CN111508793B - Overload protection device of low-voltage distribution line distribution transformer - Google Patents
Overload protection device of low-voltage distribution line distribution transformer Download PDFInfo
- Publication number
- CN111508793B CN111508793B CN202010317027.9A CN202010317027A CN111508793B CN 111508793 B CN111508793 B CN 111508793B CN 202010317027 A CN202010317027 A CN 202010317027A CN 111508793 B CN111508793 B CN 111508793B
- Authority
- CN
- China
- Prior art keywords
- fixedly connected
- load
- spring
- control
- armature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
The invention relates to the technical field of power equipment, and discloses an overload protection device of a low-voltage distribution line distribution transformer, which comprises a transformer, wherein the top of the transformer is fixedly connected with a controller, the inside of the controller is fixedly connected with a breaker, the inside of the breaker is movably connected with a control hook, the outside of the control hook is connected with a control spring in a sleeved mode, the outside of the control hook is fixedly connected with a connecting rod, the inside of the breaker is fixedly connected with a first contact block and a second contact block, the outside of the first contact block and the second contact block is hinged and connected with a contact pressure plate, the bottom of the contact pressure plate is fixedly connected with a pressure plate spring, the outside of the first contact block is movably connected with a load electromagnet, and the main circuit is ensured to be disconnected smoothly and timely through the matched use of the control hook, the control spring, the connecting rod, the first contact block and the second contact, the occurrence of faults is avoided, and the circuit burning and the equipment damage are effectively avoided.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to an overload protection device of a distribution transformer of a low-voltage distribution line.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and main components are a primary coil, a secondary coil and an iron core (magnetic core), and the transformer has the main functions of: in the process of installing a transformer on a line, an overload protection device is usually arranged for protecting equipment safety and line safety, so that the main power line is prevented from being damaged due to overheating of a protector caused by overload.
The existing transformer overload protection device is usually composed of a fuse wire or a voltage transformer, however, part faults are often easily generated in the mode, the protection cannot be completed, the reaction is not timely, when internal elements are damaged due to overhigh temperature, the fuse wire can cut off a circuit, the fuse wire cannot play a protection role, the fuse wire protection device needs to frequently replace the fuse wire, the operation is very troublesome, metal materials are wasted, the existing overload protection device is single in function, timely protection cannot be performed on different conditions, the equipment is easily damaged, and the use range of the equipment is limited.
In order to solve the above problems, the inventor provides an overload protection device for a distribution transformer of a low-voltage distribution line, which has the advantages of sensitive response, low failure rate, capability of protecting a circuit in time and preventing the circuit or equipment from being damaged, large protection range, capability of effectively protecting different conditions, effective operation of the equipment, circuit safety protection and increased application range of the equipment.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a low pressure distribution lines distribution transformer's overload protection device, includes transformer, controller, breaks, control hook, control spring, connecting rod, first touch multitouch, second touch multitouch, contact pressure plate, clamp plate spring, load electro-magnet, power contact, bimetallic strip, heater strip, load armature, load spring, cross drag hook, spacing spring, undervoltage armature, undervoltage spring, undervoltage electro-magnet.
