CN101552158A - Low voltage circuit breaker capable of displaying work states of all circuits directly - Google Patents
Low voltage circuit breaker capable of displaying work states of all circuits directly Download PDFInfo
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- CN101552158A CN101552158A CNA2009100512418A CN200910051241A CN101552158A CN 101552158 A CN101552158 A CN 101552158A CN A2009100512418 A CNA2009100512418 A CN A2009100512418A CN 200910051241 A CN200910051241 A CN 200910051241A CN 101552158 A CN101552158 A CN 101552158A
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Abstract
The invention relates to a low voltage circuit breaker capable of displaying work states of all circuits directly, in which, electroluminescence indicator lamps capable of indicating the working states of the circuits in real time are disposed on the output ends of the switches with releasing mechanisms on the circuit breaker body; the cover cap is made transparent or semitransparent for observing the indicator lamps corresponding to internal circuits, or nontransparent with transparent windows or observation holes disposed on the limited positions of the electroluminescence indicator lamps corresponding to internal circuits. Thereby, the in-time work statuses of the circuits can be displayed directly by the corresponding electroluminescence indicator lamps, thus, the operators can know the general working status and the accurate failure position under abnormal working status directly and reliably, maintain quickly with definite target, The invention avoids the trouble that failures must be searched by instrument, and the unsafe factor of easily judging fault in the existing technologies, is beneficial to ensuring electric system to operate safely, protecting the operators to perform maintenance in safe state, and improving working efficiency.
Description
Technical field
The present invention relates to technical field of relay protection, particularly a kind of low-voltage circuit breaker that can show each polar circuit operating state intuitively.
Background technology
Protective relaying device is a kind of electric protective equipment of developing for the requirement of satisfying safe operation of power system, and the reliability and the security requirement of it and operation power system are closely related.Wherein: fuse is a kind of simple overcurrent protective device that early occurs, because it is simple in structure and practical, so far still be widely used in the not high low-voltage circuit of rapidity requirement and the protection aspect of power consumption equipment, because fuse is to cut off working power in the mode of fusing fuse, so carrying out needs manually to change fuse after the overcurrent protection task and just can resume work at every turn, more time-consuming, can not satisfy the rapidity requirement of some electricity consumption industry; Low-voltage circuit breaker is with the low-voltage electrical protective device of special-purpose overcurrent release mechanism in come out after fuse a kind of, because it utilizes the overcurrent that moment occurs in the circuit to drive overcurrent electromagnet drive tripping mechanism cut-out working power, as long as push to operating grip after fault eliminating or overcurrent disappear in circuit, can make the tripping mechanism connection working power that resets, resume work fast, has very strong practicality, but find in practice, the operating state of low-voltage circuit breaker only on the upper side and is on the lower side put " ON " and " OFF " demonstration of mark respectively in the handle seat by being arranged on handle, neither directly perceived, unshowy yet, and in case overcurrent takes place in the load circuit, the inner tripping operation of circuit breaker, when cutting off working power, operating grip differs and is positioned at exactly surely on the position of indication gate-dividing state " OFF ", so " ON " and " OFF " by both sides about range estimation handle position or the handle judges that the achieved reliability of the residing operating state of circuit breaker is not high, therefore and misoperation causes causing the security incident and the economic loss that are difficult to imagine the user is taken place easily; In recent years, occurred some on the market and working station indicator has been set in case inside, loophole is being set on the handle or on the case, or working station indicator is set directly at the lip-deep low-voltage circuit breaker of case, though have the advantage that shows the low-voltage circuit breaker operating state intuitively, but since show just be equivalent to the overall work state that handle is in " ON " or " OFF ", so just in case break down in the circuit, also need check by the road when overhauling by detecting instrument, find out the concrete occurrence positions of fault, just can carry out the maintenance of fault removing property afterwards, owe concrete so still exist operating state to show, time-consuming during maintenance, effort, the big and high weak point of cost of maintaining workload.In addition, because described working station indicator is arranged on the inboard position of described loophole or on the case surface, working station indicator links to each other with corresponding electric connecting point by lead, in the process of circuit breaker work, in the switch knob course of work no matter conversion or tripping mechanism are opened/closed between " ON " or " OFF ", all can cause the displacement of lead or friction and cause taking place unsafe conditions such as electric short circuit.So; the low-voltage circuit breaker of existing various versions exists structure to owe scientific and reasonable generally; operating state shows imprecise; drawbacks such as the big and cost height of maintenance amount; can not satisfy power industry definitely to fail safe and reliability requirement in rapidity, sensitivity, fail safe and four basic demands of reliability of relaying protection aspect regulation; necessaryly suitably improve from the 26S Proteasome Structure and Function, to satisfy the requirement of safety utilization of electric power and efficient operation.
