CN1440110A - Motor protector - Google Patents
Motor protector Download PDFInfo
- Publication number
- CN1440110A CN1440110A CN03104620A CN03104620A CN1440110A CN 1440110 A CN1440110 A CN 1440110A CN 03104620 A CN03104620 A CN 03104620A CN 03104620 A CN03104620 A CN 03104620A CN 1440110 A CN1440110 A CN 1440110A
- Authority
- CN
- China
- Prior art keywords
- switch
- motor
- motor protector
- temperature
- protector
- 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.)
- Pending
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Classifications
-
- 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
- H02H7/08—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 dynamo-electric motors
- H02H7/085—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 dynamo-electric motors against excessive load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
Landscapes
- Thermally Actuated Switches (AREA)
- Stopping Of Electric Motors (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a motor protector for protecting a motor, the protector is connected in a circuit which supplies electric power to the motor. The motor protector comprises a first switch and a second switch. The first switch includes a head driver and is connected in the circuit. When the heat driver is moved, the first switch turns on and turns off the circuit. The second switch is connected in the circuit and includes a first and a second heat driver to turns on and turns off the circuit. The first and the second switch are electrically connected in series, and driving temperatures of the first and second heat drivers of the second switch are different from each other.
Description
Technical field
The present invention relates to a kind of motor protector that is used for protecting air compressor motor, this motor for example can be used for air-conditioning, refrigerator etc.
Background technology
Typically; be used for the motor of compressor of air conditioner; motor protector is provided to survey abnormal heat and produces or abnormal current; and this abnormal heat produces or abnormal current results under such situation: the rotor of motor is obstructed, and has perhaps applied excessive load on the rotor.
This motor protector known in the art is illustrated among Fig. 1.Motor protector has adjusts screw 103, and this screw is arranged on the center of cylindrical base 102 of tool openend, and this matrix 102 is typically formed by electrical insulating material such as resin.The prominent moving bimetallic dish type element 104 of dish type is installed on the end of the adjustment screw 103 that is positioned at matrix 102, and movable contactor 105 and 106 is installed on two edges of bi-metal plate 104.
A pair of fixed contact 107 and 108 is positioned adjacent to the inwall of matrix 102, thereby can contact movable contactor 105 and 106.One of them fixed contact 107 is connected on the heater 109, and this heater 109 itself is connected on the connecting terminal 110.Motor protector so is provided with, so that in the circuit of electric current supply in the motor, electric current flow into the connecting terminal 110 from fixed contact 108 by bi-metal plate 104, fixed contact 107 and heater 109.
When the rotor of motor because some are former thereby when being obstructed or when motor rotor has applied excessive load; the ambient temperature rising and/or the overcurrent that surround this motor protector cause rising of bi-metal plate 104 temperature or upset suddenly, shown in the dotted line among Fig. 1.In these cases, movable contactor 105 and 106 and fixed contact 107 and 108 electric current that is separated and supplies in the motor be cut off, therefore protected motor.
This motor protector is proved to be very useful when work, still, in some cases, the motor protector after the improvement is desirable.
For example; in the conventional electric motor protector; be obstructed or when excessive load is applied on the motor at rotor; only use a bimetallic element that is used for protecting motor, therefore need the prominent dynamic temperature degree of bi-metal plate to be arranged on such high temperature values: the scope of this high temperature values is 130 to 160 degrees centigrade.
In addition, under the situation that the air compressor motor of air-conditioning uses, can not detect, therefore cause motor protection to have problems because refrigerating gas leaks the temperature that is produced raises at the motor protector of prior art.
Also have; in the motor protector of prior art; if fixed contact 107 and 108 and movable contactor 105 and 106 fusings because of electric arc and contactor material weld together; even so under the situation that rotor is obstructed; can not cut off the electric current that flows in the motor, therefore produce potential dangerous situation.Also have so a kind of possibility, when bi-metal plate arrived time limit mechanical endurance, bi-metal plate 104 was no longer realized its function, and this also may produce dangerous situation.