The positions and the connection relations of the structures are as follows:
the top of the transformer is fixedly connected with a controller, the inside of the controller is fixedly connected with a breaker, the inside of the breaker is movably connected with a control hook, the material of the control hook is insulating material, the top of the control hook is provided with a control ring, the outside of the control hook is connected with a control spring in a sleeved mode, the control spring is movably connected with the inside of the breaker in a hinged mode, the top of the control spring is fixedly connected with the breaker, the bottom of the control spring is fixedly connected with a connecting rod, the outside of the control hook is fixedly connected with a connecting rod, the inside of the breaker is fixedly connected with a first contact block and a second contact block, the outside of the first contact block and the second contact block is hinged with a contact pressure plate, the bottom of the contact pressure plate is fixedly connected with a pressure plate spring, the outside of the first contact block is movably connected with a load electromagnet, and the load electromagnet is electrically connected with the first contact, the load electromagnet is fixedly connected with the outside of the breaker, the left side of the load electromagnet is provided with a coil extension section, the coil extension section is fixedly connected with the power contact, the external part of the load electromagnet is fixedly connected with a power contact, the external part of the power contact is movably connected with a bimetallic strip, the bimetallic strip is electrically connected with the main circuit, the bimetallic strip is fixedly connected inside the controller, the outer part of the bimetallic strip is movably connected with a heating wire, the outer part of the load electromagnet is movably connected with a load armature, the outer part of the load armature is fixedly connected with a load spring, the inside of the trigger is hinged with a cross-shaped drag hook, the outside of the cross-shaped drag hook is fixedly connected with a limit spring, the outside swing joint of cross drag hook has undervoltage armature, the outside fixedly connected with undervoltage spring of undervoltage armature, the outside swing joint of undervoltage armature has the undervoltage electro-magnet.
Preferably, the heating wire and the main circuit are connected in series.
Preferably, the load armature is hinged inside the controller, and the load armature is movably connected with the cross draw hook.
Preferably, the load spring is fixedly connected between the load armature and the trigger.
Preferably, the cross draw hook is movably connected with the control hook, and the cross draw hook is movably connected with the undervoltage armature.
Preferably, the limiting spring is located inside the breaker, and the limiting spring is fixedly connected between the cross-shaped draw hook and the breaker.
Preferably, the undervoltage armature is hinged inside the controller.
Preferably, the undervoltage electromagnet is fixedly connected with the breaker, and the undervoltage electromagnet is electrically connected with the main circuit.
Advantageous effects
Compared with the prior art, the invention provides an overload protection device of a distribution transformer of a low-voltage distribution line, which has the following beneficial effects:
1. this overload protection device of low pressure distribution lines distribution transformer uses through the cooperation of control hook, control spring, connecting rod, first feeler and second feeler to guarantee that the main circuit disconnection is in time smoothly, avoid the trouble to take place, effectively avoid the circuit to burn out and equipment to take place to damage.
2. This overload protection device of low pressure distribution lines distribution transformer uses through the cooperation of load electro-magnet, load armature, load spring and cross drag hook to when reaching circuit overload, the circuit automatic disconnection effectively plays circuit overload protection's effect, avoids equipment and circuit to damage.
3. This overload protection device of low pressure distribution lines distribution transformer uses through the cooperation of power contact, bimetallic strip and heater strip to heater strip heating bimetallic strip when circuit current transships, thereby load electromagnetism ferromagnetism increases, reaches the disconnected state of control circuit, further protects circuit and equipment safety.
4. This overload protection device of low pressure distribution lines distribution transformer uses through the cooperation of cross drag hook, undervoltage armature, undervoltage spring and undervoltage electromagnet to when circuit voltage descends, undervoltage electromagnet control circuit is disconnected, further carries out circuit and equipment protection.
Drawings
FIG. 1 is a schematic view of the overall connection of the structure of the present invention;
FIG. 2 is a schematic diagram of the connection of a structural controller, a trip device, a load electromagnet, a load armature, an undervoltage electromagnet and an undervoltage armature of the present invention;
FIG. 3 is an enlarged view of the connection of the connecting rod, the contact pressure plate, the pressure plate spring and the second contact block of part A of the structure diagram of FIG. 2;
fig. 4 is an enlarged schematic view of the connection of the heating wire, the bimetal, the load electromagnet and the power contact in part B of the structure diagram 2 of the invention.
