CN203277240U - Plastic casing type circuit breaker - Google Patents
Plastic casing type circuit breaker Download PDFInfo
- Publication number
- CN203277240U CN203277240U CN 201320274518 CN201320274518U CN203277240U CN 203277240 U CN203277240 U CN 203277240U CN 201320274518 CN201320274518 CN 201320274518 CN 201320274518 U CN201320274518 U CN 201320274518U CN 203277240 U CN203277240 U CN 203277240U
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- CN
- China
- Prior art keywords
- circuit breaker
- contact head
- switch mechanism
- movable switch
- base
- 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 - Fee Related
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Abstract
The utility model discloses a plastic casing type circuit breaker which comprises a casing, a fixed contact, a movable switch mechanism and a releasing mechanism. The casing comprises a base and a panel. The fixed contact, the movable switch mechanism and the releasing mechanism are fixed in the base through bolts. The bolts go in from the outside of the base and fix the mechanisms. The positions, which are exposed out of the base, of the bolts are covered by an insulation back plate. According to the utility model, components in the circuit breaker can be stably and reliably fixed in the base; when an arc is generated in the circuit breaker, the insulation back plate can prevent the arc from being guided to the outside of the casing through the bolts; and the work safety of the circuit breaker is ensured.
Description
Technical field
The utility model relates to a kind of electrical switchgear, relates in particular to a kind of moulded case circuit breaker.
Background technology
Circuit breaker refers to close and closes, carries and cut-off electric current under normal loop condition, and can close close, in the in setting time carrying with cut-off the switching device of the electric current under abnormal loop condition (comprising short circuit condition).Circuit breaker can be used to distribute electric energy; do not start continually asynchronous motor; power circuit and motor etc. are carried out protection, can automatic shutdown circuit when serious overload or short circuit and the fault such as under-voltage occur for their, its function is equivalent to Fuse switch and the combination of crossing underheat relay etc.And generally do not need to change parts after the disjunction fault current.
Existing circuit breaker mainly by shell, be located at contact assembly in shell, drive the transmission component of contact assembly, driven unit and the arc-extinguish chamber of controlling transmission component forms.For good insulation, above-mentioned parts are fixed in the base of described shell by the plastic nut of bolt and enclosure, owing to being provided with movable device in circuit breaker, and it can produce because of electric arc moment high temperature when work, this fixed form can cause element loosening in long-term the use because plastic nut is aging, even come off, affect the working stability of circuit breaker.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of moulded case circuit breaker is provided, can guarantees that its inner member can not produce because of movable and high arc temperature repeatedly loosening, and the electric arc that produces can effectively completely cut off connecting and disconnecting of the circuit the time, and compact conformation, working stability.
In order to solve the problems of the technologies described above, the utility model provides a kind of moulded case circuit breaker, comprises
Shell;
Fixing contact head, it is fixedly arranged in described shell and part is stretched out described shell;
Movable switch mechanism, it contacts with described fixedly contact head and separates, thus the break-make of control load electric current;
Tripping mechanism, it is located in described shell, when described load current during more than or equal to rated value, discharges the locking to described movable switch mechanism, and described movable switch mechanism is separated with described fixedly contact head;
Described shell comprises base and panel, described fixedly contact head, movable switch mechanism and tripping mechanism all are bolted in described base, described bolt passes into and fixing said mechanism from described base exterior, and described bolt exposes described base position and is insulated backboard and covers.
As the improvement of such scheme, the whole back side of the described base of described insulating back panel nearly cover.
As the improvement of such scheme, described fixedly contact head is 3 to 4 groups of separate contact heads, every group of described insulation board that fixedly is equipped with between contact head.
Improvement as such scheme, described movable switch mechanism comprises movable contact head, described movable contact head is provided with for when described movable switch mechanism and the described fixedly holddown spring that described movable contact head and described fixedly contact head is close to when contact head contacts, and it is located in the rotating shaft of described movable switch mechanism.
As the improvement of such scheme, the thrust of described holddown spring is 18-20N.
As the improvement of such scheme, the specification of described movable contact head is 7mm * 5.5mm * 2mm.
