FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION (See section 10 and rule 13)
TITLE OF THE INVENTION
A circuit breaker operating mechanism APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
Inventors
Vishal Vijay Bagade, Parag Prabhakar Khedkar, Shrikant Balkrishna Potnis of Crompton Greaves Ltd , S3 - Technology Department, Switchgear Complex, Ambad, Nasik-422010 Maharashtra, India, Indian National
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
This invention relates to a circuit breaker operating mechanism. BACKGROUND OF THE INVENTION
A conventional circuit breaker consists of a stationary contact 3 3 and a movable contact 4. The movable contact 4 moves relative to the stationary contact 13 for facilitating opening and closing of the circuit breaker. The movement of the movable contact 4 is actuated by an operating mechanism of the circuit breaker, which also controls the speed and automatic movement of the movable contact 4.
In an open position, the contacts of a circuit breaker are separated by a predetermined distance. The movable contact 4 travels the predetermined distance in a direction towards the stationary contact 13 to switch to a closed position. Similarly, to switch to an open position, the movable contact 4 travels the predetermined distance in a direction away from the stationary contact 13.
For circuit breakers, inter alia, breaking/closing time is an important design consideration which has a direct effect on the life of the stationary and movables of the circuit breaker. The longer the breaking/closing time, the more the stationary and movables will be prone to damage due to arcing at the time breaking/closing the circuit breaker to which the stationary and fixed contacts are exposed to. To achieve a high speed movement of the movable of the circuit breaker, it is essential that the operating mechanism of the circuit breaker is tough, durable and reliable.
Conventionally, a spring pneumatic type operating mechanism is used in a circuit breaker in which spring energy is used to move the movable for closing the circuit breaker and pneumatic energy is used to move the movable to open the circuit breaker. Such an operating mechanism is prone to air leakage, bulky and not reliable.

It needs an air compressor to maintain high air pressure in the pneumatic circuit. The compressor is usually noisy, vibrative and prone to oil leakage.
In an another type of circuit breaker operating mechanism, a motor runs a complicated gear, ratchet pawl arrangement to charge the closing spring which in turn charges the tripping spring during closing operation. Construction of such a mechanism is extremely complicated. DETAILED DESCRIPTION OF THE INVENTION
According to the invention, there is provided a circuit breaker operating mechanism for moving a movable contact of a circuit breaker, the operating mechanism comprising a combustion chamber divided into a pair of sub-combustion chambers, an interior tank held' within each sub-combustion chambers for storing at least one chemical reactant therein, at least one external tank corresponding to each interior tank provided outside the combustions chamber for storing at least one chemical reactant therein which being adapted to be controllably dropped/injected/sprayed into the corresponding interiortank wherein said chemical reactants of said tanks react to produce hydrogen gas within the respective sub-combustion chambers, a spark plug within each sub-combustion chamber for igniting the hydrogen gas therein wherein upon ignition of the hydrogen gas in the sub-combustion chambers the pressure within the sub-combustion chambers being increased, a piston within the combustion chamber being adapted to be thrusted upwardly/downwardly consequent to an increase in tlie gas pressure in the sub-combustion chamber, a transmission means for transmitting the movement of the piston to movable contact of the circuit breaker, a latchjng mechanism connected to the transmission means for locking the position of the transmission means and a blower opening into the combustion chamber for blowing out the burnt hydrogen gas

from the sub-combustion chambers through an exhaust port in the combustion chamber.
These and other aspects, features and advantages of the invention will be better understood with reference to the following detailed description, accompanying drawings and appended claims, in which,
Fig la and lb, according to an embodiment of the invention, are schematic views of a circuit breaker operating mechanism depicting respectively the operation of opening and closing the contacts of a circuit breaker.
Fig 2a and 2b, according to another embodiment of the invention, are schematic views of a circuit breaker operating mechanism depicting respectively the operation of opening and closing the contacts of a circuit breaker.
As shown in the figures, a circuit breaker operating mechanism comprises of a cylindrical combustion chamber 1 held rigidly on a ground or a base. The combustion chamber 1 is usually made up of high strength metals such as steel etc and of a size of 5 to 25 liters for a circuit breaker of a rating of MV7 HV or EHV (i.e. right form 6 KV till 800 KV). A cylindrical piston 2 made up of metal such as steel is disposed within the combustion chamber 1 held onto one end 4 of a shaft 3 such that the other end 5 of the shaft 3 extends out of the combustion chamber 1 and connected to a movable contact 4 of the circuit breaker. The area within the combustion chamber 1 above the piston 2 is the top sub-combustion chamber 6 and the area within the combustion chamber 1 below the piston 2 is the bottom sub-combustion chamber 7. Depending upon the movement of the piston 2 within the combustion chamber 1, the volume of the top 6 and bottom 7 sub-combustion chambers increases or decreases or remains equal. The side ends of the piston 2 and the corresponding inner surface of the walls of the combustion chamber 1 facing thereof are conditioned such that the piston 2 is