In the figure: 1. a transformer; 2. a controller; 3. a trigger; 4. a control hook; 5. a control spring; 6. a connecting rod; 7. a first contact block; 8. a second contact block; 9. a contact platen; 10. a pressure plate spring; 11. a load electromagnet; 12. an electrical power contact; 13. a bimetal; 14. heating wires; 15. a load armature; 16. a load spring; 17. a cross draw hook; 18. a limiting spring; 19. an undervoltage armature; 20. an underpressure spring; 21. an under-voltage electromagnet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
Referring to fig. 1-4, an overload protection device for a distribution transformer of a low-voltage distribution line includes a transformer 1, a controller 2, a breaker 3, a control hook 4, a control spring 5, a connecting rod 6, a first contact block 7, a second contact block 8, a contact pressure plate 9, a pressure plate spring 10, a load electromagnet 11, a power contact 12, a bimetallic strip 13, a heating wire 14, a load armature 15, a load spring 16, a cross-shaped draw hook 17, a limit spring 18, an undervoltage armature 19, an undervoltage spring 20, and an undervoltage electromagnet 21.
The positions and the connection relations of the structures are as follows:
the top of the transformer 1 is fixedly connected with a controller 2, the inside of the controller 2 is fixedly connected with a trigger 3, the inside of the trigger 3 is movably connected with a control hook 4, the control hook 4 is made of insulating material, the top of the control hook 4 is provided with a control ring, the outside of the control hook 4 is connected with a control spring 5 in a sleeved mode, the control spring 5 is movably connected with the inside of the trigger 3, the top of the control spring 5 is fixedly connected with the trigger 3, the bottom of the control spring 5 is fixedly connected with a connecting rod 6, the outside of the control hook 4 is fixedly connected with a connecting rod 6, the inside of the trigger 3 is fixedly connected with a first contact block 7 and a second contact block 8, and the control hook 4, the control spring 5, the connecting rod 6, the first contact block 7 and the second contact block 8 are matched for use, so that the smooth and timely disconnection of a main circuit is ensured, the occurrence of faults is avoided, and the circuit, the outer parts of the first contact block 7 and the second contact block 8 are hinged with a contact pressure plate 9, and the bottom of the contact pressure plate 9 is fixedly connected with a pressure plate spring 10.
The external part of the first contact block 7 is movably connected with a load electromagnet 11, the load electromagnet 11 is electrically connected with the first contact block 7, the load electromagnet 11 is fixedly connected with the external part of the breaker 3, the left side of the load electromagnet 11 is provided with a coil extension section, the coil extension section is fixedly connected with an electric contact 12, the external part of the load electromagnet 11 is fixedly connected with an electric contact 12, the external part of the electric contact 12 is movably connected with a bimetallic strip 13, the bimetallic strip 13 is electrically connected with a main circuit, the bimetallic strip 13 is fixedly connected with the internal part of the controller 2, the external part of the bimetallic strip 13 is movably connected with a heating wire 14, the heating wire 14 is connected with the main circuit in series, and the heating wire 14 is used by matching the electric contact 12, the bimetallic strip 13 and the heating wire 14 when the circuit current is overloaded, so that the magnetism of the load electromagnet 11 is increased, further protection circuit and equipment safety, the outside swing joint of load electro-magnet 11 has load armature 15, load armature 15 articulates the inside of connecting at controller 2, and load armature 15 and cross drag hook 17 swing joint, the outside fixedly connected with load spring 16 of load armature 15, load spring 16 fixed connection is between load armature 15 and trigger 3, the inside articulated cross drag hook 17 that is connected with of trigger 3, through load electro-magnet 11, load armature 15, load spring 16 and cross drag hook 17's cooperation is used, thereby when reaching the circuit overload, the circuit breaks automatically, effectively play the effect of circuit overload protection, avoid equipment and circuit to damage.
