FORM2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention: IMPROVED MECHANICAL INTERLOCK FOR CIRCUIT BREAKERS
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 circuit breakers used in power distribution systems, in particular to mechanical interlock used for interlocking two or more circuit breakers. More particularly the present invention relates to an improved interlocking mechanism in circuit breakers to prevent the closing of more than a predetermined number of a group of independently operable circuit breakers.
BACKGROUND AND THE PRIOR ART
There are a number of applications where it is necessary that operation of two or more circuit breakers are coordinated in a manner such that only a certain number of breakers can be in closed (ON) position at a given point of time. One such application is providing a load with electrical power from either of two different power sources. It is important in such applications that only one circuit breaker be in closed position at a point of time to avoid fault between the two power sources. Another example for interlocking application is where two different loads are connected with electrical power from either of two different power sources with a bus coupler arrangement in between them. In such application only the circuit breaker connected with either one of the power source and the circuit breaker used as bus coupler needs to be in closed condition at a time for both loads to be connected to a single power source. In such application it is important to have interlock between all the three breakers such that all the three breakers should not be in closed condition at the same time to prevent electrical fault. Similarly there can be many other applications and different interlocking schemes for circuit breakers.
Reference may be made to Pat. No. U.S. 6069328 where an interlock mechanism is used to constraint the accessibility of selected circuit breakers for operation. But such type of interlock has the limitation that breaker has to be mounted in adjacent position only and it also does not provide with automatic working of neither interlock nor circuit breakers. Also this type interlock does not work for breakers which can be switched ON through electrical devices remotely. There are various other interlocks of similar kind in which the interlocked breakers either has to be of fixed type and some fixed in a specific pattern only.

Reference may be made to Pat. No. U.S. 5814777 and others as well in which the operating handles of the circuit breakers are interlocked for constraining the operation of circuit breakers against each other. However such type of interlock will not cater to the circuit breakers which have separate handles for ON and OFF operations. Also if the contacts of the breaker are in ON condition while its operating handle is in wrong position due to any-physical damage, the interlock will not prevent the interlocked circuit breaker from switching ON. Hence reliability of Interlock reduces.
Further most of the interlock systems also do not cater to the circuit breakers which have separate actuation points for electrical switching ON or OFF and separate actuation points for manual switching ON or OFF.
Reference may be made to Pat. No. U.S. 2531157 and many others receive the status of circuit breaker through position of contacts and subsequently constraint the interlocked breaker by actuating or releasing the trip command of the interlocked circuit breaker. Though this system is an effective method of interlocking but provisions need to be made which will fulfil all the present day system requirements
Reference may be made to Pat. No. U.S. 6486421 Bl relates to an interlocking of two circuit breakers, in which the state of one circuit breaker is derived from position indicator and other breaker is interlocked by actuating the trip member. It also provides for over travel trip compensation. However their design is limited for interlocking between two circuit breakers only. There is no provision for the same arrangement to be used for different scheme of interlocking. Also breakers have to be mounted in vertical one above the other position only. The connecting components between the two breakers are rigid components restricting different ways in which the breakers can be mounted. Further there is no provision if the interlocked breaker is forcibly tried to close which can lead to damage of mechanism components.
Reference may be made to Pat. No. U.S. 4286242 in this system a plunger actuated by closing of the contact arm on one switch rotates a connecting rod which holds the latch lever of the trip mechanism in the other circuit breaker in the unlatched or tripped position so that the second breaker cannot be closed. A similar arrangement engaging the contact arm of second breaker rotates a second connecting rod which in turn holds the trip latch of first circuit breaker in unlatched or tripped condition when the second breaker is closed.

However their design is limited for interlocking between two circuit breakers only. Also the breakers have to be positioned adjacently. The connecting components between the two breakers are rigid components restricting different ways in which the breakers can be mounted. Further there is no provision if the interlocked breaker is forcibly tried to close which can lead to damage of mechanism components. Also the system cannot be applied to draw out type of breakers and there is no provision for the same system to be used for different schemes for interlocking.
Reference may be made to Pat. No. U.S. 2531157, relates to an interlocking of two circuit breakers, in which based on the state of one circuit breaker, other breaker is interlocked by actuating the trip element. Further the trip element also blocks the close command thus ensuring double safety. However their design is limited for interlocking between two circuit breakers only. And breakers also have to be mounted in vertical one above the other position only. The connecting components between the two breakers are rigid components restricting different ways in which the breakers can be mounted. Also the system cannot be applied to draw out type of breakers and there is no provision for the same system to be used for different schemes for interlocking.
Reference may be made to Pat. No. U.S. 2009/0321239 talks about a design of interlock for circuit breakers, and in this design minimum three breakers and six wires are required. Also only the working of interlocking mechanism has been specified. How exactly it prevents the interlocked circuit breaker from switching ON (i.e. either by actuating the trip command or by blocking the close command) has not been specified. Further systems adaptability for fixed as well as draw out breakers not mentioned and there is no provision for the same system to be used for different schemes for interlocking.
There is therefore a need for an improved interlocking mechanism to prevent the closing of more than a predetermined number of a group of independently operable circuit breakers as per a predetermined scheme for closing and also providing double protection of the interlocked circuit breakers by actuating the trip command and simultaneously defeating the close command.

