Contact device with copper tungsten block

Abstract

The utility model relates to the technical field of on-load tap-changers, in particular to a contact device with a copper-tungsten block, which comprises a base disc, the base disc is provided with a moving contact structure and a static contact structure which are used for controlling the on-off of a circuit, the moving contact structure is rotatably connected to the base disc, the static contact structure is slidably provided with a common contact and a copper-tungsten contact, and the common contact is rotatably connected to the base disc. A plurality of common contacts are vertically stacked, the copper-tungsten contact abuts against the common contact at the lowest layer, the copper-tungsten contact protrudes out of the common contact by a width L, a conducting plate surface is arranged on the moving contact structure, and when the conducting plate surface on the moving contact structure swings to be close to the static contact structure, the protruding copper-tungsten contact preferentially makes contact with the conducting plate surface and is conducted with the conducting plate surface; when the circuit is disconnected, the common contact is separated from the conducting plate surface firstly, and the copper-tungsten contact is finally separated from the conducting plate surface, so that the electric arc is mainly concentrated on the copper-tungsten contact, the ablation and damage of the electric arc to the common contact are reduced, and the service life of the tap switch is further prolonged.

Description

Technical Field

[0001] This application relates to the field of on-load tap changer technology, and in particular to a contact device with a copper-tungsten block. Background Technology

[0002] Currently, in power systems, tap changers are important devices used to regulate transformer voltage, especially in the application of on-load tap changers in converter transformers. Their working environment is extremely complex. Due to the high current and voltage levels of converter transformers, electric arcing is easily generated when the moving and stationary contacts of the tap changer open and close during the switching process.

[0003] This type of electric arc not only causes a sharp rise in the surface temperature of the contacts, but may also lead to problems such as contact erosion, seriously affecting the electrical performance and service life of the switch, and there are areas for improvement. Utility Model Content

[0004] In order to extend the service life of tap changers, this application provides a contact device with a copper-tungsten block.

[0005] This application provides a contact device with a copper-tungsten block, which adopts the following technical solution:

[0006] A contact device with a copper-tungsten block includes a base plate. The base plate has a moving contact structure for controlling the on / off state of a circuit and a stationary contact structure for communicating with the moving contact structure. The moving contact structure is rotatably connected to the base plate. The stationary contact structure has ordinary contacts and copper-tungsten contacts slidably disposed thereon. Several ordinary contacts are vertically stacked, and the copper-tungsten contacts abut against the lowest layer of ordinary contacts, with the copper-tungsten contacts protruding a width L beyond the ordinary contacts. The moving contact structure has a conductive plate surface, and both the ordinary contacts and the copper-tungsten contacts can contact and communicate with the conductive plate surface.

[0007] By adopting the above technical solution, the moving contact structure is rotatably connected to the base plate. The moving contact structure makes contact with the stationary contact structure by swinging, thereby controlling the opening and closing of the circuit. When the conductive plate surface on the moving contact structure is close to the stationary contact structure, the protruding copper-tungsten contact first contacts the conductive plate surface and conducts the circuit. When the circuit is broken, the ordinary contact separates from the conductive plate surface first, and the copper-tungsten contact separates from the conductive plate surface last. This makes the electric arc mainly concentrated on the copper-tungsten contact. Since the copper-tungsten contact has high resistance to electric arc erosion, it effectively protects the ordinary contact, reduces the burning and damage of the ordinary contact by the electric arc, and thus extends the service life of the tap changer.

[0008] Preferably, the conductive plate surface of the moving contact structure is provided with a copper-tungsten block for contacting and communicating with the copper-tungsten contact, and the copper-tungsten block and the copper-tungsten contact form an abutting fit.

[0009] By adopting the above technical solution, the copper-tungsten block and the copper-tungsten contact form an abutting fit, which further ensures that the electric arc is mainly concentrated on the copper-tungsten block and the copper-tungsten contact when the circuit is switched on or off. This fully utilizes the excellent properties of the copper-tungsten alloy and effectively solves the problem of tap changer contact erosion under high voltage and high current conditions.

[0010] Preferably, the moving contact structure includes a fixed base and a main on / off contact rotatably connected to the fixed base. The fixed base is disposed on the base plate, and the conductive plate is disposed on the main on / off contact.

