AN IMPROVED THREE PHASE COMPACT GAS CIRCUIT BREAKER
FIELD OF INVENTION
The present invention relates to a three phase common enclosure type sulphur hexafluoride (SF6) gas circuit breaker with all three phases located in a single grounded metallic chamber to interrupt the fault current in a high power electrical transmission and distribution system. More particularly, the present disclosure relates to the three phase common enclosure type SF6 gas circuit breaker with gang operating mechanism.
BACKGROUND OF INVENTION
Circuit breakers are employed to interrupt normal currents as well as short circuit currents generated during the fault conditions in a transmission system. In a common enclosure type gas circuit breaker, all the three phases of electric system are enclosed by common metallic enclosure filled with insulating gas at a pre-determined pressure. The electric current of a transmission system flows through the interrupter / pole of a circuit breaker in closed condition. The pole of a circuit breaker further comprises of two parts namely a 1) fixed contact system and 2) movable contact system.
PRIOR ARTS OF INVENTION
In the interrupter of the gas circuit breaker disclosed in the prior patent No. 217361 titled “An improved circuit breaker interrupter”, during the process of current interruption, a metallic puffer cylinder is deployed for compression of the gas. The metallic puffer subsequently discharge the compressed gas through the insulating nozzle for extinction of the arc in order to interrupt the flow of ·current in the electrical network.
US 5736704A titled “Circuit-breaker with grounded metal enclosure” describes conventional breakers where grounded enclosures are mounted horizontally. According to the invention, the pole comprises two gas-tight insulated bushings connected to the fixed contacts and to the movable contacts, respectively inside the enclosure. The movable contact is actuated by an operating rod passing through the enclosure in a gastight manner and connected to an operating mechanism outside the enclosure. The enclosure and the bushings are adapted to be filled with insulating gas.

The enclosure contains first and second metal supports with a set of fixed contacts and a set of mobile contacts, respectively supported by the first and second metal supports. The bushings each comprise a metal conductor surrounded by an insulated covering, each of the first and second metal supports having fixed to it a metal part having an annular portion surrounded by a deformable conical portion. The metal part has an axial bore in which the bushing conductor is inserted. A ring having a conical interior surface complementary to that of the conical portion is screwed onto the annular portion.
The patent US 5298703A titled “Gas circuit breaker” describes a three-phase common container-type circuit breaker in which breaker units of three phases are accommodated in a common container. Both the ends of each of these breaker units are extended out of the container via lead conductors and a common operation unit for driving the breaker units of three phases.
Therefore, it has been observed from the prior arts that the movable contact system of the circuit breaker is connected with operating mechanism which provides the required energy for the close (make) and open (break) operations of the circuit breaker. In the present disclosure describing a three phase gang operated common metallic enclosure type gas circuit breaker, a novel coupling element is provided to connect the movable contact systems of all the three interrupters/poles with a single operating mechanism. Efficient energy utilization of the operating mechanism enables the improved interruption / breaking of fault current by circuit breaker. Moreover, the three pole interrupters are placed vertically with their axis being parallel to each other one after another or in circular configuration.
OBJECTS OF THE INVENTION
It is an object of the present subject matter to overcome the aforementioned and other drawbacks existing in the prior art systems and methods.
It is one object of the present subject matter to propose a three phase common enclosure type
compact gas circuit breaker where the individual poles of three phases are coupled by a
horizontally placed common shaft for simultaneous operation by improved energy utilization from
common operating drive.

It is another object of the present subject matter to propose a novel coupling arrangement for the operation of all three poles of three phase common enclosure type compact gas circuit breaker that is guided in a common housing with reduced total height of the module.
It is still another object of the present subject matter to propose a novel coupling arrangement for the operation of all three poles of three phase common enclosure type compact gas circuit breaker where all the three poles are operated by using common shaft with single linkage through guide cum coupling plate.
It is yet another object of the present subject matter to propose a novel grounded enclosure to assemble all three poles of three phase common enclosure type compact gas circuit breaker
It is still another object of the present subject matter to propose a fixed arcing contact with an arc resistant insulating tip to reduce electric stresses and improved dielectric withstand capabilit y in open condition during arc interruption.
It is still another object of the present subject matter to propose a fixed arcing contact with insulating tip to reduce the contact erosion in order to improve the life of arcing contact.
It is still another object of the present subject matter to propose a high voltage shield in order to place suitably with respect to fixed arcing contact for improved fault current interruption capabilities and dielectric withstand capabilities.
It is yet another object of the present subject matter to propose an optimally designed movable main contact to achieve reduced moving mass for enabling efficient energy utilization to improve the speed characteristics of the specified operating drive.
It is yet another object of the present subject matter to propose an optimally designed movable contact system and fixed contact system to perform multiple functions.
It is a further object of the present subject matter to propose an efficiently profiled arcing insulator and fixed contact shield located at for improved dielectric withstand capabilities as well as higher short circuit current capabilities.
It is an even further object of the present subject matter to propose efficiently designed gas venting paths between various components for maintaining availability of required amount of gas at suitable pressure during various instances of circuit breaker operation.

