the second protrusion. The first shaft inside the first housing has an upper cam on its upper part, and a latch that can hook one end of the upper cam is hinged inside the first housing. The latch is fitted with a first torsion spring that causes it to rotate counterclockwise. The first shaft is fitted with a second torsion spring that causes it to rotate counterclockwise. The torque of the second torsion spring is greater than the elastic force of the second spring. The first housing has a flat plate through which the first shaft passes. The first shaft above the flat plate has a first locking block. The left and right sides of the flat plate have locking plates that can block the first locking block. The upper part of the first housing and the first cover plate are detachably connected by multiple screws. The lower sides of the left and right ends of the first cover plate have first insert blocks. The first housing has a first insertion hole for inserting the first insert block.

[0012] Furthermore, a first indicator is rotatably connected to the upper part of the outer wall of the first housing. The upper end of the first indicator is provided with a mark that can be aligned with the indicator window of the upper housing, and the lower part is linked with the short-circuit push rod. The middle part of the first indicator is provided with a round hole, through which a first screw is screwed to the first housing. The first screw has a sleeve portion that allows the first indicator to rotate. The lower part of the first housing is provided with a first through hole that allows the first indicator to be inserted and moved. The lower part of the first indicator is provided with a first strip-shaped through hole. The short-circuit push rod is provided with a second column that can move within the first strip-shaped through hole. The upper end of the first rotating shaft is provided with a handle cam for installing a handle. The handle is provided with a first slot that allows the protrusion of the handle cam to be inserted, and the lower end of the handle is provided with multiple first buckles. The handle cam is provided with a first buckle hole that engages with the first buckle.

[0013] Furthermore, the electromagnetic mechanism includes a housing and a base detachably connected by multiple second snap-fits. A coil frame, a magnetic yoke, and an armature are provided between the housing and the base. A coil is wound around the coil frame. The magnetic yoke is fixed to the upper part of the housing. The armature can move up and down and is detachably connected to a fixing plate. Third springs are provided between the front and rear sides of the fixing plate and the housing. The inner wall of the housing has an upper positioning groove for inserting the upper part of the third spring. The fixing plate has a lower positioning groove for inserting the lower part of the third spring. The fixing plate has a groove for inserting the lower part of the armature, and the fixing plate has a through-hole. The armature has a third through-hole communicating with the second through-hole. An elastic plate is provided inside the second through-hole. The end rests in the third through hole, and the elastic plate has second strip-shaped through holes on both sides. The third through hole has a second protrusion that can be inserted into and move within the second strip-shaped through hole. The base has guide holes on both sides. The fixing plate has guide blocks that can be inserted into and move within the guide holes. The outer side of the outer shell has multiple third pillars with internal threaded holes. The front and rear sides of the magnetic yoke are detachably equipped with fixing members. The left and right sides of the fixing members have second slots, and the fixing members and the outer shell are detachably connected. The magnetic yoke has a convex shaft that can be inserted into the second slot. The front and rear sides of the outer shell have fourth through holes for the fixing members to enter and exit. The upper end of the coil frame has a wall plate that can block the fourth through hole and can rest against the fixing member.

[0014] Furthermore, the outer casing is provided with a circular boss and a third insertion hole. A second indicator is fitted on the circular boss. The inner wall of the second indicator is provided with a circular groove. A torsion spring that causes the indicator to rotate clockwise is placed in the circular groove. One end of the torsion spring abuts against the inner wall of the indicator, and the other end is inserted into the third insertion hole. The outer casing is provided with a shaft vertically. The upper end of the second indicator has a top cover. The upper end of the top cover has an indicator mark. The shaft is provided vertically through the outer casing. The upper end of the shaft abuts against the outer side of the lower end of the top cover, and the lower end abuts against the fixing plate. The outer casing is provided with a limiting boss located below the circular boss. The lower end of the indicator has a stop arm that abuts against the right end of the limiting boss.

[0015] Furthermore, the contact mechanism includes multiple third housings and an electromagnet, a contact support, and mutually aligned stationary and moving contacts disposed within the third housings. The stationary contact is disposed on a stationary contact plate, which passes through the left side of the third housing. The moving contact is disposed at the lower left end of the moving contact bridge, the middle of which is hinged within the third housing. The moving contact bridge is equipped with an elastic element that causes it to rotate counterclockwise. The moving iron core of the electromagnet can abut against the right end of the moving contact bridge. The contact support passes through the upper side of the third housing, with its upper end abutting against a fixed plate and its lower end abutting against the upper right side of the moving contact bridge. The electromagnet includes a fourth housing and a coil frame, a coil, and the fourth housing disposed within the fourth housing. A return spring is provided between the stationary and moving iron cores. The moving iron core is provided with a push rod that can abut against the right end of the moving contact bridge. The moving iron core can extend through one side of the fourth housing. The fourth housing is movably provided with a limiting member that can block the moving iron core. A second screw is screwed onto the fourth housing. The front end of the limiting member is provided with a circular hole that allows the second screw to pass through. The diameter of the circular hole is larger than the diameter of the second screw shank and smaller than the diameter of the second screw head. The rear end of the limiting member is provided with a downwardly bent limiting rod. The middle part of the limiting member is provided with a second boss. A fourth spring that abuts against the inner wall of the housing is sleeved on the second boss. The limiting rod can abut against the side wall of the moving iron core or block the rear end of the moving iron core. The rear section of the limiting member is provided with a reset rod that bends upward and abuts against the first protrusion. The fourth housing is provided with a through hole that allows the reset rod to pass through and move.

