CN219643656U - Power-loss protection alarm device for PLC cabinet power supply - Google Patents
Power-loss protection alarm device for PLC cabinet power supply Download PDFInfo
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- CN219643656U CN219643656U CN202321280142.9U CN202321280142U CN219643656U CN 219643656 U CN219643656 U CN 219643656U CN 202321280142 U CN202321280142 U CN 202321280142U CN 219643656 U CN219643656 U CN 219643656U
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- 239000003245 coal Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a power failure protection alarm device for a PLC cabinet power supply, which comprises a PLC power supply, a 1AC cabinet system, a 2AC cabinet system and a 3AC cabinet system; the PLC power supply is connected with the 1AC cabinet system and the 2AC cabinet system respectively after passing through the 3AC cabinet system; a first audible and visual alarm device is arranged in the 1AC cabinet system, the 1AC cabinet system fails, and the first audible and visual alarm device acts; and a second audible and visual alarm device is arranged in the 2AC cabinet system, the 2AC cabinet system fails, and the second audible and visual alarm device acts. The PLC power supply is powered by the 1AC cabinet system and the 2AC cabinet system respectively after passing through the 3AC cabinet system, and is provided with the first audible and visual alarm device and the second audible and visual alarm device respectively to determine the faults of the 1AC cabinet system and the 2AC cabinet system and remind workers, so that the workers can receive the fault information at the first time and solve the problems in time, thereby effectively avoiding the shutdown of the exhaust fan caused by various accidents and better ensuring the safe and stable operation of a mine.
Description
Technical Field
The utility model relates to the technical field of electrical protection, in particular to a power failure protection alarm device for a PLC cabinet.
Background
The mine ventilator is used as main technical equipment for safe production of coal mines, is an important component of a mine ventilation system, and is a foundation for safe production of the coal mines. The requirements of the coal mine safety regulations are as follows: when the operation fan fails, a standby fan must be started within 10 minutes to ensure life safety of underground miners.
For high gas, high ground pressure and high temperature mines. The mine adopts a central parallel extraction type ventilation mode. The axial-flow fan is installed in the ventilation machine room, one working and one standby, the air quantity of the mine is regulated by adopting a movable vane adjustable mode, and the AMI630L6WBAH asynchronous motor produced by ABB is provided, the rated rotation speed of the motor is 992r/min, the power is 3900Kw and the rated current is 263A. At present, the angle of the fan blade is 38 degrees, and the air extraction quantity is 326m 3 And/s, inlet negative pressure-2.45 Kpa, and fan negative pressure-3.64 Kpa.
The high-voltage power supply of the ventilation machine room adopts double bus sectional control, an I-path inlet wire (1021 #) is provided with an exhaust fan No. 1, and meanwhile, an I-section low voltage is provided through a dry type transformer. The II section inlet wire (1020#) is provided with a No. 2 exhaust fan, and meanwhile, the II section low voltage is provided with a dry type transformer. The two low-pressure circuits are communicated through the bus. The PLC centralized control power supply consists of 2 sets of 6KVA uninterruptible power supplies and batteries thereof. The loads carried in the 1AC cabinet system are the control loop power supply of No. 1 ventilator auxiliary equipment (hydraulic station, lubrication station, cooling water pump, vane actuator, sealing fan, shutter air door, etc.). When the power supply of the 1AC cabinet system is powered off, the lubrication station, the hydraulic station, the cooling water pump, the blade actuator and the like of the 1# ventilator stop running due to the power failure of the control part, and if the power supply is not restored for a long time, the conditions of overtemperature of a fan motor, incapability of keeping the angle of the fan blade and the like are caused, so that the ventilator is stopped or the ventilation quantity of the ventilator is greatly reduced, the underground air supply is influenced, and the life safety of miners is threatened. Similarly, when the power supply of the 2AC cabinet system is powered off, the lubrication station, the hydraulic station, the cooling water pump, the blade actuator and the like of the No. 2 ventilator can stop running due to the power failure of the control part, so that the ventilator is stopped or the ventilation quantity of the ventilator is greatly reduced. The process needs to be judged in time by workers, and when the operators do not find faults in time, reliable operation of the ventilator cannot be guaranteed, so that mine production safety cannot be guaranteed.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the power failure protection alarm device for the PLC cabinet is provided, and safe and reliable operation of the device is ensured.