SUMMARY OF THE INVENTION
This summary is provided to introduce concepts related to a three phase gang operated common metallic enclosure type gas circuit breaker with a novel coupling arrangement. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
Accordingly, there is provided a three phase common enclosure type compact gas circuit breaker with three poles comprising of a fixed contact system, a moving contact system, a fixed contact support, a movable contact support, a normal current carrying contact, a high voltage shield, a pressure propelled fixed arcing contact system with an insulated tip, a movable arcing contact, an insulating blast cylinder, a movable piston, an insulating nozzle, a support insulator, an arcing insulator, an insulating pull rod are integrated with the operating drive via a novel coupling arrangement guided through a common housing cum base plate supported from grounded enclosure for gang operation of the circuit breaker. A novel insulating tip is proposed with fixed arcing contact for improved dielectric withstand. An optimally designed movable main contact is proposed for reduced restrain forces and better energy utilization of the operating drive. A three phase grounded enclosure is proposed to accommodate novel coupling arrangement.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which

Figure 1 depicts high voltage shield (6) with respect to fixed arcing contact (8) with insulated tip (8F) in accordance with the present disclosure.
Figure 2 depicts pressure propelled fixed arcing contact (8) with insulated tip (8F) in accordance with the present disclosure.
Figure 3 shows insulating pull rod (15) with reference to support insulator (14) in close condition in accordance with the present disclosure.
Figure 4 shows proposed movable main contact (16) with multiple functions in accordance with the present disclosure.
Figure 5 depicts proposed metallic support of movable contact system (3) with multiple functions in accordance with the present disclosure.
Figure 6 depicts proposed metallic support of fixed contact system (2) with multiple functions in accordance with the present disclosure.
Figure 7 shows modified coupling arrangement of three phase compact gas circuit breaker (100) with guide tub in accordance with the present disclosure.
DETAILED DESCRIPTION OF INVENTION WITH REFERENCE TO THE
DRAWINGS OF THE PREFERRED EMBODIMENTS
The following is a detailed description of embodiments of the disclosure depicted in the
accompanying drawings. The embodiments are in such detail as to clearly communicate the
disclosure. However, the amount of detail offered is not intended to limit the anticipated variations
of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and
alternatives falling within the spirit and scope of the present disclosure as defined by the appended
claims.
While the embodiments of the disclosure are subject to various modifications and alternative
forms, specific embodiment thereof have been shown by way of example in the figures and will
be described below. It should be understood, however, that it is not intended to limit the disclosure
to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications,
equivalents, and alternative falling within the scope of the disclosure.

The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.
The present subject matter discloses a three phase gang operated common metallic enclosure type gas circuit breaker (100) with a novel coupling arrangement. Herein, a compact gas circuit breaker (100) is disclosed wherein a horizontally placed shaft couples all the individual poles of three phases which are positioned at the vertices of an equilateral triangle.
Figure 1 shows a high voltage shield (6) with respect to a fixed arcing contact (8) with insulated tip (8F). The corresponding pressure propelled fixed arcing contact (8) with insulated tip (8F) is depicted in Figure 2.
In an embodiment, as shown in Figure 1, the fixed contact system (2) comprises of a fixed arcing contact (8) and a fixed contact support (4), a normal current carrying contact (5) and the high voltage shield (6). The fixed arcing contact system (8) is equipped with an insulated tip (8F).
In accordance with Figure 2, in an embodiment, the designated pressure propelled fixed arcing system (8) provides movement due to available arc energy between a plurality of arcing contacts during the short circuit current interruption against a compression spring (8C).
In an aspect, a designated pressure propelled fixed arcing contact (8) comprises of a movable fixed arcing contact (8A), an insulated sleeve (8B), a compression spring (8C), a current transfer element(8D) and a lock nut (8E), as shown in Figure 2.
In another aspect, herein an arc resistant insulating tip (8F) is provided with the arcing contact (8A) in order to reduce the electrical field stresses across inter electrode gap. This insulating tip (8F) helps to reduce contact erosion by shifting the arc lines from centre of arcing contact (8A) to outer surface. The arcing between electrodes during fault current interruption is held inside an interrupter insulator (7) fitted with metallic end fittings on either side. The profiled metallic end fittings ensure enhanced dielectric withstand capabilities between inert electrode regions.

