CN216412989U - SPD thermal trip display mechanism - Google Patents
SPD thermal trip display mechanism Download PDFInfo
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- CN216412989U CN216412989U CN202123395983.8U CN202123395983U CN216412989U CN 216412989 U CN216412989 U CN 216412989U CN 202123395983 U CN202123395983 U CN 202123395983U CN 216412989 U CN216412989 U CN 216412989U
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Abstract
The utility model belongs to the technical field of lightning protection equipment, and discloses an SPD thermal trip display mechanism which is used for feeding back a thermal trip state in an SPD module with a plurality of piezoresistors, and comprises push rods connected to the connecting end of each piezoresistor through a hot-melt conductive structure, and state indicating sheets matched with all the push rods; the push rod has a movement trend for pushing the state indicating sheet to achieve an indicating effect. The utility model can change the state when any piezoresistor is abnormally heated and tripped by the arranged integral state indicating sheet, thereby timely feeding back the on-off condition of the circuit in the whole SPD module and ensuring the use safety of the SPD module to the maximum extent.
Description
Technical Field
The utility model belongs to the technical field of lightning protection electrical equipment, and particularly relates to an SPD thermal trip display mechanism.
Background
SPD is an indispensable device in electronic equipment lightning protection, and functions to limit transient overvoltage entering a power line and a signal transmission line within a voltage range that the equipment or system can bear, or to discharge lightning current to the ground, thereby protecting the protected equipment or system from impact. And SPD has multiple structure and the form of setting, but the core component among most surge protector all has the condition of deterioration inefficacy, and when appearing damaging or deterioration inefficacy, the SPD structure that originally belongs to the broken circuit forms the short circuit, and electric current continuously leaks from SPD, leads to wherein core component temperature constantly to rise to produce fire hazard potential safety hazard.
In order to effectively avoid the above situations in time, the existing SPD equipment is provided with a thermal tripping mechanism which is used for breaking off in time to form an open circuit when the leakage current is generated to a certain temperature, thereby avoiding fire. The essence of thermal tripping is the tripping of an over-temperature protection action, and the over-temperature protection is the overload protection with the characteristics of time delay tripping and time delay return, and is an overload tripper which acts according to the thermal effect of current flowing through the tripper. This mechanism is generally operated to directly open the circuit, and does not affect other internal functional components. The existing SPD modules are all of independent structures, a plurality of SPD modules are arranged in a row-inserting mode, and are provided with independent thermal tripping structures and feedback structures, and the integrated SPD module with a plurality of piezoresistors does not have a module for feeding back the on-off of the thermal tripping structures of all the piezoresistors.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides an SPD thermal trip display mechanism which is arranged in an SPD module with a plurality of piezoresistors, can realize thermal melting connection with each piezoresistor, stores trip potential energy, and quickly disconnects and indicates the trip potential energy to the outside when abnormal heating occurs.
The technical scheme adopted by the utility model is as follows:
the utility model discloses an SPD thermal trip display mechanism which is used for feeding back a thermal trip state in an SPD module with a plurality of piezoresistors, and comprises push rods connected to the connecting end of each piezoresistor through a hot melting conductive structure and state indicating sheets matched with all the push rods;
the push rod has a movement trend for pushing the state indicating sheet to achieve an indicating effect.
It is worth to be noted that the SPD module is an integrated surge protection device in which a plurality of piezoresistors are arranged in the same housing. The whole SPD module is connected in series in a single bleeder circuit, the piezoresistors in the SPD module are arranged in parallel, after a single piezoresistor fails, other piezoresistors can achieve the same effect, and piezoresistors of different types can be adopted according to requirements, so that the effect of multi-path failure protection is achieved.
However, if only one of the piezoresistors fails, the hidden trouble which cannot be eliminated in the circuit can exist, and even if other piezoresistors keep the state, the larger problem can also occur. The push rod in this embodiment has a portion connected to the incoming/outgoing circuit of the single piezo-resistor by a thermally fused conductive structure for on/off feedback. The hot-melt conductive structure includes various types, but is generally a low-temperature soldering structure.
The connection mode includes various modes, namely the push rod is provided with a conductive part and only needs to be connected with any terminal of the piezoresistor through low-temperature soldering. Or the push rod does not have a conductive part per se, but has a bearing end face, and the hot-melt conductive structure is arranged on the bearing end face and is directly connected with the terminal of the piezoresistor.
