CN201674203U - Electric wiring protective device - Google Patents
Electric wiring protective device Download PDFInfo
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- CN201674203U CN201674203U CN2010201069637U CN201020106963U CN201674203U CN 201674203 U CN201674203 U CN 201674203U CN 2010201069637 U CN2010201069637 U CN 2010201069637U CN 201020106963 U CN201020106963 U CN 201020106963U CN 201674203 U CN201674203 U CN 201674203U
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Abstract
The utility model relates to the field of electricity utilization safety protection, in particular to an electric wiring protective device. According to the embodiment of the utility model, the electric wiring protective device comprises a phase line passage (10), a zero line passage (20) and an earth line passage (30) as well as an error detection circuit (40), a signal driving circuit (50) and a tripping assembly (60), wherein the error detection circuit (40) comprises a current transformer (400) consisting of a first primary winding (411), a second primary winding (412), a third primary winding (413) and a secondary winding (421), and the error detection circuit (40) is arranged corresponding to the errors of the circuit so as to generate an error detection signal in the secondary winding; the signal driving circuit (50) is connected to the secondary winding and arranged corresponding to the error detection signal so as to generate a trigger signal; and the tripping assembly (60) is connected to the signal driving circuit and arranged corresponding to the trigger signal so as to disconnect the phase line passage, the zero line passage and the earth line passage. The electric wiring protective device can not only protect the electricity leakage of the phase line, but also protect the electricity leakage of the earth line.
Description
Technical field
The utility model relates to Electrical Safety protection field, relates in particular to the electric Wiring protection device of the breaking characteristics that have between input and the output.
Background technology
For the leakage current of avoiding household electrical appliance damages the user,, the device with leakage current defencive function is installed such as the power supply input side of electric heater, refrigerator etc. usually at household electrical appliance.General existing protective device all has the leakage current defencive function of phase line.Earth leakage protective device of the prior art adopts current transformer to detect current imbalance on phase line and the zero line usually, and (current transformer comprises a magnet ring usually; phase line is twined the identical number of turn with zero line on this magnet ring); when the imbalance of phase line and zero line meets or exceeds set point, disconnect the power supply of power consumption equipment.There is following shortcoming in many earth leakage protective devices of the prior art: only electric leakage is protected and not to the ground wire into protection of leaking electricity to phase line.The metal shell of power consumption equipment usually directly is connected with the ground wire of power supply.When the power supply wiring fault, or insulation when bad between phase line and ground wire, can make ground wire electrification, thereby make that the metal shell of power consumption equipment is also charged.When the user touches charged shell under unwitting situation, will be subjected to personal injury.Perhaps when power consumption equipment was electric heater, outer casing electrification may cause the injury of getting an electric shock to the user by the water that tap is released.
Chinese patent 01129867.7 discloses a kind of leakage protecting plug, has increased ground wire and has detected defencive function.Fig. 1 shows the circuit diagram of this patent.As shown in the figure; this leakage protecting plug increases a zero-sequence current detection ring on ground wire; the secondary output-parallel of the secondary output end of this detection ring and phase line residual current detection ring; local tape electricity and when having electric current to flow through; the secondary output signal of detection ring on the ground wire; handle the action of rear drive tripping mechanism through amplifier, disconnect the power supply of power consumption equipment.There is following shortcoming in the technical scheme of this patent: adopt two zero sequence current mutual inductors to detect leakage current on phase line and the ground wire respectively, increased product cost, simultaneously in product, be difficult in the narrow space fix two magnet rings, influenced the stability of product structure.In addition, owing to the mutual inductance between two magnet rings, the magnetic interference effect is bigger, has influenced two current detecting rings accuracy of detection separately, is difficult to guarantee the detection performance of leakage protecting plug.
The utility model content
Main purpose of the present utility model provides a kind of electric Wiring protection device in order to overcome above-mentioned defective of the prior art, can protect the phase line electric leakage, can protect the ground wire electric leakage again.
