Surge protection device

Abstract

The utility model provides a surge protection device (100). The surge protection device (100) comprises a carrier (3); a discharge unit (16); a first lead frame (20); a second lead frame (17); a trip electrode (5); and a plate spring loaded movable trip assembly (4). In the first connection state, the first soldering region (18), the second soldering region (13) and the third soldering region (14) are connected to one another by means of a low-temperature solder (60). In a second open state, when the low temperature solder (60) melts, the trip assembly (4) is displaced in a first direction parallel to the second main surface of the discharge unit (16) such that an insulated portion of the trip assembly (4) is disposed between the first solder region (18) and the third solder region (14).

Description

Technical Field

[0001] The utility model relates to a surge protection device. Background Art

[0002] WO 2014 / 131 564 A1 discloses a disconnecting and switching circuit for overvoltage protection, which includes a dissipating element and a thermal disconnect point integrated in the electrical connection path of the dissipating element. The thermal disconnect point includes a movable conductor element, which is under mechanical prestress and, in the case of disconnection, moves from a first position to a second position. By reaching the second position, a complete electrical disconnection of the dissipating element relative to the connection path is achieved. The thermal disconnect point is formed by the movable conductor element and a fixed contact element. The movable conductor element is fixed to the fixed contact element by a thermally detachable device, and the contact element has a groove or an opening into which a finger-like extension of the movable conductor element is immersed, such that the disconnection between the groove or the opening and the finger-like extension only occurs when the second position of the movable conductor element is given.

[0003] According to the process requirements of the voltage-limiting element - zinc oxide varistor ("metal oxide varistor", MOV) of the surge protection device (SPD), in order to meet the lightning and overvoltage protection objectives of high-voltage electrical systems under the same discharge capacity, it is necessary to increase the thickness of the core discharge element - the voltage-limiting element MOV in the SPD. In order to accommodate a larger thickness of MOV, product designers need to correspondingly increase the size of the SPD to achieve an appropriate protection function.

[0004] Document WO 2010 / 023 193 A1 discloses a surge arrester, which includes at least one arrester element, such as a varistor, and a disconnecting device for disconnecting the arrester element from the power grid. The disconnecting device includes a thermal disconnect point incorporated in the electrical connection path within the arrester. A movable conductor part or a movable conducting bridge is connected to the arrester element through a disconnect point on one side, and the conductor part or the bridge is connected to the first external electrical connection of the arrester device on the other side and includes means for generating prestress. The associated force vector acts directly or indirectly in the disconnecting direction on the conductor part or the bridge through a movable disconnecting bracket. A conductive element is provided in or at the end of the movement path of the conductor part or the bridge. When the disconnecting device is triggered, the conductive element contacts the conductor part or the bridge. A movable insulating part is provided, which penetrates directly into the movement path of the conductor part or the bridge before or after reaching the short-circuit state to prevent or suppress the re-ignition of the arc between the conductive element and the disconnect point.

[0005] Chinese Utility Model CN 211 183 412 U1 teaches a 20kA photovoltaic PCB type power surge protection device. The pressure sensor includes a housing, a varistor element, a spring assembly and a pin assembly. The varistor element consists of a low-temperature pin and a high-temperature pin. The housing includes a housing, an inner housing and a slider. The pin assembly consists of a first pin, a second pin, a third pin and a fourth pin. The first pin is provided with a beryllium copper sheet and a limiting inclined surface. The beryllium copper sheet is welded to the low-temperature pin as the low-temperature trip point. The slider is installed at the limiting inclined surface, so that the first elastic arm on the third pin and the second elastic arm on the fourth pin are in close contact for remote signal conduction.

[0006] There are other overvoltage or surge protection devices whose working principle relies on the melting of low-temperature solder joints due to instantaneous high current during a caused short circuit or lightning strike, etc., so that the switching element is disengaged. In some cases, such as after the deterioration of this surge protection device, the switching electrode may not be completely disconnected from the discharge unit. In addition, the direct welding of the plate-shaped electrode leads of the discharge unit may require high manufacturing process requirements, which may lead to cumbersome assembly procedures and increase the production cost of the surge protection device.