[0016] Furthermore, the third housing contains a first shaft and a second shaft. The middle part of the movable contact bridge is sleeved on the first shaft. The elastic element is a tension spring, with its upper end hooked onto the left side of the movable contact bridge and its lower end hooked onto the second shaft. A support member is provided on the right side of the movable contact bridge, with its upper surface higher than the plane of the movable contact bridge. The lower end of the contact support abuts against the upper surface of the support member. The movable contact bridge and the support member are fixed by multiple rivets. The push rod can abut against the right end face of the support member. A number of arc-extinguishing grid plates are arranged sequentially from top to bottom inside the third housing. The arc-extinguishing grid plates are inclined downwards from left to right, are parallel to each other, and there are nine arc-extinguishing grid plates in total. The right end of the arc-extinguishing grid plate is provided with an arc-inducing opening that allows the movable contact bridge to move. The length of the lowest arc-extinguishing grid plate is shorter than the length of the other arc-extinguishing grid plates. The third housing is provided with a cover that covers the arc-extinguishing grid plates. Multiple second inserts are provided on the front and rear sides of the arc-extinguishing grid plates. The cover is provided with a second insertion hole for inserting the second inserts. The third housing is provided with a groove for placing the cover. The third housing is also provided with a curtain that blocks the exhaust port. The curtain is made of flexible material. The third housing includes a front shell and a rear shell that are arranged opposite each other. The front shell and the rear shell are provided with multiple first mounting holes that are aligned with each other. Bolts are passed through the first mounting holes, and nuts are screwed to the other end of the bolts.

[0017] Furthermore, the upper shell and the lower shell are detachably connected by multiple third snap-fits. The bottom surface of the lower shell is provided with mounting plates on both sides, and the mounting plates are provided with multiple second mounting holes. The bottom surface of the lower shell is provided with third slots on both sides. The mounting plates are provided with inserts that can be inserted into the third slots. The inserts have limiting portions. The bottom surface of the lower shell is provided with a horizontal strip-shaped through hole that communicates with the third slot at a position aligned with the inside of the third slot. The front end or rear end of the inner side of the insert is provided with an L-shaped opening. The limiting portion is the insert portion at the L-shaped opening. The insert is provided with a protrusion that can extend into the horizontal strip-shaped through hole. The number of inserts is set to at least one.

[0018] Furthermore, the inner bottom of the lower shell is provided with a transverse long groove on the front and rear sides, and a fifth spring is transversely arranged in the transverse long groove. A second cover plate is detachably provided inside the lower shell to cover the transverse long groove and the fifth spring. The bottom surface of the lower shell is provided with a left opening groove and a right opening groove for accommodating the insertion of a locking rail. Multiple second locking blocks are provided on the outer side of the left opening groove and the right opening groove to lock the locking rail. The left part of the transverse long groove is connected to the right opening groove. The lower left part of the fifth spring extends into the right opening groove. The front and rear ends of the cover plate are respectively fixed to the lower shell by a third screw. A cylindrical boss is provided on the inner wall of the transverse long groove, and the fifth spring is sleeved on the cylindrical boss.

[0019] By adopting the above technical solution, the opening / closing push rod, the short-circuit push rod, the first rotating shaft, the opening / closing micro switch, and the short-circuit alarm micro switch are integrated between the first housing and the first cover plate. The first rotating shaft can be linked with the opening / closing push rod and the short-circuit push rod. The opening / closing push rod can be linked with the opening / closing micro switch, and the short-circuit push rod can be linked with the short-circuit alarm micro switch. In addition, the lower end of the short-circuit push rod is provided with multiple first protrusions that are linked with the contact mechanism, which makes the operating mechanism simple, compact, and smaller in size. At the same time, it makes the outer shell of the electrical switch smaller and the production cost lower. Attached Figure Description

[0020] The present invention includes the following figures:

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the operating mechanism in this invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the operating mechanism in this invention with the first cover plate removed;

[0024] Figure 4 This is a three-dimensional structural diagram of the operating mechanism of the present invention without the first housing and the first cover plate;

[0025] Figure 5 This is a three-dimensional structural diagram of the electromagnetic mechanism in this invention;

[0026] Figure 6 This is a top view of the electromagnetic mechanism in this invention;

[0027] Figure 7 for Figure 6 Sectional view along line AA;

[0028] Figure 8 for Figure 6 Sectional view along the BB direction;

[0029] Figure 9 This is an exploded view of the magnetic yoke and fixing components in this invention;

[0030] Figure 10 This is a three-dimensional structural diagram of the electromagnetic mechanism and the second indicator in this invention;

[0031] Figure 11 This is a three-dimensional structural diagram of a single third housing of the contact mechanism in this invention;

[0032] Figure 12 This is a schematic diagram of the third shell in this invention with the front shell removed;

[0033] Figure 13 This is a cross-sectional view of the third housing in this invention;

[0034] Figure 14 This is a three-dimensional structural diagram of the arc-extinguishing grid in this invention;

[0035] Figure 15 This is a three-dimensional structural diagram of the electromagnet in its normal state according to the present invention;

[0036] Figure 16 This is a three-dimensional structural diagram of the electromagnet under short-circuit conditions in this invention;

[0037] Figure 17 This is a three-dimensional structural diagram of the lower shell in this invention;

[0038] Figure 18 This is a schematic diagram of the mounting plate in this invention;

[0039] Figure 19 This is a top view of the lower shell in this invention;

[0040] Figure 20 for Figure 19 A schematic diagram of the structure without the second cover plate;

[0041] Figure 21 This is a front view schematic diagram of the lower shell structure in this invention.