To achieve these goals, the utility model provides a kind of electric Wiring protection device by the following technical solutions, and it comprises: phase line path, zero line path and ground wire path; Error detect circuit, comprise a current transformer, this current transformer comprises the first elementary winding that is connected in the described phase line path, be connected in the second elementary winding in the described zero line path, be connected in the 3rd elementary winding and a secondary winding in the described ground wire path, and described error detect circuit is configured to one of wrong produce the error detection signal at described secondary winding in response to following at least: the mistake of the mistake of described phase line path, described zero line path, the mistake of described ground wire path; Signal drive circuit is connected to described secondary winding, is configured to produce triggering signal in response to described error detection signal; Trip assembley therefor is connected to described signal drive circuit, is configured to disconnect in response to described triggering signal the connection of described phase line path, zero line path and ground wire path.
Electric Wiring protection device in the utility model can not only detect the phase line electric leakage, but also detect the ground wire electric leakage by a current transformer.When the power supply wiring fault takes place; perhaps the power line insulating barrier is aging in long-term the use causes ground wire to contact with phase line and produces electric leakage; electric Wiring protection device in the utility model all can promptly disconnect the electric connection between input and the output, thereby prevents the generation with electrification effectively.
According to embodiment of electric Wiring protection device of the present utility model, wherein, the number of turn of the first elementary winding of the current transformer in the error detect circuit is identical with the number of turn of the second elementary winding, and different with the number of turn of the 3rd elementary winding.Among this embodiment, by difference setting to three elementary umber of turns of current transformer, can avoid when phase line is leaked electricity to ground wire, the situation of omission occur thereby cause induction magnetic flux in current transformer to cancel out each other because leakage current is identical and the first elementary winding is identical with the 3rd elementary umber of turn.
According to an embodiment of electric Wiring protection device of the present utility model, wherein, trip assembley therefor comprises: first pair of contact is used to connect the input and the output of described phase line path; Second pair of contact is used to connect the input and the output of described zero line path; And the 3rd pair of contact, be used to connect the input and the output of described ground wire path; Described trip assembley therefor is configured to separate described first pair of contact, second pair of contact and the 3rd pair of contact in response to described triggering signal.
According to an embodiment of electric Wiring protection device of the present utility model, wherein, described trip assembley therefor is configured in response to described triggering signal, separates described first pair of contact, second pair of contact prior to described the 3rd pair of contact.
Electric Wiring protection device in the foregoing description when detecting the circuit mistake, disconnects earlier being connected of phase line path and zero line path, connection that the back disconnects the ground wire path, has further strengthened the security performance of electric Wiring protection device.
According to an embodiment of electric Wiring protection device of the present utility model, wherein, described trip assembley therefor also comprises: first cantilever, and the one end is connected to the input of described phase line path, and one of described first pair of contact is arranged at the other end of described first cantilever; And second cantilever, the one end is connected to the input of described zero line path, and one of described second pair of contact is arranged at the other end of described second cantilever.
According to an embodiment of electric Wiring protection device of the present utility model, wherein, described trip assembley therefor also comprises: first cantilever, and the one end is connected to the output of described phase line path, and one of described first pair of contact is arranged at the other end of described first cantilever; And second cantilever, the one end is connected to the output of described zero line path, and one of described second pair of contact is arranged at the other end of described second cantilever.In this embodiment, under off state, first cantilever and second cantilever can be not charged, thereby the security performance of electric Wiring protection device is better.
An embodiment according to electric Wiring protection device of the present utility model; wherein; described trip assembley therefor also comprises: the 3rd cantilever, one end are connected to the input or the output of described ground wire path, and one of described the 3rd pair of contact is arranged at the other end of described the 3rd cantilever.Wherein, be connected to when an end of the 3rd cantilever under the situation of output of ground wire path, the security performance of electric Wiring protection device is better.
Description of drawings
By reading the detailed description of doing with reference to the following drawings that non-limiting example is done, other features, objects and advantages of the present utility model will become more apparent:
Fig. 1 shows the circuit diagram of a kind of leakage protecting plug in the prior art;
Fig. 2 shows the circuit diagram according to the electric Wiring protection device of an embodiment of the present utility model;
Fig. 3 shows the circuit diagram according to the electric Wiring protection device of an embodiment of the present utility model;
Fig. 4 a shows the structural representation of electric Wiring protection device under off state according to an embodiment of the present utility model;
Fig. 4 b shows the structural representation of electric Wiring protection device in state change process according to an embodiment of the present utility model;
Fig. 4 c shows the structural representation of electric Wiring protection device under reset mode according to an embodiment of the present utility model;
In the drawings, run through different diagrammatic sketch, identical or similar Reference numeral is represented characteristic of correspondence.