adapted to be slid or moved along thereof. For example, a small gap is maintained between the side ends of the piston 2 and the corresponding inner surface of the walls of the combustion chamber 1 or if they are provided in contact, proper lubrication is ensured between the said contacts such that the piston 2 is unobstructedly slid along the inner surface of the walls of the combustion chamber 1.
According to one embodiment, as shown in Fig la and lb, the transmission comprises of a shaft 3 one end 4 of which is connected to the piston 2 and the other end 5 connected to a movable contact 4 of the circuit breaker.
According to an another embodiment as shown in Fig 2a and 2b, the transmission means comprises of a shaft 3 and a lever 8 pivoted at its centre. The piston 2 is connected to one end 4 of a shaft 3 within the combustion chamber 1 whereas the other end 5 of the shaft 3 is connected to one end 9 of a lever 8 pivoted at its center, the other end 10 of the lever 8 is connected to a movable contact 4 of the circuit breaker. For locking/unlocking the position of the shaft 3, a latching mechanism (not shown) is connected the shaft 3 which is controlled by a circuit breaker control mechanism (not shown).
As shown in the fig la, the connection between the piston 2. shaft 3 and movable contact 4 of the circuit breaker is such that contacts (4 & 13) of the circuit breaker are closed. Also, the position of the piston 2 in the combustion chamber 1 is such that an exhaust port 11 and a blower opening 12 provided respectively at the middle of the opposite sidewalls of the combustion chamber 1 open in the bottom sub-combustion chamber 7. The blower opening 12 is connected to a blower through a one way flow valve 19 whereas a normal valve (not shown) is provided at the exhaust port 11. As shown in fig lb, when the piston 2 is pushed downwards beyond the exhaust port 11 and blower opening 12, the shaft 3 is pulled downwardly which

pulls the movable contact 4 of the circuit breaker connected therewith to move away from the stationary contact 13 of the circuit breaker thereby opening the circuit breaker.
To thrust the piston 2 downwards after unlocking of the shaft 3 by the latching mechanism, very high gas pressure is generated in the top sub-combustion chamber 6. To generate such a high pressure, firstly hydrogen gas is generated in the top sub-combustion chamber 6. Subsequently, it is ignited by means of a spark plug 14 opening into the top sub-combustion chamber 6. Preferably, the spark plug 14 opens into the combustion chamber 1 at the roof thereof. The hydrogen gas is generated within the top sub-combustion chamber 6 by facilitating a chemical reaction of at least two chemical reactants within an internal tank 15 provided within the top sub-combustion chamber 6. Preferably, the internal tank 15 is held onto the inner surface of one of the side walls of the combustion chamber 1 and proximal to the roof of the combustion chamber 1. Preferably, the chemical reactants are pieces of metal such as iron and hydrochloric acid. However, there may be used other chemical reactants, chemical reaction of which generates hydrogen gas. The iron pieces are disposed in the internal tank 15 whereas the hydrochloric acid is stored in an external tank 16 provided outside the combustion chamber I corresponding to the internal tank 15 of the top sub-combustion chamber 6. The hydrochloric acid therein is adapted to be controllably injected/sprayed into the internal tank 15 of the top sub-combustion chamber 6 onto the metal pieces for generating hydrogen gas. If more than two chemical reactants are involved, a second external tank is provided outside the combustion chamber 1 in which the third chemical reactant is stored and adapted to be controllably injected/sprayed/dropped into the internal tank 15 of the top sub-combustion chamber 6. Preferably, as shown in Fig la, the external tank 16 is held

