FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention: INTEGRATED MONO-BLOCK TYPE
ELECTRIC POLE CONSTRUCTION
2. Applicant(s):
(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY : An Indian Company
(c) ADDRESS: L & T House, Ballard Estate, Mumbai 400 001.
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
The present invention relates to poles of Low Voltage (LV) current limiting circuit breaker and the likes, which are commonly used to receive, supply, protect and isolate the current supply in an electrical circuit.
BACKGROUND AND THE PRIOR ART OF THE INVENTION
Circuit breaker typically serves two basic purposes. As a switching device: Switching On/Off during normal operating conditions for the purpose of operation and maintenance. As a protecting device: Tripping or Isolating by breaking the contacts interrupting the fault current during abnormal conditions such as short-circuit, overload and under voltage.
Circuit breaker consists of one or more electric poles, whose number determined by the application as single pole circuit breaker, two pole circuit breaker, three pole circuit breaker, four pole circuit breaker, five pole circuit breaker and so on. Each pole is made of a contact system and each contact system consists of a moving contact, a pair of fixed contacts, a pair of arc chutes and Insulated drive shaft to rotate the moving contact to make connection and disconnection of current during ON-OFF operation. In-turn the fixed contacts are connected electrically to the phase or natural conductor associated with said pole.
Poles form the main function of housing all the contact system elements and to function to the expected level. Poles are expected to meet the requirements of electrical and mechanical properties.
In case of electrical devices, having more than one pole, the poles are formed by using a barrier in-between or the walls constructed.

In prior art, the method used for manufacturing and Arranging the contact system assembly have some drawbacks and critical aspects.
Currently the electrical poles used in industrially employed circuit breakers and the likes are available in various constructive embodiments, characterized to varying degree by modularity and detachability features, and are conceived to provide an adequate performance in electrical and mechanical terms. In particular, for the correct operation of the circuit breaker it is fundamentally important that the moving contacts of the various poles be actuated synchronously with each other, and that suitable electrical insulation is ensured among the electrically active parts, furthermore because of the significant power levels involved, the circuit breaker must be able to withstand adequately the mechanical stresses involved during its working life.
In the case of MCCB and the likes, the type to which the present invention relates, the components of the various poles are inserted in a box-like enclosure that is configured appropriately and is generally made of plastic, usually structural synthetic resins. Said case is a part of the outer enclosure of said circuit breaker and acts both as a containment element, and also rigidly couple mechanically the various poles to each other, and as a structural element, since it helps to withstand the considerable stresses and vibrations that are discharged onto it during transition of the device or in case of tripping or short-circuit. The outer enclosure of the circuit breaker is then generally completed by using a cover, also made of plastic, which is arranged on the front part of the circuit breaker, to cover the actuation elements of the circuit breaker, a knob, available for the manual intervention of operations, protrudes from the cover.
In this type of circuit breaker, a first constructive solution uses a single case that is divided internally into compartments to form seats in which various components of each pole are assembled; in this case, the partitions between the various compartments are shaped to allow the passage of a contact supporting shaft that

passes through, and affects, the various poles and on which the various moving contacts are mounted; moreover, the entire assembly is conceived to ensure adequate electrical insulation among said poles.
In second solution described in prior art US6377144 Bl, US5298874 uses a two-case constructive structure. In this solution, the various components of each pole are inserted first of all in a first case generally formed by two half shells, whose function is essentially to contain the components of each pole; then the cases of the various poles are in turn inserted in a second case, which in this solution also is part of the outer enclosure of the circuit breaker and performs mechanical -structural functions, in a manner similar to the one described above.
In both the cases, a critical aspect arises from the use of the outer containment cases, which generally have a complicated and bulky shape. Most of all manufactured in multiple varieties that are varied by size and number of poles constituting the circuit breaker; this clearly shows the use of variety of components and several molds and of considerable material, ultimately leading to an unnecessary and significant increase in production costs. Furthermore in two -case solutions it is often necessary to use special spacer modules or elements that are inserted in the outer enclosures for example, between two laterally adjacent poles, in order to occupy any free space and rigidly couple the poles keeping them in the correct position.
Moreover, because of the stresses and vibrations that the outer cases have to withstand, these containment elements are subjected to deterioration and deformation; accordingly, it is often necessary to replace the circuit breaker completely or possibly perform difficult and expensive maintenance operations in order to ensure adequate reliability. Clearly this has negative repercussions on the overall manufacturing and operating costs, and maintenance at site, of the circuit breaker.

