CN200950504Y - Electric power plug having earth leakage protective function - Google Patents
Electric power plug having earth leakage protective function Download PDFInfo
- Publication number
- CN200950504Y CN200950504Y CN 200620133835 CN200620133835U CN200950504Y CN 200950504 Y CN200950504 Y CN 200950504Y CN 200620133835 CN200620133835 CN 200620133835 CN 200620133835 U CN200620133835 U CN 200620133835U CN 200950504 Y CN200950504 Y CN 200950504Y
- Authority
- CN
- China
- Prior art keywords
- plug
- power
- attaching plug
- release
- circuit board
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
The utility model discloses a power plug that has the function of creepage protection. The utility model comprises an enclosure, a live wire of a power supply, a zero line and blades of an earth wire power plug. The utility model is characterized in that a control circuit board that can achieve electric connection and creepage fault detection is arranged in the enclosure. The control circuit board can quickly detect creepage fault of a power cord of the power plug resulting from aging or breakage in real time; cut off the power output of the power plug in time; effectively prevent a power output line of the plug from destroying utilization equipments due to creepage, and prevent users from getting an electric shock or being injured because of creepage.
Description
Technical field
The utility model relates to a kind of attaching plug, refers to a kind of attaching plug with creepage protection function on the household electrical appliance such as air-conditioning, refrigerator, that link to each other with its power line that is installed in especially.
Background technology
Universal day by day along with household electrical appliance, the safe in utilization of household electrical appliance is subject to people's attention day by day.At present, electrical prong structure that people generally use, that link to each other with the household electrical appliance power line is all fairly simple, function singleness, and fail safe is relatively poor.This attaching plug mainly is made of housing, two or three plug blade of being installed on the housing.One end of plug blade links to each other by the power input on the control circuit board in lead and the household electrical appliance.When using household electrical appliance, only need the plug blade of plug inserted in the supply socket that be installed in the wall or the common earth leakage protective socket hole and get final product.This attaching plug just is incorporated into the power supply in the socket on the circuit board of household electrical appliance; make its charged work; and for the leak current fault of attaching plug output (load end) live wire or zero line; and the arcing fault that causes because of live wire and zero line short circuit of attaching plug output without any protective effect, fail safe is relatively poor.
Therefore, press for a kind of attaching plug on the market with creepage protection function, easy to operate, high safety.
Summary of the invention
The existing power supply pin function is single in order to solve, the problem of poor stability; meet the need of market, the purpose of this utility model provides a kind of high safety, can detect the power line leak current fault in real time, the attaching plug with creepage protection function of the plug-in power pack of in time cutting off the electricity supply output.
For achieving the above object, the utility model is by the following technical solutions: a kind of attaching plug with creepage protection function, it comprises housing, is installed in power firestreak, zero line, ground wire attaching plug blade on the housing, it is characterized in that: be provided with a reset button on the surface of described housing, this reset button is connected in the attaching plug current supply circuit;
This attaching plug also includes a control circuit board that the electric power realized connects and leak current fault detects that is installed in the housing;
Whether this control circuit board can be realized transition components that electric power connects and can be realized detecting the power line that links to each other with attaching plug and exist the leakage current detection protection circuit of leak current fault to form by a pair of static contact;
One end of described static contact is welded on the circuit board and links to each other with power firestreak plug blade, zero-power line plug blade respectively, and other end riveting respectively has fixed contact;
Describedly realize that transition components that electric power connects is made of release, a pair of moving contact brachium pontis, a snap close and the coil that is built-in with the dropout iron core;
Release is positioned in the middle of power firestreak plug blade, zero line plug blade and the coil, and its top is provided with a vertical central perforation, and its left and right sides is outward extended with carries arm;
The moving contact brachium pontis lays respectively at the both sides of release, and the one end is welded on the circuit board respectively with live wire, zero line in the attaching plug power supply output line and links to each other, and the other end lays respectively at the top that arm is carried in the release left and right sides; Be positioned at the release left and right sides carry arm top the moving contact brachium pontis the end respectively riveting moving contact is arranged; Described static contact riveting has an end of fixed contact also to lay respectively at the top that arm is carried in the release left and right sides, and its fixed contact is corresponding with the moving contact on the moving contact brachium pontis respectively;
Be embedded with a return pin below the described reset button, the centre of return pin is provided with a groove; This return pin is contained in the central perforation of described release, and can move up and down; Between the lower end of return pin and housing, be provided with a back-moving spring;
But cross the inverted "L" shaped snap close of a move left and right at the middle part of release, be provided with a hole in the end face central authorities of snap close, the sidewall of snap close is connected with dropout iron core in being built in coil, but the effect move left and right of the iron core of being threaded off;
One end of described dropout iron core is provided with the groove of spill; be used to stretch in the draw-in groove on the inverted "L" shaped snap close sidewall; its other end is inserted in the coil; and the end is placed with the dropout spring; two legs of described coil are welded on respectively on the circuit board, are connected with live wire, zero line on the circuit board by leakage current detection protection circuit.