upside down and the acid therein is injected/sprayed into the internal tank 15 through a pipe 17 opening into the top sub-combustion chamber 6 at the roof of the combustion chamber 1 through a one-way flow valve 18. A circuit breaker control mechanism is connected to the valves of the external tank 16, blower 20 and the exhaust port 11 for controlling opening/closing thereof. If the circuit breaker control mechanism senses a condition which requires the circuit breaker contacts (4 & 13) to open, it signals the latching mechanism to unlock the shaft 3 and to the valve 17 of the external tank 16 to allow the hydrochloric acid therein to be injected/sprayed onto iron pieces in the internal tank 15 of the top sub-combustion chamber 6. A chemical reaction of the iron pieces and hydrochloric acid occurs in the internal tank 15 which generates hydrogen gas within the top sub-combustion chamber 6. Thereafter, the circuit breaker control mechanism signals the spark plug 14 to ignite the hydrogen gas within the top sub-combustion chamber 6 which leads to a tremendous increase in the gas pressure therein which in turn leads to thrusting of the piston 2 downwardly. As described above, movement of piston 2 downwardly leads to the opening of the contacts (4 & 13) of the circuit breaker. Subsequently, the latching mechanism locks the shaft 3 in its position. As soon as the piston 2 moves beyond the exhaust port 11 and blower opening 12, the burnt hydrogen gas in the top sub-combustion chamber 6 flows out through the exhaust port 11. Additionally, the circuit breaker control mechanism signals the blower 20 to forcefully drive out all the burnt hydrogen gas from the top sub-combustion chamber 6.
As shown in Fig la and lb, a similar arrangement of spark plug 21, internal tank 22 and external tank 23 is provided for the bottom sub-combustion chamber 7. The spark plug 21 is provided opening into the bottom sub-combustion chamber 7 at one of the sidewalls of the combustion chamber 1, the external tank 23 held upside

down and opening into the bottom sub-combustion chamber 7 through a pipe 24 and a one-way flow valve 25 at one of the sidewalls of the combustion chamber 1, preferably below the spark plug 21. The internal tank 22 may be placed on the base of the combustion chamber 1 or held onto the side wall of the bottom sub-combustion chamber 7. Now, whenever the circuit breaker control mechanism decides to close the contacts (4 & 13) of the circuit breaker, it first signals the latching mechanism to unlock the shaft 3. Subsequently, very high gas pressure is generated within the bottom sub-combustion chamber 7. This is achieved in the same way as described above i.e. the circuit breaker control mechanism signals the one-way flow valve 25 of the external tank 23 of the bottom sub-combustion chamber 7 to allow the hydrochloric acid therein to be sprayed/injected into the metal pieces in the internal tank 22 of the bottom sub-combustion chamber 7. Subsequently, the spark plug 21 in the bottom sub-combustion chamber 7 is signaled by the circuit breaker control mechanism to ignite the hydrogen gas which in turns increases the gas pressure in the bottom sub-combustion chamber 7 tremendously. This thrusts the piston 2 upwards beyond the exhaust port 11 and blower opening 12. As described above, pushing the piston 2 upwardly results in an upward movement of the shaft 3 which in turn pushes the movable contact 4 of the circuit breaker connected thereto towards the stationary contact 13 of the circuit breaker to close of the contacts (4 & 13) of the circuit breaker. Subsequently, the latching mechanism locks the position of the shaft 3. As soon as the piston 2 moves beyond the exhaust port 11 and blower opening 12, the burnt hydrogen gas in the bottom sub-combustion chamber 7 flows out through the exhaust port 11. Additionally, the circuit breaker control mechanism signals the blower 20 to forcefully drive out all the burnt hydrogen gas therefrom.