[0042] Reference numerals: 1. First housing; 2. First cover plate; 3. Opening / closing push rod; 4. Short-circuit push rod; 5. First rotating shaft; 6. Opening / closing micro switch; 7. Short-circuit alarm micro switch; 8. First protrusion; 9. Limiting slider; 10. First slide groove; 11. First spring; 12. Opening; 13. Second spring; 14. Sleeve part; 15. First column; 16. First protrusion; 17. Second protrusion; 18. First boss; 19. Upper cam; 20. Lock; 21. First torsion spring; 22. Second torsion spring; 23. Flat plate; 24. First locking block; 25. Locking plate; 26. First insert block; 27. First insertion hole; 28. Upper housing; 29. ​​Lower housing; 30. First indicator; 31. Finger 32. Display window; 33. Marker; 34. Exhaust port; 35. First screw; 36. First through hole; 37. Handle cam; 48. Round boss; 49. First buckle; 40. First buckle hole; 41. First buckle hole; 42. Second buckle; 43. Outer shell; 44. Base; 45. Coil frame; 46. Magnetic yoke; 47. Armature; 48. Fixing plate; 49. Third spring; 50. Upper positioning groove; 51. Lower positioning groove; 52. Groove; 53. Second through hole; 54. Third through hole; 55. Elastic plate; 56. Second strip through hole; 57. Second protrusion; 58. Guide hole; 59. Guide block; 60. Third column; 61. Fixing component; 62. Second slot; 63. Protruding shaft; 64. Fourth through hole; 65. 66. Wall panel; 67. Third socket; 68. Second indicator; 69. Torsion spring; 70. Top cover; 71. Indicator; 72. Shaft; 73. Limiting boss; 74. Stop arm; 75. Third housing; 76. Contact support; 77. Stationary contact; 78. Moving contact; 79. Stationary contact piece; 80. Moving contact bridge; 81. Moving iron core; 82. Fourth housing; 83. Coil frame; 85. Return spring; 86. Top rod; 87. Limiting component; 88. Second screw; 89. Limiting rod; 90. Second boss; 91. Fourth spring; 92. Return rod; 93. Through hole; 94. First shaft; 95. Second shaft; 96. Tension spring; 97. Support component; 98. Rivet; 99. Arc extinguishing grid; 1 00. Arc-inducing opening; 101. Cover; 102. Second insert block; 103. Second insertion hole; 104. Slot; 105. Curtain; 106. Front shell; 107. Rear shell; 108. First mounting hole; 109. Third buckle; 110. Mounting plate; 111. Second mounting hole; 112. Third slot; 113. Insert piece; 114. Limiting part; 115. Horizontal through hole; 116. L-shaped opening; 117. Protrusion; 118. Horizontal long slot; 119. Fifth spring; 120. Second cover plate; 121. Left opening slot; 122. Right opening slot; 123. Second locking block; 124. Third screw; 125. Cylindrical boss; 126. Rail; 127. Handle. Detailed Implementation

[0043] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0044] Referring to the above figures, the present invention provides a control and protection switchgear comprising a detachably connected upper shell 28 and a lower shell 29, characterized in that: the upper shell 28 is provided with an electromagnetic mechanism and an operating mechanism, the lower shell 29 is provided with a contact mechanism that is linked with the electromagnetic mechanism and the operating mechanism, and the upper shell 28 and the lower shell 29 are detachably connected by a third latch 109.

[0045] Reference Figure 2-4As shown, the operating mechanism includes a detachably connected first housing 1 and a first cover plate 2. The first housing 1 contains a movably mounted opening / closing push rod 3, a short-circuit push rod 4, and a first rotating shaft 5 extending out of the first housing 1. The first housing 1 also contains an opening / closing micro switch 6 and a short-circuit alarm micro switch 7. The lower end of the first rotating shaft 5 can be linked with the opening / closing push rod 3 and the short-circuit push rod 4. The opening / closing push rod 3 can be linked with the opening / closing micro switch 6, and the short-circuit push rod 4 can be linked with the short-circuit alarm micro switch 7. The lower end of the short-circuit push rod 4 has multiple first protrusions 8 that are linked with the contact mechanism. The front and rear ends of the short-circuit push rod 4 each have multiple limiting sliders 9. The first cover plate 2 has a first sliding groove 10 that allows the limiting sliders 9 to be inserted and moved. A mechanism is provided between the short-circuit push rod 4 and the first housing 1 to facilitate short-circuit... A first spring 11 moves the short-circuit push rod 4 to the right, and an opening 12 is provided at the left end of the short-circuit push rod 4. The connecting and separating push rod 3 is movably inserted into the opening 12, and a second spring 13 is provided between the connecting and separating push rod 3 and the first housing 1 to cause the connecting and separating push rod 3 to move to the right. The front and rear ends of the connecting and separating push rod 3 are provided with sleeve portions 14 extending towards the short-circuit push rod 4. The first housing 1, the short-circuit push rod 4, and the connecting and separating push rod 3 are provided with a first column 15 for accommodating the first spring 11 and the second spring 13. The lower end of the first rotating shaft 5 is provided with a first protrusion 16 that can push the connecting and separating push rod 3 and a second protrusion 17 that can push the short-circuit push rod 4. The upper right side of the short-circuit push rod 4 is provided with a first boss 18 that accommodates the second protrusion 17. The upper part of the first rotating shaft 5 inside the first housing 1 is provided with an upper protrusion. The first housing 1 has a wheel 19, and a latch 20 that can hook one end of the upper cam 19 is hinged inside the first housing 1. The latch 20 is fitted with a first torsion spring 21 that causes it to rotate counterclockwise. The first rotating shaft 5 is fitted with a second torsion spring 22 that causes it to rotate counterclockwise. The torque of the second torsion spring 22 is greater than the elastic force of the second spring 13. The first housing 1 has a flat plate 23 through which the first rotating shaft 5 passes. The first rotating shaft 5 above the flat plate 23 has a first locking block 24. The left and right sides of the flat plate 23 have locking plates 25 that can block the first locking block 24. The upper parts of the first housing 1 and the first cover plate 2 are detachably connected by multiple screws. The lower sides of the left and right ends of the first cover plate 2 have first insert blocks 26. The first housing 1 has first insertion holes 27 for inserting the first insert blocks 26. The outer surface of the first housing 1... A first indicator 30 is rotatably connected to the upper part of the wall. The upper end of the first indicator 30 has a mark 32 that can be aligned with the indicator window 31 of the upper shell 28, and the lower part is linked with the short-circuit push rod 4. The middle part of the first indicator 30 has a round hole through which a first screw 34 is screwed to the first shell 1. The first screw 34 has a sleeve part 14 that allows the first indicator 30 to rotate. The lower part of the first shell 1 has a first through hole 35 that allows the first indicator 30 to be inserted and moved. The lower part of the first indicator 30 has a first strip-shaped through hole. The short-circuit push rod 4 has a second column that can move within the first strip-shaped through hole. The upper end of the first rotating shaft 5 has a handle cam 38 for mounting the handle 127. The handle 127 has a first slot into which the protrusion of the handle cam 38 is inserted.Furthermore, the lower end of the handle 127 is provided with multiple first buckles 40, and the handle cam 38 is provided with first buckle holes 41 that engage with the first buckles 40.