Summary of the invention
The existing operating state of low-voltage circuit breaker that the objective of the invention is to overcome the existing structure form is judged the unsafe factor of rapidity and poor reliability, provide a kind of in every supply line of base interior, be provided with the relevant work status displays, can be intuitively and show the low-voltage circuit breaker of the instant concrete operating state of each polar circuit reliably.
The low-voltage circuit breaker main body of each polar circuit operating state that can show intuitively of the present invention is made of housing, breaker body and operating state display, is characterised in that: comprise the switch that is provided with multichannel band tripping mechanism on the described breaker body; Be respectively arranged with by electroluminescence indicator light, current-limiting resistor on the switch of described every road tripping mechanism and draw the operating state display that lead series connection constitutes; Described housing is made of pedestal and cover cap, described cover cap both can be provided with and be the nontransparent shape that is provided with printing opacity observation window or inspection hole corresponding to the position of each road electroluminescence indicator light, also can whole be provided with to be the transparence of being convenient to inner each extremely corresponding indicator light operating state directly perceived or translucent; In addition, described electroluminescence indicator light is filled the post of by electricity-saving lamp, and is preferred with neon lamp.
In three utmost point low-voltage circuit breakers of constructing based on above-mentioned design that can show each polar circuit operating state intuitively, comprise on the breaker body and be provided with by A, B, the switch that the C three-phase constitutes with No. three tripping mechanisms, described by the electroluminescence indicator light, current-limiting resistor is provided with two groups with the operating state display of drawing lead series connection formation, be separately positioned on corresponding between phase line A-B and between phase line C-B, two the electroluminescence indicator lights " A " wherein and an end separately of " C " are mounted on A by self leading foot or lead fixed respectively, C two phase lines are positioned on the tripping mechanism of power consumption equipment one side moving contact of breaker side lower end in advance by on the special-purpose weld tabs of adjusting bolt, one end of two current-limiting resistors is drawn foot with another of two electroluminescence indicator lights " A " and " C " respectively and is electrically connected, the other end by self leading foot or lead be mounted on the B phase simultaneously tripping mechanism in advance by on the special-purpose weld tabs of adjusting bolt.During work: in normal operation, the all luminous work of two indicator lights " A " and " C ", and brightness unanimity, when the circuit of arbitrary phase among phase line A or the C occurs that phase shortage opens circuit or during fault, the indicator light of corresponding phase " A " or " C " will extinguish, thereby indication is intuitively informed in this circuitry phase that indicator light extinguishes and had fault; When occurring in the B circuitry phase that phase shortage opens circuit or during fault, described two groups of operating state displays are equivalent to directly be serially connected between the A-C phase line, make and the corresponding mutually indicator light " A " of A, C and " C " obvious dimness, inform in the B phase circuit and have fault thereby can indicate intuitively.
Equally, by A, B, in the four pole low-voltage circuit breaker that C three-phase and center line N constitute, comprise the switch that is provided with three road band tripping mechanisms on the breaker body, described by the electroluminescence indicator light, current-limiting resistor is provided with three groups with the operating state display of drawing lead series connection formation, be separately positioned on corresponding to A-N, between B-N and C-N phase line, three electroluminescence indicator lights " A " wherein, an end separately of " B " and " C " is mounted on A by self leading foot or lead fixed respectively, B, the C three-phase is positioned on the tripping mechanism of power consumption equipment one side moving contact of breaker side lower end in advance by on the special-purpose weld tabs of adjusting bolt, one end of three current-limiting resistors respectively with three electroluminescence indicator lights " A ", another of " B " and " C " drawn foot and is electrically connected, and the other end is arranged in being flexible coupling of center line N simultaneously by self leading foot or lead.During work: in normal operation, three indicator lights " A ", " B " and " C " all luminous work, and brightness unanimity; When arbitrary circuit among phase line A, B or the C occurs that phase shortage opens circuit or during fault, the indicator light of corresponding phase " A ", " B " or " C " will extinguish, then clear and definite the demonstration intuitively informs in this circuitry phase that extinguishes at lamp and has fault.