In order to solve the technical problems, the utility model provides the following technical scheme:
a power failure protection alarm device of a PLC cabinet power supply comprises the PLC power supply, a 1AC cabinet system, a 2AC cabinet system and a 3AC cabinet system;
the PLC power supply is connected with the 1AC cabinet system and the 2AC cabinet system respectively after passing through the 3AC cabinet system;
a first audible and visual alarm device is arranged in the 1AC cabinet system, the 1AC cabinet system fails, and the first audible and visual alarm device acts;
and a second audible and visual alarm device is arranged in the 2AC cabinet system, the 2AC cabinet system fails, and the second audible and visual alarm device acts.
The advantages are that: the PLC power supply is powered by the 1AC cabinet system and the 2AC cabinet system respectively after passing through the 3AC cabinet system, and is provided with the first audible and visual alarm device and the second audible and visual alarm device respectively to determine the faults of the 1AC cabinet system and the 2AC cabinet system and remind workers, so that the workers can receive the fault information at the first time and solve the problems in time, thereby effectively avoiding the shutdown of the exhaust fan caused by various accidents and better ensuring the safe and stable operation of a mine.
Preferably, the 1AC cabinet system comprises a first power supply line, a total air switch 1QF, an air switch 1QF2 and a first audible and visual alarm device, wherein the first audible and visual alarm device comprises a first alarm lamp and a first bell;
the first power supply line is connected with a 3AC cabinet system; the main air switch 1QF and the air switch 1QF2 are connected in series with a first power supply line of the 1AC cabinet system;
the first alarm lamp is connected with the first bell in parallel and then connected with the power supply end of the first power supply line, and the first alarm lamp and the first bell are both connected with a normally closed relay contact KA1 in series.
Preferably, the first audible and visual alarm is mounted within a 3AC cabinet system.
Preferably, the 2AC cabinet system comprises a second power supply line, a total air switch 2QF, an air switch 2QF2 and a second audible alarm device, wherein the second audible alarm device comprises a second alarm lamp and a second bell;
the second power supply line is connected with a 3AC cabinet system; the main air switch 2QF and the air switch 2QF2 are connected in series with a second power supply line of the 2AC cabinet system;
the second alarm lamp is connected with the second bell in parallel and then connected with the power supply end of the second power supply line, and the second alarm lamp and the second bell are both connected with a normally closed relay contact KA2 in series.
Preferably, the second audible alarm is installed in a 3AC cabinet system.
Preferably, the 3AC cabinet system comprises an automatic switching circuit, wherein the automatic switching circuit comprises a fuse FU, an air switch 1QF1, an air switch 11QF, an air switch 1QF2, a first reset switch, a first power-off indicator lamp, a second reset switch and a second power-off indicator lamp;
the PLC power supply is connected with the 1AC cabinet system after sequentially passing through the fuse FU, the air switch 1QF1 and the air switch 1QF 2; the PLC power supply is connected with the 2AC cabinet system after passing through the fuse FU, the air switch 1QF2 and the air switch 2QF2 in sequence;
the normally closed relay contact KA2 is connected in series with the first reset switch and the relay KA2 and then is connected between the fuse FU and the air switch 1QF 2; the normally closed relay contact KA1 is connected with the relay KA1 in series and then connected with both sides of the normally closed relay contact KA2 and the relay KA2 in parallel; the second power-loss indicator lamps are connected in parallel to two sides of the relay KA 2;
the normally closed relay contact KA1 is connected in series with the second reset switch and the relay KA1 and then is connected between the fuse FU and the air switch 2QF 2; the normally closed relay contact KA2 is connected with the relay KA2 in series and then connected with both sides of the normally closed relay contact KA1 and the relay KA1 in parallel; the first power failure indicator lamp is connected in parallel to two sides of the relay KA1.