However, in any of the above structures, when the corresponding varistor generates heat abnormally, the portion melts and loses the connection restriction effect. The push rod has a movement trend, and once the limit force is lost, the push rod can act in time and simultaneously push the state indicating sheet to act so as to change the state of the push rod due to the fact that the hot melting conductive structure is limited and cannot act. And the SPD module is provided with a region which can display the corresponding state indicating sheet, and once the position or the state of the state indicating sheet is changed, the on-off condition of the internal circuit of the SPD module can be easily checked from the outside.
Because the state indicating sheet is matched with all push rods, namely all push rods can push the state indicating sheet to act when acting, the single piezoresistor can feed back outwards after failing, a worker can reach the site in time and replace the single or a plurality of piezoresistors in the SPD module, and the SPD module can be continuously used after resetting the thermal tripping structure.
It should be noted that the pushing is used to refer to the linkage relationship between the pushing rod and the state indicating sheet, and those skilled in the art should understand that various direct or indirect force transmission modes are equivalent alternatives. Simultaneously, the state indication piece is not complete lamellar structure yet, have the state and indicate the function and can with all push rods cooperations can, occupy in order to reduce the space and then can adopt lamellar structure as far as possible to have the contact surface of broad and a plurality of push rod cooperations, still have thin characteristics simultaneously and do not occupy too much space.
With reference to the first aspect, the present invention discloses a first implementation manner of the first aspect, wherein a push head is arranged at an end of one end of the push rod, and the push head is matched with the state indicating sheet and abuts against the state indicating sheet and pushes the state indicating sheet to enter an indicating position when the connection end of the push rod and the piezoresistor is disconnected.
In combination with the first aspect or the first embodiment of the first aspect, the present invention discloses a second embodiment of the first aspect, wherein the push rod is an elastic member having a portion that is elastically compressed when being connected and fixed to the connection end of the varistor.
With reference to the first aspect or the first implementation manner of the first aspect, the present invention discloses a third implementation manner of the first aspect, wherein the push rod has a force bearing end, the force bearing end contacts with an externally provided spring, and the spring is in a compressed or stretched state when the push rod is fixedly connected with the connecting end of the piezoresistor.
With reference to the third embodiment of the first aspect, the present invention discloses a fourth embodiment of the first aspect, wherein the middle portion of the push rod has a thermal melting connection point, and the thermal melting connection point is connected in series to the incoming/outgoing circuit of the corresponding piezoresistor.
With reference to the first implementation manner of the first aspect, the utility model discloses a fifth implementation manner of the first aspect, an included angle between the motion trend direction of the push rod and the action direction of the state indicator sheet is not equal to zero, a soft part is arranged at the push head of the push rod, and the soft part is limited by the SPD module to be bent and driven.
With reference to the first aspect or the first implementation manner of the first aspect, the present disclosure discloses a sixth implementation manner of the first aspect, where the SPD module has a cavity with a window, and a structure for limiting the status indicator sheet from sliding linearly is further disposed in the cavity;
the state indicating sheet pushed by the push rod appears in the window to realize indication.
With reference to the first aspect or the first implementation manner of the first aspect, the present disclosure discloses a seventh implementation manner of the first aspect, wherein the piezoresistors are arranged in the SPD module side by side, and the push rods are all arranged on the same side;
the state indicating sheet is provided with a plurality of pushing grooves corresponding to the push rods, and the end parts of the push rods are inserted into the pushing grooves.
With reference to the seventh implementation manner of the first aspect, the present disclosure discloses an eighth implementation manner of the first aspect, and the status indication sheet further has an indication end face, and the indication end face has a striking mark.
With reference to the first aspect or the first implementation manner of the first aspect, the present invention discloses a ninth implementation manner of the first aspect, wherein the push rod further has an operation end connected to a remote signaling terminal disposed in the SPD module, and when the push rod is operated, the operation end causes a state change of the remote signaling terminal to warn.
The utility model has the beneficial effects that:
(1) according to the utility model, through the arranged integral state indicating sheet, the state change can be carried out when any piezoresistor is abnormally heated and tripped, so that the on-off condition of a circuit in the whole SPD module is fed back in time, and the use safety of the SPD module is ensured to the maximum extent;
(2) the utility model can arrange a spring and a push rod with a certain length in a narrow space by arranging the soft part, and utilizes two adjacent side edges of the piezoresistor, thereby having more compact internal structure design, and simultaneously adopting the spring with standard length to provide stronger tripping thrust to ensure that the spring pushes the SPD to pop outwards in time after the hot melting conductive structure fails, thereby feeding back the internal circuit state of the SPD in time.