From the electrical point of view, if one uses the two-case solution, the outer cases for containing the components of the individual poles must be shaped appropriately so as to suit for coupling to the elements on which the moving contacts of each pole are fitted, typically the sections of a contact supporting shaft. For this purpose, said inner cases have lateral openings through which transverse bars are passed; said bars are passed through the various poles and are meant to transmit the motion among the corresponding moving contacts so as to provide transitions that are as synchronous as possible.
Although this solution allows to transmit motion among the various poles, it requires additional openings in the containment cases, which must be sealed appropriately so that the gases normally generated inside the poles during a short circuit exit only through the venting channels provided for this purpose: to do so, said additional openings require the use of additional components which are appropriately shaped mechanical elements, and this increases the number of required constructive components, increases the constructive complexity of the entire assembly, and ultimately in the costs.
In another known type of solution described in prior art, US7116194 B2, where it is one case type of construction solution. Individual poles are formed by cassette type of construction and no additional provision of extra cover. Individual cassettes are formed by two half shell enclosures, which accommodates the contact system elements, provide an electrical pole for a LV power circuit breaker and the likes that has a smaller number of components than the previously described arts, but considerably has some disadvantages like Integration of individual cassettes and Integration of Multiple cassettes have to be taken care of.
In a typical 2 pole or more pole construction 2 individual poles or more poles are placed together laterally/ adjacently by arranging in such a fashion that the outer surfaces of the half shell enclosure (1) with half shell enclosure (2) in a surface to surface contact.

In this scenario, the pole 1 and pole 2 are separated by 2 half shell enclosure walls which are in duplication. The contact system assemblies are secured between such half shell enclosure walls forming a contact system chamber/ enclosure.
1. This calls for an involvement of more number of components for a multi-pole construction.
2. Also increases the hardware components for packing individual poles and packing two or more poles together to form multi-poles
These results in
Duplication of walls, where two or more such poles are placed adjacently.
Mounting and joining with other modules of the breaker is complex and the poles are independent and separate.
Repulsion between the poles during flashover is difficult to control with the said
hardware.
Pole to Pole alignment is not maintained because of relative movement between. Individual poles
Achieving Pole to Pole alignment with the axial alignment of IDS is tough.
Axial alignment of IDS dependent on the pole to pole alignment leads in difficulty to set alignment with mechanism's virtual center.
OBJECTS OF THE INVENTION
One object of the present invention is to overcome the disadvantages/drawbacks of the prior art.

A basic object of the present invention is to provide an electric pole for a LV power circuit breaker in which the connection among the various elements of said pole with other poles associated is provided simply and reliably, avoiding complicated joining and assembly operations.
Another object of the present invention is to provide an electric pole for a LV circuit breaker and the likes that is easy to manufacture and at modest costs.
These and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying
drawings.
SUMMARY OF THE INVENTION
One aspect of the present invention is to provide a multi - electric pole construction of Low Voltage (LV) current limiting circuit breaker and the likes, said multi electric pole construction comprising:
plurality of contact system assembly (3);
atleast one integrated structure means (9), said each structure means comprising:
a pair of uni-walled structure means , said uni-walled structure comprising a first
and a second wall structure.
wherein the first wall structure is placed substantially adjacent to the second wall
structure,
wherein the first wall structure is placed opposite to said second wall structure;
a hollow means having a substantially circular modular profile ,said hollow means
embedded substantially on the center of said first and second wall structure;
plurality of hardware means substantially placed on top of said first and second
wall structure adapted to join plurality of poles with each other;