According to the second embodiment and as shown in fig 2a, the connection between the piston 2. shaft 3, lever 8 and movable contact 4 of the circuit breaker is such that contacts of the circuit breaker are open. Also, the position of the piston 2 is such that the exhaust port 11 and blower opening 12 provided respectively at the middle of the opposite sidewalls of the combustion chamber 1 open in the bottom sub-combustion chamber 7. As shown in fig 2b. when the piston 2 is pushed downwards beyond the blower opening 12 and the exhaust port 11, the shaft 3 is pulled downwardly which rotates the lever 8 anti clock wise which leads to pushing of the movable contact 4 of the circuit breaker towards the stationary contact 13 of the circuit breaker thereby closing the circuit breaker.
To thrust the piston 2 downwards after unlocking of the shaft 3 by the latching mechanism, very high gas pressure is generated in the area of the top sub-combustion chamber 6. To generate such a high pressure, firstly hydrogen gas is generated in the top sub-combustion chamber 6. Subsequently, it is ignited by means of a spark plug 14 opening into the top sub-combustion chamber 6 at the roof of the combustion chamber 1. The hydrogen gas is generated within the top sub-combustion chamber 6 by facilitating a chemical reaction of at least two chemical reactants within an internal tank 15 provided within the top sub-combustion chamber 6. Preferably, the internal tank 15 is held onto the inner surface of one of the side walls of the top sub-combustion chamber 6 and proximal to the roof of the combustion chamber 1, Preferably, the chemical reactants are pieces of metal such as iron and hydrochloric acid. However, there may be used other chemical reactants, chemical reaction of which generates hydrogen gas. The iron pieces are disposed in the internal tank 15 whereas the hydrochloric acid is stored in an external tank 16 provided outside the combustion chamber 1 and corresponding to the internal tank 15 of the top sub-

combustion chamber 6. The hydrochloric acid in the external tank 16 is adapted to be controllably injected/sprayed into the internal tank 15 of the top sub-combustion chamber 6 onto the metal pieces for generating hydrogen gas. If more than two chemical reactants are involved, a second external tank is provided outside the combustion chamber 1 in which the third chemical reactant is stored and adapted to be controllably injected/sprayed/dropped into the internal tank 15 of the top sub-combustion chamber 6. Preferably and as shown in Figs 2a and 2b, the external tank 16 is held upside down and the acid therein is injected/sprayed into the internal tank 15 of the top sub-combustion chamber 6 through a pipe 17 opening into the combustion chamber I at the roof thereof through a one-way flow valve 18. A circuit breaker control mechanism is connected to the valves of the external tank 16, blower 20 and the exhaust port 11 for controlling opening/closing thereof. If the circuit breaker control mechanism senses a condition which requires the circuit breaker contacts to close, it signals the latching mechanism to unlock the shaft 3 and to the valve of the external tank 16 to allow the hydrochloric acid therein to be injected/sprayed onto iron pieces in the internal tank 15 of the top sub-combustion chamber 6. A chemical reaction of the iron pieces and hydrochloric acid occurs in the internal tank 15 which generates hydrogen gas within the top sub-combustion chamber 6. Thereafter, the circuit breaker control mechanism signals the spark plug 14 to ignite the hydrogen gas within the top sub-combustion chamber 6 which leads to a tremendous increase in the gas pressure which in turn leads to thrusting of the piston 2 downwardly. As described above, movement of piston 2 downwardly leads to closing of the contacts (4 & 13) of the circuit breaker. Subsequently, the latching mechanism locks the shaft 3 in its position. As soon as the piston 2 moves beyond the exhaust port 11 and blower opening 12, the burnt hydrogen gas in the top sub-

combustion chamber 6 flows out through the exhaust port 11. Additionally, the circuit breaker control mechanism signals the blower 20 to forcefully drive out all the burnt hydrogen gas from the top sub-combustion chamber 6.
As shown in Fig 2a and 2b, a similar arrangement of spark plug 21, internal tank 22 and external tank 23 is provided for the bottom sub-combustion chamber 7. The spark plug 21 is provided opening into the bottom sub-combustion chamber 7 at one of the sidewalls of the combustion chamber 1, the external tank 23 held upside down and opening into the bottom sub-combustion chamber 7 through a pipe 24 and a one-way flow 25 valve at one of the sidewalls of the combustion chamber 1, preferably below the spark plug 21. The internal tank 22 may be placed on the base of the combustion chamber 1 or held onto the side wall of the bottom sub-combustion chamber 7. Now, whenever the circuit breaker control mechanism decides to open the contacts (4 & 13) of the circuit breaker, it first signals the latching mechanism to unlock the shaft 3. Subsequently, very high gas pressure is generated within the bottom sub-combustion chamber 7. This is achieved in the same way as described above i.e. the circuit breaker control mechanism signals the one-way flow valves of the external tank 23 to allow the hydrochloric acid therein to be sprayed/injected into the metal pieces in internal tank 22 of the bottom sub-combustion chamber 7. Subsequently, the corresponding spark plug 23 in the bottom sub-combustion chamber 7 is signaled by the circuit breaker control mechanism to ignite the hydrogen gas which in turns increases the gas pressure in the bottom sub-combustion chamber 7 tremendously. This thrusts the piston 2 upwardly beyond the exhaust port 11 and blower opening 12. Pushing the piston 2 upwardly results in an upward movement of the shaft 3 which in turn rotates the lever 8 clock wise which in turn leads to pulling of the movable contact 4 of the circuit breaker away from the stationary contact 13 of