The low-voltage circuit breaker that can show each polar circuit operating state based on the present invention of above-mentioned design intuitively, owing on each circuitry phase of accepting the low-voltage circuit breaker protection, be provided with the operating state display, show the instant operating state of informing each circuitry phase intuitively by the electroluminescence indicator light in the operating state display, simultaneously on the cover cap position that the position is set corresponding to each phase electroluminescence indicator light spacing, be respectively arranged with printing opacity observation window or inspection hole, perhaps whole setting of cover cap is the transparence of being convenient to have an X-rayed inner each phase indicator light operating state or translucent, it is directly perceived and reliable to make low-voltage circuit breaker of the present invention that the work state information of providing is provided, be convenient to operating personnel's management and guarantee Electrical Safety, can effectively avoid the generation of and misoperation situation disconnected: when circuit breaker is in separating brake " OFF " state such as erroneous judgement in the prior art, phase voltage or line voltage are 0V, the electroluminescence indicator light all is in and extinguishes state, and administrative staff just can declare intuitively and know that circuit breaker is in the separating brake operating state; When circuit breaker was in combined floodgate " ON " power supply state, circuit breaker and external circuit were in on-state, the electroluminescence indicator light all electric shinny, administrative staff just can declare the normal operating conditions of knowing after circuit breaker is in combined floodgate intuitively; When occurring in the circuit that certain phase phase shortage opens circuit or during fault, then corresponding electroluminescence indicator light goes out, or associated indicator light deepening, administrative staff are generation, and the occurrence positions of fault of perception fault intuitively just, be convenient to administrative staff and keep in repair fast with a definite target in view, can effectively avoid such as pursuing the trouble of checking the trouble-shooting origination point mutually by detecting instrument in the prior art; And owing to adopt the display mode directly perceived of electroluminescence indicator light " bright " or " secretly ", be convenient to telemanagement and monitoring in real time, even there is not clearly to judge under the situation of light the instant operating state of the closing of circuit breaker, gate-dividing state and each circuitry phase at night yet, not only help guaranteeing the safe operation of electrical system, carry out maintaining under the state that help also guaranteeing that administrative staff are reliable in information, is perfectly safe and increase work efficiency; In addition, also since working station indicator be fixedly installed on the tripping mechanism of power consumption equipment one side moving contact of breaker side lower end in advance by on the special-purpose weld tabs of adjusting bolt, during work neither can in company with tripping mechanism hold/close the action and the lead that is shifted, rubs, cause unsafe conditions such as electric short circuit, also can not influence bimetal leaf, nut, the normal performance of screw function and the action message of tripping mechanism on the circuit breaker.So, the present invention can show intuitively that the low-voltage circuit breaker of each polar circuit operating state compares with any a low-voltage circuit breaker of the prior art, though on each phase supply terminals of low-voltage circuit breaker body, all increase the operating state display that is provided with charged luminous indicating lamp, on case, increase and be provided with printing opacity observation window or inspection hole, or change case is arranged to transparence or translucent, but general structure is still simpler, cost increases few, the indicating operating status that brings with it is obvious and directly perceived, specifically, failure judgement is quick and reliable, give and use and keep in repair the very big convenience of bringing, can guarantee electricly to compare with the safe and stable operation of work system, more having demonstrated fully its extremely strong practicality and valuable economy, is the desirable renewal product of existing low-voltage circuit breaker.
Description of drawings
Fig. 1 is the basic structure schematic diagram of the embodiment of the invention 1;
Fig. 2 is that the operating state display is electrically connected schematic diagram in the embodiment of the invention 1;
Fig. 3 is the structural representation that adopts nontransparent cover cap in the embodiment of the invention 1;
Fig. 4 is the basic structure schematic diagram of the embodiment of the invention 2;
Fig. 5 is that the operating state display is electrically connected schematic diagram in the embodiment of the invention 2;
Fig. 6 is the structural representation that adopts nontransparent cover cap in the embodiment of the invention 2.