[0007] Therefore, an improved surge protection device is needed that reliably performs disconnection and switching. In addition, the purpose of the present utility model is to simplify the manufacturing process of the SPD and reduce the size of internal components, so that the total size of the SPD can be reduced. Summary of the Utility Model

[0008] The first aspect of the present utility model provides a surge protection device. Other aspects of the present utility model are set forth in the description of the drawings and exemplary embodiments.

[0009] The surge protection device SPD according to the present utility model includes a carrier for providing a mechanical structure. The carrier provides a mechanical base for mounting other components of the SPD, such as a discharge unit and a trip assembly. Therefore, it can simplify the assembly process of the SPD and provide improved mechanical stiffness.

[0010] In addition, the carrier may include features for mounting electrodes, housings, optional indicators, discharge units, springs, etc., such as holes, slots, threads, grooves, hooks, etc. Therefore, the assembly process of the SPD can be simplified.

[0011] The discharge unit has a first terminal on its first main surface and a second terminal on its second main surface. The term discharge unit particularly refers to a device including at least one varistor provided in a package. The first terminal and the second terminal are provided on the outside of the package as leads, pads or surfaces for connection to electrodes or lead frames, etc., of the SPD.

[0012] The first lead frame has an electrode that contacts the first terminal of the discharge unit and a fixture for mounting the discharge unit to a carrier. Thus, the first lead frame combines the function of a bracket for holding the discharge unit and the function of a lead for providing electrical contact between the first terminal of the discharge unit and the first external terminal of the SPD. Therefore, the first lead frame can simplify the manufacturing process and reduce the size of the SPD.

[0013] The second lead frame contacts the second terminal of the discharge unit and includes a first welding area. This first welding area will provide a low-temperature solder joint for bonding with the second welding area of the trip assembly.

[0014] The first lead frame may have a first plug-in portion or a first external terminal for electrically and mechanically connecting the SPD to an external socket. The trip electrode may include a second plug-in portion or a second external terminal for electrically and mechanically connecting the SPD to an external socket.

[0015] The trip electrode includes a third welding area. The trip electrode is connected to the second external terminal of the SPD. Thus, the discharge unit is electrically connected between the first lead frame and the trip electrode.

[0016] The trip assembly is provided as a plate-shaped spring-loaded movable trip assembly that is arranged parallel to the second main surface of the discharge unit, located between the trip electrode and the second lead frame, and includes a second welding area. The trip assembly can move in a direction parallel to the second main surface.

[0017] When the trip assembly is triggered, it moves from a first position in the connected state to a second position in the non-connected state. At the same time, a part of the trip assembly moves between the first welding area of the second lead frame and the third welding area of the trip electrode, thereby electrically isolating them from each other.

[0018] According to a preferred embodiment, the trip assembly can be made of a PCB ("printed circuit board"), which can be manufactured at a low cost. The second welding area may be provided with a plurality of through holes to allow low-temperature solder to flow through the PCB to reach the first welding area below the trip assembly. Similarly, the trip electrode may include a plurality of holes or openings in the third welding area to allow low-temperature solder to flow to the second and first welding areas below. Thus, the first, second, and third welding areas can be connected together using low-temperature solder that melts in the case of high current to trigger the trip assembly.

[0019] In the first connected state, as described above, the first welding area, the second welding area, and the third welding area are connected to each other via low-temperature solder. The first state is the normal operating state of the SPD.

[0020] In the second off state, when the low-temperature solder melts, the trip assembly is displaced in a first direction parallel to the second major surface of the discharge unit such that the insulating portion of the trip assembly is disposed between the first and third welding areas. The second state is a fault state that occurs when a high current flows through the SPD. In the second state, the discharge unit is safely isolated from the trip electrode and thus safely isolated from the second external terminal.

[0021] According to a preferred embodiment, the trip assembly can be spring-loaded using at least one compression spring or at least one tension spring disposed between a portion of the trip assembly and the carrier. For example, a pair of springs can be used to provide uniform force on both sides of the plate-like trip assembly. In the first state, when the low-temperature solder joint melts, the spring is biased to provide a force that pushes or pulls the trip assembly into the second state. To make a mechanical connection between the spring and the trip assembly, the trip assembly can include suitable hooks or holes.