Described leakage current detection protection circuit is made up of controllable silicon, diode, electric capacity, resistance, the tripping coil that is built-in with iron core;
The silicon controlled control utmost point links to each other with the metal screen layer of power line by a resistance; Simultaneously, tripping coil and the live wire, the zero line two ends that are connected in parallel on attaching plug after controllable silicon, diode are connected form a controllable silicon conducting loop;
Between the silicon controlled control utmost point and negative electrode, be parallel with another resistance and electric capacity; Between silicon controlled anode and negative electrode, be parallel with another diode.
The utility model has the advantages that: simple in structure, easy to operate, can detect the attaching plug power line real-time because of the aging or damaged leak current fault that causes, the power supply output of the timely plug of cutting off the electricity supply apace, avoid effectively because of the plug-in power pack output line leaks electricity to the damage that power consumption equipment caused, and the electric shock injury because of leaking electricity user's person being caused.
Description of drawings
Fig. 1 is the utility model perspective view;
Fig. 2 is the utility model decomposition texture schematic diagram;
Fig. 3 removes plan structure schematic diagram behind the loam cake for the utility model;
Fig. 4 is the utility model leakage current detection protection circuit physical circuit figure;
Fig. 5 is the utility model reset mode figure, power input and output electric power connection status cross-sectional view when promptly normally using;
Fig. 6 is the utility model trip status figure, promptly detects to disconnect input and output electric power connection status cross-sectional view after there is leak current fault in power supply output line.
Embodiment
As Fig. 1, Fig. 2, shown in Figure 3, the attaching plug that the utility model is disclosed to have a creepage protection function mainly is made of with the control circuit board that the electric power realized is connected and leak current fault detects in being installed in housing housing, the attaching plug blade that is installed on the housing.
As shown in Figure 1, described housing is combined by loam cake 1 and base 2.Loam cake 1 is provided with reset button (RESET) 7, analogue test button (TEST) 6, status indicator lamp hole 12.It is power firestreak plug blade 4, zero line plug blade 3 and ground wire plug blade 5 that base 2 is provided with three attaching plug blades.One end of power firestreak, zero line, ground wire plug blade 3,4,5 exposes in the housing outside; Control circuit board 13 in the other end passes base 2 and is contained in housing links to each other.
Shown in Fig. 2,3, be installed in and realize in the housing that circuit board 13 that whether power line that electric power connection and detection link to each other with attaching plug exist leak current fault mainly can be realized transition components that electric power is connected and can be realized detecting the power line that links to each other with attaching plug and whether exist the leakage current detection protection circuit of leak current fault to form by a pair of static contact that has fixed contact 29,30, that is welded on the circuit board.
One end of described static contact 29,30 is welded on the circuit board and links to each other with zero-power line plug blade 3 with power firestreak plug blade 4 respectively, and other end riveting respectively has fixed contact 15 and 16.
Describedly realize that transition components that electric power connects mainly is made of release 10, a pair of moving contact brachium pontis 8,9, snap close 23 and the coil 27 that is built-in with dropout iron core 11.