[0046] In this embodiment, the operating mechanism has three positions: closed, open, and re-engaged. In the closed position, one end of the upper cam 19 engages with the latch 20, holding the rotating shaft 72 in the closed position. The first protrusion 16 and the opening / closing push rod 3, and the second protrusion 17 and the short-circuit push rod 4 are not engaged. In the open position, the upper cam 19 and the latch 20 disengage, and the rotating shaft 72 rotates counterclockwise under the action of the second torsion spring 22, causing the first protrusion 16 to push the opening / closing push rod 3 to the left. The opening / closing push rod 3 actuates the opening / closing micro switch 6, causing it to open and disconnecting the power supply. When a short circuit occurs, the upper limiting member 87 of the electromagnet actuates, pushing the first protrusion 8 to drive the short-circuit push rod 4, and the first protrusion 18 pushes... The short-circuit alarm microswitch 7 is closed, at which point the operating mechanism resets. Rotating the shaft 72 to the reset position causes the second protrusion 17 to push the short-circuit push rod 4, resetting the upper limiting member 87 of the electromagnetic mechanism. The short-circuit push rod 4 resets under the force of the first spring 11, disconnecting the microswitch 7. The front and rear ends of the opening / closing push rod 3 are equipped with sleeves 14 extending towards the short-circuit push rod 4, making the operation of the opening / closing push rod 3 more stable and preventing deviation during movement. The first column 15 is used for positioning and installing the first spring 11 and the second spring 13, resulting in a more stable structure. The first locking block 24 and the locking plate 25 limit the rotation angle of the shaft 72, preventing... To prevent excessive rotation, the first insert 26, the first insert hole 27, and the screws facilitate the assembly of the first housing 1 and the first cover plate 2. Align the first slot of the handle 127 with the protrusion of the handle cam 38, then press the handle 127 down to engage the first latch 40 with the first latch hole 41. This facilitates assembly. Furthermore, the rotating shaft 72 has an upper cam 19, and the first housing 1 contains a latch 20 that can hook one end of the upper cam 19. When the handle 127 is closed, the upper cam 19 engages with the latch 20, keeping the handle 127 in the closed position and preventing accidental rotation of the handle 127 and the rotating shaft 72. The first torsion spring 21 is used for the reset of the latch 20, and the second torsion spring 22 is used for the rotation shaft 72. The reset of component 2 is achieved by rotating the shaft 72 via the handle 127, which drives the opening and closing cam to rotate. The first protrusion 16 actuates the opening and closing push rod 3, which in turn actuates the opening and closing micro switch 6, thereby realizing the switching of power. Rotating the handle 127 can also drive the second protrusion 17 to actuate the short-circuit push rod 4, realizing the reset after the short-circuit action. The first screw 34 has a sleeve part 14 that allows the first indicator 30 to rotate, which facilitates the smooth movement of the first indicator 30. When assembling the first indicator 30, first insert the lower end of the first indicator 30 into the first through hole 35, then put the first strip through hole on the second column, and finally tighten the first screw 34. The assembly is convenient and quick.

[0047] Reference Figure 5-10As shown, the electromagnetic mechanism includes a housing 43 and a base 44 detachably connected by multiple second latches 42. A coil frame 45, a magnetic yoke 46, and an armature 47 are provided between the housing 43 and the base 44. A coil is wound around the coil frame 45. The magnetic yoke 46 is fixed to the upper part of the housing 43. The armature 47 can move up and down and is detachably connected to a fixing plate 48. Third springs 49 are provided between the front and rear sides of the fixing plate 48 and the housing 43. The inner wall of the housing 43 has an upper positioning groove 50 for inserting the upper part of the third spring 49, and the fixing plate 48 has a lower positioning groove 51 for inserting the lower part of the third spring 49. The fixing plate 48 is provided with a groove 52 for inserting the lower part of the armature 47, and the fixing plate 48 is provided with a second through hole 53. The armature 47 is provided with a third through hole 54 communicating with the second through hole 53. An elastic plate 55 is provided in the second through hole 53, with both ends of the elastic plate 55 abutting against the third through hole 54. A second strip-shaped through hole 56 is provided on both sides of the elastic plate 55. A second protrusion 57 is provided in the third through hole 54 and can be inserted into and move within the second strip-shaped through hole 56. Guide holes 58 are provided on both sides of the base 44. The fixing plate 48 is provided with a guide block 59 that can be inserted into and move within the guide hole 58. The outer side of the outer shell 43 is provided with The device has multiple uprights with internally threaded holes. The magnetic yoke 46 has detachable fasteners 61 on its front and rear sides. Each fastener 61 has a second slot 62 on its left and right sides, and the fasteners 61 and the outer casing 43 are detachably connected. The magnetic yoke 46 has a protruding shaft 63 that inserts into the second slot 62. The outer casing 43 has fourth through holes 64 on its front and rear sides to accommodate the fasteners 61. The upper end of the coil frame 45 has a wall plate 65 that can block the fourth through holes 64. The wall plate 65 can abut against the fasteners 61. The outer casing 43 has a circular boss 39 and a third insertion hole 66. A second indicator 67 is fitted onto the circular boss 39. The inner wall of the second indicator 67 is provided with a circular groove 104, and a torsion spring 68 is placed in the circular groove 104 to cause the indicator to rotate clockwise. One end of the torsion spring 68 abuts against the inner wall of the indicator and the other end is inserted into the third insertion hole 66. The outer shell 43 is provided with a shaft 72 vertically. The upper end of the second indicator 67 has an upper cover 69, and the upper end of the upper cover 69 has an indicator mark 70. The shaft 72 is vertically inserted through the outer shell 43. The upper end of the shaft 72 abuts against the outer side of the lower end of the upper cover 69 and the lower end abuts against the fixing plate. The outer shell 43 is provided with a limiting boss 73, which is located below the circular boss 39. The lower end of the indicator has a stop arm 74 that abuts against the right end of the limiting boss 73.