the circuit breaker thereby opening the contacts (4 & 13) circuit breaker, Subsequently, the latching mechanism locks the position of the shaft 3. As soon as the piston 2 moves beyond the exhaust port 11 and blower opening 12, the burnt hydrogen gas in the bottom sub-combustion chamber 7 flows out through the exhaust port 11. Additionally, the circuit breaker control mechanism signals the blower 20 to forcefully drive out all the burnt hydrogen gas from the bottom sub-combustion chamber 7.
It will be appreciated by a person skilled in the art that the above embodiments are described with respect to a combustion chamber 1 wherein the piston 2 is adapted to reciprocate vertically within the combustion chamber 1. If the piston 2 were to be reciprocated horizontally within the combustion chamber 1, consequential changes will be have to carried out within and outside the combustion chamber 1 with regard to the placement of the aforementioned components of the mechanism. For example, the spark plug and the interior tank corresponding to the sub-combustion chamber on the left side of the piston 2 open therein at left side wall of the combustion chamber 1, the interior tank corresponding to the sub-combustion chamber on the left side of the piston 2 being held onto the inner surface of the left side wall of the combustion chamber 1 such that while the hydrogen gas is ignited within the sub-combustion chamber on the left side of the piston 2, the piston 2 is thrusted towards the right side of the piston 2 such that the piston 2 travels beyond the openings of the exhaust port 11 and openings of the blower provided respectively at the middle of the roof and base of the combustion chamber 1. Similarly, spark plug and the interior tank corresponding to the sub-combustion chamber on the right side of the piston 2 open therein at right side wall of the combustion chamber 1, the interior tank corresponding to the sub-combustion chamber on the right side of the piston 2 being held onto the

inner surface of the right side wall of the combustion chamber 1 such that while the hydrogen gas is ignited within the sub-combustion chamber on the right side of the piston 2, the piston 2 is thrusted towards the left side of the piston 2 such that the piston 2 travels beyond the openings of the exhaust port 11 and openings of the blower provided respectively at the middle of the roof and base of the combustion chamber 1.
Preferably, the surface of the piston 2 5, inner surfaces of combustion chamber 1 and internal tank 15 22 13 are provided with Teflon coating or similar protective coating to prevent reaction with acid. The circuit breaker control mechanism is a typical software based control mechanism used and hence is not described here in detail.
According to the invention, there is provided a circuit breaker operating mechanism which is simpler in construction, has fewer components and easy to operate without much manual intervention.
Although the invention has been described with reference to a specific embodiment, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiment, as well as alternate embodiments of the invention, will become apparent to persons skilled in the art upon reference to the description of the invention. It is therefore contemplated that such modifications can be made without departing from the scope of the invention as defined in the appended claims.

We claim:
1. A circuit breaker operating mechanism for moving a movable contact of a circuit breaker, the operating mechanism comprising:
a. a combustion chamber divided into a pair of sub-combustion
chambers;
b. an interior tank held within each sub-combustion chambers for storing
at feast one chemical reactant therein;
c. at least one external tank corresponding to each interior tank provided
outside the combustions chamber for storing at least one chemical
reactant therein which being adapted to be controllably dropped into
the corresponding interior tank wherein said chemical reactants of said
tanks react to produce hydrogen gas within the respective sub-
combustion chambers;
d. a spark plug within each sub-combustion chamber for igniting the
hydrogen gas therein wherein upon ignition of the hydrogen gas in the
sub-combustion chambers the pressure within the sub-combustion
chambers being increased;
e. a piston within the combustion chamber being adapted to be thrusted
upwardly/downwardly consequent to an increase in the gas pressure in
the sub-combustion chamber;