The cross drag hook 17 is movably connected with the control hook 4, the cross drag hook 17 is movably connected with the undervoltage armature 19, the outer part of the cross drag hook 17 is fixedly connected with a limit spring 18, the limit spring 18 is positioned in the breaker 3, the limit spring 18 is fixedly connected between the cross drag hook 17 and the breaker 3, the outer part of the cross drag hook 17 is movably connected with the undervoltage armature 19, the undervoltage armature 19 is hinged and connected with the inner part of the controller 2, the outer part of the undervoltage armature 19 is fixedly connected with the undervoltage spring 20, the outer part of the undervoltage armature 19 is movably connected with the undervoltage electromagnet 21, the undervoltage electromagnet 21 is fixedly connected with the breaker 3, and the undervoltage electromagnet 21, through the matching use of the cross draw hook 17, the undervoltage armature 19, the undervoltage spring 20 and the undervoltage electromagnet 21, therefore, when the voltage of the circuit drops, the undervoltage electromagnet 21 controls the circuit to be disconnected, and further circuit and equipment protection is carried out.
When the device is used, because the transformer 1 is fixedly connected with the controller 2, the controller 2 is fixedly connected with the breaker 3, the breaker 3 is movably connected with the control hook 4, the control hook 4 is movably connected with the control spring 5, the control hook 4 is fixedly connected with the connecting rod 6, the control hook 4 is movably connected with the cross-shaped draw hook 17, the cross-shaped draw hook 17 is hinged and connected with the inside of the breaker 3, the limit spring 18 is positioned inside the breaker 3, the limit spring 18 is fixedly connected between the cross-shaped draw hook 17 and the breaker 3, the breaker 3 is fixedly connected with the first contact block 7 and the second contact block 8, the first contact block 7 and the second contact block 8 are respectively hinged and connected with the contact pressure plate 9, and the contact pressure plate 9 is fixedly connected with the pressure plate spring 10, the control hook 4 stretches the control spring 5 and drives the connecting rod 6 to move downwards, and the connecting rod 6 is in contact connection with the contact pressure plate 9, simultaneously contact clamp plate 9 compression clamp plate spring 10 to effectively guarantee the stability that connecting rod 6 and contact clamp plate 9 are connected, then connecting rod 6 effectively communicates first feeler 7 and second feeler 8, thereby makes the circuit intercommunication, guarantees circuit normal operating.
When the circuit voltage is increased, the load electromagnet 11 is electrically connected with the first contact block 7, the load electromagnet 11 is fixedly connected with the outside of the trigger 3, the load electromagnet 11 is movably connected with the load armature 15, the load armature 15 is fixedly connected with the load spring 16, the load spring 16 is fixedly connected with the trigger 3, and the load armature 15 is movably connected with the cross-shaped draw hook 17, so that when the circuit voltage is increased or short-circuited, the magnetism of the load electromagnet 11 is increased, the adsorption force of the load electromagnet 11 on the load armature 15 is greater than the elastic force of the load spring 16 and the limit spring 18, the load armature 15 pushes the cross-shaped draw hook 17, the limit action of the cross-shaped draw hook 17 on the control hook 4 is lost, the control hook 4 moves upwards under the action of the control spring 5, the control hook 4 drives the connecting rod 6 to move upwards, and the connecting rod 6 is disconnected with the first contact block 7 and the second contact block 8, thereby achieving the effect of circuit load protection.
And when the circuit current is overloaded, because the heating wire 14 is electrically connected with the main circuit, the heating wire 14 is movably connected with the bimetallic strip 13, the bimetallic strip 13 is electrically connected with the main circuit, the bimetallic strip 13 is fixedly connected in the controller 2, the left side of the load electromagnet 11 is provided with a coil extension section, the coil extension section is fixedly connected with the power contact 12, and the power contact 12 is movably connected with the bimetallic strip 13, when the circuit current is overloaded, the heating wire 14 starts to generate heat, because the metal is heated and deformed by different coefficients, the bimetallic strip 13 is heated and bent, when the bimetallic strip 13 is contacted with the power contact 12, according to the electromagnetic induction principle, the number of turns of the electromagnet coil is increased, the electromagnet magnetism is enhanced, the magnetism of the load electromagnet 11 is increased, the adsorption force of the load electromagnet 11 to the load armature 15 is greater than the elastic force of, therefore, the load armature 15 pushes the cross-shaped draw hook 17, and similarly, when the circuit is disconnected, the current overload protection on the circuit is effectively realized.