Drawings
Fig. 1 is a first axial side view of an SPD module to which the thermal trip display mechanism of the present invention is applied;
fig. 2 is a second axial side view of an SPD module to which the thermal trip display mechanism of the present invention is applied;
fig. 3 is an isometric view of an SPD module with a housing half-sectioned for use with the thermal trip display mechanism of the present invention;
fig. 4 is a top view of an SPD module applied to the thermal trip display mechanism of the present invention with the housing half-cut;
fig. 5 is a schematic view of the internal structure of the thermal trip indicating mechanism of the present invention with parts removed;
fig. 6 is an isometric view of the internal structure of the thermal trip display mechanism of the present invention with portions removed after installation;
FIG. 7 is a schematic diagram of the thermal trip display mechanism of the present invention in a state after thermal trip in the SPD;
FIG. 8 is a top schematic view of the thermal trip display mechanism of the present invention after a thermal trip in the SPD;
fig. 9 is a schematic view of the thermal trip indicating mechanism of the present invention in a state connected to a varistor;
fig. 10 is an isometric view of the thermal trip indicating mechanism of the present invention in connection with a varistor.
In the figure: 1-shell, 2-wiring port, 3-window, 5-bracket layer, 6-state indicating sheet, 7-push rod, 8-wiring terminal, 9-spring, 10-fastener, 10.1-fixture block, 11-piezoresistor, 12-circuit board, 13-remote signaling terminal, 14-conductive insertion sheet, 15-top plate, 16-first connecting end, 17-remote signaling pressing sheet, 18-second connecting end and T-conductive block.
Detailed Description
The utility model is further explained below with reference to the drawings and the specific embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example 1:
the embodiment discloses an SPD thermal trip display mechanism, which is applied to an SPD module having a plurality of piezoresistors 11, as shown in fig. 1 to 10.
First, the SPD module protects an external leakage circuit by providing a plurality of piezoresistors 11 arranged in parallel in the housing 1. The external structure of the SPD module is shown in fig. 1 and 2, having a separate housing 1, with a connection port 2 provided outside the housing 1 for connecting external cables.
The bottom of the housing 1 of the SPD module has an opening from which the internal module is inserted and secured by a base 4. The side surface of the shell 1 is provided with a plurality of access ends and an access end, and the access ends and the access end are provided with wiring terminals 8 which are pressed and fixed by bolts.
Fig. 3 shows a schematic internal structure of the SPD module with the housing 1 being half-cut, and it can be seen that a plurality of support layers 5 are fixed on the base 4, and each support layer 5 has a varistor 11 therein. This support layer 5 is an independent functional area promptly, and the lateral wall sets up for the fretwork, and the inner structure can be looked over to the outside.
The two ends of the bracket layer 5 are provided with connecting terminals 8, a parallel branch formed by an air release pipe or a lightning protection component is used in the bracket layer 5 at the outermost side in the figure 3, and the connecting end of the whole SPD module is arranged at the connecting terminal 8 of the bracket layer 5.
Furthermore, three additional support layers 5 arranged side by side are arranged in the whole SPD module, a piezoresistor 11 is arranged in each support layer 5, and the piezoresistors 11 form a branch circuit.
The tops of all the support layers 5 are covered by the same top plate 15, and the top plate 15 is provided with a sliding groove through which the state indicating sheet 6 is matched.
Here, the status indicator sheet 6 is a sheet structure having at least three outgoing ends in three channels of the chute, but not limited thereto.
The status indication sheet 6 has a panel on the other side, which is marked with a distinct logo, or painted with a bright color such as red, or covered with a clear pattern, so as to be displayed at the window 3 provided on the housing 1.
Here, the slide groove has a stop strip, and when the three outgoing end portions of the status indicator sheet 6 are inserted into the corresponding channels, the three outgoing end portions are continuously slid inward so as to abut against the stop strip, which is the initial status of the status indicator sheet 6.
The push rods 7, which are arranged in each carrier layer 5 with the varistor 11, have a projecting end which projects from the upper end of the sliding track on the carrier layer 5 side and is bent into the guide plate 15, aligned with the corresponding passage of the slide groove of the plate 15.
In this embodiment, the push rod 7 is an integrated structure, but not limited thereto, and the implementation manner of a multi-section structure or a linked multi-section structure is also included. The push rod 7 has two ends, wherein the end located inside the carrier layer 5 is connected to an internally provided spring 9, which is always urged in the upward direction in the figure by the spring 9.
And the other end part is a push head which is inserted into a channel of the sliding groove of the top plate 15 in a sliding way, the push rod 7 is pushed by the spring 9, and the push head pushes the state indicating sheet 6 on the top plate 15 to act.