Preferably, the PLC power supply includes a first battery box, a first UPS (uninterruptible power supply), a second battery box, and a second UPS;
the first battery box is connected with the first UPS, and the second battery box is connected with the second UPS;
one end of the first UPS is connected with the 1 section of low voltage, the other end of the first UPS is connected with one end of the second UPS after passing through the air switch 1QF1, the air switch 11QF and the air switch 2QF1 in sequence, and the other end of the second UPS is connected with the 2 sections of low voltage;
the 1AC cabinet system is connected between the air switch 1QF1 and the air switch 11QF through the air switch 1QF2, and the 2AC cabinet system is connected between the air switch 2QF1 and the air switch 11QF through the air switch 2QF 2.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The PLC power supply is powered by the 1AC cabinet system and the 2AC cabinet system respectively after passing through the 3AC cabinet system, and is provided with the first audible and visual alarm device and the second audible and visual alarm device respectively to determine the faults of the 1AC cabinet system and the 2AC cabinet system and remind workers, so that the workers can receive the fault information at the first time and solve the problems in time, thereby effectively avoiding the shutdown of the exhaust fan caused by various accidents and better ensuring the safe and stable operation of a mine.
(2) According to the utility model, the automatic switching circuit is arranged by modifying the 3AC cabinet system, when one uninterruptible power supply loses power due to faults, the other uninterruptible power supply can be quickly closed, so that the power supply of the 1AC cabinet system and the 2AC cabinet system can be ensured, and the operation is not required to be interrupted.
(3) The utility model has higher reliability and economy, and the device is safe and reliable, and has simple structure, convenient installation and use and no maintenance. Meanwhile, the cost is high because the number of required components is small and a large amount of cost is not needed.
Drawings
FIG. 1 is a schematic diagram of the circuit connections of the 1AC cabinet system of the present utility model;
FIG. 2 is a schematic diagram of the circuit connections of the 1AC cabinet system of the present utility model;
FIG. 3 is a schematic diagram of an automatic switching circuit connection of the 3AC cabinet system of the present utility model;
FIG. 4 is a schematic diagram of the power supply of the PLC power supply of the present utility model;
in the figure: 1. 1AC cabinet system; 10. a first audible and visual alarm device; 11. a first bell; 12. a first warning lamp; 2. a 2AC cabinet system; 20. a second audible and visual alarm device; 21. a second bell; 22. a second alarm lamp; 3. a 3AC cabinet system; 31. a first reset switch; 32. the first power-off indicator lamp; 33. a second reset switch; 34. the second power-off indicator lamp; 4. a PLC power supply; 41. a first battery box; 42. a first UPS; 43. a second battery box; 44. and a second UPS.
Detailed Description
In order to facilitate the understanding of the technical scheme of the present utility model by those skilled in the art, the technical scheme of the present utility model will be further described with reference to the accompanying drawings.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 to 4, the embodiment discloses a power failure protection alarm device for a PLC cabinet, which comprises a 1AC cabinet system 1, a 2AC cabinet system 2, a 3AC cabinet system 3 and a PLC power supply 4; the PLC power supply 4 is connected with the 1AC cabinet system 1 and the 2AC cabinet system 2 respectively after passing through the 3AC cabinet system 3; a first audible and visual alarm device 10,1AC is arranged in the 1AC cabinet system 1, the cabinet system 1 fails, and the first audible and visual alarm device 10 acts; the second audible alarm 20,2AC is arranged in the 2AC cabinet system 2, the cabinet system 2 fails, and the second audible alarm 20 acts. The PLC power supply 4 of the embodiment supplies power to the 1AC cabinet system 1 and the 2AC cabinet system 2 respectively after passing through the 3AC cabinet system 3, and is provided with the first audible and visual alarm device 10 and the second audible and visual alarm device 20 respectively to determine the faults of the 1AC cabinet system 1 and the 2AC cabinet system 2 and remind workers, so that the workers can receive the fault information at the first time and solve the problems in time, thereby effectively avoiding the shutdown of an exhaust fan caused by various accidents and ensuring the safe and stable operation of a mine well.