Moving contact brachium pontis 8,9 lays respectively at the both sides of release 10, and the one end is welded on the circuit board 13 respectively with live wire HOT, zero line WHITE in the attaching plug power supply output line and links to each other; The other end lays respectively at the top that arm 21,22 is carried in release 10 left and right sides.Be positioned at release 10 left and right sides carry arm 21,22 tops moving contact brachium pontis 8,9 the end respectively riveting moving contact 17,18 is arranged. Static contact 29,30 rivetings have an end of fixed contact 15,16 also to lay respectively at the top that arm 21,22 is carried in release 10 left and right sides, and its fixed contact 15,16 is corresponding with the moving contact 17,18 on the moving contact brachium pontis 8,9 respectively.When attaching plug is in reset mode (as shown in Figure 5), fixed contact 15,16 contacts with moving contact 17,18 respectively, and the attaching plug power line has power supply output; When attaching plug is in trip status (as shown in Figure 6), fixed contact 15,16 disconnects with moving contact 17,18 respectively, and the attaching plug power line does not have power supply output.
As Fig. 2, Fig. 5, shown in Figure 6, the centre of described release 10 is provided with one can hold the central perforation 20 that the return pin 19 that links to each other with reset button 7 moves up and down longitudinally.At the middle part of release 10, but cross the inverted "L" shaped snap close 23 of a move left and right, be provided with a hole in the end face central authorities of snap close 23, the sidewall of snap close 23 is connected with dropout iron core 11 in being built in coil 27, but the effect move left and right of the iron core 11 of being threaded off.
One end of described dropout iron core 11 is provided with the groove of spill; be used to stretch in the draw-in groove on inverted "L" shaped snap close 23 sidewalls; its other end is inserted in the coil 27; and the end is placed with dropout spring 28; two legs of described coil 27 are welded on respectively on the circuit board 13, are connected with live wire, zero line on the circuit board by leakage current detection protection circuit.
Described return pin 19 be positioned at reset button (RESET) 7 below, return pin 19 is provided with a groove 24, in order to admit snap close 23.Between the lower end of return pin 19 and base 2, be provided with a back-moving spring 25.
Fig. 4 is the utility model leakage current detection protection circuit physical circuit figure.As shown in the figure, this leakage current detection protection circuit mainly is made up of controllable silicon SCR, diode D1, D2, capacitor C 1, resistance R 2, R3, the tripping coil 27 (SOL) that is built-in with the dropout iron core.The control utmost point of controllable silicon SCR links to each other with the metal screen layer L of power line by resistance R 2, simultaneously, tripping coil SOL be connected in parallel on attaching plug live wire HOT, zero line WHITE two ends after controllable silicon SCR, diode D1 connect, form a controllable silicon (SCR) conducting loop.Between the control utmost point of controllable silicon SCR and negative electrode, be parallel with resistance R 3 and charging capacitor C1; Between the anode of controllable silicon SCR and negative electrode, be parallel with another diode D2.
When not having leaky between power firestreak HOT, the neutral line WHITE of attaching plug outlet side LOAD, the ground wire, controllable silicon SCR can conducting, does not have electric current to flow through in the tripping coil 27 (SOL), the attaching plug operate as normal.Live wire HOT when power line, neutral line WHITE, ground wire is because of aging or damaged, when heart yearn exposes, screen L is charged, screen L then, resistance R 2, R3, C1, diode D1 or D2 form the loop, on resistance R 3, form forward voltage drop, trigger the controllable silicon SCR conducting, there is electric current to flow through among the tripping coil SOL and produces magnetic field, make dropout iron core 11 actions that are built among the tripping coil SOL, promote Fig. 5, snap close 23 in 6 moves, and makes reset button RESET escape, and the input LINE of the plug of cutting off the electricity supply is connected with the electric power of output LOAD, thereby, make the output of attaching plug non-transformer.
Operation principle of the present utility model: as shown in Figure 5: after pressing reset button (RESET) 7, groove 24 on the return pin 19 slips in the snap close 23, under the effect of dropout spring 28, hole wall near spring on the snap close 23 is stuck in the groove 24 of return pin, at this moment discharge reset button (RESET) 7, under the effect of back-moving spring 25, return pin 19 moves up, and drive releases 10 by snap close 23 and move up together, make and be placed on release 10 both sides and carry arm 21, moving contact brachium pontis 8 on 22,9 move up, thereby make moving contact brachium pontis 8, moving contact 17 on 9,18 respectively with static contact 29, fixed contact 15 on 30,16 contact conductings, be that the plug-in power pack input is connected with output electric power, household electrical appliance LOAD is charged.