[0048] In this embodiment, the armature 47 is reset by the third spring 49 provided on both sides of the fixing plate 48, which makes the structure more stable. Moreover, the third spring 49 has a high degree of elasticity and is not easily deformed, making the reset action of the armature 47 more stable and accurate. The upper positioning groove 50 and the lower positioning groove 51 can position the third spring 49 to prevent the third spring 49 from being displaced when the armature 47 moves, making the structure more stable. The armature 47 and the fixing plate 48 are detachably connected by an elastic sheet, making assembly simple and convenient. The guide block 59 and the guide hole 58 are set together to limit the movement of the fixing plate 48 and the armature 47. The base 44 and the outer shell 43 are detachably connected by the second buckle 42, making assembly simple and convenient. The third column 60 and the internal thread hole are provided to facilitate the installation of auxiliary mechanisms, operating mechanisms and other mechanisms, making them highly applicable. During installation, the internal thread hole is first placed into the outer shell 43, then the fixing member 61 is inserted into the fourth through hole 64, and the convex shaft 63 of the internal thread hole is inserted into the second slot 62 of the fixing member 61 to restrict the internal thread hole. The coil frame 45 is then inserted into the outer shell 43, and the wall plate 65 blocks the fourth through hole 64 to limit the fixing part 61, preventing it from falling out and restricting the left and right position of the internal thread hole. Finally, the base 44 and the outer shell 43 are fastened together to complete the connection and fixation of the coil frame 45, the fourth shell 82, and the magnetic yoke 46. When the electromagnetic mechanism is energized, it drives the armature 47 and the outer shell 43 to move upward. The outer shell 43 drives the shaft 72 to move upward, causing the second indicator 67 to rotate counterclockwise, thereby causing the index to move upward. The indicator is aligned with the viewing window of the electrical switch, allowing the user to easily see the state of the electromagnet. After the electromagnet is de-energized, the armature 47 and the housing 43 move downwards to reset under the action of the reset spring 85. At this time, the second indicator 67 rotates clockwise to reset under the force of the torsion spring 68. The stop arm 74 abuts against the limiting boss 73 to limit the second indicator 67. Simultaneously, the housing 43 presses the shaft 72 downwards to reset the shaft 72. The upper end of the shaft 72 abuts against the outer side of the lower end of the housing 43, preventing the second indicator 67 from falling outwards.

[0049] Reference Figure 11-16As shown, the contact mechanism includes multiple third housings 75 and an electromagnet, a contact support 76, and mutually aligned stationary contacts 77 and moving contacts 78 disposed within the third housings 75. The stationary contacts 77 are disposed on stationary contact plates 79, which pass through the left side of the third housings 75. The moving contacts 78 are disposed at the lower left end of the moving contact bridge 80, with the middle of the moving contact bridge 80 hinged within the third housings 75. The moving contact bridge 80 is equipped with an elastic element that causes it to rotate counterclockwise. The moving iron core 81 of the electromagnet can abut against the right end of the moving contact bridge 80. The contact support 76 passes through the upper side of the third housings 75, with its upper end abutting against a fixed plate and its lower end abutting against the upper right side of the moving contact bridge 80. The electromagnet includes a fourth housing 82 and a coil frame 83 disposed within the fourth housing 82. A return spring 85 is provided between the coil, the fourth housing 82, the stationary iron core, and the moving iron core 81. The moving iron core 81 is provided with a push rod 86 that can abut against the right end of the moving contact bridge 80. The moving iron core 81 can extend out of one side of the fourth housing 82. A limiting member 87 that can block the moving iron core 81 is movably provided on the fourth housing 82, and a second screw 88 is screwed onto the fourth housing 82. The front end of the limiting member 87 is provided with a circular hole for the second screw 88 to pass through. The diameter of the circular hole is larger than the diameter of the shank of the second screw 88 but smaller than the diameter of the head of the second screw 88. The rear end of the limiting member 87 is provided with a downwardly bent limiting rod 89, and a second boss 90 is provided in the middle of the limiting member 87. A fourth spring 91 that abuts against the inner wall of the housing is sleeved on the second boss 90. The limiting rod 89 can abut against the side wall of the moving iron core 81 or The rear end of the moving iron core 81 is blocked. The rear section of the limiting member 87 is provided with a reset rod 92 that bends upward and abuts against the first protrusion 8. The fourth housing 82 is provided with a through hole 93 through which the reset rod 92 can pass. The third housing 75 is provided with a first shaft 94 and a second shaft 95. The middle part of the moving contact bridge 80 is sleeved on the first shaft 94. The elastic element is a tension spring 96. The upper end of the tension spring 96 is hooked on the left side of the moving contact bridge 80, and the lower end is hooked on the second shaft 95. The right side of the moving contact bridge 80 is provided with a support member 97. The upper end plane of the support member 97 is higher than the plane of the moving contact bridge 80. The lower end of the contact support 76 abuts against the upper end surface of the support member 97. The moving contact bridge 80 and the support member 97 are fixed by multiple rivets 98. The push rod 86 can abut against the right end face of the support member 97. The third housing 75 contains a plurality of arc-extinguishing grid plates 99 arranged sequentially from top to bottom. The arc-extinguishing grid plates 99 are inclined downwards from left to right, are parallel to each other, and number nine. Each arc-extinguishing grid plate 99 has an arc-initiating opening 100 at its right end that accommodates the movable contact bridge 80. The length of the lowest arc-extinguishing grid plate 99 is shorter than the lengths of the other arc-extinguishing grid plates 99. The third housing 75 contains a cover 101 that covers the arc-extinguishing grid plates 99. Multiple second insertion blocks 102 are provided on the front and rear sides of each arc-extinguishing grid plate 99. The cover 101 has second insertion holes 103 for inserting the second insertion blocks 102. The third housing 75 contains a groove 104 for placing the cover 101, and the third housing 75 also has a curtain 105 that blocks the exhaust port 33.The curtain 105 is made of flexible material. The third housing 75 includes a front housing 106 and a rear housing 107 disposed opposite to each other. The front housing 106 and the rear housing 107 are provided with a plurality of mutually aligned first mounting holes 108. Bolts are inserted through the first mounting holes 108, and nuts are screwed to the other end of the bolts.