Embodiment
Fig. 2 shows the circuit diagram according to the electric Wiring protection device of an embodiment of the present utility model.As shown in the figure, the electric Wiring protection device among this embodiment comprises phase line path 10, zero line path 20, ground wire path 30, error detect circuit 40, signal drive circuit 50, trip assembley therefor 60.
Trip assembley therefor 60 is connected to signal drive circuit 50, is configured to disconnect in response to described triggering signal the connection of phase line path 10, zero line path 20 and ground wire path 30.
Under the normal situation about using of circuit, the electric current that flows through among the first elementary winding 411 and the second elementary winding 412 should be equivalent and reverse, should not have electric current to flow through among the 3rd elementary winding 413; That is phase line path 10 and zero line path 20 current balance types, and ground wire path 30 no currents.
When one of mistake below the generation at least: the mistake of the mistake of phase line path 10, zero line path 20, the mistake of ground wire path 30, can cause the current imbalance between the first elementary winding 411 and the second elementary winding 412 usually or have electric current to flow through in the 3rd elementary winding 413.Then, in secondary winding 421, will produce the error detection signal in response to above-mentioned mistake.
Typically, signal drive circuit 50 comprises operational amplification circuit and silicon-controlled device; Trip assembley therefor 60 comprises coil 69 and three switches 61,62,63 of a ribbon core, is connected among phase line path 10, zero line path 20, the ground wire path 30.When the circuit operate as normal, three switch 61,62,63 closures keep respectively between the input of phase line path 10, zero line path 20, ground wire path 30 and the output electrically connecting.In case the error detection signal that produces on the secondary winding 421 satisfies predetermined condition, will amplify and export a high level signal by operational amplification circuit, this high level signal is transfused to the control utmost point of silicon-controlled device usually, is used to control the silicon-controlled device conducting.Can produce a big current signal when the silicon-controlled device conducting, this big current signal is triggering signal.Work as triggering signal, that is big current signal, when flowing through the coil 69 in the trip assembley therefor 60, to produce magnetic field makes iron core move, thereby cause the mutual motion of other mechanisms, consequently cut-off switch 61,62,63, cut off phase line path 10, zero line path 20, the input of ground wire path 30 and the electric connection between the output, to guarantee the safety of power consumption equipment.
Electric Wiring protection device shown in Figure 2 also comprises a power module 90.Power module 90 is connected to phase line path 10 and zero line path 20.Typically, power module 90 comprises bridge rectifier, changes alternating current into direct current, for signal drive circuit 50 grades provide power supply.Those skilled in the art will be understood that power module 90 also can adopt powered battery, perhaps other directly direct current supply designs.
Usually, the first elementary winding 411 is identical with the number of turn of the second elementary winding 412.And the number of turn of the 3rd elementary winding 413 can be identical with first, second elementary winding, also can be different.
When the number of turn homogeneous phase while of three elementary windings 411,412,413, the situation of omission may appear.For example, in when, between phase line path 10 and the ground wire path 30 electric leakage taking place when, the magnetic flux that current imbalance between first winding 411 and second winding 412 causes in current transformer 400 might be offset by the magnetic flux that the 3rd elementary winding 413 causes, thereby produces omission.
Therefore, preferably, the number of turn of the first elementary winding 411 is identical with the number of turn of the second elementary winding 412, and different with the number of turn of the 3rd elementary winding 413.
As shown in Figure 2, among this embodiment, the number of turn of the 3rd elementary winding 413 is more than the number of turn of the first elementary winding 411 and the second elementary winding 412.
Fig. 3 shows the circuit diagram according to the electric Wiring protection device of an embodiment of the present utility model.In the embodiment shown in fig. 3, electric Wiring protection device also comprises phase line path 10, zero line path 20, ground wire path 30, error detect circuit 40, signal drive circuit 50 and trip assembley therefor 60; Wherein, on the current transformer 400 in error detect circuit 40, the number of turn of the 3rd elementary winding 413 is less than the number of turn of the first elementary winding 411 and the second elementary winding 412.