[0011] By adopting the above technical solution, and utilizing the fixed base and the main switching contact, the fixed base provides stable support for the rotation of the main switching contact, so that the conductive plate surface on the main switching contact can accurately contact and conduct or separate from ordinary contacts and copper-tungsten contacts, thereby controlling the on and off of the circuit and improving the operating accuracy and reliability of the moving contact structure.

[0012] Preferably, the stationary contact structure includes an insulating support, a rear plate, side plates disposed on both sides of the insulating support, and pins for connecting the side plates to the insulating support. The insulating support is disposed on a base plate, the copper-tungsten contact is disposed on the insulating support, and both sides of the copper-tungsten contact and both sides of the ordinary contact abut against the side plates. The rear plate is disposed on the side of the insulating support opposite to the ordinary contact, and both sides of the rear plate abut against the side plates. The pins pass through the side plates and the insulating support.

[0013] By adopting the above technical solution, the insulating bracket provides a stable support foundation for the entire stationary contact structure. At the same time, the side plates are symmetrically arranged on both sides of the insulating bracket, which laterally limit the movement of the ordinary contact and the copper-tungsten contact during the sliding process. The two sides of the rear plate form an abutment fit with the side plates, which enhances the stability of the entire stationary contact structure and ensures that the current is stably transmitted through the stationary contact structure.

[0014] Preferably, the ordinary contact is provided with a first oblong hole, and the copper-tungsten contact is provided with a second oblong hole. The length of the first oblong hole is longer than the length of the second oblong hole, and a linkage rod is vertically provided in both the first oblong hole and the second oblong hole. The two ends of the linkage rod are respectively fixedly connected to the insulating bracket.

[0015] By adopting the above technical solution, the cooperation between the linkage rod and the first and second oblong holes provides guidance for the sliding of the ordinary contact and the copper-tungsten contact, ensuring the accuracy and stability of the ordinary contact and the copper-tungsten contact during the sliding process. At the same time, by setting the first and second oblong holes of different lengths, the order of the ordinary contact and the copper-tungsten contact during the sliding process is ensured, so that the two can better cooperate during operation and ensure the overall performance of the contact device.

[0016] Preferably, a cover is fitted on the pin, a sleeve is provided at the end of the pin away from the sleeve, a first spring is fitted between the cover and the side plate, and a second spring is fitted between the sleeve and the side plate.

[0017] By adopting the above technical solution, when the stationary contact structure is subjected to vibration or impact, the first spring and the second spring can absorb the impact force, reducing the risk of wear or damage to the side plate, thereby protecting the structural integrity and electrical performance of the stationary contact structure; at the same time, the setting of the cover and the sleeve together restricts the range of movement of the pin in the axial direction, ensuring that the pin will not fall off from the side plate and the insulating support, and further ensuring that the spring can properly perform its buffering and elastic adjustment functions.

[0018] Preferably, the ordinary contact is provided with a first connecting post on the side away from the moving contact structure, and a first return spring is sleeved on the first connecting post. One end of the first return spring abuts against the ordinary contact, and the other end of the first return spring abuts against the side wall of the pin.

[0019] By adopting the above technical solution, and utilizing the first connecting post and the first return spring, the ordinary contact can quickly return to its initial position after each separation from the conductive plate surface through the elastic force of the first return spring on the first connecting post. This ensures that the ordinary contact can accurately contact the moving contact when the circuit is switched on or off next time, thus guaranteeing the reliability of the circuit connection.

[0020] Preferably, a second connecting post is provided on the side of the copper-tungsten contact away from the moving contact structure, and a second return spring is sleeved on the second connecting post. One end of the second return spring abuts against the copper-tungsten contact, and the other end of the second return spring abuts against the side wall of the pin.

[0021] By adopting the above technical solution, and utilizing the second connecting post and the second return spring, the copper-tungsten contact can reliably return to its initial position after each separation from the copper-tungsten block through the elastic force of the second return spring on the second connecting post, ensuring that the copper-tungsten contact can accurately contact the copper-tungsten block on the moving contact structure when the circuit is switched on and off next time.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The moving contact structure is rotatably connected to the base plate. The moving contact structure makes contact with the stationary contact structure by swinging, thereby controlling the opening and closing of the circuit. When the conductive plate on the moving contact structure is close to the stationary contact structure, the protruding copper-tungsten contact will first contact the conductive plate and conduct the circuit. When the circuit is broken, the ordinary contact separates from the conductive plate first, and the copper-tungsten contact separates from the conductive plate last. This makes the electric arc mainly concentrated on the copper-tungsten contact. Since the copper-tungsten contact has high resistance to electric arc erosion, it effectively protects the ordinary contact, reduces the burning and damage of the ordinary contact by the electric arc, and thus extends the service life of the tap changer.

[0024] 2. By utilizing the contact fit between the copper-tungsten block and the copper-tungsten contact, the electric arc is mainly concentrated on the copper-tungsten block and the copper-tungsten contact when the circuit is switched on or off. This fully utilizes the excellent properties of the copper-tungsten alloy and effectively solves the problem of tap changer contact erosion under high voltage and high current conditions.

[0025] 3. The linkage rod, in conjunction with the first and second oblong holes, provides guidance for the sliding of the ordinary contact and the copper-tungsten contact, ensuring their accuracy and stability during the sliding process. Simultaneously, the use of different lengths for the first and second oblong holes ensures the sequential sliding of the ordinary contact and the copper-tungsten contact, allowing them to work together better and guaranteeing the overall performance of the contact device. Attached Figure Description

[0026] Figure 1 This is an isometric schematic diagram of the main overall structure in the embodiments of this application;

[0027] Figure 2 This is a schematic diagram of the main static contact structure in the embodiments of this application;

[0028] Figure 3 This embodiment of the application mainly reflects the mating relationship between ordinary contacts, copper-tungsten contacts, and pins;

[0029] Figure 4 This is a partial exploded view of the main cooperative relationship between the ordinary contact, the copper-tungsten contact, and the linkage rod in the embodiments of this application.

[0030] Reference numerals: 1. Base plate; 11. Rotating shaft; 2. Contact module; 21. Moving contact structure; 211. Fixed base; 212. Main on / off contact; 2121. Conductive plate surface; 2122. Copper-tungsten block; 22. Stationary contact structure; 221. Insulating bracket; 2211. Limiting hole; 222. Side plate; 223. Rear plate; 224. Pin; 2241. Cover; 2242. Sleeve; 2243. First spring; 2244. Second spring; 225. Ordinary contact; 2251. First oblong hole; 2252. First connecting post; 2253. First return spring; 226. Copper-tungsten contact; 2261. Second oblong hole; 2262. Second connecting post; 2263. Second return spring; 227. Linkage rod. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail.

[0032] This application discloses a contact device with a copper-tungsten block.

[0033] Reference Figure 1 A contact device with a copper-tungsten block includes a base plate 1, on which contact modules 2 are symmetrically arranged. Each contact module 2 includes a moving contact structure 21 and a stationary contact structure 22. The base plate 1 is made of a circular insulating material. In this embodiment, the insulating material is plastic.

[0034] Reference Figure 1 The base plate 1 has a rotating shaft hole for mounting the moving contact structure 21. A rotating shaft 11 is installed in the rotating shaft hole of the base plate 1. The moving contact structure 21 includes a fixed seat 211 and a main on / off contact 212. The fixed seat 211 is fixed to the base plate 1 by bolts. The main on / off contact 212 is rotatably connected to the fixed seat 211 through the rotating shaft 11. The end of the main on / off contact 212 is provided with a symmetrical conductive plate surface 2121. A copper-tungsten block 2122 is embedded at the bottom of any conductive plate surface 2121.

[0035] Reference Figure 1 There are two stationary contact structures 22 corresponding to the conductive plate surface 2121. The stationary contact structures 22 are respectively set on both sides of the moving contact structure 21. Since the structure and connection method of the two stationary contact structures 22 are the same, we will now take one of the stationary contact structures 22 as an example for explanation.

[0036] Reference Figure 1 and Figure 2The stationary contact structure 22 includes an insulating bracket 221, a side plate 222, a rear plate 223, and a pin 224. The insulating bracket 221 is a U-shaped plastic part and is fixed to the base plate 1 by bolts. A common contact 225 and a copper-tungsten contact 226 for abutting with the copper-tungsten block 2122 are slidably arranged at the U-shaped opening of the insulating bracket 221. Both the common contact 225 and the copper-tungsten contact 226 are T-shaped. Several common contacts 225 are vertically stacked. In this embodiment, five are arranged. The copper-tungsten contact 226 is arranged below the stacked common contacts 225, and the upper surface of the copper-tungsten contact 226 abuts with the lower surface of the bottommost common contact 225. The copper-tungsten contact 226 protrudes outward by a width L compared to the common contact 225. In this embodiment, the width L is set to 2mm.

[0037] Reference Figure 1 and Figure 2 The main switching contact 212 is rotatably connected to the fixed base 211 via the rotating shaft 11. The main switching contact 212 swings to make the conductive plate surface 2121 connected or disconnected from the ordinary contact 225 and the copper-tungsten contact 226, thereby precisely controlling the circuit's on / off state. When the conductive plate surface 2121 on the moving contact structure 21 approaches the stationary contact structure 22, the protruding copper-tungsten contact 226 preferentially contacts the copper-tungsten block 2122 on the conductive plate surface 2121 and makes the circuit connected. When the circuit is disconnected, the ordinary contact 225 first separates from the conductive plate surface 2121, and the copper-tungsten contact 226 finally separates from the copper-tungsten block 2122, so that the electric arc is mainly concentrated on the copper-tungsten block 2122 and the copper-tungsten contact 226.

[0038] Reference Figure 1 and Figure 2 Utilizing the high resistance to welding and high resistance to arc erosion of copper-tungsten alloy materials, the protruding copper-tungsten contact 226 cooperates with the copper-tungsten block 2122 when an arc is generated at the moment of circuit switching, which reduces the burning and damage of the ordinary contact 225 by the arc, effectively improves the service life of the tap changer, and provides a strong guarantee for the stable operation of the power system.

[0039] Reference Figure 1 and Figure 2 In order to provide stable support and limit the stacked ordinary contacts 225 and copper-tungsten contacts 226, side plates 222 are provided on both sides of the copper-tungsten contacts 226 and on both sides of any ordinary contact 225. The side plates 222 are set according to the thickness and number of ordinary contacts 225 and copper-tungsten contacts 226. The side plates 222 on both sides of the same ordinary contact 225 and the side plates 222 on both sides of the same copper-tungsten contact 226 are respectively set as a set of side plates 222. Any set of side plates 222 is fixed to both sides of the insulating bracket 221 by pins 224. The pins 224 pass through the side plates 222 and the insulating bracket 221, thereby firmly installing the side plates 222 on the insulating bracket 221.

[0040] Reference Figure 1 and Figure 2 The adjacent side plates 222 abut against each other vertically. The topmost side plate 222 is fixed to the insulating bracket 221 by bolts. Since the copper-tungsten contact 226 is installed on the insulating bracket 221, its two sides abut against the side plate 222. At the same time, the two sides of each ordinary contact 225 also abut against the side plate 222, thereby laterally limiting the ordinary contact 225 and the copper-tungsten contact 226 during the sliding process, ensuring that the ordinary contact 225 and the copper-tungsten contact 226 remain stable during the sliding process and are not prone to lateral displacement.

[0041] Reference Figure 2 Two pins 224 are spaced apart on any side plate 222. The two pins 224 further enhance the stability and positioning accuracy of the side plate 222. Compared with a single pin 224, the two pins 224 can better restrict the relative position between the side plate 222 and the insulating support 221, preventing the side plate 222 and the insulating support 221 from twisting or shifting. This ensures the stability and accuracy of the ordinary contact 225 and the copper-tungsten contact 226 during the sliding process, and improves the working reliability of the entire contact device.

[0042] Reference Figure 2 and Figure 3 One end of the pin 224 is integrally formed with a cover 2241. The end of the pin 224 away from the cover 2241 is fitted with a sleeve 2242. A first spring 2243 is provided between the cover 2241 and the side plate 222. The first spring 2243 is fitted on the pin 224. One end of the first spring 2243 forms an abutting engagement with the cover 2241, and the other end of the first spring 2243 forms an abutting engagement with the side plate 222. A second spring 2244 is provided between the sleeve 2242 and the side plate 222. The second spring 2244 is fitted on the pin 224. One end of the second spring 2244 forms an abutting engagement with the sleeve 2242, and the other end of the second spring 2244 forms an abutting engagement with the side plate 222.

[0043] Reference Figure 1 and Figure 2 When the main switching contact 212 is opened or closed, the contact or separation between the main switching contact 212 and the ordinary contact 225 and the copper-tungsten contact 226 will generate a large impact force. The first spring 2243 and the second spring 2244 can play a buffering role in this situation, reducing the risk of wear or damage between the side plate 222 and the insulating support 221, thereby protecting the structural integrity and electrical performance of the stationary contact structure 22. At the same time, the cover 2241 and the sleeve 2242 together ensure that the pin 224 will not come out of the side plate 222 and the insulating support 221, ensuring the stability of the position of the pin 224.

[0044] Reference Figure 2 The back plate 223 is located on the side of the insulating bracket 221 away from the ordinary contact 225, and the two sides of the back plate 223 form an abutting fit with the side plate 222, which further enhances the stability and integrity of the entire stationary contact structure 22, so that all components are tightly connected together, ensuring that the current is stably transmitted through the stationary contact structure 22.

[0045] Reference Figure 2 and Figure 4 The ordinary contact 225 has a first oblong hole 2251 with a length of 15mm, and the copper-tungsten contact 226 has a second oblong hole 2261 with a length of 10mm. During assembly, the first oblong hole 2251 and the second oblong hole 2261 will be precisely overlapped and aligned. A linkage rod 227 is vertically arranged in both the first oblong hole 2251 and the second oblong hole 2261. The insulating bracket 221 has two symmetrically arranged limiting holes 2211 for limiting the linkage rod 227. The two ends of the linkage rod 227 are respectively inserted into the limiting holes 2211 of the insulating bracket 221. Then, the ordinary contact 225 and the copper-tungsten contact 226 are guided and slid through the linkage rod 227, ensuring the accuracy and stability of the ordinary contact 225 and the copper-tungsten contact 226 during the sliding process.

[0046] Reference Figure 3 and Figure 4 The ordinary contact 225 has a first connecting post 2252 integrally formed on the side away from the moving contact structure 21. A first return spring 2253 is sleeved on the first connecting post 2252. One end of the first return spring 2253 abuts against the ordinary contact 225, and the other end of the first return spring 2253 abuts against the side wall of the pin 224.

[0047] Reference Figure 1 and Figure 3 After the ordinary contact 225 separates from the conductive plate surface 2121 each time, the ordinary contact 225 quickly returns to its initial position by the elastic force of the first reset spring 2253 on the first connecting post 2252, ensuring that the ordinary contact 225 can accurately contact the conductive plate surface 2121 when the circuit is turned on or off next time, thus ensuring the reliability of the circuit connection.

[0048] Reference Figure 3 and Figure 4 The copper-tungsten contact 226 has a second connecting post 2262 integrally formed on the side away from the moving contact structure 21. The length of the second connecting post 2262 is shorter than the length of the first connecting post 2252. A second return spring 2263 is sleeved on the second connecting post 2262. One end of the second return spring 2263 abuts against the copper-tungsten contact 226, and the other end of the second return spring 2263 abuts against the side wall of the pin 224.

[0049] Reference Figure 1 and Figure 3 After the copper-tungsten contact 226 separates from the copper-tungsten block 2122 each time, the copper-tungsten contact 226 can return to its initial position by the elastic force of the second reset spring 2263 on the second connecting post 2262, ensuring that the copper-tungsten contact 226 can accurately contact the copper-tungsten block 2122 on the moving contact structure 21 when the circuit is turned on or off next time, thereby giving full play to the advantages of copper-tungsten material in the contact device.

[0050] The implementation principle of this application embodiment is as follows:

[0051] Closing process: The main on / off contact 212 rotates as needed, so that the copper-tungsten block 2122 on the main on / off contact 212 first contacts the copper-tungsten contact 226, and then the copper-tungsten block 2122 and the copper-tungsten contact 226 form a connection. Then the main on / off contact 212 continues to move backward to contact the copper-tungsten contact 226 until the conductive plate surface 2121 contacts the ordinary contact 225 and forms a connection. Multiple ordinary contacts 225 slide synchronously under the guidance of the linkage rod 227. While achieving multi-stage conduction, the electric arc is mainly concentrated on the copper-tungsten block 2122 and the copper-tungsten contact 226.