said integrated structure means is having cavities that are provided to accommodate said contact system assembly within it;
a pair of enclosure (1,2), said each enclosure means having substantially half shell modular profile, said one of the enclosure means is placed on one of the extreme end of said multi - electric pole and another enclosure means is placed on another extreme end of said multi - electric pole such that both the enclosure are diametric to each other adapted to enclose said multi-electric pole circuit breaker;
said each enclosure means is having cavities that are provided to accommodate said contact system assembly within it;
such that said integrated structure means is one quantity less that the number of electric poles.
DETAILED DESCRIPTION OF THE INVENTION
In the present Invention of integrated mono block type construction, the poles are derived using a unique Common shared Wall structure between the contact system chambers, which is termed as integrated mono block structure along with atleast two half shell enclosures or end caps. Integrated mono block type is a mono-block construction having the features of the two half-shell enclosures on either side; so that their cavities that are shaped to accommodate their contact system elements are facing outside. The combined walls of two half shells featuring the details form a common wall with the thickness of the wall being formed increased, which in-turn provides high structural rigidity. To construct a multi-pole circuit breaker and the likes, atleast one such integrated mono block structure is used, essentially, along with 2 half shell enclosures. In any multi-pole construction, the number of such integrated mono block structures used are one quantity less than the number of poles formed and 2 half shells are always used on both the extreme ends as end caps, irrespective of the number of poles.

The present invention substantially / drastically reduces the number of components when compared to the existing solutions in a multi-pole construction. The number of components for a single pole construction remains same for both the present invention and the solution existing in the prior art.
For example,
In a conventional construction of 2 pole breaker and the likes, 4 components are used; where as only 3 components are used for the same 2 pole construction, by using an integrated mono block structure.
Similarly,
For a 3 pole breaker and the likes, 6 components are used as per the existing
solution/practice and only 4 components are used with integrated mono block
structures.
For a 4 pole breaker and the likes, 8 components are used as per the existing solution/practice and only 5 components are used with integrated mono block structures.
In this way, for a same multi-pole construction, the solution explained in the present invention allows to use only one component more than the number of poles formed which is far less a number when compared to the existing solution of using double the number of components to the number of poles formed.
This invention drastically reduces
- Number of components
- Number of hardware elements
- Component cost
- Manufacturing cost
- Assembly time

This invention substantially increases
- The structural rigidity
- The pole to pole alignment
- The pole to pole alignment with the axial alignment of Insulated drive shaft (IDS)
- Axial alignment of IDS with the mechanism's virtual center.
In the present invention the construction of multi-pole is done/achieved/ derived by using a unique structural insulated member which is used as a common partition wall for a 2-pole or multi-pole construction between the contact system chambers. This member is a single piece molded structure which bears all the details shaped up on both sides, to place / accommodate the contact system elements. Also there is a through and through circular passage via which the IDS are allowed to mesh with other IDS of the pole placed adjacently.
As the construction of the component is a single piece mold, the structural strength is inherited due to the thicker wall sections. This in turn withstands the repulsion forces by the gas pressure developed within the contact system chamber during flash over which is beneficial in a contact make and break scenario. In a multi-pole construction i.e. 2 pole, 3 pole, 4 pole etc. of a circuit breaker and the likes, this Integrated mono-block structure repeats itself in a designated order as the number of poles increases.
In this kind of arrangement the IDS of One pole is engaged with the IDS of another pole at the vertical central plane of the integrated mono-block structure via circular passage. Pluralities of the slots are provided to allow the driving means connection to the IDS.
The objects are achieved by an electric pole for a LV power circuit breaker and the likes, comprising of two end caps, called as half shell enclosures, and a Integrated mono block type structure, that has a lower wall and a upper wall, at

least one arc chute, at least one fixed contact and at least one moving contact that can be mutually coupled or uncoupled, and a first electric terminal and a second electric terminal that are functionally associated with said fixed contact and said moving contact and allow electrical connection of the pole in input and in output. In particular insulating enclosure comprises a first half-shell and a second half-shell. formed from Integrated mono block type structure, which are mutually coupled along corresponding coupling surfaces and form a self-supporting structure and first and second and third containment volumes and so on, which are arranged on mutually opposite sides with respect to said compartment and are suitable to accommodate respectively said first and second electric terminals.
In a Integrated mono-block type pole construction, for 2 pole breaker and the likes, one mono-block and two half shells are used for construction of poles as against the prior art where 4 half shells are used for achieving the same.
By doing this, the following benefits are achieved.
- Avoiding Individual cassettes hardware to pack the half shells. Reduction of Number of components there by reducing the manufacturing and material cost and assembly time.
- Internally increasing the structural strength to withstand the repulsion forces.
Eliminates the duplication of walls.
Pole to pole alignment is achieved due to relative constraints.
Hence, the IDS alignment with mechanism center is also
maintained.
Flexibility of pole construction is achieved due to the
modularity.
Components used in the invention:
1. Half shell enclosure (1) 2. Half shell enclosure (2)