Fig. 4 a and Fig. 4 c show the structural representation according to the electric Wiring protection device of an embodiment of the present utility model.
As shown in the figure, trip assembley therefor 60 comprises: coil 69, iron core 68, breechblock 67, and the first pair of contact 611 and 612, second pairs of contacts 621 and 622, the 3rd pairs of contacts 631 and 632.Wherein, the first pair of contact 611 and 612 is connected respectively to the input and the output of phase line path 10, forms switch 61 shown in Figure 3; The second pair of contact 621 and 622 is connected respectively to the input and the output of zero line path 20, forms switch 62 shown in Figure 3; The 3rd pair of contact 631 and 632 is connected respectively to the input and the output of ground wire path 30, forms switch 63 shown in Figure 3.
Electric Wiring protection device also comprises reset assembly shown in the figure, and this reset assembly comprises: button 71, shank 72, set parts 73, spring 74.Button 71 is connecting shank 72, and spring 74 is enclosed within on the shank 72, for button 71 provides elastic force outside electric Wiring protection device.Breechblock 67 stretches among the set parts 73, and shank 72 can pass Kong Eryu breechblock 67 engagements in the set parts 73, thereby under the elastic force effect of spring 74 breechblock 67 and set parts 73 is hung up in the lump.
Under static state, button 71 can be in a primary importance and a second place; Correspondingly, set parts 73 can be in one the 3rd position and one the 4th position.
Show that button 71 is in primary importance and set parts 73 are in the situation of the 3rd position as Fig. 4 a, this situation is corresponding to the off state of electric Wiring protection device.
The electricity Wiring protection device also comprises: first cantilever 613, second cantilever 623, the 3rd cantilever 633.Contact 611 is arranged at an end of first cantilever 613, and contact 621 is arranged at an end of second cantilever 623, and contact 631 is arranged at an end of the 3rd cantilever 633.Comprise end view among Fig. 4 a to Fig. 4 c, first cantilever 613 is blocked by second cantilever 623, thereby not shown in the drawings Reference numeral 613.Shown in the description in the specification and Fig. 4 a and Fig. 4 c, those skilled in the art will be understood that in this embodiment, the plesiomorphism of the form of first cantilever 613 and second cantilever 623, and both lay respectively at the both sides of shank 72.
Show that button 71 is in the second place and set parts 73 are in the situation of the 4th position as Fig. 4 c, this situation is corresponding to the reset mode of electric Wiring protection device.
When electric Wiring protection device is in reset mode; button 71 is in the second place; shank 72 is meshing with each other with breechblock 67, and set parts 73 are in the 4th position, keeps between the input of phase line path 10, zero line path 20, ground wire path 30 and the output electrically connecting.When the aforementioned circuit mistake takes place, signal drive circuit 50 will produce triggering signal, for example big current signal.This triggering signal flows through coil 69, and produce magnetic field and make iron core 68 move, thus bump or pulling breechblock 67.Breechblock 67 separates with shank 72, button 71 is returned to primary importance, set parts 73 are returned to the 3rd position, first cantilever 613, second cantilever 623, the 3rd cantilever 633 also under the effect of separately tension force along with set parts 73 flick, first pair of contact 611 and 612, second pairs of contacts 621 and 622, the 3rd pairs of contacts 631 and 632 all are returned to the state that is separated from each other.The input of phase line path 10, zero line path 20, ground wire path 30 and the electric connection between the output are disconnected, thereby have guaranteed the electrical safety of the power consumption equipment that output connected.
When electric Wiring protection device is in off state; press the button 71; shank 72 will mesh with breechblock 67; under the elastic force effect of spring 74; button 71, shank 72, breechblock 67, set parts 73 will together lift, and first cantilever 613, second cantilever 623, the 3rd cantilever 633 also are set parts 73 and lift.Finally, button 71 moves to primary importance, and set parts 73 move to the 3rd position, and first pair of contact 611 and 612, second pairs of contacts 621 and 622, the 3rd pairs of contacts 631 and 632 contact respectively in twos.Switch 61,62,63 is all closed, conducting respectively between the input of phase line path 10, zero line path 20, ground wire path 30 and the output.