Referring to fig. 1, in the present embodiment, a 1AC cabinet system 1 includes a first power supply line, a total air switch 1QF, an air switch 1QF2, and a first audible and visual alarm device 10, and the first audible and visual alarm device 10 includes a first alarm lamp 12 and a first bell 11; the first power supply line is connected with the 3AC cabinet system 3; the main air switch 1QF and the air switch 1QF2 are connected in series with a first power supply line of the 1AC cabinet system 1; the first alarm lamp 12 is connected in parallel with the first bell 11 and then connected to the power supply end of the first power supply line, and the first alarm lamp 12 and the first bell 11 are both connected in series with a normally closed relay contact KA1.
Referring to fig. 2, similarly, the 2AC cabinet system 2 includes a second power supply line, a total air switch 2QF, an air switch 2QF2, and a second audible alarm device 20, and the second audible alarm device 20 includes a second alarm lamp 22 and a second bell 21; the second power supply line is connected with the 3AC cabinet system 3; the main air switch 2QF and the air switch 2QF2 are connected in series with a second power supply line of the 2AC cabinet system 2; the second alarm lamp 22 is connected in parallel with the second bell 21 and then connected to the power supply end of the second power supply line, and the second alarm lamp 22 and the second bell 21 are both connected in series with a normally closed relay contact KA2.
In some embodiments, both the first audible and visual alarm 10 and the second audible and visual alarm 20 are mounted in a 3AC cabinet. Is convenient for the observation of staff.
In order to avoid the shutdown of the exhaust fan caused by the power failure of the PLC power supply 4, in this embodiment, 1 set of the first audible and visual alarm device 10 and the second audible and visual alarm device 20 for the power failure of the 1AC cabinet and the 2AC cabinet are respectively added in the 3AC cabinet. When the 1AC cabinet breaks down to cause the total empty switch 1QF of the 1AC cabinet to trip, a first audible and visual alarm device 10 arranged in the 3AC cabinet acts, namely, a first bell 11 sounds long and a first alarm lamp 12 flashes to alarm. Similarly, when the 2AC cabinet fails and causes the total air-break 2QF of the 2AC cabinet to trip, the second audible and visual alarm 20 installed in the 3AC cabinet acts, namely, the second alarm 21 sounds long and the second alarm lamp 22 blinks to alarm. The two relays, the two alarm lamps and the two alarm lamps are added, and normally closed points of the two groups of relays are connected in a ring loop in series and used for controlling the on-off of the alarm lamps and the ring. Normally, the normally closed point of the relay coil is disconnected, and the alarm lamp loop is powered off. When one of the PLC cabinets is powered off, the normally closed point of the corresponding powered off relay is recovered, and the corresponding point bell and the corresponding alarm lamp are electrically operated, so that a driver and a work maintainer can be continuously reminded at any time. Once the alarm appears, the alarm can be judged rapidly according to the alarm bell and the alarm lamp, and the problem is solved in time, so that various accidents are avoided effectively, and the mine safety and stability ventilation are guaranteed better.
Referring to fig. 3,3AC, the cabinet system 3 includes an automatic switching circuit, wherein the automatic switching circuit includes a fuse FU, an air switch 1QF1, an air switch 11QF, an air switch 1QF2, a first reset switch 31, a first power-loss indicator lamp 32, a second reset switch 33, and a second power-loss indicator lamp 34; the PLC power supply 4 is connected with the 1AC cabinet system 1 after sequentially passing through the fuse FU, the air switch 1QF1 and the air switch 1QF 2; the PLC power supply 4 is connected with the 2AC cabinet system 2 after sequentially passing through the fuse FU, the air switch 1QF2 and the air switch 2QF 2; the normally closed relay contact KA2 is connected in series with the first reset switch 31 and the relay KA2 and then is connected between the fuse FU and the air switch 1QF 2; the normally closed relay contact KA1 is connected with the relay KA1 in series and then connected with both sides of the normally closed relay contact KA2 and the relay KA2 in parallel; the second power-off indicator lamp 34 is connected in parallel to two sides of the relay KA 2; the normally closed relay contact KA1 is connected in series with the second reset switch 33 and the relay KA1 and then is connected between the fuse FU and the air switch 2QF 2; the normally closed relay contact KA2 is connected with the relay KA2 in series and then connected with both sides of the normally closed relay contact KA1 and the relay KA1 in parallel; the first power-loss indicator lamp 32 is connected in parallel to both sides of the relay KA1.