3. To derive 2 or more pole Circuit breaker and the likes, 2 or more such similar poles(8) are arranged adjacently / laterally and fixed / held together/ paired using the hardware (7)which runs through the horizontal length of the unit / breaker.
4. In the present solution, Integral shared partition / Structural Shared partition, Electrically Insulated wall / Insulated Common Walled construction / Insulated Shared wall Construction / Unique Integral Shared wall partition (ISP)/ uni-walled structure components (9) are used. This ISP formed has the features of two half shell enclosures (1) (2) one on each side.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Other features as well as the advantages of the invention will be clear from the
following description.
In the appended drawings:
Fig 1 illustrates the contact system and poles of prior art.
Fig 2 illustrates the assembled electrical pole (8) of prior art
Fig 3 illustrates the placement of three such electrical poles (8) of prior art
Fig 4 illustrates the assembled three pole circuit breaker and the likes of prior art.
Fig 5 illustrates the formed uni-walled shared structure (9) which is termed as
Integrated mono block type in the present invention.
Fig 6 illustrates the formation of 3 pole circuit breaker and the likes with the help
of uni-walled construction.
Fig 7 illustrates the assembled multi-pole circuit breaker and the likes of the
present invention.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and illustrate the best mode presently contemplated for carrying out the invention. Further the system has been

discussed below to describe the way the system occurs. However, such description should not be considered as any limitation of scope of the present system. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence. In practice the materials and dimensions may be any according to the requirements, which will still be comprised within its true spirit.
Fig 1. represents the contact system and poles of prior art. The method of pole formation. Half shell enclosure (1), Half shell enclosure (2), contact system elements (3), Passage (4) for Assembling Insulated drive shaft (IDS), IDS (5), Holes for providing hardware for cassettes packing (6), Holes for providing hardware for multi-pole packing (7).
Fig 2. represents the assembled electrical pole (8) of prior art. The electrical pole (8) is formed by placing contact system elements (3) in-between half shell enclosure (1) and half shell enclosure (2) which is packed with the help of hardware through the holes (6).
Fig 3. represents the placement of three such electrical poles (8) of prior art placed such that the half shell enclosure (2) faces the surface of half shell enclosure (1), in order to form three pole LV circuit Breaker and the likes and so on as the number of poles increases. The hole (7) provided for packing the multi-pole breaker and the likes is used to pack the poles.
Fig 4. represents the assembled three pole circuit breaker and the likes of prior art. The assembled breaker and the likes shows the use of separate hardware (6) for packing individual cassettes and the use of separate hardware (7) for packing multi-poles. This clearly shows the use of more number of hardware. And the use of more number of components, that is double the number of poles, 6 components of half shell enclosure (1) and half shell enclosure (2), has been clearly seen.

Fig 5. represents the uni-walled shared structure (9) which is termed as Integrated mono block type in the present invention, which has the features shaped to accommodate the contact system elements assembly (3) securing them between the side (10) of one pole and side (11) of other similar pole placed adjacent to each other. This uni-walled structure is provided with a Passage (12) for IDS (5) to get connected to the IDS of the other pole, which acts as a common passage for two adjacent poles. Packing/joining of the Multi-pole is done by passing the designated hardware through the holes (13) provided on the said poles. An inherent structural rigidity is achieved due to the thicker cross-section formed within a single component of uni-walled structure. Duplication of walls(l) (2), which are assembled with surface to surface contact in case of multi-pole packing, is avoided by using a single walled construction (9).
Fig 6. represents the formation of 3 pole circuit breaker and the likes with the help of uni-walled construction. The poles are derived with the help of half shell enclosure (1) and half shell enclosure (2) and two uni-walled constructions (9) which are termed as Integrated mono block type components. As the number of poles increases, the Number of uni-walled construction (9) keeps repeating, and the number of half shell enclosures (1) (2) remains the same. In present invention, with this type of construction, the number of components used are just one number greater than the number of poles, which has drastic reduction in number of components compared to conventional prior art, which calls for double the number of components to the number of poles.
Fig 7. represents the assembled multi-pole circuit breaker and the likes of the present invention. The poles being derived from Uni-walled construction (9) and the half shell enclosures (1) (2) need not to be packed individually pole-wise (6) and separate packing for multi-poles (13). The entire assembly is done through the same hardware (13), which reduces the number of hardware elements used. The description also clearly states the drastic reduction in the number of components used. Formation of thicker section which inherently has higher structural rigidity.