Figure 3 represents an insulating pull rod (15) attached to the movable main contact (16) and a
support housing-II (9) with reference to a support insulator (14) in close condition. In an
embodiment, the insulating pull rod (15) comprises of two terminals, i.e. a top plug (15A) at high voltage potential and a bottom plug (15B) at ground potential.
Figure 4 and Figure 5 depicts the movable main contact (16) and support housing-II (9) of a movable contact system (3) with multiple functions, respectively. In an embodiment, the movable contact system (3) further includes a movable arcing contact (13), the movable main contact (16), the insulating pull rod (15), an insulating nozzle (12) and a metallic piston (11). The movable main contact (16) is a current carrying component that ensures current transfer between electrodes during close condition. The movable main contact (16) is further provided with the metallic piston (11) to compress the gas in a compression zone (25) during the opening operation. The compressed gas is thrown into the arcing zone (26) via a gas passage (23).
In an aspect, this multi-function critical component has been further optimized to reduce total moving mass for enabling higher energy efficiency of the operating drive (21). This movable main contact (16) ensures dynamic transfer of the current between movable contact system (3) and terminal connection gas circuit breaker (100). The innovative moving contact performs a multitude of functions such as current carrying contact, as piston guide, as vent fo r discharging arced gas, as current transfer element (8D) to circuit breaker terminals, as housing for moving arcing contact and pull tube, as discharge vent for compressed gas to reach inter electrode arcing region etc.
In another aspect, the movable contact support (support housing-II) (9) provides support for the entire movable contact system (3) i.e. the movable main contact (16) along with the metallic piston (11), the insulated puffer cylinder (10), the insulating nozzle (12), the movable arcing contact (13). This housing facilitates for extending a current transfer (24) from the movable contact system (3) to the terminal connections/conductor (27). The movable contact support (9) also performs an additional function of the dynamic current transfer (24) from the movable main contact (16) to the terminal connections (27). It also provides the discharge path for the hot gas from inter electrode region via a multitude of rectangular slots (28) provided.
Figure 6 shows the proposed support housing-II (9) of fixed contact system (2) with multiple functions. In an embodiment, the fixed contact support (support Housing-I) (4) provides support

for the entire fixed contact system (2) i.e. the normal current carrying contact (5), the high voltage shield (6) and the pressure propelled fixed arcing contact system (8). This housing facilitates for extending current transfer from the fixed contact system (2) to the terminal connections (27). It also provides the discharge path for the hot gas from inter electrode region via said rectangular slots (28).
Figure 7 depicts the modified coupling arrangement with three phase compact gas circuit breaker (100) along with a guide tube (18). In an embodiment, the three phase gas circuit breaker (100) comprises of three numbers of separate interrupter poles enclosed in a common metallic chamber or grounded enclosure (1) with an insulated gas at predetermined operating pressure. The moving contact system (3) of these three poles is coupled to the common operating drive (21) for gang operation with the help of a common metallic shaft (20).
In an aspect, the metallic shaft (20) is coupled with an operating drive (21) on one side and to the movable contact system (3) on another side via a coupling element (19) with a suitable linkage (22). In another aspect, the individual poles as well as coupling arrangement with the common shaft (20) are housed in a single metallic chamber or grounded enclosure (1) for better utilization of available space. This coupling arrangement enables the integration of the operating drive (21) with the circuit breaker in right angle to the pole orientation instead of in-line with the axis of pole orientation, hence facilitates to achieve optimized bay dimensions. Moreover, the novel coupling arrangement enables the movement of individual poles by eliminating pole discrepancy with optimized bay dimensions.
In another aspect, in the arrangement of three phase system integrated with the common operating drive (21) as shown in Figure 7, a base plate (17) is firmly attached to grounded enclosure (1). The base plate (17) provides the support to the three poles of circuit breaker assembly. Entire three pole movable contact system (3) is guided in the guide tube (18) attached to the base plate (17) during opening and closing operation of circuit breaker module with the help of the coupling element (19). The base plate (17) is supported from grounded enclosure (1) using appropriate supports welded on grounded enclosure (1).
Moreover, the novelty of the proposed gas circuit breaker (100) is summed up as follows:

a) In the gas circuit breaker (100) disclosed in the present subject matter, a horizontally placed shaft (20) couples all the individual poles of three phases which are positioned at the vertices of an equilateral triangle.
b) In the proposed three phase common enclosure type compact gas circuit breaker (100), the coupling arrangement of three poles is guided in a common housing attached to the base plate (17) and is operated by a single drive in order to achieve reduced height of the circuit breaker.
c) The coupling arrangement of three phase common enclosure type compact gas circuit breaker (100) as disclosed in the present subject matter ensures simultaneous movement of all three phases of the gas circuit breaker (100) without any pole discrepancy.
d) In the three phase common enclosure type compact gas circuit breaker (100), a fixed arcing contact (8) is provided with arc resistant insulating tip for reduced electric filed stresses, improved dielectric capability of circuit breaker during opening operation.
e) The three phase common enclosure type compact gas circuit breaker (100) is equipped with a high voltage shield (6) for reduced electric field stresses. Moreover, the shield has been efficiently placed with respect to the fixed arcing contact (8) with an arc resistant insulating tip for improved current interruption capabilities during fault current interruption.
f) In the three phase common enclosure type compact gas circuit breaker (100) as disclosed in the present subject matter, a moving contact system is provided with the optimally designed movable main contact (16) for achieving reduced moving mass and thereby reduced restraining forces on the circuit breaker operating drive (21).
g) In the three phase common enclosure type compact gas circuit breaker (100) as disclosed in the present subject matter, the innovative moving contact performs a multitude of functions for instance, as the current carrying contact, as a piston guide, as a vent for discharging arced gas, as a current transfer element (8D) to circuit breaker terminals, as a housing for moving arcing contact and pull tube, as discharge vent for compressed gas to reach inter electrode arcing region etc.
h) In the three phase common enclosure type compact gas circuit breaker (100) as unveiled in the present subject matter, an insulating pull rod (15) is efficiently placed with reference to support insulator (14) during all states of operation of the gas circuit breaker (100) from open to close for

reduced electric field stresses on the insulator surface and an improved dielectric withstand capabilities.
i) The proposed three phase common enclosure type compact gas circuit breaker (100) is equipped with the support housing –I which holds the fixed contact system (2) and the support housing – II which holds the moving contact system in order to provide the path for gas exhaust and also facilitate to extend the terminal connections with other electrical systems via an insulating spacer.
The reference numerals along with the features as proposed in the present subject matter is listed as follows:
LIST:
1) Grounded Enclosure
2) Fixed contact system
3) Moving contact system
4) Fixed contact support
5) Normal current contact
6) High voltage shield
7) Interrupter insulator
8) Designated fixed arcing contact & insulated tip (8F)
9) Movable contact support
10) Insulated puffer cylinder
11) A metallic piston
12) An insulating nozzle
13) A movable arcing contact
14) Support insulator
15) Insulated pull rod
16) Movable main contact
17) Base plate
18) Guide tube
19) Coupling element
20) Shaft

21) Operating drive
22) Linkage
23) Gas path between compression zone to arcing region
24) Current transfer between movable contact system and terminal connection
25) Compression zone
26) Arcing region
27) Terminal conductor
28) Rectangular slots
Working of the invention
The present subject matter discloses an arrangement comprising of three phase common enclosure type gas circuit breaker (100). The three phase gas circuit breaker (100) comprises of three numbers of separate interrupter poles enclosed in a common metallic chamber or grounded enclosure (1) with insulated gas at predetermined operating pressure. The moving contact system for these three poles is coupled to the common operating drive (21) for gang operation with the help of a common metallic shaft (20). This metallic shaft (20) is further coupled with the operating drive (21) on one side and to a movable contact system (3) on another side via a coupling element (19) with suitable linkage. The individual poles as well as coupling arrangement with common shaft (20) are housed in a single metallic chamber or grounded enclosure (1) for better utilization of available space. This coupling arrangement enables the integration of operating drive (21) with circuit breaker in right angle to the pole orientation instead of in-line with the axis of pole orientation. Consequently, the arrangement facilitates to achieve optimized bay dimensions. The novel coupling arrangement enables the movement of individual poles by eliminating pole discrepancy with optimized bay dimensions.
Test results
The design features as disclosed in the present subject matter have been employed in three phase common enclosure type gas circuit breaker (100) of 145 kV voltage class. This gas circuit breaker (100) is designed for high voltage gas insulated substation applications. The developed gas circuit breaker (100) is tested for all high voltage duties as per IEC. The developed breaker is tested in three phase configuration for one minute power frequency and lightning impulse withstand