As the improvement of such scheme, described circuit breaker also comprise be located in described shell, the arc-extinguish chamber of described movable switch mechanism top.
As the improvement of such scheme, described movable switch mechanism also comprises hand switch, and described hand switch is provided with the handle that part is stretched out described shell; Described handle can be by driving that described hand switch is stirred up and down and the contact of manually controlling described movable switch mechanism and described fixedly contact head with separate.
Implement the utility model, have following beneficial effect:
In circuit breaker described in the utility model, described shell comprises base and panel, described fixedly contact head, movable switch mechanism and tripping mechanism all are bolted in described base, described bolt passes into and fixing said mechanism from described base exterior, and described bolt exposes described base position and is insulated backboard and covers.The element of described circuit breaker inside is stablized and is fixed in reliably in described base, and when the inner generation of described circuit breaker electric arc, described insulating back panel can prevent that electric arc from arriving housing exterior by bolt guide, ensures the work safety of circuit breaker.
For worse operational environment, the insulating back panel described in the utility model can extend to the back side of whole base substantially, prevents that electric arc from overflowing from the gap of insulating back panel and base.
Description of drawings
Fig. 1 is the cutaway view of a kind of moulded case circuit breaker the first embodiment of the utility model;
Fig. 2 is the cutaway view of a kind of moulded case circuit breaker the second embodiment of the utility model;
Fig. 3 is the phantom of a kind of moulded case circuit breaker of the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in the phantom of the cutaway view of moulded case circuit breaker the first embodiment as a kind of in Fig. 1 the utility model and a kind of moulded case circuit breaker of Fig. 3 the utility model, the utility model the first embodiment, a kind of moulded case circuit breaker comprises
Fixedly contact head 2, and it is fixedly arranged in described shell 1 and part is stretched out described shell 1;
Described shell 1 comprises base 5 and panel 6, described fixedly contact head 2, movable switch mechanism 3 and tripping mechanism 4 all are bolted in described base 5, described bolt passes into from described base 5 outsides and fixing said mechanism, and described bolt exposes described base 5 places and is insulated backboard 7 and covers.
Need to prove, described circuit breaker inner member is fixed in described base 5 by the bolt that passes into from described shell 1 outside, make the element of described circuit breaker inside stable and be fixed in reliably in described base 5, when the inner generation of described circuit breaker electric arc, described insulating back panel 7 can prevent that electric arc from arriving shell 1 outside by bolt guide, ensures the work safety of circuit breaker.
As shown in the cutaway view of moulded case circuit breaker the second embodiment as a kind of in Fig. 2 the utility model, the utility model the second embodiment is with the first embodiment difference, the whole back side of the described insulating back panel 7 described bases 5 of nearly cover.
Need to prove, the present embodiment is for worse operational environment, place as more in dust or moister zone etc., and described insulating back panel 7 can extend to the back side of whole base 5 substantially, prevents that electric arc from overflowing from the gap of insulating back panel 7 and base 5.
According to the utility model embodiment, described fixedly contact head 2 is 3 to 4 groups of separate contact heads, is equipped with insulation board 8 between every group of described fixedly contact head 2.
Need to prove, the effect of described insulation board 8 is to prevent described fixedly contact head 2 because space length is pressed close to, and produces short circuiting arc, and causing fixedly, contact head 2 burns.
Wherein, described movable switch mechanism 3 comprises movable contact head 9, described movable contact head 9 is provided with the holddown spring 10 that described movable contact head 9 and described fixedly contact head 2 is close to for when described movable switch mechanism 3 contacts with described fixedly contact head 2, and it is located in the rotating shaft of described movable switch mechanism 3.
Need to prove, described circuit breaker is in long-term use procedure, described movable contact head 9 can produce diastema with described fixedly contact head 2 because of wearing and tearing, finally cause loose contact, the described holddown spring 10 described movable contact heads 9 of assurance are close to described fixedly contact head 2 when "on" position all the time, have improved the reliability of described circuit breaker.
Preferably, the thrust of described holddown spring 10 is 18-20N.