f, a transmission means for transmitting the movement of the piston to
movable contact of the circuit breaker;
g. a latching mechanism connected to the transmission means for locking
the position of the latching means; and
h. a blower opening into the combustion chamber for blowing out the burnt hydrogen gas from the sub-combustion chambers through an exhaust port 11 in the combustion chamber.
2. The circuit breaker operating mechanism as claimed in claim 1, wherein oneway flow valves are provided at openings of the external tank and blower and a valve is provided at the opening of the exhaust port into the combustion chamber.
3. The circuit breaker operating mechanism as claimed in claim 1, wherein the transmission means comprises of a shaft, one end of which is connected to a piston and the other end to the movable contact of the circuit breaker.
4. The circuit breaker operating mechanism as claimed in claim 1, wherein the transmission means comprises of a shaft and a lever pivoted at its center wherein one end of the shaft being connected to the piston and the other end connected to one end of the lever outside the combustion chamber; the other end of the lever being connected to the movable contact of the circuit breaker.
5. The circuit breaker operating mechanism as claimed in claim 3 and 4. wherein the latching mechanism is connected to the shaft.
6. The circuit breaker operating mechanism as claimed in claim 1, wherein the piston is adapted to reciprocate vertically within the combustion chamber; the sub-combustion chambers being the top sub-combustion chamber and bottom

sub-combustion chamber respectively located atop and bottom of the piston respectively.
7. The circuit breaker operating mechanism as claimed in claim 6, wherein the spark plug and the external tank corresponding to the top sub-combustion chamber open therein at the roof of the combustion chamber, the interior tank corresponding to the top sub-combustion chamber being held therein proximally to the roof of the combustion chamber such that while the hydrogen gas is ignited within the top sub-combustion chamber, the piston being thrusted downwardly such that the piston travels beyond the exhaust port and blower opening, the exhaust port and blower opening being provided respectively at the middle of the opposite sidewalls in the combustion chamber.
8. The circuit breaker operating mechanism as claimed in claim 6, wherein the spark plug and the external tank corresponding to the bottom sub-combustion chamber open therein at one of the sidewalls of the bottom sub-combustion chamber proximally to the base of the combustion chamber, the interior tank corresponding to the bottom sub-combustion chamber being seated on the base such that when the hydrogen gas is ignited within the bottom sub-combustion chamber, the piston being thrusted upwardly such that the piston travels beyond the exhaust port and blower opening, the exhaust port and blower opening being provided respectively at the middle of the opposite sidewalls in the combustion chamber.
9. The circuit breaker as claimed in claim 1, wherein the piston is adapted to reciprocate horizontally within the combustion chamber, the sub-combustion chambers being on the left and right sides of the piston.

10. The circuit breaker operating mechanism as claimed in claim 9, wherein spark plug and the interior tank corresponding to the sub-combustion chamber on the left side of the piston open therein at left side wall of the combustion chamber, the interior tank corresponding to the sub-combustion chamber on the left side of the piston being held onto the inner surface of the left side wall of the combustion chamber such that while the hydrogen gas is ignited within the sub-combustion chamber on the left side of the piston, the piston is thrusted towards the right side of the piston such that the piston travels beyond the exhaust port and blower opening, the exhaust port and blower opening being provided respectively at the middle of the roof and base of the combustion chamber.
11. The circuit breaker operating mechanism as claimed in claim 9, wherein spark plug and the interior tank corresponding to the sub-combustion chamber on the right side of the piston open therein at right side wall of the combustion chamber, the interior tank corresponding to the sub-combustion chamber on the right side of the piston being held onto the inner surface of the right side wall of the combustion chamber such that while the hydrogen gas is ignited within the sub-combustion chamber on the right side of the piston, the piston is thrusted towards the left side of the piston such that the piston travels beyond the exhaust port and blower opening, the exhaust port and blower opening being provided respectively at the middle of the roof and base of the combustion chamber.
12. The circuit breaker operating mechanism as claimed in claim 3, wherein the movement of the piston and the movable contact is so synchronized through the transmission means such that upon movement of piston

downwardly/upwardly, the movable contact is moved to open/close its contact with the stationary contact of the circuit breaker or vice versa.
13. The circuit breaker operating mechanism as claimed in claim 4, wherein the movement of the piston and the movable contact is so synchronized through the transmission means such that upon movement of piston downwardly/upwardly, the movable contact is moved to close/open its contact with the stationary contact of the circuit breaker or vice versa.
14. The circuit breaker operating mechanism as claimed in claim 1, wherein the chemical reactant within the interior and external tanks are metal pieces and hydrocholic acid respectively.
15. The circuit breaker operating mechanism as claimed in claim 14, wherein the metal pieces are iron pieces.