When the circuit voltage is lower than a set value, because the undervoltage electromagnet 21 is fixedly connected with the trigger 3, and the undervoltage electromagnet 21 is electrically connected with the main circuit, the undervoltage armature 19 is hinged inside the controller 2, the undervoltage armature 19 is fixedly connected with the undervoltage spring 20, and the undervoltage armature 19 is movably connected with the cross-shaped drag hook 17, when the circuit voltage is too low, the magnetism of the undervoltage electromagnet 21 is reduced, the adsorption force of the undervoltage electromagnet 21 on the undervoltage armature 19 and the elastic force of the limit spring 18 are smaller than the elastic force of the undervoltage spring 20, so that the undervoltage armature 19 moves rightwards under the action force of the undervoltage spring 20, and the armature 19 drives the cross-shaped drag hook 17 to move rightwards, so that the cross-shaped drag hook 17 loses the limit effect on the control hook 4, and.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. An overload protection device for a distribution transformer of a low-voltage distribution line, comprising a transformer (1), characterized in that: the top of the transformer (1) is fixedly connected with a controller (2), the inside of the controller (2) is fixedly connected with a breaker (3), the inside of the breaker (3) is movably connected with a control hook (4), the outside of the control hook (4) is connected with a control spring (5) in a sleeved mode, the outside of the control hook (4) is fixedly connected with a connecting rod (6), the inside of the breaker (3) is fixedly connected with a first contact block (7) and a second contact block (8), the outside of the first contact block (7) and the outside of the second contact block (8) are hinged with a contact pressure plate (9), the bottom of the contact pressure plate (9) is fixedly connected with a pressure plate spring (10), the outside of the first contact block (7) is movably connected with a load electromagnet (11), the outside of the load electromagnet (11) is fixedly connected with an electric power contact (12), the external movable connection of the power contact (12) is provided with a bimetallic strip (13), the external movable connection of the bimetallic strip (13) is provided with a heating wire (14), the external movable connection of the load electromagnet (11) is provided with a load armature (15), the external fixed connection of the load armature (15) is provided with a load spring (16), the internal hinged connection of the trigger (3) is provided with a cross drag hook (17), the external fixed connection of the cross drag hook (17) is provided with a limit spring (18), the external movable connection of the cross drag hook (17) is provided with an undervoltage armature (19), the external fixed connection of the undervoltage armature (19) is provided with an undervoltage spring (20), and the external movable connection of the undervoltage armature (19) is provided with an undervoltage electromagnet; the control hook (4) is made of an insulating material, and the top of the control hook (4) is provided with a control ring; the control spring (5) is movably connected inside the breaker (3), the top of the control spring (5) is fixedly connected with the breaker (3), and the bottom of the control spring (5) is fixedly connected with the connecting rod (6); the load electromagnet (11) is electrically connected with the first contact block (7), the load electromagnet (11) is fixedly connected to the outside of the breaker (3), a coil extension section is arranged on the left side of the load electromagnet (11), and the coil extension section is fixedly connected with the power contact (12); the load armature (15) is hinged inside the controller (2), and the load armature (15) is movably connected with the cross draw hook (17); the bimetallic strip (13) is electrically connected with the main circuit, and the bimetallic strip (13) is fixedly connected inside the controller (2); the heating wire (14) is connected with the main circuit in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010317027.9A CN111508793B (en) | 2020-04-21 | 2020-04-21 | Overload protection device of low-voltage distribution line distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010317027.9A CN111508793B (en) | 2020-04-21 | 2020-04-21 | Overload protection device of low-voltage distribution line distribution transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111508793A CN111508793A (en) | 2020-08-07 |