Advantages:
Reducing No. of components and thereby reducing the manufacturing cost and material cost.
- Increasing the structural strength to withstand the repulsion
forces.
Reducing number of hardware to pack the half shells of
Individual poles.
Elimination of duplication of walls.
Achieving pole to pole alignment due to relative constraints.
Maintenance of IDS alignment with mechanism center.
Innovation lies in the way of achieving flexibility of pole
construction.
- Achieving modularity, improving functionality and increasing
the ease of assembly.
Reducing assembly time and increasing manufacturing ease.

WE CLAIM:
1. A multi - electric pole construction of Low Voltage (LV) current limiting circuit breaker and the likes, said multi electric pole construction comprising:
plurality of contact system assembly (3);
atleast one integrated structure means (9), said each structure means comprising:
a pair of uni-walled structure means , said uni-walled structure comprising a
first and a second wall structure ,
wherein the first wall structure is placed substantially adjacent to the second
wall structure,
wherein the first wall structure is placed opposite to said second wall
structure;
a hollow means having a substantially circular modular profile ,said hollow means embedded substantially on the center of said first and second wall structure;
plurality of hardware means substantially placed on top of said first and second wall structure adapted to join plurality of poles with each other;
said integrated structure means is having cavities that are provided to accommodate said contact system assembly within it;
a pair of enclosure (1,2) , said each enclosure means having substantially half shell modular profile ,said one of the enclosure means is placed on one of the extreme end of said multi - electric pole and another enclosure means is placed on another extreme end of said multi-electric pole such that both the enclosure

are diametric to each other adapted to enclose said multi-electric pole circuit
breaker;
said each enclosure means is having cavities that are provided to accommodate said contact system assembly within it;
such that said integrated structure means is one quantity less that the number of electric poles.
2. A multi - electric pole construction as claimed in claim 1 wherein said contact system comprising insulated drive system (IDS).
3. A multi - electric pole construction as claimed in claim 1 wherein said hollow means adapted to accommodate said IDS.
4. A multi - electric pole construction as claimed in claim 1 wherein said integrated structure means is substantially placed adjacent of another integrated structure means.
5. A multi - electric pole construction as claimed in claim 1 wherein said contact system assembly is placed substantially in-between the two integrated structure means to form an electric pole.
6. A multi - electric pole construction as claimed in claim 1 wherein said enclosure means is uni-walled structure means.
7. A multi - electric pole construction as claimed in claim 6 wherein said uni-walled structure means is similar in structure of said integrated structure means.
8. A multi - electric pole construction as claimed in claim 6 wherein said enclosure means is insulated.

9. An integrated structure means (9), said each means comprising:
a pair of uni-walled structure means , said uni-walled structure comprising a
first and a second wall structure ,
wherein the first wall structure is placed substantially adjacent to the second
wall structure,
wherein the first wall structure is placed opposite to said second wall
structure;
a hollow means having a substantially circular modular profile ,said hollow means embedded substantially on the center of said first and second wall structure;
plurality of hardware means substantially placed on top of said first and second wall structure adapted to join plurality of poles with each other;
said integrated structure means is having cavities that are provided to accommodate the contact system assembly within it.
10. An integrated structure means as herein substantially described and illustrated with the accompanying drawings.
11. A multi - electric pole construction of Low Voltage (LV) current limiting circuit breaker and the likes, as herein substantially described and illustrated with the accompanying drawings.