[0050] In this embodiment, a support member 97 is provided on the right side of the moving contact bridge 80. The upper surface of the support member 97 is higher than the plane of the moving contact bridge 80, so that the contact support 76 and the moving contact bridge 80 are not in direct contact. Through the conduction and heat dissipation of the support member 97, the high temperature of the moving contact 78 is prevented from being directly conducted to the contact support 76, thereby preventing the contact support 76 from deforming due to heat, ensuring the accuracy of the operation of the contact support 76, and extending its service life. In addition, the lower end of the support member 97 can be linked with other components (in case of short circuit, it is linked with the electromagnet to push the moving contact bridge 80 open, causing the moving and stationary contacts 77 to disconnect). The moving contact bridge 80 and the support member 97 are fixed by multiple rivets 98, making the structure stable and firm; the moving contact bridge 80 and The reset of the moving contact 78 is achieved using a tension spring 96. The tension spring 96 provides a more stable force, making the movement of the moving contact bridge 80 and the moving contact 78 more stable and less prone to burning, thus increasing its service life. Moreover, the tension spring 96 is less expensive. The arc-extinguishing grid plates 99 arranged sequentially from top to bottom improve the arc-extinguishing effect. The arc-initiating opening 100 not only initiates the arc but also allows the moving contact bridge 80 to move. The structure is compact and reasonable, making the overall size of the electrical switch smaller. The length of the bottommost arc-extinguishing grid plate 99 is shorter than that of the other arc-extinguishing grid plates 99 to increase the distance between the initial position arc-extinguishing grid plate 99 and the moving contact bridge 80, preventing the arc-extinguishing grid plate 99 from directly conducting electricity and losing its arc-extinguishing function if they are too close. The second insertion block 102 and the second insertion hole 103 make the overall structure of the arc-extinguishing cover more stable. Several arc-extinguishing grid plates 99 are arranged in a stepped manner at a uniform angle, which conforms to the arc trajectory of the electric arc when the moving contact 78 rotates, making it more conducive to arc initiation and arc extinguishing. When the electrical switch is short-circuited, the fixed plate of the electromagnetic mechanism is linked to the contact 78 support 76 being pressed down. At the same time, the electromagnet is energized, and the moving iron core 81 drives the push rod 86 to move outward, pushing the moving contact bridge 80 to disconnect the moving contact 78 and the stationary contact 77, so that the moving contact 78 and the stationary contact 77 are stably kept in the disconnected state, which is safer. Under normal conditions, the moving iron core 81 passes through the fourth housing 82 under the action of the return spring 85, limiting The position lever 89 abuts against the side wall of the moving iron core 81 under the action of the fourth spring 91. When the electromagnet is energized when the electrical switch is short-circuited, the moving iron core 81 moves forward and attracts the stationary iron core. At this time, the moving iron core 81 extends into the fourth housing 82. At the same time, the limiting member 87 swings under the action of the fourth spring 91, causing the limiting lever 89 to block the rear end of the moving iron core 81, limiting the moving iron core 81 to return to the initial position, so that the moving contact bridge 80 always remains in the open position, which is safer. After the short-circuit fault is contacted, the short-circuit push rod 4 of the operating mechanism moves and is linked with the reset lever 92 through the first protrusion 8, so that the limiting member 87 is reset. At this time, the limiting lever 89 disengages from the moving iron core 81, and the moving iron core 81 moves backward and resets under the action of the reset spring 85.

[0051] Reference Figure 17-21As shown, mounting plates 110 are provided on both sides of the bottom surface of the lower shell 29. Multiple second mounting holes 111 are provided on the mounting plates 110. Third slots 112 are provided on both sides of the bottom surface of the lower shell 29. The mounting plates 110 are provided with inserts 113 that can be inserted into the third slots 112. Each insert 113 has a limiting portion 114. A horizontal through hole 115 communicating with the third slot 112 is provided on the bottom surface of the lower shell 29, aligned with the inner side of the third slot 112. An L-shaped opening 116 is provided at the front or rear end of the inner side of the insert 113. The limiting portion 114 is the insert 113 portion at the L-shaped opening 116. Each insert 113 has a protrusion 117 that can extend into the horizontal through hole 115. The number of inserts 113 is set to at least one. The inner bottom front and rear sides of the lower shell 29... A transverse long groove 118 is provided, and a fifth spring 119 is transversely arranged inside the transverse long groove 118. A second cover plate 120 is detachably provided inside the lower shell 29 to cover the transverse long groove 118 and the fifth spring 119. A left opening groove 121 and a right opening groove 122 for inserting a locking rail 126 are longitudinally provided through the bottom surface of the lower shell 29. Multiple second locking blocks 123 for locking the locking rail 126 are provided on the outer side of the left opening groove 121 and the right opening groove 122. The left part of the transverse long groove 118 communicates with the right opening groove 122. The lower left part of the fifth spring 119 extends into the right opening groove 122. The front end and the rear end of the cover plate are respectively fixed to the lower shell 29 by a third screw 124. A cylindrical boss 125 is provided on the inner wall of the transverse long groove 118, and the fifth spring 119 is sleeved on the cylindrical boss 125.