When with plug-in power pack output line that household electrical appliance LOAD links to each other in live wire or zero line when leak current fault occurring, as shown in Figure 4, leakage current on the screen L passes through R2, R3, D1 or D2 and live wire or zero line form the loop, and the generation triggering signal triggers SCR, make the SCR conducting, coil 27, generation is enough to drive the magnetic field of iron core 11, dropout iron core 11 makes puts horizontal snap close 23 actions in release 10, the groove 24 of return pin 19 is skidded off in the hole of inverted "L" shaped snap close 23, release 10 has lost the elastic force of the back-moving spring that passes over from return pin, and at moving contact brachium pontis 8,9 deformation elastic force effect is fallen down, this moment, the moving contact brachium pontis 8, moving contact 17 on 9,18 with static contact 29, fixed contact 15 on 30,16 separately, the input that is attaching plug is connected disconnection with the electric power of output, the power supply of power consumption equipment LOAD is cut off, as shown in Figure 6.
As shown in Figure 1, the utility model also is provided with an analogue test button (TEST) 6 on housing 1.As shown in Figure 5, the one end passes loam cake 1, and the other end is positioned at the top of the analogue test switch 26 that is welded on the control circuit board.As shown in Figure 4, an end of analogue test switch 26 links to each other with live wire HOT in the plug-in power pack output line by resistance R 4, and the other end links to each other with the screen L of plug-in power pack output line.
When thinking that electric power between the input and output of disconnection of plug power supply connects, only need press analogue test button (TEST) 6, make test switch 26 closures, as shown in Figure 4, the live wire HOT of plug-in power pack output has formed current circuit and has produced signal triggering SCR through electronic component and the zero line WHITE on the circuit board, the SCR conducting, there is electric current to flow through in the coil 27, generation is enough to drive the magnetic field of iron core 11, dropout iron core 11 makes puts horizontal snap close 23 actions in release 10, the groove 24 of return pin 19 is skidded off in the hole of inverted "L" shaped snap close 23, release 10 has lost the elastic force of the back-moving spring that passes over from return pin, and at moving contact brachium pontis 8,9 deformation elastic force effect is fallen down, this moment, the moving contact brachium pontis 8, moving contact 17 on 9,18 with static contact 29, fixed contact 15 on 30,16 separately, the input that is attaching plug is connected disconnection with the electric power of output, and the power supply of power consumption equipment LOAD is cut off.
In order to show the operating state of plug, as Fig. 1, shown in Figure 4, the utility model also is provided with display circuit, and this display circuit is made of resistance R 1, LED and diode D3 series connection, and it is connected in parallel between plug-in power pack output live wire HOT, the zero line WHITE.And be provided with the indicator lamp hole 12 that can show the light-emitting diode state on housing 1 surface.During the reset button in being connected on the attaching plug current supply circuit (RESET) 7 closures, the attaching plug power line has power supply output, and LED is bright, and surperficial attaching plug is working properly.During the reset button in being connected on the attaching plug current supply circuit (RESET) 7 escapes, the attaching plug power line does not have power supply output, and LED goes out, and surperficial attaching plug does not have power supply output.
Before opening household electrical appliance, the user should insert this attaching plug in the socket earlier, and guarantees that it is in reset mode; Then, press testing button, this moment, reset button should be upspring, and socket is in trip status, and this illustrates that the detection of electrical leakage of this plug and defencive function are intact, if will continue to use, reset button should be pressed, and made attaching plug be in reset mode.
The above is specific embodiments of the invention and the know-why used, and is any based on the equivalent transformation on the technical solution of the present invention basis, all belongs within the protection range of the present invention.