Need to prove, the selected pressing force of the spring of the utility model embodiment is for specified 200A-400A current design.Described holddown spring 10 provides thrust with described fixedly contact head 2 for described movable contact head 9, when described thrust is too small, described movable contact head 9 and described fixedly contact head 2 can't be close to fully, cause area of passage not enough, and contact-making surface heating rapidly also may burn; When described thrust is excessive, the circuit breaker disjunction with break-time, the especially short circuit that reduces described circuit breaker causes will cause the circuit or the electrical damage that cause because disjunction is untimely.
Preferably, the specification of described movable contact head 9 is 7mm * 5.5mm * 2mm(length * wide * thickness).
Preferably, described circuit breaker also comprise be located in described shell 1, the arc-extinguish chamber 11 of described movable switch mechanism 3 tops.
Need to prove, described arc-extinguish chamber 11 can be accelerated the arc extinction that contact produces, and ensures that described circuit breaker inner member is not burnt by electric arc.
Preferably, described movable switch mechanism 3 also comprises hand switch 12, and described hand switch 12 is provided with the handle 13 that part is stretched out described shell 1; Described handle 13 can be by driving that described hand switch 12 is stirred up and down and the contact of manually controlling described movable switch mechanism 3 and described fixedly contact head 2 with separate.
Need to prove, described hand switch 12 make the operator can be by stirring described hand switch 12 disjunction or the load of connecting described circuit breaker, when needs close described circuit breaker, can manually will be allocated to closing position on described handle 13; When needs cut off described circuit breaker, can be manually that the hand switch 12 that is in closing position is drop-down, it is in opens a sluice gate the position.
Above disclosed is only a kind of preferred embodiment of the utility model, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (8)
1. a moulded case circuit breaker, comprise
Shell;
Fixing contact head, it is fixedly arranged in described shell and part is stretched out described shell;
Movable switch mechanism, it contacts with described fixedly contact head and separates, thus the break-make of control load electric current;
Tripping mechanism, it is located in described shell, when described load current during more than or equal to rated value, discharges the locking to described movable switch mechanism, and described movable switch mechanism is separated with described fixedly contact head;
It is characterized in that, described shell comprises base and panel, described fixedly contact head, movable switch mechanism and tripping mechanism all are bolted in described base, and described bolt passes into and fixing said mechanism from described base exterior, and described bolt exposes described base position and is insulated backboard and covers.
2. circuit breaker as claimed in claim 1, is characterized in that, the whole back side of the described base of described insulating back panel nearly cover.
3. circuit breaker as claimed in claim 1, is characterized in that, described fixedly contact head is 3 to 4 groups of separate contact heads, every group of described insulation board that fixedly is equipped with between contact head.
4. circuit breaker as claimed in claim 1, it is characterized in that, described movable switch mechanism comprises movable contact head, described movable contact head is provided with for when described movable switch mechanism and the described fixedly holddown spring that described movable contact head and described fixedly contact head is close to when contact head contacts, and it is located in the rotating shaft of described movable switch mechanism.
5. circuit breaker as claimed in claim 4, is characterized in that, the thrust of described holddown spring is 18-20N.
6. circuit breaker as claimed in claim 4, is characterized in that, the specification of described movable contact head is 7mm * 5.5mm * 2mm.
7. circuit breaker as claimed in claim 1, is characterized in that, described circuit breaker also comprise be located in described shell, the arc-extinguish chamber of described movable switch mechanism top.
8. circuit breaker as claimed in claim 1, is characterized in that, described movable switch mechanism also comprises hand switch, and described hand switch is provided with the handle that part is stretched out described shell; Described handle can be by driving that described hand switch is stirred up and down and the contact of manually controlling described movable switch mechanism and described fixedly contact head with separate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320274518 CN203277240U (en) | 2013-05-20 | 2013-05-20 | Plastic casing type circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320274518 CN203277240U (en) | 2013-05-20 | 2013-05-20 | Plastic casing type circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203277240U true CN203277240U (en) | 2013-11-06 |
Family
ID=49507596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320274518 Expired - Fee Related CN203277240U (en) | 2013-05-20 | 2013-05-20 | Plastic casing type circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203277240U (en) |
-
2013
- 2013-05-20 CN CN 201320274518 patent/CN203277240U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20170520 |