| CN111508793B true CN111508793B (en) | 2021-04-30 |
Family
ID=71876253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010317027.9A Active CN111508793B (en) | 2020-04-21 | 2020-04-21 | Overload protection device of low-voltage distribution line distribution transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111508793B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3997857A (en) * | 1975-09-11 | 1976-12-14 | Westinghouse Electric Corporation | Integral magnetic trip and latch for a circuit interrupter |
| CN103617930A (en) * | 2013-11-23 | 2014-03-05 | 哈尔滨理大晟源科技开发有限公司 | Low voltage circuit breaker |
| CN205680884U (en) * | 2016-06-23 | 2016-11-09 | 惠州市富斯迈电子有限公司 | A kind of portable transducer band overload protection arrangement module |
| CN106786346A (en) * | 2017-02-10 | 2017-05-31 | 黑龙江恒讯科技有限公司 | A kind of IP-based miniature circuit breaker |
| CN206432226U (en) * | 2017-02-20 | 2017-08-22 | 杨丰帆 | A kind of electrical engineering distributor breaker |
| CN208142820U (en) * | 2018-05-30 | 2018-11-23 | 苏琪 | The novel current protection device of Coal Mine Power Distribution System |
-
2020
- 2020-04-21 CN CN202010317027.9A patent/CN111508793B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3997857A (en) * | 1975-09-11 | 1976-12-14 | Westinghouse Electric Corporation | Integral magnetic trip and latch for a circuit interrupter |
| CN103617930A (en) * | 2013-11-23 | 2014-03-05 | 哈尔滨理大晟源科技开发有限公司 | Low voltage circuit breaker |
| CN205680884U (en) * | 2016-06-23 | 2016-11-09 | 惠州市富斯迈电子有限公司 | A kind of portable transducer band overload protection arrangement module |
| CN106786346A (en) * | 2017-02-10 | 2017-05-31 | 黑龙江恒讯科技有限公司 | A kind of IP-based miniature circuit breaker |
| CN206432226U (en) * | 2017-02-20 | 2017-08-22 | 杨丰帆 | A kind of electrical engineering distributor breaker |
| CN208142820U (en) * | 2018-05-30 | 2018-11-23 | 苏琪 | The novel current protection device of Coal Mine Power Distribution System |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111508793A (en) | 2020-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205488000U (en) | Low -voltage circuit breaker | |
| CN110429489B (en) | Power box convenient to cut off power supply fast | |
| CN111180285A (en) | Direct current fuse | |
| CN113990636A (en) | Energy-saving transformer with automatic overload protection function | |
| CN202772081U (en) | Thermal electromagnetic system of miniature circuit breaker | |
| CN111508793B (en) | Overload protection device of low-voltage distribution line distribution transformer | |
| CN102760622B (en) | It is 18mm multifunctional electric leakage circuit breaker that nothing lengthens width | |
| CN201804815U (en) | Single-break wall fireproof switch | |
| CN209015805U (en) | The distribution transforming transformer of overload protection type | |
| CN208189496U (en) | A kind of Thermal protection type control switch | |
| CN203883550U (en) | PC-class dual-power-supply change-over switch | |
| CN101499653A (en) | Method for protecting electrical appliance by over-current side path | |
| CN102280321A (en) | Light load overheating protection breaker | |
| CN202651039U (en) | Miniature breaker | |
| CN203882915U (en) | Four-pole circuit breaker | |
| CN206685338U (en) | A kind of electrical control excess temperature automatic switch | |
| CN206672849U (en) | A kind of special anti-overheat of power equipment disconnecting switch safe to use | |
| CN208539542U (en) | A kind of earth leakage protective device for lacking any one phase power supply and shielding | |
| CN201936806U (en) | Vacuum contact electromagnetic system | |
| CN215869042U (en) | Vacuum contactor with temperature monitoring locking function | |
| CN219418738U (en) | Double-temperature control transformer | |
| CN217933683U (en) | Circuit breaker for earth leakage protection | |
| CN215580551U (en) | Bayonet self-recovery equipment based on remote circuit breaker | |
| CN210129472U (en) | High-power magnetic latching relay | |
| CN219610339U (en) | Plastic case circuit breaker with composite arc extinguishing performance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |