CN203456402U - Mini circuit breaker - Google Patents

Mini circuit breaker Download PDF

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Publication number
CN203456402U
CN203456402U CN201320604680.9U CN201320604680U CN203456402U CN 203456402 U CN203456402 U CN 203456402U CN 201320604680 U CN201320604680 U CN 201320604680U CN 203456402 U CN203456402 U CN 203456402U
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CN
China
Prior art keywords
iron core
circuit breaker
coil
moving iron
miniature circuit
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.)
Withdrawn - After Issue
Application number
CN201320604680.9U
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Chinese (zh)
Inventor
刘振忠
马思韬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric SE
Schneider Electric Industries SAS
Original Assignee
Schneider Electric SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schneider Electric SE filed Critical Schneider Electric SE
Priority to CN201320604680.9U priority Critical patent/CN203456402U/en
Application granted granted Critical
Publication of CN203456402U publication Critical patent/CN203456402U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides a mini circuit breaker. The mini circuit breaker comprises a first moving iron core, a first coil, a bimetallic strip, and a second coil which is arranged around the first moving iron core and has a wiring terminal electrically connected to a neutral pole of the mini circuit breaker. The bimetallic strip changes its form to connect another wiring terminal of the second coil to a load terminal of the mini circuit breaker electrically, and the electromagnetic field generated by the second coil drives the first moving iron core to move to break the mini circuit breaker. The mini circuit breaker can further comprise a second moving iron core arranged along the same direction of the first moving iron core and being able to move relative to the first moving iron core, and a driven member electrically connected to the load terminal of the mini circuit breaker. When the second moving iron core moves under the force of the electromagnetic field generated by the first coil, the second moving iron core drives the driven member to move; and furthermore, a part of the driven member connects the said other wiring terminal of the second coil to the load terminal of the mini circuit breaker electrically.

Description

Miniature circuit breaker
Technical field
The utility model relates to a kind of miniature circuit breaker.
Background technology
Circuit breaker is for connecting with breaking current and circuit and equipment being provided the overcurrent in the situation that a kind of low-voltage electrical apparatus of protection, is an important factor of the required consideration of design engineer as its cost of civilian miniature circuit breaker (MCB).Existing miniature circuit breaker is the structure of unicoil, single action iron core normally, thereby its scope of application is single and limitation.The MCB of existing concept has almost accomplished the limit to the optimization of its structure and material, only has and breaks through traditional structure, just likely designs low cost, high-quality, high performance circuit breaker.
Utility model content
The utility model provides a kind of new MCB structure, and it can realize the open circuit protection under overload situations with simple structure, and can also further realize the open circuit protection in small short-circuit current situation.
The utility model provides a kind of miniature circuit breaker, comprising: the first moving iron core, is fixedly connected with the moving contact of miniature circuit breaker; The first coil, around the first moving iron core setting; Bimetal leaf, itself and the first coil are connected in series between the load end and moving contact of miniature circuit breaker; It is characterized in that, miniature circuit breaker also comprises: the second coil, is electrically connected to the neutral pole of miniature circuit breaker around the first moving iron core setting and an one terminals; Wherein, while having overload current to flow through in bimetal leaf, bi-metal plate deformed is also electrically connected to another terminals of the second coil with the load end of miniature circuit breaker, and the electromagnetic field that the second coil produces impels first moving iron core motion so that miniature circuit breaker is disconnected.
Further, this miniature circuit breaker also comprises:
The second moving iron core, along moving the orientation setting that iron core is identical and can move with respect to the first moving iron core with first; Driven member, is electrically connected to the load end of miniature circuit breaker; Wherein, each is set to the first coil and the second coil around the first moving iron core and the second moving iron core, wherein, while moving under the electromagnetic field effect that the second moving iron core produces at the first coil, the second moving iron core is actuated described driven member, and then a part for described driven member is electrically connected to another terminals of the second coil with the load end of miniature circuit breaker.
Further, driven member comprises lever, this lever energy is described another terminals rotation towards the second coil around pivotal point under the effect of bimetal leaf or the second moving iron core, and the movable end of this lever or mid portion are electrically connected to another terminals of the second coil with the load end of miniature circuit breaker.
Further, driven member comprises trolley pole, the two ends of this trolley pole are fixed with respect to miniature circuit breaker housing, and the mid portion of this trolley pole can be under the effect of bimetal leaf or the second moving iron core towards described another terminals deflection of the second coil, so that another terminals of the second coil are electrically connected to the load end of miniature circuit breaker.
Further, driven member comprises: lever, its can be under the effect of bimetal leaf or the second moving iron core around the first pivotal point described another terminals pivotable towards the second coil, so that another terminals of the second coil are electrically connected to the load end of miniature circuit breaker; Power connecting sheet, its can be under the effect of the described lever of bimetal leaf or rotation around the second pivotal point described another terminals pivotable towards the second coil, so that another terminals of the second coil are electrically connected to the load end of miniature circuit breaker.
Further, first moves iron core is hollow cylinder and has along the longitudinal direction cavity, and the second moving iron core can be arranged in the described cavity of the first moving iron core with longitudinal sliding.
Further, the cylinder that the first moving iron core is parallel adjacent setting with the second moving iron core.
Further, when flowing through 2-15 times that the electric current of the first coil is rated current, the electromagnetic field that the first coil produces makes the second moving iron core actuate described driven member.
Further, when flow through the electric current of the first coil be limit breaking current 60% or when larger, the electromagnetic field that the first coil produces makes the first moving iron core motion and miniature circuit breaker is disconnected.
MCB of the present utility model can realize overload protection, small short-circuit current protection, large short circuit current protection, and it is simple in structure, part is few, cost is low, can be applicable to flexibly many different circuit protection occasions.
Accompanying drawing explanation
Figure 1A and 1B are according to the structural representation of the miniature circuit breaker of the utility model one preferred embodiment;
Fig. 1 C is the schematic winding diagram of the second coil B;
Fig. 2 is according to the structural representation of the miniature circuit breaker of the utility model one preferred embodiment, has wherein been incorporated to the second moving iron core;
Fig. 3 A-3C is the schematic diagram of miniature circuit breaker of the present utility model while realizing overload protection;
Fig. 4 A-4C is that miniature circuit breaker of the present utility model is realized the small short-circuit current schematic diagram in when protection;
Fig. 5 changes the structural representation of routine miniature circuit breaker according to the utility model one;
Fig. 6 A-6C is for according to the utility model, another changes the structural representation of routine miniature circuit breaker;
Embodiment
The term hereinafter using " on ", D score, " left side ", " right side " set with reference to accompanying drawing drawing, is only for convenience but not to restriction of the present utility model.
Miniature circuit breaker of the present utility model (MCB) provides a kind of new structure of cut-offfing.Referring to Figure 1A, MCB of the present utility model comprises: moving contact M; Fixed contact S: the first moving iron core C, it is fixedly connected with moving contact M; The first loop A, around the first moving iron core C, arrange, terminals of the first loop A are electrically connected to moving contact M and another terminals are electrically connected to the load end of MCB, and this first coil as instantaneous trip coil, for example, is connected in the major loop of MCB by wire pigtail; Bimetal leaf Bi, its one end movably and is for example electrically connected to the first loop A by line pigtail, and the other end of bimetal leaf Bi is also electrically connected to the load end of MCB, thus bimetal leaf Bi is connected in series in the first loop A between the load end and moving contact M of MCB; The second coil B, an one terminals are electrically connected to the neutral line N of MCB, this second coil also has another terminals B1(that can be electrically connected to load end and vide infra), this second coil B also arranges around the first moving iron core C.Although the second coil B is arranged on the top of the first loop A in the embodiment shown, the second coil B also can be arranged on the below of the first loop A.The winding diagram of the second coil B as shown in Figure 1 C.
Under "on" position, moving contact M for example, contacts with fixed contact S by biasing device (acting on the spring on moving iron core), thereby forms contact pressure F0.
Owing to being provided with bimetal leaf Bi, MCB of the present utility model can realize overload protection with simple structure.Specifically, while having overload current to flow through in bimetal leaf Bi, bimetal leaf Bi will generate heat and be out of shape, and then its movable end motion (upwards rotating), as shown in Figure 1B, to be further connected to the terminals B1 of the second coil B, the second coil B is electrically connected to the load end of MCB.Now, in the second coil B, produce huge electromagnetic field, thereby overcome contact pressure F0, to drive the first moving iron core C and to drive moving contact M to move upward, realize the disconnection (referring to Figure 1B) of MCB.
MCB of the present utility model can also further realize by being incorporated to one second moving iron core the open circuit protection in the small short-circuit current situation of certain limit.
Referring to Fig. 2, the moving iron core C of first in above-described embodiment is further arranged to have along the longitudinal direction to the hollow cylinder of cavity.MCB further comprises the second moving iron core D, and it is along moving the orientation setting that iron core C is identical and can move with respect to the first moving iron core C with first.In this embodiment, the second moving iron core D can be arranged in the cavity of the first moving iron core C with longitudinal sliding, and the second moving iron core D can be also cylinder.The movement travel of the second moving iron core D upper end can need to arrange or regulate according to circuit breaker design.The first loop A and the second coil B all arrange around the first moving iron core C and the second moving iron core D, as shown in the figure.
MCB of the present utility model also comprises: lever L, and it can for example, around pivot points P 1 rotation (rotating around the pivot points P 1 that is fixed to Shell of circuit breaker in one end of lever L); Electric connecting plate T, they can for example, around pivot points P 2 rotations (one end of electric connecting plate T be around pivot points P 2 rotations that are fixed to Shell of circuit breaker), and this electric connecting plate is also electrically connected to (for example by line pigtail, being electrically connected to load end) with the load end of MCB.
In the embodiment shown in Fig. 3 A, under overload situations, lever L, bimetal leaf Bi and power connecting sheet T link.Specifically, the movable end of lever L is arranged between the movable end of bimetal leaf Bi and the movable end of electric connecting plate T, be the movable end motion that the movable end of bimetal leaf Bi first promotes lever L, and then the movable end of moving lever L promotes electric connecting plate T rotation, thereby will connect the terminals B1 of the second coil B.
Lever L is also set to be promoted by the upper end of the second moving iron core D.Referring to Fig. 4 A, in the situation that small short-circuit current flows through the first loop A, the second moving iron core D moves upward under the effect of the electromagnetic field of the first loop A, the upper end of the second moving iron core D by contact and promote lever L around pivot points P 1 towards the terminals B1 of the second coil rotation, thereby the movable end of lever L or other parts being actuated also will promote electric connecting plate T, rotate.Thereby electric connecting plate T rotation and its movable end are electrically connected to the terminals B1 of the second coil B with the load end of MCB, so that the second coil B energising.
Certainly said structure is not restrictive, and for example bimetal leaf Bi and lever L can be set to actuate separately respectively power connecting sheet T, and need not to be linkage structure as above.
Although not shown, but under the normal operating conditions of MCB, the second moving iron core D can keep separated with lever L at suitable biasing device (not shown) or by conduct oneself with dignity (in the situation that it is vertically installed), and the biasing force of this biasing device or its deadweight also can need to arrange or regulate according to circuit breaker design.
In addition, although not shown, but lever L and power connecting sheet T can have resetting means independent or that integrate, when breaker closing and normal operation, resetting means arranges and remains on the position of the second coil B not being connected shown in Fig. 2 by lever L and power connecting sheet T.Resetting means can be realized by any suitable mechanism or device, for example, be respectively lever L and power connecting sheet T arranges biasing spring.
In addition, although not shown, but circuit breaker of the present utility model can also comprise the holding device for power connecting sheet T and/or lever L,, after the second coil B connects and make moving contact M and fixed contact S to disconnect, keep power connecting sheet T and/or lever L in the position that the second coil B is connected.
The working condition of MCB of the present utility model in overload, small short-circuit current, large short circuit current situation will be introduced below.
Thereby cut-offfing by connecting the second coil B during overload drives the first moving iron core C to realize.Specifically, bimetal leaf Bi is out of shape upturned because overload current generates heat, its movable end promotes lever L around pivot points P 1 rotation, lever L and then promotion power connecting sheet T are around the pivot points P rotation of the terminals B1 towards the second coil B (referring to Fig. 3 A) in 2 o'clock, the terminals B1 of the second coil B is electrically connected to the load end of MCB.The huge electromagnetic field that has electric current to flow through and produce in the second coil B, this electromagnetic field impels the first moving iron core C overcome the contact pressure F0 on moving contact M and move, thereby the first moving iron core C drives moving contact M to move upward, and realizes the disconnection (referring to Fig. 3 B and 3C) of MCB.
Cut-offfing by the first loop A during small short-circuit current drives the second moving iron core D then to connect the second coil B and drives the first moving iron core C to realize.Specifically, the 2-15 that is greater than rated current when short circuit current is doubly for example, when (10 times), the electromagnetic field producing in the first loop A the moving iron core D of drivings second is moved upward in the first moving iron core C (referring to Fig. 4 A) move.The upper end of the second moving iron core D promotes lever L around 1 rotation of pivot points P, thereby promotes power connecting sheet T around the pivot points P rotation of the terminals B1 towards the second coil B in 2 o'clock, to connect the second coil B.The huge electromagnetic field that the second coil B produces drives the first moving iron core C and drives moving contact M to move upward, and realizes the disconnection (referring to Fig. 4 B and 4C) of MCB.
Cut-offfing by the first loop A during large short circuit current directly drives the first moving iron core C to realize.When short circuit current reach capacity breaking current value 60% or when larger, the huge electromagnetic field that the first loop A produces directly drives the first moving iron core C and drives moving contact M to move upward, realize the disconnection of MCB, state after disconnection not shown in figures but with the state class of Fig. 4 C seemingly.
Other change example
In following variation example, same as the previously described embodiments or similar structure or parts are marked by identical Reference numeral and the descriptions thereof are omitted.Below specifically describe structure or the parts different from above-described embodiment.
MCB of the present utility model also can adopt a kind of simplified structure, is about to lever L and power connecting sheet T and is integrated into parts.Referring to Fig. 5, lever LT is set, it is can be around pivot points P 2 lever rotation, that extend to the right from pivot points P 2.Under the actuating of bimetal leaf Bi or the second moving iron core D, around pivot points P 2, the terminals B1 towards the second coil B rotates this lever LT, thereby the mid portion of lever LT can be electrically connected to the terminals B1 of the second coil B with the load end of MCB, thereby make the second coil B energising.Certainly lever LT can be also can be around pivot points P 1 lever (not shown) rotation, that extend left from pivot points P 1, be that lever LT can be set to, under the actuating of bimetal leaf Bi or the second moving iron core D, around pivot points P 1, the terminals B1 towards the second coil B rotates for it, thereby a movable end of lever is electrically connected to the terminals B1 of the second coil B with the load end of MCB, thereby make the second coil B energising.
MCB of the present utility model also can adopt another kind of structure.One trolley pole R is set, replaces lever L and the power connecting sheet T of above-described embodiment.As shown in Fig. 6 A-C, the two ends of this trolley pole R are fixed with respect to the housing of MCB, and intermediate portion can also contact with it towards the terminals B1 of the second coil B deflection under the effect of bimetal leaf Bi or the second moving iron core D, thereby make the second coil B energising.Fig. 6 B and 6C show respectively the situation of trolley pole R deflection under the effect of bimetal leaf Bi and the second moving iron core D.
In scope of the present utility model, also can make many other settings or modification to the concrete structure of MCB and parts.
For example, the concrete shape of lever L, power connecting sheet T, bimetal leaf Bi, lever LT, trolley pole R, size, material can design arbitrarily as required, as long as they can bring into play corresponding function.For example, the shape of lever L, power connecting sheet T, bimetal leaf Bi, lever LT etc. can be straight also can make bent stick shape.
The condition that the second moving iron core D is actuated and the on-condition of the second coil B can be according to the relevant respective design that needs of the specification of MCB and application circuit.Such as the relevant parameter of stroke, loop A and the B of the biasing force by regulating the second moving iron core D to be subject to, the second moving iron core D upper end etc., miniature circuit breaker of the present utility model can be applicable to overload, the short-circuit protection requirement of various circuit neatly.
Although the second moving iron core D is arranged in the hollow cavity of the first moving iron core C in accompanying drawing illustrated embodiment, but in other embodiments, the first and second moving iron core C, D also can divide and be arranged, and for example adjacent one another arely be arranged in parallel and are surrounded by first, second loop A, B.As long as the second moving iron core D is along moving the orientation setting that iron core C is identical and can move with respect to the first moving iron core C with first.
MCB of the present utility model can realize the open circuit protection in overload, small short-circuit current, large short circuit current situation.And the threshold value of overload current, small short-circuit current, large short circuit current can arrange flexibly and regulate.Can adapt to multiple circuit application, there is very strong controllability and flexibility.

Claims (9)

1. a miniature circuit breaker, comprising:
The first moving iron core, is fixedly connected with the moving contact of miniature circuit breaker;
The first coil, around the first moving iron core setting;
Bimetal leaf, itself and the first coil are connected in series between the load end and moving contact of miniature circuit breaker;
It is characterized in that, miniature circuit breaker also comprises:
The second coil, is electrically connected to the neutral pole of miniature circuit breaker around the first moving iron core setting and an one terminals;
Wherein, while having overload current to flow through in bimetal leaf, bi-metal plate deformed is also electrically connected to another terminals of the second coil with the load end of miniature circuit breaker, and the electromagnetic field that the second coil produces impels first moving iron core motion so that miniature circuit breaker is disconnected.
2. miniature circuit breaker as claimed in claim 1, is characterized in that, also comprises:
The second moving iron core, along moving the orientation setting that iron core is identical and can move with respect to the first moving iron core with first;
Driven member, is electrically connected to the load end of miniature circuit breaker;
Wherein, each is set to the first coil and the second coil around the first moving iron core and the second moving iron core,
Wherein, while moving under the electromagnetic field effect that the second moving iron core produces at the first coil, the second moving iron core is actuated described driven member, and then a part for described driven member is electrically connected to another terminals of the second coil with the load end of miniature circuit breaker.
3. miniature circuit breaker as claimed in claim 2, it is characterized in that, driven member comprises lever, this lever energy is described another terminals rotation towards the second coil around pivotal point under the effect of bimetal leaf or the second moving iron core, and the movable end of this lever or mid portion are electrically connected to another terminals of the second coil with the load end of miniature circuit breaker.
4. miniature circuit breaker as claimed in claim 2, it is characterized in that, driven member comprises trolley pole, the two ends of this trolley pole are fixed with respect to miniature circuit breaker housing, and the mid portion of this trolley pole can be under the effect of bimetal leaf or the second moving iron core towards described another terminals deflection of the second coil, so that another terminals of the second coil are electrically connected to the load end of miniature circuit breaker.
5. miniature circuit breaker as claimed in claim 2, is characterized in that, driven member comprises:
Lever, its can be under the effect of bimetal leaf or the second moving iron core around the first pivotal point described another terminals pivotable towards the second coil, so that another terminals of the second coil are electrically connected to the load end of miniature circuit breaker;
Power connecting sheet, its can be under the effect of the described lever of bimetal leaf or rotation around the second pivotal point described another terminals pivotable towards the second coil, so that another terminals of the second coil are electrically connected to the load end of miniature circuit breaker.
6. the miniature circuit breaker as described in any one in claim 2-5, is characterized in that, first moves iron core is hollow cylinder and has along the longitudinal direction cavity, and the second moving iron core can be arranged in the described cavity of the first moving iron core with longitudinal sliding.
7. the miniature circuit breaker as described in any one in claim 2-5, is characterized in that, the cylinder that the first moving iron core is parallel adjacent setting with the second moving iron core.
8. the miniature circuit breaker as described in any one in claim 2-5, is characterized in that, when flowing through 2-15 times that the electric current of the first coil is rated current, the electromagnetic field that the first coil produces makes the second moving iron core actuate described driven member.
9. the miniature circuit breaker as described in any one in claim 2-5, is characterized in that, when flow through the electric current of the first coil be limit breaking current 60% or when larger, the electromagnetic field that the first coil produces makes the first moving iron core motion and miniature circuit breaker is disconnected.
CN201320604680.9U 2013-09-27 2013-09-27 Mini circuit breaker Withdrawn - After Issue CN203456402U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320604680.9U CN203456402U (en) 2013-09-27 2013-09-27 Mini circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320604680.9U CN203456402U (en) 2013-09-27 2013-09-27 Mini circuit breaker

Publications (1)

Publication Number Publication Date
CN203456402U true CN203456402U (en) 2014-02-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320604680.9U Withdrawn - After Issue CN203456402U (en) 2013-09-27 2013-09-27 Mini circuit breaker

Country Status (1)

Country Link
CN (1) CN203456402U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104517786A (en) * 2013-09-27 2015-04-15 施耐德电器工业公司 Miniaturized circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104517786A (en) * 2013-09-27 2015-04-15 施耐德电器工业公司 Miniaturized circuit breaker

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C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned
AV01 Patent right actively abandoned

Granted publication date: 20140226

Effective date of abandoning: 20170412