Among the figure:
1. housing 2. breaker bodies 3. operating state displays 4. tripping mechanisms
5. switch 6. electroluminescence indicator lights 7. current-limiting resistors 8. are drawn lead
9. pedestal 10. cover caps, 11. observation windows or inspection hole 12. 3 utmost point low-voltage circuit breakers
13. adjusting bolt 14. special-purpose weld tabs 15. four pole low-voltage circuit breakers 16. is flexible coupling
Embodiment
In Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the low-voltage circuit breaker main body of each polar circuit operating state that can show intuitively of the present invention is made of housing 1, breaker body 2 and operating state display 3, is characterised in that: comprise the switch 5 that is provided with multichannel band tripping mechanism 4 on the described breaker body 2; Be provided with by electroluminescence indicator light 6, current-limiting resistor 7 on described every road tripping mechanism 4 respectively and draw lead 8 series connection and constitute operating state display 3; Described housing 1 includes pedestal 9 and cover cap 10, cover cap 10 setting is the nontransparent shape that the position that each road electroluminescence indicator light 6 is set corresponding to inside is provided with printing opacity observation window or inspection hole 11, also can wholely be provided with to be the transparence of being convenient to inner each extremely corresponding indicator light operating state directly perceived or translucent; In addition, described electroluminescence indicator light 6 is filled the post of by electricity-saving lamp, and is preferred with neon lamp.
At Fig. 1, among Fig. 2 and Fig. 3, in three utmost point low-voltage circuit breakers of constructing based on the present invention 12 that can show each polar circuit operating state intuitively, comprise on the breaker body 1 and be provided with by A, B, the C three-phase constitutes is with No. three tripping mechanism 4-1, the switch 5 of 4-3 and 4-2, described by electroluminescence indicator light 6, current-limiting resistor 7 and draw operating state display 3 that lead 8 series connection constitute and be provided with two groups of 3-1 and 3-2, correspondence is arranged between phase line A-B and between phase line C-B respectively, two electroluminescence indicator lights " A " 6-1 wherein and the end separately of " C " 6-2 are mounted on A by self leading foot or lead fixed respectively, the C two-phase is positioned at the tripping mechanism 4-1 of power consumption equipment one side moving contact of breaker side lower end and 4-2 and goes up in advance by adjusting on the fixing special-purpose weld tabs 14 of bolt 13, the end of two current-limiting resistor 7-1 and 7-2 is electrically connected with another leading foot of two electroluminescence indicator lights " A " 6-1 and " C " 6-2 respectively, and the other end is gone up in advance by adjusting on the fixing special-purpose weld tabs 14 of bolt 13 by self leading foot or the lead tripping mechanism 4-3 that is mounted on the B phase simultaneously.During work: in normal operation, indicator light " A " 6-1 is consistent with indicator light " C " 6-2 brightness; When the arbitrary circuitry phase among phase line A or the C occurs that phase shortage opens circuit or during fault, corresponding indicator light " A " 6-1 or " C " 6-2 will extinguish, thereby indication is intuitively informed in this circuitry phase that extinguishes at indicator light and is had fault; When occurring in the B circuitry phase that phase shortage opens circuit or during fault, described two groups of operating state display 3-1 and 3-2 are equivalent to directly be serially connected between the A-C phase line, make with in the obvious dimness of corresponding mutually indicator light " A " 6-1 of A, C and " C " 6-2, inform in the B circuitry phase and have fault thereby can indicate intuitively.