According to an embodiment of the present utility model, at off state, three pairs of contacts are set to: the distance between the 3rd pair of contact 631 and 632 is less than the distance between the distance between first pair of contact 611 and 612 and the second pair of contact 621 and 622.Then, change to from off state the process of reset mode at electric Wiring protection device, the 3rd pair of contact 631 contacts earlier with 632, and contacts behind the first pair of contact 611 and 612, the second pairs of contacts 621 and 622; Otherwise, change to from reset mode the process of off state at electric Wiring protection device, the first pair of contact 611 and 612, the second pairs of contacts 621 and 622 earlier separately, and the 3rd pair of contact 631 and 632 backs are separately.Like this, when the circuit mistake took place, phase line path 10 and zero line path 20 disconnected earlier, and ground wire path 30 backs disconnect, and have further strengthened the security performance of electric Wiring protection device.
Fig. 4 b shows among this embodiment, the situation of electric Wiring protection device in state change process.
Changing to reset mode with electric Wiring protection device by off state is example, and shown in Fig. 4 b, set parts 73 lift, and three cantilevers 613,623,633 all are lifted, and the 3rd pair of contact 631 and 632 takes the lead in contacting.Shown in Fig. 4 a to 4c; the 3rd cantilever 633 has elasticity preferably, and set parts 73 continue to lift, and the stage casing of the 3rd cantilever 633 is along with being lifted; contact respectively with 622 until first pair of contact 611 and 612, second pairs of contacts 621, electric Wiring protection device changes reset mode into.
Those skilled in the art will be understood that; in this embodiment; also can be that the cantilever 634 that contact 632 is connected has elasticity preferably; when set parts 73 continue to lift; the 3rd pair of contact 631 and 632 is along with set parts 73 continue to move up together; contact respectively with 622 until first pair of contact 611 and 612, second pairs of contacts 621, electric Wiring protection device changes reset mode into.
In conjunction with foregoing description, those skilled in the art will be understood that electric Wiring protection device among this embodiment changes to the situation of off state by reset mode, does not repeat them here.
According to an embodiment of the present utility model, an end of first cantilever 613 is connected to the other end that contact 611 among 11, the first pairs of contacts of input of phase line path 10 is arranged at first cantilever 613, and contact 612 is connected to the output 12 of phase line path 10.One end of second cantilever 623 is connected to the other end that contact 621 among 21, the second pairs of contacts of input of zero line path 20 is arranged at second cantilever 623, and contact 622 is connected to the output 22 of zero line path 20.
According to another embodiment of the present utility model, an end of first cantilever 613 is connected to the other end that contact 611 among 12, the first pairs of contacts of output of phase line path 10 is arranged at first cantilever 613, and contact 612 is connected to the input 11 of phase line path 10.One end of second cantilever 623 is connected to the other end that contact 621 among 22, the second pairs of contacts of output of zero line path 20 is arranged at second cantilever 623, and contact 622 is connected to the input 21 of zero line path 20.With reference to figure 4a, in this embodiment, when electric Wiring protection device was in off state, first cantilever 613 and second cantilever 623 were all not charged, thereby the security performance of electric Wiring protection device is better.
According to an embodiment of the present utility model, an end of the 3rd cantilever 633 is connected to the other end that contact 631 among 31, the three pairs of contacts of input of ground wire path 30 is arranged at the 3rd cantilever 633, and contact 632 is connected to the output 32 of ground wire path 30.
According to another embodiment of the present utility model, an end of the 3rd cantilever 633 is connected to the other end that contact 631 among 32, the three pairs of contacts of output of ground wire path 30 is arranged at the 3rd cantilever 633, and contact 632 is connected to the input 31 of ground wire path 30.In this embodiment, when electric Wiring protection device was in off state, even power supply input side generation wiring error makes that the input 31 of ground wire path 30 is charged, the 3rd cantilever 633 can be not charged yet, thereby the security performance of electric Wiring protection device is better.