Claims (4)
1, a kind of attaching plug with creepage protection function, it comprises housing, is installed in power firestreak, zero line, ground wire attaching plug blade on the housing, it is characterized in that:
Be provided with a reset button (RESET) on the surface of described housing, this reset button is connected in the attaching plug current supply circuit;
This attaching plug also includes a control circuit board that the electric power realized connects and leak current fault detects that is installed in the housing;
Whether this control circuit board can be realized transition components that electric power connects and can be realized detecting the power line that links to each other with attaching plug and exist the leakage current detection protection circuit of leak current fault to form by a pair of static contact (29,30);
One end of described static contact (29,30) is welded on the circuit board and links to each other with power firestreak plug blade, zero-power line plug blade respectively, and other end riveting respectively has fixed contact (15 and 16);
Describedly realize that transition components that electric power connects is made of release (10), a pair of moving contact brachium pontis (8,9), a snap close (23) and the coil (27) that is built-in with dropout iron core (11);
Release (10) is positioned in the middle of power firestreak plug blade, zero line plug blade and the coil (27), and its top is provided with a vertical central perforation (20), and its left and right sides is outward extended with carries arm (21,22);
Moving contact brachium pontis (8,9) lays respectively at the both sides of release (10), the one end is welded on the circuit board respectively with live wire, zero line in the attaching plug power supply output line and links to each other, and the other end lays respectively at the top that arm (21,22) are carried in release (10) left and right sides; Be positioned at release (10) left and right sides carry arm (21,22) top moving contact brachium pontis (8,9) the end respectively riveting moving contact (17,18) is arranged; Described static contact (29,30) riveting has an end of fixed contact (15,16) also to lay respectively at the top that arm (21,22) are carried in release (10) left and right sides, and its fixed contact (15,16) is corresponding with the moving contact (17,18) on the moving contact brachium pontis (8,9) respectively;
Be embedded with a return pin (19) below the described reset button (7), the centre of return pin (19) is provided with a groove (24); This return pin (19) is contained in the central perforation (20) of described release (10), and can move up and down; Between the lower end of return pin (19) and housing, be provided with a back-moving spring (25);
At release (10) but the middle part cross the inverted "L" shaped snap close (23) of a move left and right, end face central authorities at snap close (23) are provided with a hole, the sidewall of snap close is connected with the dropout iron core (11) that is built in the coil (27), the iron core of being threaded off (11) but the effect move left and right;
One end of described dropout iron core (11) is provided with the groove of spill; be used to stretch in the draw-in groove on inverted "L" shaped snap close (23) sidewall; its other end is inserted in the coil (27); and the end is placed with dropout spring (28); two legs of described coil (27) are welded on respectively on the circuit board, are connected with live wire, zero line on the circuit board by leakage current detection protection circuit.
2, the attaching plug with creepage protection function according to claim 1 is characterized in that: described leakage current detection protection circuit is made up of controllable silicon (SCR), diode (D1, D2), electric capacity (C1), resistance (R2, R3), the tripping coil (SOL) that is built-in with iron core;
The control utmost point of controllable silicon (SCR) links to each other with the metal screen layer (L) of power line by a resistance (R2); Simultaneously, tripping coil (SOL) and the live wire (HOT), zero line (WHITE) two ends that are connected in parallel on attaching plug after controllable silicon (SCR), diode (D1) are connected form a controllable silicon (SCR) conducting loop;
Between the control utmost point of controllable silicon (SCR) and negative electrode, be parallel with another resistance (R3) and electric capacity (C1); Between the anode of controlled (SCR) and negative electrode, be parallel with another diode (D2).
3, the attaching plug with creepage protection function according to claim 1 and 2 is characterized in that: also be provided with an analogue test button (6) on described housing; The one end passes housing, and the other end is positioned at the top of the analogue test switch (26) that is welded on the control circuit board; One end of this analogue test switch (26) links to each other with live wire in the plug-in power pack output line by resistance (R4), and the other end links to each other with the screen (L) of plug-in power pack output line.