[0022] According to a preferred embodiment, the SPD can include a spring-loaded movable indicator that is movably disposed on an end face of the carrier. The indicator can provide a visual indication of the first and second states. For example, in the first state, the green portion of the indicator can be visible in a window of a lid provided above the indicator. In the second state, the red portion of the indicator can be visible in the window of the lid. At least one tension spring or compression spring can provide a force that pulls or pushes the indicator from the first state to the second state. The carrier can include suitable tracks, etc., to guide the translational movement of the indicator and can also include hooks or stoppers to limit the movement between a first position and a second position associated with the first and second states, respectively.

[0023] Preferably, in the first state, the indicator can be latched to the carrier at the first position. For this purpose, the indicator can include suitable notches that engage with hooks, etc., and vice versa. When the trip assembly moves from the first state to the second state, this engagement can be advantageously disengaged by a portion of the trip assembly.

[0024] In the second state, when the latch is released by the interaction between the tip portion of the trip assembly and the indicator, the indicator can move to the second position in a second direction perpendicular to the first direction by spring force. Thus, the movement of the trip assembly can be used to trigger the movement of the indicator, providing a simple and effective mechanism for indicating the state of the SPD.

[0025] In particular, the indicator can be slidably arranged on the outer surface of the carrier. In a preferred embodiment, the indicator is provided below the housing, and the housing may include an opening or window that displays a part of the indicator. The indicator can be in a first position or a second position. The indicator is a mechanical device that enables a user to readily grasp whether the surge protection device has been triggered. For example, when the indicator moves from the first position to the second position, the color displayed in the opening may change from green to red.

[0026] According to a preferred embodiment, the tripping assembly may include a guiding groove for guiding the linear movement of the tripping assembly in a first direction. The guiding groove may interact with a corresponding notch provided in the carrier. Additionally or alternatively, the carrier may include one or more guiding grooves that interact with corresponding notches provided in the tripping assembly. As a result, the linear movement of the tripping assembly between the first and second states can be guided along the first direction to ensure smooth movement of the tripping assembly.

[0027] Furthermore, first and second limiting surfaces for restricting the linear movement of the tripping assembly in the first direction between the first and second positions may be provided in the tripping assembly and / or the carrier. As a result, the first and second positions associated with the first and second states, respectively, can be accurately defined, and unnecessary movement beyond the first or second position can be prevented.

[0028] The carrier preferably may include a plate-like isolation portion that provides a sliding surface for the tripping assembly. When triggered, the sliding surface can provide smooth linear movement of the tripping assembly. The sliding surface may also include grooves or notches, etc., for guiding the linear movement of the tripping assembly.

[0029] The isolation portion may preferably include an opening through which a first welding area can contact a second welding area in the first state. In the second state, the isolation portion can insulate the first welding area from the second welding area, thereby preventing an arc between the respective welding areas.

[0030] According to a preferred embodiment, the surge protection device includes a housing that covers the discharge unit and the tripping assembly. The housing may include an upper housing and a lower housing. The housing can protect the SPD from environmental influences and protect the user from touching electrical components. The upper housing and the lower housing can be easily mounted onto each other, thereby simplifying the assembly process.

[0031] According to a preferred embodiment, the SPD may include a bypass fuse assembly having a fuse box that houses a first fuse and a second fuse connected in series. The fuses can provide protection against high currents that may occur in the second state.

[0032] A spring-loaded switch slider can be provided, which is held by a clamping boss of a tripping component against a spring force in a first state. In a second state, the switch slider is not held by the clamping boss and can be displaced by the spring force to bring an elastic electrode into contact with a tripping electrode, thereby providing a fault current path from a first external terminal through a first fuse and a second fuse to a second external terminal. Thus, the fault current can be safely dissipated through the bypass fuse component to prevent damage to the discharge unit and / or other components.

[0033] Advantageously, in the first state, an insulating portion of the tripping component is disposed between the elastic electrode and the tripping electrode. When the device is triggered, the linear movement of the tripping component can also trigger the slider of the bypass fuse component. Brief Description of the Drawings

[0034] The present utility model will be explained in more detail with reference to the exemplary embodiments depicted in the drawings.

[0035] The drawings are included to provide a further understanding of the present utility model and are incorporated into and constitute a part of this specification. The drawings illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model. Other embodiments of the present utility model and many of the intended advantages of the present utility model will be readily understood as they become more readily understood by reference to the following detailed description. The elements in the drawings are not necessarily drawn to scale relative to each other.