Because the direction of the sliding groove is vertical to the stress direction of the push rod 7, a bendable bending part is arranged between the push rod 7 and the push head. The figure shows that the bending part is a push rod 7 part with a through groove at the center, the thickness of the push rod is reduced, and the middle part is hollow, so that the push rod has better bending performance compared with other parts of the push rod 7.
Meanwhile, the sliding rails of the support layer 5 and the sliding grooves of the top plate 15 are respectively provided with a limiting structure, the limiting structures are limited during installation, when the pushing head is pushed in the sliding rails from bottom to top, the pushing head automatically turns to the inside of the sliding groove channel of the top plate 15, and when the spring 9 pushes the pushing head to continue to act, the deformation of the bending part of the pushing head is limited by the limiting structures.
It should be noted that, by selecting the material type, the material of the push rod 7 itself does not have the amount of compression deformation in the length direction, and although the bending part can be bent to both sides, when the bending part is limited, the push rod can directly transmit the pushing force to the push head after receiving the pushing force in the length direction.
Furthermore, the middle part of the push rod 7 is provided with a conductive block T, and the conductive block T can be made of metal or nonmetal materials and is fixed on the push rod 7 by embedding or bonding.
In the carrier layer 5, the varistor 11 has a first connection 16 and a second connection 18. Wherein the second connecting end 18 is adjacent to the terminal 8 of the corresponding carrier layer 5 and the push rod 7 is between the two structures. In the initial state, the gap between the two sides of the push rod 7 is small, so that the conductive block T is just positioned between the second connecting end 18 and the metal part of the connecting terminal 8. And the three structures are connected and fixed by using a low-temperature soldering process so as to form a passage.
And the second connecting terminal 18 passes through the support layer 5 and is connected with the conductive insert 14 arranged on the upper part of the base 4. As shown in fig. 6, 9 and 10, the conductive insert 14 can be seen to have a plurality of sockets, and the second connection end 18 of each varistor 11 is inserted into the corresponding socket to achieve electrical connection and is uniformly connected out through the connection terminal 8 arranged in the outermost support layer 5.
It can be stated that, in the initial position, as shown in fig. 7, both the varistor 11 and the connection terminal 8 are fixed in the respective carrier layer 5. Two black frame parts in fig. 7 are low-temperature soldering connection parts of the conductive block T of the push rod 7 and the metal conductors on two sides, the push rod 7 is fixed due to the low-temperature soldering structure, the spring 9 is in a compressed state at this time, and the plate surface with an obvious mark cannot be seen in the window 3 of the shell 1, which indicates that the SPD module is in a normal working state at this time.
Once the piezoresistor 11 is degraded or failed in the process of leakage, a power frequency current continuously flows into a certain access end, and the piezoresistor 11 in the corresponding support layer 5 continuously generates heat, so that a hot-melting conductive structure (namely, a low-temperature soldering structure) on the push rod 7 at the corresponding position is melted. At this time, the compressed spring 9 can immediately push the push rod 7 to move upwards, and the push head with the upper part in the horizontal state pushes the state indicating sheet 6 to act, so that a clear mark appears in the window 3, and a worker can judge that the failed piezoresistor 11 exists in the SPD module according to the mark.
Further, the present embodiment provides another feedback mechanism. A circuit board 12 is provided on the base 4, the circuit board 12 extending horizontally on the bottom surface by a length sufficient to cover the lower portion of each of the rack layers 5. And a remote signaling switch is arranged on the circuit board 12 corresponding to each bracket layer 5, the top of the remote signaling switch is provided with a movable end part, and a remote signaling pressing sheet 17 is arranged on the movable end part.
A convex actuating end is also provided at the lower part of the push rod 7, and one end of the remote signaling pressing sheet 17 extends into the bracket layer 5 and abuts against the actuating end. As shown in fig. 7, the remote signaling pad 17 is abutted against the remote signaling switch at one end and has a through slot in the middle for the movable end of the remote signaling switch to pass through and an enlarged end stop at the end where it passes through.
The end of the remote signaling pressing sheet 17 is abutted against the action end, and is limited by the action end to keep the inclined state all the time. Once the push rod 7 acts, the action end can drive the remote signaling pressing sheet 17 upwards to rotate by the abutting end of the remote signaling switch, so that the movable end of the remote signaling switch is driven to move outwards, and the signal of an internal circuit is changed to achieve the feedback effect.
The circuit board 12 can collect relevant current changes in real time, the circuit board is communicated with an external circuit through a remote signaling terminal 13 arranged on the outermost side, a rear-end monitoring system can receive signals in real time through circuit feedback to warn, and maintenance personnel can judge which SPD module fails and replace the SPD module according to the state indicating sheet 6 after the circuit board reaches the site.
Further, in the present embodiment, for convenience of installation, an opening is formed at a lower portion of each of the rack layers 5, and the opening corresponds to the sliding track of the push rod 7.
A cylindrical fastener 10 is fittingly mounted at the opening, as shown in fig. 5 and 6, which show the internal structure with the base 4 and the housing 1 removed, and it can be seen that the fastener 10 has an upwardly extending stem on the upper part, which is sleeved with a spring 9.
On the top of the fastening element 10 is the bottom end of the push rod 7, and the bottom end of the push rod 7 has a stop surface against which the spring 9 can abut when the spring 9 contacts. The fastener 10 continues to be pushed upwards, compressing the spring 9 to a certain length.
The opening edge of the bracket layer 5 is provided with a notch, and the outer side of the fastener 10 is provided with a convex fixture block 10.1, when the fixture block 10.1 is installed, the fixture block 10.1 is aligned with the notch, and the fastener 10 can be completely pushed into the bracket layer 5.
After the spring 9 is pushed in, the fastener 10 is rotated, so that the fixture block 10.1 rotates to other positions and is limited by the inner wall of the opening of the bracket layer 5, the fastener 10 cannot fall out of the bracket layer 5, and the spring 9 is fixed, compressed and kept stable.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the utility model, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (10)
1. The utility model provides a SPD thermal trip display mechanism for set up feedback thermal trip state in the SPD module that has a plurality of piezo-resistors, its characterized in that: the device comprises push rods (7) connected to the connecting end of each piezoresistor (11) through a hot-melt conductive structure, and a state indicating sheet (6) matched with all the push rods (7);
the push rod (7) has a movement trend for pushing the state indicating sheet (6) to achieve an indicating effect.
2. The SPD thermal trip display mechanism according to claim 1, wherein: the push rod (7) is provided with a push head at one end, the push head is matched with the state indicating sheet (6) and abuts against the state indicating sheet (6) when the connecting end of the push rod (7) and the piezoresistor (11) is disconnected, and the push rod is pushed to enter an indicating position.
3. An SPD thermal trip display mechanism according to claim 1 or 2, characterized in that: the push rod (7) is an elastic piece and is provided with a part which is elastically compressed when being connected and fixed with the connecting end of the piezoresistor (11).
4. An SPD thermal trip display mechanism according to claim 1 or 2, characterized in that: the push rod (7) is provided with a stress end, the stress end is in contact with a spring (9) arranged outside, and the spring (9) is in a compressed or stretched state when the stress end is fixedly connected with the connecting end of the piezoresistor (11).
5. The SPD thermal trip display mechanism according to claim 4, wherein: the middle part of the push rod (7) is provided with a hot melting connection point (T) which is connected in series with the corresponding connecting-in/connecting-out circuit of the piezoresistor (11).
6. The SPD thermal trip display mechanism according to claim 2, wherein: the motion trend direction of the push rod (7) and the action direction of the state indicating sheet (6) form an included angle which is not equal to zero, a soft part is arranged at the push head of the push rod (7), and the soft part is limited by the SPD module to be bent and driven.
7. An SPD thermal trip display mechanism according to claim 1 or 2, characterized in that: the SPD module is provided with a cavity with a window (3), and a structure for limiting the state indicating sheet (6) to linearly slide is also arranged in the cavity;
the state indicating sheet (6) is pushed by the push rod (7) to appear in the window (3) for realizing indication.
8. An SPD thermal trip display mechanism according to claim 1 or 2, characterized in that: the piezoresistors (11) are arranged in the SPD module side by side, and the push rods (7) are arranged on the same side;
the state indicating sheet (6) is provided with a plurality of pushing grooves corresponding to the push rods (7), and the end parts of the push rods (7) are inserted into the pushing grooves.
9. The SPD thermal trip display mechanism according to claim 8, wherein: the state indicating sheet (6) is also provided with an indicating end face, and the indicating end face is provided with a striking mark.
10. An SPD thermal trip display mechanism according to claim 1 or 2, characterized in that: the push rod (7) is also provided with an action end connected with a remote signaling terminal (13) arranged in the SPD module, and when the push rod (7) acts, the action end causes the state change of the remote signaling terminal (13) to warn.
Priority Applications (1)
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CN202123395983.8U CN216412989U (en) | 2021-12-30 | 2021-12-30 | SPD thermal trip display mechanism |
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CN202123395983.8U CN216412989U (en) | 2021-12-30 | 2021-12-30 | SPD thermal trip display mechanism |
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