[0052] In this embodiment, when assembling the mounting plate 110, the insert 113 is first inserted into the third slot 112. After it is fully inserted, the limiting portion 114 at the L-shaped opening 116 is bent upwards with a tool (pliers, pry bar, etc.) so that the limiting portion 114 enters the horizontal through hole 115. In this way, when the mounting plate 110 is pulled out through the second mounting hole 111 to install the screw, the limiting portion 114 will abut against the inner wall of the horizontal through hole 115, preventing the mounting plate 110 from falling out completely and thus playing a limiting role. In addition, the insert 113 is provided with a protrusion 117 that can extend into the horizontal through hole 115 to prevent the mounting plate 110 from sliding out under normal conditions. When installing the product, the exposed part of the fifth spring 119 is pressed against the retaining rail 12. Then push it to the other side to lock the second locking block 123 of the lower shell 29 onto the locking rail 126 to complete the fixation (the locking rail 126 is inserted into the left opening slot 121 and the right opening slot 122). At this time, the two fifth springs 119 abut against the locking rail 126. When the operating mechanism of the electrical switch is activated or subjected to external impact, the fifth springs 119 have a buffering effect, which makes the electrical switch have a shock absorption effect, preventing the internal parts from vibrating and increasing the service life. In addition, the second cover plate 120 can cover the transverse long slot 118 and the fifth springs 119 to prevent the fifth springs 119 from falling out. The cylindrical boss 125 can prevent the fifth springs 119 from falling out before the second cover plate 120 is closed.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A control and protection switching device, comprising a detachably connected upper housing and a lower housing, characterized in that: The upper shell contains an electromagnetic mechanism and an operating mechanism, and the lower shell contains a contact mechanism that is linked to the electromagnetic mechanism and the operating mechanism. The operating mechanism includes a first housing and a first cover plate that are detachably connected. The first housing contains a closing / opening push rod, a short-circuit push rod, and a first rotating shaft that extends out of the first housing. The first housing also contains a closing / opening micro switch and a short-circuit alarm micro switch. The lower end of the first rotating shaft can be linked with the closing / opening push rod and the short-circuit push rod. The closing / opening push rod can be linked with the closing / opening micro switch, and the short-circuit push rod can be linked with the short-circuit alarm micro switch. The lower end of the short-circuit push rod has multiple first protrusions that are linked to the contact mechanism.

2. The control and protection switchgear according to claim 1, characterized in that: The short-circuit push rod has multiple limiting sliders at both its front and rear ends. The first cover plate has a first sliding groove for inserting and moving the limiting sliders. A first spring is provided between the short-circuit push rod and the first housing to move the short-circuit push rod to the right. An opening is provided at the left end of the short-circuit push rod, and the connecting / disconnecting push rod is movably inserted into the opening. A second spring is provided between the connecting / disconnecting push rod and the first housing to move the connecting / disconnecting push rod to the right. The front and rear ends of the connecting / disconnecting push rod have sleeves extending towards the short-circuit push rod. The first housing, the short-circuit push rod, and the connecting / disconnecting push rod have a first column for accommodating the first and second springs. The lower end of the first rotating shaft has a first protrusion that can push the connecting / disconnecting push rod and a second protrusion that can push the short-circuit push rod. The short-circuit push rod... The upper right side is provided with a first protrusion that accommodates the second protrusion. The upper part of the first rotating shaft inside the first housing is provided with an upper cam, and a latch that can hook one end of the upper cam is hinged inside the first housing. The latch is fitted with a first torsion spring that causes it to rotate counterclockwise. The first rotating shaft is fitted with a second torsion spring that causes it to rotate counterclockwise. The torque of the second torsion spring is greater than the elastic force of the second spring. The first housing is provided with a flat plate through which the first rotating shaft passes. The first rotating shaft above the flat plate is provided with a first locking block. The left and right sides of the flat plate are provided with locking plates that can block the first locking block. The upper part of the first housing and the first cover plate are detachably connected by multiple screws. The lower sides of the left and right ends of the first cover plate are provided with first insert blocks. The first housing is provided with a first insertion hole for inserting the first insert block.

3. A control and protection switching device according to claim 2, characterized in that: A first indicator is rotatably connected to the upper part of the outer wall of the first housing. The upper end of the first indicator is provided with a mark that can be aligned with the indicator window of the upper housing, and the lower part is linked with the short-circuit push rod. The middle part of the first indicator is provided with a round hole, through which a first screw is screwed to the first housing. The first screw has a sleeve part that allows the first indicator to rotate. The lower part of the first housing is provided with a first through hole that allows the first indicator to be inserted and moved. The lower part of the first indicator is provided with a first strip-shaped through hole. The short-circuit push rod is provided with a second column that can move within the first strip-shaped through hole. The upper end of the first rotating shaft is provided with a handle cam for installing a handle. The handle is provided with a first slot that allows the protrusion of the handle cam to be inserted, and the lower end of the handle is provided with multiple first buckles. The handle cam is provided with a first buckle hole that engages with the first buckle.

4. A control and protection switching device according to claim 3, characterized in that: The electromagnetic mechanism includes a housing and a base detachably connected by multiple second snap-fits. A coil frame, a magnetic yoke, and an armature are disposed between the housing and the base. A coil is wound around the coil frame. The magnetic yoke is fixed to the upper part of the housing. The armature can move up and down and is detachably connected to a fixing plate. Third springs are disposed between the front and rear sides of the fixing plate and the housing. The inner wall of the housing has an upper positioning groove for inserting the upper part of the third spring. The fixing plate has a lower positioning groove for inserting the lower part of the third spring. The fixing plate has a groove for inserting the lower part of the armature, and a second through hole is provided through the fixing plate. The armature has a third through hole communicating with the second through hole. An elastic plate is disposed within the second through hole, with both ends of the elastic plate abutting against… The third through hole is provided, and the elastic plate is provided with second strip-shaped through holes on both sides. The third through hole is provided with a second protrusion that can be inserted into and move within the second strip-shaped through hole. The base is provided with guide holes on both sides. The fixing plate is provided with guide blocks that can be inserted into and move within the guide holes. The outer side of the outer shell is provided with multiple third pillars, and the third pillars are provided with internal threaded holes. The front and rear sides of the magnetic yoke are provided with detachable fixing members. The left and right sides of the fixing members are provided with second slots, and the fixing members and the outer shell are detachably connected. The magnetic yoke is provided with a protruding shaft that can be inserted into the second slot. The front and rear sides of the outer shell are provided with fourth through holes that allow the fixing members to enter and exit. The upper end of the coil frame is provided with a wall plate that can block the fourth through hole. The wall plate can abut against the fixing member.

5. A control and protection switching device according to claim 4, characterized in that: The outer casing is provided with a circular boss and a third insertion hole. A second indicator is fitted on the circular boss. The inner wall of the second indicator is provided with a circular groove. A torsion spring that causes the indicator to rotate clockwise is placed in the circular groove. One end of the torsion spring abuts against the inner wall of the indicator and the other end is inserted into the third insertion hole. The outer casing is provided with a shaft vertically. The upper end of the second indicator has a top cover. The upper end of the top cover has an indicator mark. The shaft is provided vertically through the outer casing. The upper end of the shaft abuts against the outer side of the lower end of the top cover and the lower end abuts against a fixing plate. The outer casing is provided with a limiting boss located below the circular boss. The lower end of the indicator has a stop arm that abuts against the right end of the limiting boss.

6. A control and protection switching device according to claim 5, characterized in that: The contact mechanism includes multiple third housings and an electromagnet, contact support, and mutually aligned stationary and moving contacts housed within the third housings. The stationary contacts are located on stationary contact plates, which pass through the left side of the third housings. The moving contacts are located at the lower left end of a moving contact bridge, with the middle of the moving contact bridge hinged within the third housings. The moving contact bridge is equipped with an elastic element that causes it to rotate counterclockwise. The moving iron core of the electromagnet can abut against the right end of the moving contact bridge. The contact support passes through the upper side of the third housings, with its upper end abutting against a fixed plate and its lower end abutting against the upper right side of the moving contact bridge. The electromagnet includes a fourth housing and a coil frame, coil, and a fourth housing housed within the fourth housing. A return spring is provided between the stationary and moving iron cores. The core is provided with a push rod that can abut against the right end of the moving contact bridge. The moving iron core can pass through one side of the fourth housing. The fourth housing is movably provided with a limiting member that can block the moving iron core. A second screw is screwed onto the fourth housing. The front end of the limiting member is provided with a circular hole that allows the second screw to pass through. The diameter of the circular hole is larger than the diameter of the second screw shank and smaller than the diameter of the second screw head. The rear end of the limiting member is provided with a downwardly bent limiting rod. The middle part of the limiting member is provided with a second boss. A fourth spring that abuts against the inner wall of the housing is sleeved on the second boss. The limiting rod can abut against the side wall of the moving iron core or block the rear end of the moving iron core. The rear section of the limiting member is provided with a reset rod that bends upward and abuts against the first protrusion. The fourth housing is provided with a through hole that allows the reset rod to pass through and move.

7. A control and protection switching device according to claim 6, characterized in that: The third housing contains a first shaft and a second shaft. The middle part of the movable contact bridge is sleeved on the first shaft. The elastic element is a tension spring, with its upper end hooked to the left side of the movable contact bridge and its lower end hooked to the second shaft. A support member is provided on the right side of the movable contact bridge, with its upper surface higher than the plane of the movable contact bridge. The lower end of the contact support abuts against the upper surface of the support member. The movable contact bridge and the support member are fixed by multiple rivets. The push rod can abut against the right end face of the support member. A number of arc-extinguishing grid plates are arranged sequentially from top to bottom inside the third housing. The arc-extinguishing grid plates are inclined downwards from left to right, are parallel to each other, and there are nine arc-extinguishing grid plates in total. The right end of the plate is provided with an arc-inducing opening that allows the movable contact bridge to move. The length of the lowest arc-extinguishing grid plate is shorter than the length of the other arc-extinguishing grid plates. The third housing is provided with a cover that covers the arc-extinguishing grid plates. Multiple second inserts are provided on the front and rear sides of the arc-extinguishing grid plates. The cover is provided with a second insertion hole for inserting the second inserts. The third housing is provided with a groove for placing the cover. The third housing is provided with a curtain that blocks the exhaust port. The curtain is made of flexible material. The third housing includes a front shell and a rear shell arranged opposite each other. The front shell and the rear shell are provided with multiple first mounting holes that are aligned with each other. Bolts are passed through the first mounting holes, and nuts are screwed to the other end of the bolts.

8. A control and protection switching device according to claim 7, characterized in that: The upper and lower shells are detachably connected by multiple third snap fasteners. The bottom surface of the lower shell has mounting plates on both sides, and the mounting plates have multiple second mounting holes. The bottom surface of the lower shell has third slots on both sides. The mounting plates have inserts that can be inserted into the third slots. The inserts have limiting portions. The bottom surface of the lower shell has a horizontal strip-shaped through hole that communicates with the third slot at a position aligned with the inside of the third slot. The front or rear end of the inner side of the insert has an L-shaped opening. The limiting portion is the insert portion at the L-shaped opening. The insert has a protrusion that can extend into the horizontal strip-shaped through hole. The number of inserts is set to at least one.

9. A control and protection switching device according to claim 8, characterized in that: The lower shell has transverse grooves on the front and rear sides of its inner bottom. A fifth spring is transversely arranged in the transverse grooves. A second cover plate is detachably provided inside the lower shell to cover the transverse grooves and the fifth spring. The bottom surface of the lower shell has a left opening groove and a right opening groove that accommodate the insertion of a locking rail. Multiple second locking blocks that can lock the locking rail are provided on the outer side of the left opening groove and the right opening groove. The left part of the transverse groove is connected to the right opening groove. The lower left part of the fifth spring extends into the right opening groove. The front and rear ends of the cover plate are fixed to the lower shell by third screws. A cylindrical boss is provided on the inner wall of the transverse groove. The fifth spring is sleeved on the cylindrical boss.

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