At Fig. 4, among Fig. 5 and Fig. 6, by A, B, in the four pole low-voltage circuit breaker 15 that C three-phase and center line N constitute, comprise on the breaker body 2 and be provided with three road band tripping mechanism 4-1, the switch 5 of 4-4 and 4-2, described by electroluminescence indicator light 6, current-limiting resistor 7 is provided with 3-1 with the operating state display 3 of drawing lead 8 series connection formations, three groups of 3-3 and 3-2, correspondence is arranged on A-N respectively, between B-N and C-N phase line, three electroluminescence indicator lights " A " 6-1 wherein, the end separately of " B " 6-3 and " C " 6-2 is arranged on A by self leading foot or lead 8 fixed installations respectively, B, the C three-phase is positioned at the tripping mechanism 4-1 of power consumption equipment one side moving contact of breaker side lower end, 4-4 and 4-2 go up in advance by adjusting on the fixing special-purpose weld tabs 14 of bolt 13, three current-limiting resistor 7-1, the end of 7-3 and 7-2 respectively with three electroluminescence indicator lights " A " 6-1, another of " B " 6-3 and " C " 6-2 drawn foot and is electrically connected, and the other end is arranged on being flexible coupling on 16 of center line N simultaneously by self leading foot or lead 8; During work, in normal operation, three indicator lights " A " 6-1, " B " 6-3 are consistent with " C " 6-2 brightness, when arbitrary circuitry phase in the circuit of phase line A, B or C occurs that phase shortage opens circuit or during fault, electroluminescence indicator light " A " 6-1, " B " 6-3 of corresponding phase or will extinguishing of " C " 6-2, then clear and definite demonstration is intuitively informed in this circuitry phase that extinguishes at indicator light 6 and is had fault.
Claims (8)
1. the low-voltage circuit breaker that can show each polar circuit operating state intuitively is made of housing (1), breaker body (2) and operating state display (3), it is characterized in that:
A. comprise the switch (5) that is provided with multichannel band tripping mechanism (4) on the described breaker body (2);
B. be provided with by electroluminescence indicator light (6), current-limiting resistor (7) on described every road tripping mechanism (4) respectively and draw lead (8) series connection and constitute operating state display (3);
C. described housing (1) includes pedestal (9) and cover cap (10), the whole setting of described cover cap (10) is transparence or translucent, and perhaps the corresponding position, position that each phase electroluminescence indicator light (6) is set corresponding to positioned internal is provided with the nontransparent shape of printing opacity observation window or inspection hole (11).
2. the low-voltage circuit breaker that can show each polar circuit operating state intuitively according to claim 1 is characterized in that described electroluminescence indicator light (6) filled the post of by electricity-saving lamp, and is preferential with neon lamp.
3. the low-voltage circuit breaker that can show each polar circuit operating state intuitively according to claim 1 is characterized in that described by electroluminescence indicator light (6), current-limiting resistor (7) with draw operating state display (3) that lead (8) series connection constitutes be provided with (3-1) and (3-2) two groups in three utmost point low-voltage circuit breakers (1 2) that are made of A, B, C three-phase.
4. the low-voltage circuit breaker that can show each polar circuit operating state intuitively according to claim 3, it is characterized in that described two groups of operating state displays (3-1) and (3-2), be separately positioned between phase line A-B and between phase line C-B, two electroluminescence indicator lights " A " wherein (6-1) are arranged on A by self leading foot or lead (8) fixed installation respectively with " C " end separately (6-2), the C two-phase be positioned at the tripping mechanism (4-1) of power consumption equipment one side moving contact of breaker side lower end and (4-2) in advance by adjusting on the fixing special-purpose weld tabs (14) of bolt (13), two current-limiting resistors (7-1) and an end (7-2) respectively with two electroluminescence indicator lights " A " (6-1) and " C " another leading foot (6-2) be electrically connected, the other end by self leading foot or lead (8) be mounted on the B phase simultaneously tripping mechanism (4-3) in advance by adjusting on the special-purpose weld tabs (14) that bolt (13) fixes.
5. the low-voltage circuit breaker that can show each polar circuit operating state intuitively according to claim 3, when it is characterized in that described three utmost point low-voltage circuit breakers (12) are worked: in normal operation, (6-1) (6-2) brightness is consistent with indicator light " C " for indicator light " A ", when occurring in arbitrary circuitry phase of phase line A or C that phase shortage opens circuit or during fault, the indicator light of corresponding phase " A " (6-1) or " C " (6-2) will extinguish, thereby indication is informed in this circuitry phase that extinguishes at indicator light and is had fault intuitively; When occurring in the B circuitry phase that phase shortage opens circuit or during fault, described two groups of operating state displays (3-1) and (3-2) be equivalent to directly be serially connected between the A-C phase line, make with A, C corresponding indicator light " A " mutually (6-1) and " C " (6-2) obvious dimness, inform in the B circuitry phase and have fault thereby can indicate intuitively.