Summary of the invention
The objective of the invention is, by providing a kind of such motor protector to solve the problem of traditional protector: this motor protector is not only by surveying resistance on the motor rotor or overload situation but also protecting motor by surveying because refrigerating gas leaks the fault that is produced.
Another object of the present invention provides a kind of such motor protector: soldered and when being bonded together or bimetallic element when no longer working, this motor protector can avoid dangerous situation to take place between contactor.
Correspondingly, one aspect of the present invention provides a kind of motor protector, this protector is connected in the circuit that applies electrical power in the motor, this motor protector comprises: first switch, it comprises hot actuating device, first switch is connected in this circuit, and when hot actuating device moves, first switch opens and close described circuit; And second switch, it is connected in this circuit, thereby and comprise that two hot actuating devices open and close circuit, first and second switches in series are electrically connected, and the actuation temperature of two hot actuating devices of second switch is mutually different.
In aspect another of motor protector of the present invention, the hot actuating device of first and second switches is thermally sensitive prominent moving bimetal piece, and each bimetal piece has: first predetermined temperature of selecting, its center of overturning suddenly under this temperature; And the less predetermined temperature of second selection; its upset suddenly turns back to its reset condition when this temperature; the prominent moving bimetal piece of first switch is to be used for electric current conveying member the circuit of electric current supply in the motor; therefore it is to environment temperature of surrounding it and the magnitude of current sensitivity of passing through it; and the first and second prominent moving bimetal piece of second switch are not to be used for electric current conveying member the circuit of electric current supply in the motor; in them each has the first and second different predetermined prominent dynamic temperature degree of selecting; carry out normal work period at the motor that will protect; the first prominent dynamic temperature degree of second bimetal piece of second switch is greater than the first prominent dynamic temperature degree of first bimetal piece of second switch, and the second prominent dynamic temperature degree of second bimetal piece of second switch is less than the temperature of motor protector.
In aspect another of motor protector of the present invention, first and second switches all are contained in the housing, and wherein first switch links to each other with top first matrix of housing, and second switch links to each other with lower part of frame second matrix.
In aspect another of motor protector of the present invention, compare with first switch, second switch is arranged to more in the housing near the motor that will protect.
Description of drawings
Other purpose, advantage and the details of motor protector of the present invention are described in the describing below of the preferred embodiments of the present invention, be described in detail with reference to accompanying drawing, in these accompanying drawings:
Fig. 1 is the cutaway view of the motor protector of prior art;
Fig. 2 is the exploded perspective view of motor protector of the present invention;
Fig. 3 is the vertical view of the motor protector that assembles of Fig. 2;
Fig. 4 is the cutaway view along the line X-X motor protector that intercepted, that assemble of Fig. 3;
Fig. 5 is the upward view of first matrix of motor protector of the present invention;
Fig. 6 is the vertical view of second matrix of motor protector of the present invention, and it shows electrical connection; And
Fig. 7 is a circuit diagram, and it shows the electrical connection of motor protector of the present invention.
Embodiment
Below, at length explain some embodiment of motor protector of the present invention with reference to Fig. 2～Fig. 7.
Below motor protector described in these embodiment be the compressor that is used for air-conditioning etc.Typically, motor protector is directly installed on the outer wall of compressor main body.
Fig. 2 is the exploded perspective view of the motor protector of one embodiment of the present of invention.
In the described motor protector of this embodiment, housing comprises first matrix 2 and second matrix 3.First and second matrixes 2 and 3 are formed by electrical insulating material, as the polyester of resin material class, and form, so that can freely separate mutually by this way.First switch S 1 that the back will be described is set on first matrix 2, and first switch opens and closes according to size of current and the ambient temperature around it by it.First switch has and the identical structure of conventional electric motor protector (this protector was described in front and was illustrated among Fig. 1).
First matrix 2 is formed by the cylindrical member with upper surface, on this upper surface, is provided with four holes 21,22,23 and 24 with equidistance each other, thereby connecting terminal 4,5,6,15 and 16 is installed.These connecting terminals stretch out from four holes of upper surface.Fore-and-aft plane connecting terminal 4,5 and 6 is formed by metal, and for example, these connecting terminals is inserted in hole 21,22 and 23 separately.
And, in first base member 2, except heater 7, also be provided with the bi-metal plate 8 that is used for driving first switch S 1.By adjusting screw 9 and nut 10 bi-metal plate 8 is fixed on first matrix.Should be understood that for motor protector the dispensable element of heater.In addition, some otch 8c are arranged near on a part of bi-metal plate 8 of adjusting screw 9, and this adjustment screw 9 is inserted in the bi-metal plate, thereby the prominent action owing to bi-metal plate is minimized with the concentrated stress that produces.
Be that second matrix 3 of dish type has second switch S2 (this switch then will describe) generally, this switch S 2 has two bi-metal plates 11 and 13.Second switch opens and closes according to the temperature of surrounding environment.Second switch comprises generally: fixed contact 17; First and second bi-metal plates 11 and 13; And movement arm 12.Two connecting terminals 15 and 16 are arranged on again on second matrix 3, so they vertically upward stretch out towards first matrix 2 from second matrix.Under situation about assembling, motor protector has first matrix 2 and second matrix 3, by any in many technology known in the art as screw or Fast Installation (snap fit action) and make these matrix bond together.
Fig. 3 be look from the top of first matrix 2, above the vertical view of motor protector described in the embodiment; And Fig. 4 is the cutaway view that the line X-X along Fig. 3 is intercepted.
As mentioned above, connecting terminal 4,5 and 6 is installed in the motor protector by this way, so that their respective tops is stretched out from the top of first matrix 2.These openings are marked as terminal number #1-#4.
The connecting terminal 4 and 5 that is arranged on terminal number #1 and #2 place is so located, so that the curved lower of each terminal plays a part the fixed contact 4a and the 5a that are electrically connected with a pair of movable contactor 8a and 8b, and this is arranged on the two ends of bi-metal plate 8 movable contactor 8a and 8b.These elements have formed first switch S 1 shown in Figure 7 at last.
As shown in Figure 4, bi-metal plate 8 is circular generally, and carries out bending by this way, thereby has formed cup-shaped.Bi-metal plate is installed on the end of the adjustment screw that is positioned at the first matrix inside, so its protrusion surface will be in the face of second matrix 3.
Bi-metal plate 8 typically forms by following method: the two metal sheets with different heat expansion coefficient is bonded together, makes the sheet metal after being joined together form cup-shaped member then.Correspondingly, when temperature arrives first predetermined value, thereby bi-metal plate is opened switch in the center of overturning suddenly, and when this temperature arrives the second less predetermined value, thereby turns back to off switch on its home position.For example, the scope of first predetermined value of switch S 1 is 140 to 160 degrees centigrade, and the scope of the second less predetermined value is 60 to 80 degrees centigrade.Because bi-metal plate 8 is the part of the circuit of electric current supply in the motor, therefore, the temperature the when magnitude of current of carrying according to the atmospheric temperature around its and it is determined any preset time.Correspondingly, when selecting the predetermined actuation temperature of motor protector, must consider motor protector atmospheric temperature on every side and the electric current that flows through it.For example, being used for the representative temperature scope of drive motor protector is 25 to 100 degrees centigrade, and the typical current delivery value is 5 to 30 amperes.
At terminal number #3 place, be set to the connecting terminal 6 in first matrix 2 and be set to connecting terminal 15 in second matrix 3 and constitute by this way and locate, consequently to stretch out from common hole 23 together, this common hole 23 is set on the top of first matrix.Typically, by welder or other known in the prior art device, these connecting terminals are bonded together.Because this fact, connecting terminal 6 and 15 is electrically connected.
Being used for that heat is supplied to heater 7 in the bi-metal plate 8 is connected on the fixed contact 5a of the coupling part of connecting terminal 6 and connecting terminal 5.Heater can be such shape: this shape evenly distributes in shape the whole of bi-metal plate 8, thus continuously heat delivery in bi-metal plate 8.For this reason, it can form curved shape, as shown in Figure 5.Second matrix 3 comprises generally: connecting terminal 15 and 16; Two bi-metal plates 11 and 13, they are to different responsive to temperatures; And moveable arm 12, and these elements have formed second switch S2 at last.
As shown in Figure 6, as their corresponding coupling part 18a and 17a when being molded in second matrix 3, connecting terminal 15 and 16 is fixed on the correct position.The coupling part 18a of connecting terminal 15 and the coupling part 17a of connecting terminal 16 are connected on the movable connector 18 and fixed contact 17 of moveable arm 12 separately.
When motor protector was in the standard operation temperature, the fixed connector 17 of moveable arm 12 and movable contactor 18 were electrically connected, as shown in Figure 3.Shown in Fig. 4 and 6, moveable arm 12 comprises: standing part 12a, moving part 12b and vertical sheet member, this sheet member is between standing part and moving part.Standing part 12a is fixedlyed connected with fixed contact 17, and fixed contact 17 fixedly contacts with the coupling part 17a of connecting terminal 16.When motor protector was in the standard operation temperature, moving part 12b contacted with the coupling part 18a of connecting terminal 15.Vertically sheet member has protuberance 12c in its lower surface center, at bi-metal plate 11 and 13 prominent when moving, and this protuberance contact bi-metal plate, so the moving part 12b of moveable arm 12 separates with movable contactor 18, so interrupted status of electrically connecting.This sheet member is formed by the alloy of elastomeric spring material such as beryllium and copper.
The mounting portion 14 that is used for installing first and second bi-metal plates 11 and 13 is arranged on the center of second matrix 3.14 places in the mounting portion, first and second bi-metal plates 11 and 13 are piled up on another, and their nonreentrant surface is down.Cover 3a is installed on the bottom of mounting portion, thereby protects the basal surface of second matrix.
First and second bi-metal plates 11 and 13 form by following method separately: two sheet metals with different heat expansion coefficient are bonded together, make the sheet metal after being joined together form cup-shaped member then.Correspondingly, when temperature arrives first predetermined value, thereby bi-metal plate is opened switch in the center of overturning suddenly, and when this temperature arrives the second less predetermined value, thereby turns back to off switch on its home position.As mentioned above, moveable arm 12, the fixed contact 17 that is connected with connecting terminal 16, the movable contactor 18 that is connected with connecting terminal 15 and first and second bi-metal plates 11 and 13 have formed second switch S2 (referring to Fig. 7).The bi-metal plate 11 and 13 of the driving of the control second switch S2 center of under certain temperature, overturning suddenly, therefore the protuberance 12c of moveable arm 12 contacts with 13 by bi-metal plate 11 separately, thereby arm is upwards promoted, therefore opened switch S 2 and closed electric current.
Preferably, in the above-described embodiments, the prominent dynamic temperature degree of first bi-metal plate 11 is configured to be greater than or equal to 120 degrees centigrade, and the return temperature of reset condition that turns back to it is less than 60 degrees centigrade.
On the other hand; at normal motor duration of work; the prominent dynamic temperature degree of second bi-metal plate 13 is configured to the temperature that sets greater than first bi-metal plate 11, for example be arranged to 130 to 140 degrees centigrade, and the return temperature is configured to less than the viewed temperature of motor protector.
The bi-metal plate 11 of second switch S2 and 13 can not be carried electric current to electric current supply to the partial circuit in the motor as being used for, and this just is different from the bi-metal plate 8 of first switch S 1.Because this fact, coil 11 and 13 respond exactly these dishes on every side ambient temperature and open and close switch.
Fig. 7 shows the circuit structure of the motor protector described in this embodiment.The driving power of first switch S 1, heater 7 and second switch S2 and motor M is connected in series.
In the motor protector of this embodiment, the sealed terminal end by motor flows to terminal number #1 from driving power electric current flows to terminal number # 4 by bi-metal plate 8, terminal number #2, heater 7, terminal number #3 and moveable arm 12.Correspondingly, any one in bi-metal plate 8,11 and 13 overturn suddenly under the situation at center, and the power supply circuit of motor is cut off, and has therefore opened among switch S 1 and the S2 any one.When motor was prevented from when working or overloads, bi-metal plate 8 overturn suddenly when actuation temperature is scheduled in the temperature arrival of dish, movable contactor 8a and 8b and fixed contact 4a and 5a branch is opened, as shown in Figure 4.Correspondingly, because first switch is opened, so the power supply circuit of motor makes electric current stop to supply in the motor, so motor has been interrupted.The temperature of bi-metal plate 8 is subjected to flowing through its magnitude of current and the two influence of atmospheric temperature around it.
On the other hand, under the situation of compressor leakage gas, under normal motor working condition, the ambient atmosphere temperature evenly raises, and when temperature arrives predetermined temperature as 120 degrees centigrade, bi-metal plate 11 center of overturning suddenly.Because this effect, bi-metal plate 11 bumps are arranged on the protuberance 12c on the moveable arm 12, consequently the moving part 12b of moveable arm 12 is pushed upwardly, and therefore cut off the electrical connection between movable contactor 18 and the fixed contact 17, and this fixed contact 17 is arranged on second matrix 3.Then, cut off the work of the power supply circuit and the interruption motor of motor.
When expire the mechanical endurance of bi-metal plate 8; perhaps at movable contactor 8a and 8b and fixed contact 4a and 5a by under the fusion bond situation together; switch S 1 is not cut off in the motor protector of prior art, and this will produce potential hazard to the sealed terminal end of motor and compressor.
But; in this case; with regard to the use of motor protector of the present invention; it is undesired when mobile to carry out at electric current; (this temperature raises by abnormal electric current the environment temperature of bi-metal plate 11 response dishes; even the undesired electric current when first switch is not worked raises) and therefore upset has suddenly been opened second switch S2 and has been cut off electric current.
Bigger electric current is applied on the motor or at bi-metal plate because its physical damage and under inoperable situation, be provided with another bi-metal plate 13, this metal dish 13 is at design temperature (snap over) center of overturning suddenly when (this temperature is higher than the prominent dynamic temperature degree centigrade of bi-metal plate 11) as 130.
Because bi-metal plate 13 is prominent moving, bi-metal plate 13 bumps do not have the bi-metal plate 11 and the moveable arm 12 of upset suddenly, therefore movable contactor 18 has been separated with the fixed contact 17 that is arranged on second matrix 3, so disconnected the power supply circuit of motor and the work of motor has been stopped.Since the return temperature of bi-metal plate 13 less than the normal working temperature of motor as-30 degrees centigrade, therefore except under abnormal operating state, be under the utmost point cold state, this dish can not return.Correspondingly, protect motor in the motor by electricity is not led to, and make it keep the sort of state.
According to the present invention described above, except preventing that motor from being stoped and overload, by means of surveying because refrigerating gas leaks caused fault, motor protector can be protected motor.This motor protector also provides such protection: even be bonded together by fusing or under the no longer driven situation of bimetallic element, prevent that motor is subjected to potential dangerous situation at these contactors.
Although should be understood that in order to explain the present invention and described the preferred embodiments of the present invention, the present invention also comprises the equivalent of various distortion and disclosed embodiment, has just described in them some above.For example, bi-metal plate can be designed to be able to change its prominent dynamic temperature degree or return temperature, thereby is suitable for being equipped with any device of this bi-metal plate.
Claims (9)
1. motor protector that is used for protecting motor, this protector is connected in the circuit that applies electrical power in the described motor, and this motor protector comprises:
First switch, it comprises hot actuating device, first switch is connected in this circuit, and when hot actuating device moves, first switch opens and close described circuit; And
Second switch, it is connected in this circuit, thereby and comprise that first and second hot actuating devices open and close this circuit,
It is characterized in that first and second switches in series are electrically connected, and the actuation temperature of first and second hot actuating devices of second switch is mutually different.
2. motor protector as claimed in claim 1; it is characterized in that; the hot actuating device of first and second switches is bimetal piece, each bimetal piece center of under first different temperatures of selecting, overturning suddenly, and under second different temperatures of selecting, turn back to its reset condition.
3. motor protector as claimed in claim 2 is characterized in that second switch comprises switch arm, and this switch arm is according to the driving campaign of the bimetal piece of second switch.
4. motor protector as claimed in claim 2; it is characterized in that; the bimetal piece of first switch is as being used for the electric current conveying member of the partial circuit of electric current supply in the motor; therefore it is to environment temperature of surrounding it and the magnitude of current sensitivity of passing through it; and the bimetal piece of second switch is not as being used for the electric current conveying member of the partial circuit of electric current supply in the motor, so they are only to surrounding their ambient temperature sensitivity.
5. motor protector as claimed in claim 2; it is characterized in that; carry out normal work period at the motor that will protect; first temperature of a bimetal piece in these bimetal piece of second switch is higher than first temperature of another bimetal piece of second switch, and second temperature of a described bimetal piece is lower than the temperature of motor protector.
6. motor protector as claimed in claim 1 is characterized in that first and second switches all are contained in the housing.
7. motor protector as claimed in claim 6 is characterized in that, housing comprises first matrix that links to each other with first switch and second matrix that links to each other with second switch.
8. motor protector as claimed in claim 7 is characterized in that, compares with first switch, and second switch is disposed in the housing of the close more motor that will protect.
9. motor protector as claimed in claim 7 is characterized in that second switch is set on the mounting portion of second matrix, thus the heat that motor produced faster, that response more accurately will be protected.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0008454A KR100452855B1 (en) | 2002-02-18 | 2002-02-18 | Motor protector |
| KR0008454/2002 | 2002-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1440110A true CN1440110A (en) | 2003-09-03 |
Family
ID=27800635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03104620A Pending CN1440110A (en) | 2002-02-18 | 2003-02-18 | Motor protector |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100452855B1 (en) |
| CN (1) | CN1440110A (en) |
| MY (1) | MY125843A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661854B (en) * | 2008-08-25 | 2012-07-04 | 三洋电机株式会社 | Over current protection device |
| CN101661855B (en) * | 2008-08-25 | 2012-07-11 | 三洋电机株式会社 | Over current protection device |
| CN102097786B (en) * | 2009-12-11 | 2016-01-27 | 森萨塔科技（常州）有限公司 | Motor protecter |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100474346B1 (en) * | 2002-10-16 | 2005-03-10 | 엘지전자 주식회사 | Overheat protection apparatus for induction motor |
| CN102269158A (en) * | 2011-07-01 | 2011-12-07 | 上海航天科工电器研究院有限公司 | External compressor protector |
| CN112234774B (en) * | 2020-09-29 | 2023-06-13 | 浙江优力仕电驱动科技有限公司 | Motor protection system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR850001592B1 (en) * | 1983-10-20 | 1985-10-19 | 김인석 | Over current relay |
| KR910002457B1 (en) * | 1988-07-22 | 1991-04-22 | 삼화기연 주식회사 | Electronic relay |
| JPH04244732A (en) * | 1991-01-29 | 1992-09-01 | Mitsubishi Materials Corp | Surge absorbing circuit and surge absorber formed thereof |
| JPH11288649A (en) * | 1998-03-31 | 1999-10-19 | Texas Instr Japan Ltd | Motor protector |
| JP2990183B1 (en) * | 1998-09-17 | 1999-12-13 | 東北日本電気株式会社 | AC contact protection device, switching system, and AC contact protection method |
-
2002
- 2002-02-18 KR KR10-2002-0008454A patent/KR100452855B1/en not_active IP Right Cessation
-
2003
- 2003-02-18 CN CN03104620A patent/CN1440110A/en active Pending
- 2003-02-18 MY MYPI20030557A patent/MY125843A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661854B (en) * | 2008-08-25 | 2012-07-04 | 三洋电机株式会社 | Over current protection device |
| CN101661855B (en) * | 2008-08-25 | 2012-07-11 | 三洋电机株式会社 | Over current protection device |
| CN102097786B (en) * | 2009-12-11 | 2016-01-27 | 森萨塔科技（常州）有限公司 | Motor protecter |
Also Published As
| Publication number | Publication date |
|---|---|
| MY125843A (en) | 2006-08-30 |
| KR100452855B1 (en) | 2004-10-14 |
| KR20030068816A (en) | 2003-08-25 |
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| RJ01 | Rejection of invention patent application after publication |