The automatic switching circuit of the embodiment realizes an automatic switching function, ensures the safe operation of auxiliary facilities such as a ventilator lubrication station, a hydraulic station and the like, further ensures the safe and reliable operation of the ventilator, and provides powerful guarantee for mine safety production. Specifically, when one uninterruptible power supply loses power due to a fault, the other uninterruptible power supply can be quickly closed, and power supply of the 1AC cabinet and the 2AC cabinet is ensured. Two groups of AC contactors are added to be used as main loop switching-on, two groups of intermediate relays are used as auxiliary contacts, two groups of indicator lamps and a reset switch are matched, and when one uninterruptible power supply loses power, the AC contactors are quickly attracted, so that the section of PLC cabinet is ensured to have power. After the incoming call, the reset switch is pressed down to switch off the brake.
Referring to fig. 4, the plc power source 4 includes a first battery box 41, a first UPS42, a second battery box 43, and a second UPS44; the first battery box 41 is connected with the first UPS42, and the second battery box 43 is connected with the second UPS44; one end of the first UPS42 is connected with the 1-section low voltage, the other end of the first UPS42 is connected with one end of the second UPS44 after passing through the air switch 1QF1, the air switch 11QF and the air switch 2QF1 in sequence, and the other end of the second UPS44 is connected with the 2-section low voltage; 1 the AC cabinet system 1 is connected between the air switch 1QF1 and the air switch 11QF through the air switch 1QF2, and the 2 the AC cabinet system 2 is connected between the air switch 2QF1 and the air switch 11QF through the air switch 2QF 2.
The PLC power supply 4 of the embodiment supplies power to the 1AC cabinet system 1 and the 2AC cabinet system 2 respectively after passing through the 3AC cabinet system 3, and is provided with the first audible and visual alarm device 10 and the second audible and visual alarm device 20 respectively to determine the faults of the 1AC cabinet system 1 and the 2AC cabinet system 2 and remind workers, so that the workers can receive the fault information at the first time and solve the problems in time, thereby effectively avoiding the shutdown of an exhaust fan caused by various accidents and ensuring the safe and stable operation of a mine well. And through reforming in 3AC cabinet system 3, set up automatic switching circuit, when one uninterrupted power source loses power because of the trouble, another uninterrupted power source can close rapidly, can guarantee 1AC cabinet system 1, 2AC cabinet system 2 power supply, need not to interrupt the operation.
The embodiment has higher reliability and economy, and the device is safe and reliable, and has simple structure, convenient installation and use and no maintenance. Meanwhile, the cost is high because the number of required components is small and a large amount of cost is not needed.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The above-described embodiments merely represent embodiments of the utility model, the scope of the utility model is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (7)
1. A power failure protection alarm device of a PLC cabinet power supply is characterized in that: the system comprises a 1AC cabinet system (1), a 2AC cabinet system (2), a 3AC cabinet system (3) and a PLC power supply (4);
the PLC power supply (4) is connected with the 1AC cabinet system (1) and the 2AC cabinet system (2) respectively after passing through the 3AC cabinet system (3);
a first audible and visual alarm device (10) is arranged in the 1AC cabinet system (1), the 1AC cabinet system (1) fails, and the first audible and visual alarm device (10) acts;
a second audible alarm device (20) is arranged in the 2AC cabinet system (2), the 2AC cabinet system (2) fails, and the second audible alarm device (20) acts.
2. The PLC cabinet power loss protection alarm device of claim 1, wherein: the 1AC cabinet system (1) comprises a first power supply line, a total air switch 1QF, an air switch 1QF2 and a first audible and visual alarm device (10), wherein the first audible and visual alarm device (10) comprises a first alarm lamp (12) and a first bell (11);
the first power supply line is connected with a 3AC cabinet system (3); the main air switch 1QF and the air switch 1QF2 are connected in series with a first power supply line of the 1AC cabinet system (1);
the first alarm lamp (12) is connected with the first bell (11) in parallel and then is connected to the power supply end of the first power supply line, and the first alarm lamp (12) and the first bell (11) are both connected with a normally closed relay contact KA1 in series.