voltages. Moreover, the development is tested for short circuit duties at different fault currents like 31.5 kA and 40 kA, respectively.
Advantages of the invention
Additionally, the three phase common enclosure type compact gas circuit breaker (100) is having the following advantages:
a) Improved utilization of energy
b) Reduced electric stresses due to the presence of arc resistant insulating tip
c) Improved dielectric withstand capability in open condition during arc interruption
d) Reduced contact erosion by the arcing contact (8A)
e) Enhanced life of the arcing contact (8A)
f) Improved fault current interruption capabilities
g) Improved speed characteristics of the operating drive (21)
h) Availability of required amount of gas at suitable pressure during various instances of circuit breaker operation
It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
Although embodiments for the present subject matter have been described in language specific to package features, it is to be understood that the present subject matter is not necessarily limited to

the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/device of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited

to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
It will be further appreciated that functions or structures of a plurality of components or steps ma y be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.

WE CLAIM:
1. A three phase common enclosure type compact gas circuit breaker (100) comprising:
- at least three interrupter poles, wherein a grounded enclosure (1) houses the interrupter poles;
- a shaft (20) is placed horizontally and is configured to couple the interrupter poles by a coupling element (19);
- a fixed contact system (2) with a high voltage shield (6);
- a fixed arcing contact system, which includes a fixed arcing contact (8), a movable contact tube, a compression spring, a current transfer element (8D), a lock nut (8E), an insulating nozzle (12) and an insulated tip (8F);
- a movable contact system (3) equipped with a movable main contact (16);
- an insulating blast cylinder; and
- a support housing-I (4) and support housing-II (9) configured for coupling and guiding of movement of the movable contact system (3).

2. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claim1 wherein the horizontally placed shaft (20) couples said interrupter poles that the interrupter poles centers at the vertices of an equilateral triangle, wherein the axis of the plurality of interrupter poles are parallel to each other.
3. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claims 1-2, wherein a coupling arrangement of the three interrupter poles is guided in a common housing attached to a base plate (17), wherein the coupling arrangement of said interrupter poles is operated by a single drive (21) through said shaft (20) via said coupling element (19) with a linkage (22).
4. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claims
1-3, wherein the fixed arcing contact (8) is provided with the insulated tip (8F) , wherein the
insulated tip (8F) is adapted to be an arc resistant one.
5. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claims
1-4, wherein said movable contact system (3) performs a multitude of functions including a current
carrying contact (5), as a piston guide, as a vent configured for discharging arced gas, as a current
transfer element (8D) to a plurality of circuit breaker terminals, as a housing for a moving arcing

contact (13) and a pull tube, as a discharge vent for compressed gas to reach an inter electrode arcing region.
6. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claims 1-5, wherein an arcing insulator is configured to house said arcing between contacts, wherein a gas gap is present between said high voltage shield (6) and arcing insulator.
7. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claims 1-6, wherein a plurality of SF6 gas venting paths (23) is configured to maintain passage of an insulated gas at a pressure.
8. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claims 1-7 wherein said gas circuit breaker (100) includes placing of an insulating pull rod (15) with reference to a support insulator (14) during all states of operation of said gas circuit breaker (100) from open to close condition.
9. The three phase common enclosure type compact gas circuit breaker (100) as claimed in claims 1-8, wherein said support housing-I (4) holds the fixed contact system (2) and said support housing – II (9) holds the movable contact system (3), wherein the support housing-I (4) and II (9) provide a path for gas exhaust and extend a multitude of terminal connections (27) with a plurality of electrical system via an insulating spacer.