4, the attaching plug with creepage protection function according to claim 3, it is characterized in that: described leakage current detection protection circuit also comprises a display circuit, this display circuit is made of resistance (R1), light-emitting diode (LED) and diode (D3) series connection, and it is connected in parallel between plug-in power pack output live wire, the zero line;
Also be provided with an indicator lamp hole (12) that can show the light-emitting diode state at described surface of shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620133835 CN200950504Y (en) | 2006-09-20 | 2006-09-20 | Electric power plug having earth leakage protective function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620133835 CN200950504Y (en) | 2006-09-20 | 2006-09-20 | Electric power plug having earth leakage protective function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200950504Y true CN200950504Y (en) | 2007-09-19 |
Family
ID=38893046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620133835 Expired - Lifetime CN200950504Y (en) | 2006-09-20 | 2006-09-20 | Electric power plug having earth leakage protective function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200950504Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010135904A1 (en) * | 2009-05-27 | 2010-12-02 | 中山市开普电器有限公司 | Power plug with leakage protection function |
| CN102420414A (en) * | 2010-09-27 | 2012-04-18 | 通领科技集团有限公司 | High-sensitivity leakage current detection circuit breaker |
| CN101847802B (en) * | 2009-03-23 | 2012-05-23 | 陈华强 | Electric leakage protection plug |
| US8213139B2 (en) | 2008-09-12 | 2012-07-03 | Luen Ming Electric Works Company Limited | Leakage current protection plug and interrupt protection plug contact spring structure |
| CN102904121A (en) * | 2012-06-27 | 2013-01-30 | 钱加灿 | Earth wire earth leakage protection mechanism |
| CN103247884A (en) * | 2013-05-21 | 2013-08-14 | 广州丹兴通信技术有限公司 | Connecting device for compositing power lines with optical fibers |
| CN103682800A (en) * | 2012-09-26 | 2014-03-26 | 珠海格力电器股份有限公司 | Leakage protection plug |
-
2006
- 2006-09-20 CN CN 200620133835 patent/CN200950504Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8213139B2 (en) | 2008-09-12 | 2012-07-03 | Luen Ming Electric Works Company Limited | Leakage current protection plug and interrupt protection plug contact spring structure |
| CN101847802B (en) * | 2009-03-23 | 2012-05-23 | 陈华强 | Electric leakage protection plug |
| WO2010135904A1 (en) * | 2009-05-27 | 2010-12-02 | 中山市开普电器有限公司 | Power plug with leakage protection function |
| CN102420414A (en) * | 2010-09-27 | 2012-04-18 | 通领科技集团有限公司 | High-sensitivity leakage current detection circuit breaker |
| CN102904121A (en) * | 2012-06-27 | 2013-01-30 | 钱加灿 | Earth wire earth leakage protection mechanism |
| CN102904121B (en) * | 2012-06-27 | 2015-09-02 | 钱加灿 | Earth wire earth leakage protection mechanism |
| CN103682800A (en) * | 2012-09-26 | 2014-03-26 | 珠海格力电器股份有限公司 | Leakage protection plug |
| CN103682800B (en) * | 2012-09-26 | 2016-04-13 | 珠海格力电器股份有限公司 | Leakage protecting plug |
| CN103247884A (en) * | 2013-05-21 | 2013-08-14 | 广州丹兴通信技术有限公司 | Connecting device for compositing power lines with optical fibers |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN200965956Y (en) | Electrical leakage protective power supply plug | |
| CN200950504Y (en) | Electric power plug having earth leakage protective function | |
| CN202817403U (en) | Leakage protective plug | |
| CN201185273Y (en) | Power-supply plug with cable earth leakage protection function | |
| CN201657083U (en) | Electronic waterproof protection circuit as well as electronic waterproof terminal | |
| CN203054158U (en) | Arc fault detecting device with working state indicating function | |
| CN203521795U (en) | Power source plug having earth leakage protection function | |
| CN2733662Y (en) | Power plug with leakage protection function | |
| CN101483297B (en) | Electric power plug with leakage protection function | |
| CN102593785B (en) | Protective circuit for electric leakage detection | |
| CN201188535Y (en) | Super lightning protection mobile socket | |
| CN2877101Y (en) | Control circuit with displaying functions of preventing reverse connecting error and state | |
| CN201750009U (en) | Household appliance leakage protection socket | |
| CN201466675U (en) | Leakage detection protection circuit | |
| CN200956048Y (en) | Leakage detecting aircuit | |
| CN201663428U (en) | Automatic power-off type comprehensive protector | |
| CN201887425U (en) | Electricity leakage detection display protection circuit | |
| CN205195233U (en) | Power leakage protector | |
| CN204304126U (en) | Portable overvoltage protection extension socket | |
| CN201422012Y (en) | Leakage detection and protection circuit with end-of-life detection and display function | |
| CN2840400Y (en) | Leakage protection socket service life stop display circuit | |
| CN204391018U (en) | A kind of overvoltage/undervoltage device being applicable to the instruction of miniature circuit breaker accessory tapes voltage | |
| CN2852454Y (en) | End-to-life display circuit of earth leakage protective socket | |
| CN2852457Y (en) | Status display circuit | |
| CN2877102Y (en) | Socket type grounding fault circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070919 |
|
| EXPY | Termination of patent right or utility model |