[0052] Breaking process: When the conductive plate surface 2121 on the main on / off contact 212 is opened, the ordinary contact 225 is preferentially separated from the conductive plate surface 2121 under the action of the first return spring 2253, while the copper-tungsten contact 226 is delayed in separation, so that the electric arc is concentrated on the copper-tungsten contact 226 and the copper-tungsten block 2122. The high arc resistance of the copper-tungsten material is used to reduce ablation and extend the service life of the tap changer.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A contact device with a copper tungsten block, characterized by: The utility model provides a contactor, including base disk (1), be provided with movable contact structure (21) for controlling circuit on-off and static contact structure (22) for with movable contact structure (21) conduction on base disk (1), movable contact structure (21) is rotatably connected on base disk (1), static contact structure (22) is provided with common contact (225) and copper tungsten contact (226) on the slip, common contact (225) is vertically stacked with several, copper tungsten contact (226) is butt joint with the common contact (225) of the lowermost layer, and copper tungsten contact (226) is protruding width L than common contact (225), movable contact structure (21) is provided with conduction board surface (2121), and common contact (225) and copper tungsten contact (226) can be contacted with conduction board surface (2121) conduction.

2. A contact device with a copper tungsten block according to claim 1, characterized in that: The conduction board surface (2121) of the movable contact structure (21) is provided with a copper tungsten block (2122) for contacting and conducting with the copper tungsten contact (226), and the copper tungsten block (2122) is in abutting engagement with the copper tungsten contact (226).

3. A contact device with a copper tungsten block according to claim 1, characterized in that: The movable contact structure (21) comprises a fixed seat (211) and a main on-off contact (212) rotatably connected to the fixed seat (211), the fixed seat (211) is arranged on the base disk (1), and the conduction board surface (2121) is arranged on the main on-off contact (212).

4. The contact device with a copper tungsten block according to claim 1, characterized in that: The static contact structure (22) comprises an insulating support (221), a back plate (223), side plates (222) arranged on both sides of the insulating support (221), and a latch (224) for connecting the side plates (222) to the insulating support (221), the insulating support (221) is arranged on the base disk (1), the copper tungsten contact (226) is arranged on the insulating support (221), both sides of the copper tungsten contact (226) and both sides of the common contact (225) are in abutting engagement with the side plates (222), the back plate (223) is arranged on a side of the insulating support (221) away from the common contact (225), both sides of the back plate (223) are in abutting engagement with the side plates (222), and the latch (224) penetrates the side plates (222) and the insulating support (221).

5. A contact assembly with a copper tungsten block according to claim 4, characterized in that: The common contact (225) is provided with a first waist-shaped hole (2251), the copper tungsten contact (226) is provided with a second waist-shaped hole (2261), the length of the first waist-shaped hole (2251) is longer than the length of the second waist-shaped hole (2261), a linkage rod (227) is vertically arranged in the first waist-shaped hole (2251) and the second waist-shaped hole (2261), and both ends of the linkage rod (227) are fixedly connected to the insulating support (221).

6. A contact device with a copper tungsten block according to claim 4, characterized in that: The latch (224) is sleeved with a cover (2241), one end of the latch (224) away from a sleeve (2242) is provided with the sleeve (2242), a first spring (2243) is sleeved between the cover (2241) and the side plate (222), and a second spring (2244) is sleeved between the sleeve (2242) and the side plate (222).

7. A contact assembly with a copper tungsten block according to claim 4, characterized in that: The side of the common contact (225) away from the movable contact structure (21) is provided with a first connecting column (2252), a first reset spring (2253) is sleeved on the first connecting column (2252), one end of the first reset spring (2253) abuts against the common contact (225), and the other end of the first reset spring (2253) abuts against the side wall of the latch (224).

8. A contact device with a copper tungsten block according to claim 4, characterized in that: The side of the copper tungsten contact (226) away from the movable contact structure (21) is provided with a second connecting column (2262), a second reset spring (2263) is sleeved on the second connecting column (2262), one end of the second reset spring (2263) abuts against the copper tungsten contact (226), and the other end of the second reset spring (2263) abuts against the side wall of the latch (224).

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