Those skilled in the art will be understood that the foregoing description all is exemplary and nonrestrictive.The different technologies feature that occurs in different embodiment can make up, to obtain beneficial effect.Those skilled in the art will be understood that and realize the embodiment of other variations of the embodiment that disclosed on the basis of research accompanying drawing, specification and claims.In claims, term " comprises " does not get rid of other devices or step; Indefinite article " one " is not got rid of a plurality of; Term " first ", " second " are used to indicate title but not are used to represent any specific order.Any Reference numeral in the claim all should not be understood that the restriction to protection range.The function of a plurality of parts that occur in the claim can be realized by independent hardware or software module.Some technical characterictic appears in the different dependent claims and does not mean that and these technical characterictics can not be made up to obtain beneficial effect.
Claims (7)
1. an electric Wiring protection device is characterized in that, comprising:
Phase line path (10), zero line path (20) and ground wire path (30);
Error detect circuit (40), comprise a current transformer (400), this current transformer comprises the first elementary winding (411) that is connected in the described phase line path, be connected in the second elementary winding (412) in the described zero line path, be connected in the 3rd an elementary winding (413) and a secondary winding (421) in the described ground wire path, and described error detect circuit is configured to one of wrong produce the error detection signal at described secondary winding in response to following at least: the mistake of the mistake of described phase line path, described zero line path, the mistake of described ground wire path;
Signal drive circuit (50) is connected to described secondary winding, is configured to produce triggering signal in response to described error detection signal;
Trip assembley therefor (60) is connected to described signal drive circuit, is configured to disconnect in response to described triggering signal the connection of described phase line path, zero line path and ground wire path.
2. electric Wiring protection device according to claim 1 is characterized in that, the number of turn of the described first elementary winding is identical with the number of turn of the second elementary winding, and different with the number of turn of the 3rd elementary winding.
3. electric Wiring protection device according to claim 1 and 2 is characterized in that, described trip assembley therefor comprises:
First pair of contact (611,612) is used to connect the input and the output of described phase line path; And
Second pair of contact (621,622) is used to connect the input and the output of described zero line path; And
The 3rd pair of contact (631,632) is used to connect the input and the output of described ground wire path;
Described trip assembley therefor is configured to separate described first pair of contact, second pair of contact and the 3rd pair of contact in response to described triggering signal.
4. electric Wiring protection device according to claim 3 is characterized in that, described trip assembley therefor is configured in response to described triggering signal, separates described first pair of contact, second pair of contact prior to described the 3rd pair of contact.
5. electric Wiring protection device according to claim 3 is characterized in that, described trip assembley therefor also comprises:
First cantilever (613), the one end is connected to the input of described phase line path, and one of described first pair of contact is arranged at the other end of described first cantilever; And second cantilever (623), the one end is connected to the input of described zero line path, and one of described second pair of contact is arranged at the other end of described second cantilever.
6. electric Wiring protection device according to claim 3 is characterized in that, described trip assembley therefor also comprises:
First cantilever (613), the one end is connected to the output of described phase line path, and one of described first pair of contact is arranged at the other end of described first cantilever; And second cantilever (623), the one end is connected to the output of described zero line path, and one of described second pair of contact is arranged at the other end of described second cantilever.
7. electric Wiring protection device according to claim 3 is characterized in that, described trip assembley therefor also comprises:
The 3rd cantilever (633), one end are connected to the input or the output of described ground wire path, and one of described the 3rd pair of contact is arranged at the other end of described the 3rd cantilever.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201069637U CN201674203U (en) | 2010-02-03 | 2010-02-03 | Electric wiring protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201069637U CN201674203U (en) | 2010-02-03 | 2010-02-03 | Electric wiring protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674203U true CN201674203U (en) | 2010-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201069637U Expired - Lifetime CN201674203U (en) | 2010-02-03 | 2010-02-03 | Electric wiring protective device |
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| Country | Link |
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| CN (1) | CN201674203U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142670A (en) * | 2010-02-03 | 2011-08-03 | 上海益而益电器制造有限公司 | Electrical wiring protection device |
| CN102751080A (en) * | 2012-06-01 | 2012-10-24 | 介国安 | Universal current transformer for protector |
-
2010
- 2010-02-03 CN CN2010201069637U patent/CN201674203U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142670A (en) * | 2010-02-03 | 2011-08-03 | 上海益而益电器制造有限公司 | Electrical wiring protection device |
| CN102751080A (en) * | 2012-06-01 | 2012-10-24 | 介国安 | Universal current transformer for protector |
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Granted publication date: 20101215 |