[0036] In the drawings:

[0037] Figure 1 An embodiment of a surge protection device having an internal tripping component in a normal state is shown.

[0038] Figure 2 Shows Figure 1 the surge protection device with the tripping component in an incorrect state.

[0039] Figure 3 A fault current path is shown.

[0040] Figure 4 Three states of the tripping component are shown:

[0041] Figure 4 a shows the first state of the tripping component.

[0042] Figure 4 b shows an intermediate state.

[0043] Figure 4 c shows the second state of the tripping component.

[0044] Figure 5 An exploded view of the surge protection device is shown.

[0045] Figure 6 Shows another view of the surge protection device.

[0046] Figure 7 Shows another view of the surge protection device.

[0047] Figure 8 Shows an exploded view of the bypass fuse type component.

[0048] Figure 9 Shows a view of the carrier of the surge protection device.

[0049] Figure 10 Shows another view of the carrier of the surge protection device.

[0050] Figure 11 Shows the discharge unit.

[0051] Figure 12 Shows the first lead frame.

[0052] Figure 13 Shows the second lead frame.

[0053] Figure 14 Shows the trip assembly.

[0054] Figure 15 Shows an embodiment of a surge protection device with a compression spring according to the present utility model.

[0055] Figure 16 Shows an embodiment of a surge protection device with a tension spring according to the present utility model.

[0056] Figure 17 Shows three surge protection devices installed in an external socket.

[0057] In the drawings, unless otherwise specified, the same reference numerals denote the same or functionally identical components. Detailed Description

[0058] Figures 1 to 16 Relates to the same or at least similar embodiments of the present utility model. Therefore, similar or equivalent components are denoted by the same reference numerals. Details not visible in one figure may become apparent in other figures.

[0059] Figure 1 Shows a perspective view of a surge protection device (SPD) 100 according to the present utility model in a first state (normal state). Figure 2 Shows a corresponding view of the SPD 100 in a second state (fault state), where the trip assembly 4 has moved from the first position ( Figure 1Move to the second position.

[0060] The SPD 100 includes a carrier 3, a spring-loaded and plate-shaped trip assembly 4, a trip electrode 5, a spring-loaded switch slider 6 for remotely transmitting an error status signal, and an indicator 8 slidably disposed on the front surface of the carrier 3 to move between a first position in a first state and a second position in a second state. The switch slider has a drive spring 7, a first external terminal 71 and a second external terminal 72 for connection to an external socket. Figure 1 The indicator in the first position is shown, Figure 2 The indicator 8 in the second position is shown.

[0061] As Figure 1 shown, the notch 29 passing through the guide slot 47 of the trip assembly 4 guides the linear movement of the trip assembly 4. The notch 29 can be provided, for example, on the main surface of the carrier 3. According to a preferred embodiment, the trip assembly is made of a PCB cut into a desired shape and has the required pads and vias.

[0062] When the indicator 8 moves to the second position ( Figure 2 ), the surface 10 becomes visible. By providing, for example, green for the indicator 8, red for the surface 10, and a lid with a window above a part of the surface 10 ( Figure 1 and Figure 2 not shown in the figures), a visible indication of the first and second states can be provided to the user viewing the SPD 100.

[0063] Figure 2 The third welding area 14 of the trip electrode 5 in the open state and the second welding area 13 of the trip assembly 4 in the second state are also shown. In Figure 1 , these welding areas overlap and are connected to each other by a low-temperature solder. In Figure 1 and Figure 2 , the first welding area, which is also connected to the second welding area 13 in the first state, is not visible.

[0064] In the first state, the second welding area 13 of the trip assembly 4 provides an electrical connection between the first welding area below and the third welding area 14 above the second welding area 13. When the trip assembly 4 moves to the second position in the second state as shown in Figure 2 , the insulating portion of the trip assembly electrically isolates the first welding area from the third welding area 14.

[0065] In addition, as shown in Figure 2 , the remote signal switch slider 6 is released, and the drive spring 7 has moved the switch slider 6 to trigger a remote signal.

[0066] Figure 3It is a schematic diagram showing the fault current path 57 of the bypass fuse component 56 provided between the first external electrode 71 and the second external electrode 72. Further description will be made with reference to Figure 5 the components and functions of the bypass fuse component 56.

[0067] Figure 4 It is a cross-sectional view of the insulation part 63 of the trip component 4, the trip electrode 5, the second lead frame 17 and the carrier 3 of the SPD 100. Figure 4 a shows the initial state (the first state) of the SPD 100, Figure 4 b shows the first arc 61 and the second arc 62 generated during the trip operation, Figure 4 c shows the second state of the SPD100. As Figure 4 shown in a, the insulation part 63 of the carrier 3 has an opening through which the first welding area of the second lead frame 17 can contact the second welding area of the trip component 4.

[0068] In Figure 4 the first state shown in a, the first welding area of the second lead frame 17 (see Figure 13 ), the second welding area of the trip component 4 and the third welding area of the trip electrode 5 are electrically and mechanically connected to each other by the low-temperature solder 60, which is configured to melt when a high current flows. When the low-temperature solder 60 melts, the mechanical connection is lost, and the trip component 4 is forced to move to the Figure 4 right in Figure 15 and 16 caused by the spring force of the tension spring or compression spring shown.

[0069] Figure 4 b shows an intermediate state during the linear movement of the trip component 4. Due to the high voltage between the third welding area and the second welding area and between the second lead frame 17 (especially the first welding area) and the second welding area, two arcs 61 and 62 are generated respectively.

[0070] In Figure 4 the intermediate state of b, the linear movement of the trip component 4 continues until it reaches the second position related to the Figure 4 second state shown in c. In this state, the second welding area is isolated from the first welding area by the insulation part 63 of the carrier 3, and no arc is generated anymore. Therefore, a safe condition where no current flows through the discharge unit can be achieved.

[0071] Figure 5A exploded view of the surge protection device 100 is shown. The SPD 100 includes a housing 1 that covers a carrier 3 and components mounted to the carrier 3. A transparent window 2 is provided at the front surface of the housing 1 to make the underlying indicator 8 or indicating surface 10 visible. The indicator 8 is provided with a spring 9 for actuating the movement between the first and second states. A status display window 12 is provided on the side surface of the housing 1.

[0072] A trip assembly 4 and two compression springs 15 are provided (see also Figure 15 ). The second electrode on the second main surface of the discharge unit 16 contacts a second lead frame 17 having a first welding area 18. The second lead frame 17 will be further described with reference to Figure 13 below.

[0073] On Figure 5 the left side, the trip electrode 5 is depicted as having a third welding area 14. For example, the trip electrode 5 can be made of a piece of metal sheet that is bent into a desired shape and has a notch at the third welding area 14. A second external terminal 72 is formed at the other end. In addition, the trip electrode 5 has a protruding portion that engages with an elastic member 55 for triggering a bypass fuse assembly including a first fuse 52 and a second fuse 54. A connecting member 53 is provided to make electrical contact between the first and second fuses 52, 54, see also Figure 3 .

[0074] The fixed electrode 19 connects the first external terminal ( Figure 5 not visible in Figure ) to the first lead frame. Only the clamp 22 of the first lead frame is visible in ​ . The clamp 22 is used to mount the first lead frame to the discharge unit 16, see

[0075] ​ SPD 100 is shown from the other side. The first lead frame 20 is in electrical contact with the first terminal on the first main surface of the discharge unit 16. The first lead frame 20 can be made of a piece of metal sheet that is cut and bent into a desired shape. The first lead frame has two clamps 21, 22 for holding the first lead frame 20 to the discharge unit 16. Hooks can be formed at the side surface of the discharge unit 16 to engage with the clamps 21, 22.

[0076] On the bottom surface of the SPD 100, an anti-misalignment latch 23 can be formed to prevent the SPD 100 from being inserted into the wrong external socket.

[0077] ​ Another view of the SPD 100 is shown. The carrier 3, the bypass fuse assembly 56 and the discharge unit 16 are separated in ​ .

[0078] ​ Shows a detailed exploded view of the bypass fuse assembly 56. It includes a fuse holding box 51 having a first chamber 51H1 for a second fuse 54 and a second chamber 51H2 for a first fuse 52. Both fuses 52, 54 have left contacts 52L, 54L and right contacts 52R, 54R. A connector 53 provides electrical contact between the left contact 52L of the first fuse 52 and the left contact 54L of the second fuse 54.

[0079] ​ Shows a detailed view of the carrier 3 of the SPD 100. On the top surface, the carrier 3 has a mounting groove 24 for the spring of the actuating indicator 8, see ​ And ​ . Two grooves 24 are provided to allow the use of a compression spring or a tension spring. A groove 26 is provided to limit the linear movement of the indicator 8.

[0080] On the side surface of the carrier 3, a hook 27 is provided to engage with the clamp 22 of the first lead frame 20.

[0081] A window or opening 28 in the main surface of the carrier 3 provides a passage between the first welding area of the second lead frame and the second welding area of the tripping assembly. Thus, the portion surrounding the opening 28 is an insulating portion 63, see also ​ .

[0082] A notch 29 is provided on the main surface of the carrier 3 to guide the linear movement of the tripping assembly, which has a corresponding groove 47, see ​ .

[0083] Slots 30 and 31 are provided to provide a predetermined position for the remote signal switch slider 6. A slot 32 is provided for mounting the tripping electrode 5. Another slot 58 is provided for mounting the elastic member 55, see ​ And ​ .

[0084] ​ Another view of the carrier 3 is shown from the other side. As ​ Shown, a slot 33 is provided for mounting the fixed electrode 19, which is connected to the first external terminal 71. In addition, the carrier 3 provides an inner cavity 36 for arranging the discharge module 16. Similar to the anti-misalignment latch 23 of ​ , the carrier 3 may include an anti-misalignment latch 35 which is provided as an opening for a corresponding notch in an external socket.

[0085] The reference numeral 34 is a hook 34 on the opposite side surface similar to the hook 27 for attaching the first lead frame clamp 21.

[0086] ​A view of the discharge unit 16 with the first lead frame 20 is shown. A welding area 40 is provided for connecting the first lead frame 20 to the fixed electrode 19. In addition, the first lead frame 20 has first and second clamps 21, 22 for the hooks 27 and 34 for mounting the discharge unit 16 to the carrier 3.

[0087] ​ A detailed view of the first lead frame 20 with the clamps 21, 22 is shown. Openings 41 and 42 are formed in the clamps 21, 22 respectively for engaging the clamps 21, 22 with the hooks 27, 34 of the carrier 3. The first lead frame 20 can be formed from a metal sheet cut and bent into the desired shape.

[0088] ​ A detailed view of the second lead frame 17 is shown. The second lead frame 17 can be formed from a metal sheet cut and bent into the desired shape. A variable cross-section channel 43 connects the outer frame of the second lead frame 17 to the first welding area 18. The cross-section of the channel 43 can be adapted to provide the desired resistance. In addition, it provides mechanical spring force to hold the first welding area 18 in its desired position.

[0089] ​ It is a detailed view of the trip assembly 4 which can be made of a PCB having the desired shape, thickness and stiffness. A second welding area 13 is formed at the part of the PCB having through holes to electrically connect the corresponding areas on the opposite sides of the PCB.

[0090] At the front of the PCB, a boss 44 is formed to engage with the indicator 8 and release it to slide to its second position. This occurs when the trip assembly 4 moves to the second position of the second state.

[0091] Edges 46, 48, 45 and 50 are provided to limit the linear movement of the trip assembly 4 between the first position of the first state and the second position of the second state. A slot 47 is provided to guide the linear movement by means of a notch 29 formed in the carrier 3. Another boss 49 is formed at the rear of the PCB to engage with the spring-loaded switch slider 6 for remote signal. In the first position, the boss 49 holds the spring-loaded switch slider 6 for remote signal in the first position. When the trip assembly 4 moves to the second position, the spring-loaded switch slider 6 for remote signal is released to slide to its second position.

[0092] ​ An embodiment of the carrier 3 of the SPD 100 according to the present utility model is shown, which has two compression springs 15 for causing the linear movement of the trip assembly 4, ​ An embodiment of the carrier 3 of the SPD 100 with two tension springs 15 for causing the linear movement of the trip assembly 4 is shown.

[0093] In ​ and 16 the shape of the trip assembly 4 is slightly different from that in the previous figures. For example, ​ the trip assembly 4 of

[0094] ​ does not have a slot for guiding linear movement. In addition, each carrier 3 has slightly different features, especially for guiding movement.

[0095] Although specific embodiments have been shown and described herein, those of ordinary skill in the art will understand that various alternatives and / or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present utility model as defined by the claims.

[0096] Specifically, the present utility model has been described with reference to specific protection circuit components and specific wiring within and / or between insertion parts, but the present utility model is not limited thereto, but can be used for any specific protection circuit components and specific wiring within or between insertion parts.

Claims

1. A surge protection device (100), characterized in that: The surge protection device comprises: A carrier (3) for providing a mechanical structure; a discharge cell (16) comprising a first terminal on a first major surface of the discharge cell (16) and a second terminal on a second major surface of the discharge cell (16); a first lead frame (20) having an electrode (37) contacting a first terminal of the discharge unit (16) and a clamp (21, 22) for mounting the discharge unit (16) to the carrier (3); a second lead frame (17) contacting a second terminal of the discharge unit (16) and including a first welding region (18); a trip electrode (5) comprising a third weld region (14); and A plate-shaped spring-loaded movable trip assembly (4) parallel to the second main surface of the discharge unit (16) and disposed between the trip electrode (5) and the second lead frame (17), and comprising a second welding area (13), wherein: In a first connection state, the first welding region (18), the second welding region (13), and the third welding region (14) are connected to each other by low-temperature solder (60); and In the second disconnected state, when the low-temperature solder (60) melts, the trip assembly (4) is displaced in a first direction parallel to the second main surface of the discharge unit (16), so that the insulating portion of the trip assembly (4) is disposed between the first welding area (18) and the third welding area (14).

2. The surge protection device (100) according to claim 1, characterized in that: The trip assembly (4) is spring-loaded using at least one compression spring or at least one tension spring arranged between a portion of the trip assembly (4) and the carrier (3).

3. The surge protection device (100) according to claim 1 or 2, further comprising: A spring-loaded movable indicator (8) is movably arranged on an end face of the carrier (3), wherein: In the first state, the indicator (8) is latched to the carrier (3) in a first position; and In the second state, when the latch is released by interaction between the tip portion (44) of the trip assembly (4) and the indicator (8), the indicator (8) is displaced to a second position in a second direction perpendicular to the first direction by a spring force.

4. The surge protection device (100) according to claim 1 or 2, characterized in that: The trip assembly (4) comprises: a guide groove (47) for guiding the linear movement of the trip assembly (4) in a first direction; and A first limiting surface (45) and a second limiting surface (50) for limiting linear movement of a trip assembly (4) in a first direction between a first position and a second position.

5. The surge protection device (100) according to claim 1 or 2, characterized in that: The discharge unit (16) includes a varistor electrically connected between a first lead frame (20) and a second lead frame (17).

6. The surge protection device (100) according to claim 1 or 2, characterized in that: The carrier (3) includes a plate-shaped insulating portion (63) that provides a sliding surface for the trip assembly (4); and The isolation portion (63) includes an opening (28) through which the first welding region (18) contacts the second welding region (13) in the first state.

7. The surge protection device (100) according to claim 1 or 2, characterized in that: The surge protection device further comprises: A first external terminal (71) connected to the first lead frame (20); and A second external terminal (72) is connected to the trip electrode (5).

8. The surge protection device (100) according to claim 1 or 2, characterized in that: The surge protection device further comprises a housing (1) covering the discharge unit (16) and the trip assembly (4).

9. The surge protection device (100) according to claim 7, characterized in that: The surge protection device further comprises: a bypass fuse assembly (56) having a fuse box (51) housing a first fuse (52) and a second fuse (54) connected in series; and A spring-loaded switch slide (6) wherein: In the first state, the switch slide (6) is held by the clamping boss (49) of the trip assembly (4) against the spring force; and In the second state, the switch slide (6) is not held by the clamping boss (49) and is displaced by the spring force so that the elastic electrode (55) contacts the trip electrode (5), thereby providing a fault current path (57) from the first external terminal (71) through the first fuse (52) and the second fuse (54) to the second external terminal (72).

10. The surge protection device (100) according to claim 9, characterized in that: In the first state, the insulating portion of the trip assembly (4) is disposed between the elastic electrode (55) and the trip electrode (5).

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