3. The PLC cabinet power loss protection alarm device of claim 2, wherein: the first audible and visual alarm device (10) is arranged in the 3AC cabinet system (3).
4. The PLC cabinet power loss protection alarm device of claim 1, wherein: the 2AC cabinet system (2) comprises a second power supply line, a total air switch 2QF, an air switch 2QF2 and a second audible alarm device (20), wherein the second audible alarm device (20) comprises a second alarm lamp (22) and a second bell (21);
the second power supply line is connected with a 3AC cabinet system (3); the main air switch 2QF and the air switch 2QF2 are connected in series with a second power supply line of the 2AC cabinet system (2);
the second alarm lamp (22) is connected with the second bell (21) in parallel and then is connected to the power supply end of the second power supply line, and the second alarm lamp (22) and the second bell (21) are both connected with normally closed relay contacts KA2 in series.
5. The PLC cabinet power loss protection alarm device of claim 4, wherein: the second audible alarm device (20) is arranged in the 3AC cabinet system (3).
6. The PLC cabinet power loss protection alarm device of claim 1, wherein: the 3AC cabinet system (3) comprises an automatic switching circuit, wherein the automatic switching circuit comprises a fuse FU, an air switch 1QF1, an air switch 11QF, an air switch 1QF2, a first reset switch (31), a first power-off indicator lamp (32), a second reset switch (33) and a second power-off indicator lamp (34);
the PLC power supply (4) is connected with the 1AC cabinet system (1) after sequentially passing through the fuse FU, the air switch 1QF1 and the air switch 1QF 2; the PLC power supply (4) is connected with the 2AC cabinet system (2) after sequentially passing through the fuse FU, the air switch 1QF2 and the air switch 2QF 2;
the normally closed relay contact KA2 is connected in series with the first reset switch (31) and the relay KA2 and then is connected between the fuse FU and the air switch 1QF 2; the normally closed relay contact KA1 is connected with the relay KA1 in series and then connected with both sides of the normally closed relay contact KA2 and the relay KA2 in parallel; the second power-off indicator lamps (34) are connected in parallel to two sides of the relay KA 2;
the normally closed relay contact KA1 is connected in series with the second reset switch (33) and the relay KA1 and then is connected between the fuse FU and the air switch 2QF 2; the normally closed relay contact KA2 is connected with the relay KA2 in series and then connected with both sides of the normally closed relay contact KA1 and the relay KA1 in parallel; the first power failure indicator lamps (32) are connected in parallel to two sides of the relay KA1.
7. The PLC cabinet power loss protection alarm device of claim 1, wherein: the PLC power supply (4) comprises a first battery box (41), a first UPS (42), a second battery box (43) and a second UPS (44);
the first battery box (41) is connected with a first UPS (42), and the second battery box (43) is connected with a second UPS (44);
one end of the first UPS (42) is connected with the 1-section low voltage, the other end of the first UPS is connected with one end of the second UPS (44) after passing through the air switch 1QF1, the air switch 11QF and the air switch 2QF1 in sequence, and the other end of the second UPS (44) is connected with the 2-section low voltage;
the 1AC cabinet system (1) is connected between the air switch 1QF1 and the air switch 11QF through the air switch 1QF2, and the 2AC cabinet system (2) is connected between the air switch 2QF1 and the air switch 11QF through the air switch 2QF 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321280142.9U CN219643656U (en) | 2023-05-22 | 2023-05-22 | Power-loss protection alarm device for PLC cabinet power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321280142.9U CN219643656U (en) | 2023-05-22 | 2023-05-22 | Power-loss protection alarm device for PLC cabinet power supply |
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| Publication Number | Publication Date |
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| CN219643656U true CN219643656U (en) | 2023-09-05 |
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|---|---|---|---|
| CN202321280142.9U Active CN219643656U (en) | 2023-05-22 | 2023-05-22 | Power-loss protection alarm device for PLC cabinet power supply |
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| Country | Link |
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| CN (1) | CN219643656U (en) |
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2023
- 2023-05-22 CN CN202321280142.9U patent/CN219643656U/en active Active
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