6. the low-voltage circuit breaker that can show each polar circuit operating state intuitively according to claim 1 is characterized in that by electroluminescence indicator light (6), current-limiting resistor (7) and draws operating state display (3) that lead (8) series connection constitutes being provided with three groups (3-1), (3-2) and (3-3) in the four pole low-voltage circuit breaker (15) that is made of A, B and C three-phase and center line N.
7. the low-voltage circuit breaker that can show each polar circuit operating state intuitively according to claim 6, it is characterized in that described three groups of operating state displays (3-1), (3-3) He (3-2) be separately positioned on corresponding to A-N, between B-N and C-N phase line, three electroluminescence indicator lights " A " wherein (6-1), " B " (6-3) is arranged on A by self leading foot or lead (8) fixed installation respectively with " C " end separately (6-2), B, the C three-phase is positioned at the tripping mechanism (4-1) of power consumption equipment one side moving contact of breaker side lower end, (4-4) and (4-2) in advance by adjusting on the fixing special-purpose weld tabs (14) of bolt (13), three current-limiting resistors (7-1), an end (7-3) and (7-2) respectively with three electroluminescence indicator lights " A " (6-1), " B " (6-3) and " C " (6-2) another draw foot and be electrically connected, the other end by self leading foot or lead (8) be arranged on center line N simultaneously be flexible coupling (16) on.
8. the low-voltage circuit breaker that can show each polar circuit operating state intuitively according to claim 6, it is characterized in that described four pole low-voltage circuit breaker (15) in normal operation, three indicator lights " A " (6-1), " B " (6-3) (6-2) brightness is consistent with " C ", when arbitrary circuitry phase in the circuit of phase line A, B or C occurs that phase shortage opens circuit or during fault, corresponding electroluminescence indicator light " A " (6-1), " B " (6-3) or " C " will extinguish (6-2), then clear and definite the demonstration intuitively informs in this circuitry phase that indicator light (6) extinguishes and has fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100512418A CN101552158A (en) | 2009-05-14 | 2009-05-14 | Low voltage circuit breaker capable of displaying work states of all circuits directly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100512418A CN101552158A (en) | 2009-05-14 | 2009-05-14 | Low voltage circuit breaker capable of displaying work states of all circuits directly |
Publications (1)
| Publication Number | Publication Date |
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| CN101552158A true CN101552158A (en) | 2009-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100512418A Pending CN101552158A (en) | 2009-05-14 | 2009-05-14 | Low voltage circuit breaker capable of displaying work states of all circuits directly |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983044A (en) * | 2011-09-05 | 2013-03-20 | 施耐德电器工业公司 | Electrification state indicating device of circuit breaker and circuit breaker with same |
| CN104076238A (en) * | 2014-06-25 | 2014-10-01 | 国家电网公司 | Night low-voltage fault detection visual device of distribution transformer |
| CN107230596A (en) * | 2017-07-14 | 2017-10-03 | 德力西电气有限公司 | A kind of operating unit of RCCB |
| CN107622905A (en) * | 2017-08-21 | 2018-01-23 | 安徽省颍上县正泰电器有限责任公司 | A kind of breaker structure |
-
2009
- 2009-05-14 CN CNA2009100512418A patent/CN101552158A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983044A (en) * | 2011-09-05 | 2013-03-20 | 施耐德电器工业公司 | Electrification state indicating device of circuit breaker and circuit breaker with same |
| CN104076238A (en) * | 2014-06-25 | 2014-10-01 | 国家电网公司 | Night low-voltage fault detection visual device of distribution transformer |
| CN107230596A (en) * | 2017-07-14 | 2017-10-03 | 德力西电气有限公司 | A kind of operating unit of RCCB |
| CN107230596B (en) * | 2017-07-14 | 2019-11-12 | 德力西电气有限公司 | A kind of operating unit of leakage circuit breakers |
| CN107622905A (en) * | 2017-08-21 | 2018-01-23 | 安徽省颍上县正泰电器有限责任公司 | A kind of breaker structure |
| CN107622905B (en) * | 2017-08-21 | 2019-04-19 | 安徽省颍上县正泰电器有限责任公司 | A kind of breaker structure |
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Open date: 20091007 |