OBJECT OF THE INVENTION
The primary objective of the invention is to overcome the drawbacks/ disadvantages of the prior art.
It is an object of the invention to provide a mechanical interlock should be adaptable to be fixed on both fixed as well as draw out breakers without needing any modification in mechanical interlock or the circuit breaker.
Another object of the invention is to that apart from actuating the trip command the interlock should also disable the close command which will provide double protection as well as prevent forcible closure of the interlocked circuit breakers.
Another object of the invention is to prevent the interlocked breakers to CLOSE on giving a simultaneous CLOSE command.
Another object of the invention is to provide the status of the of the circuit breakers to be detected from actual position of the contacts
Another object of the invention is to provide an interlock assembly that can be mounted in any position and orientation so that the user can change the position and orientation of breakers whenever required without modification of the assembly.
Another object of the invention is to have provisions in the same assembly of mechanical interlock to be assembled on two or more than two circuit breakers and to allow different scheme of interlocking between multiple circuit breakers.
Another object of the invention is to provide an interlock with simple and minimum number of components to make the interlock site retrofitable.
Another object of the invention is to provide an interlock assembly to be economical and reliable for operation.

SUMMARY OF THE INVENTION
In accordance with the present embodiment of the invention there is provided a mechanical interlock used for interlocking two or more circuit breakers. The present invention is an improved interlocking mechanism for circuit breakers to prevent the closing of more than a predetermined number of a group of independently operable circuit breakers.
In accordance with another embodiment of the invention there is provided an improved mechanical interlock which can be used for fixed breakers, draw out breakers as well as combination of fixed with draw out type of circuit breakers for interlocking.
In accordance with another embodiment of the invention there is provided a first and second circuit breaker comprising
a primary assembly, said primary assembly comprising atleast one mounting bracket, atleast one control sliding bracket atleast one control bracket, atleast one status sliding bracket, atleast one pin assisting sliding, atleast one threaded connector, atleast one pin, and atleast one spring;
a secondary assembly comprising atleast one secondary mounting bracket, atleast one hole in said secondary mounting bracket, atleast one control actuator, atleast one secondary sliding link, atleast one trip actuator, and atleast one rivet on said secondary mounting bracket;
a breaker set assembly comprising atleast one trip member, atleast intermediate link, atleast one push button, atleast one pole shaft, atleast one welded link, atleast one interlock driver/pole shaft adapter, and atleast one pivot screw;
a plurality of provisional holes for different interlocking scheme;
a plurality of mounting holes; and
a plurality of provisional threaded holes connecting said threaded connector in different schemes.
In accordance with another embodiment of the invention there is provided a flexible cable connecting the first and second circuit breaker provides the locking.

BRIEF DESCRIPTION OF THE INVENTION
The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
FIG. 1 illustrates the schematic diagram of two draw out type of breakers connected with mechanical interlock
FIG.2 illustrates the schematic diagram of Interlock assembly connected on a fixed breaker.
FIG.3 illustrates an enlarged view of different Interlock components fixed on to a breaker
FIG.4 illustrates the right hand side view of breaker with few components of Interlock
FIG.5 illustrates the front view of secondary assembly on the breaker
FIG.6 illustrates the front view of draw out type of breaker showing the accessibility of few components
FIG.7 illustrates the detailed view of few components of primary assembly.
FIG. 8 illustrates the different type of fixing of components.
FIG.9 illustrates the method of interlocking two circuit breakers for a specific scheme of interlocking
FIG. 10 illustrates another method of interlocking three circuit breakers for a interlocking scheme.

DETAILED DESCRIPTION OF THE INVENTION
Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, alt such modifications are deemed to be within the scope of the claims.
It is also to be understood that the following claims are intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between.
BASIC CONSTRUCTION
Circuit breaker consists of a pole shaft (17) on which there is weided links (18) which are directly connected to breaker contact assembly. The pole shaft (17) is provided by an adaptor which acts as an interlock driver (19). This interlock driver (19) is rigidly attached onto the pole shaft (17). Base mounting bracket (1) is fixed on breaker directly in case of fixed breakers (refer fig 2) and on cradle (28) in case of draw out breakers (refer fig 1) by fastening hardware on the mounting holes (15) provided on the Base mounting bracket (1). Status sliding bracket (5) is assembled on Base mounting bracket (1) such that it can slide on the Base mounting bracket (1) with the help of a pin (13c). The pin (13c) can be threaded or riveted on Base mounting bracket (1) based on manufacturing preferences. The status sliding bracket (5) is positioned such that it is in the path of interlock driver (19) (refer fig 5 & 6). Base mounting bracket (1) consist of threaded holes (21) on which threaded connectors (16) are fixed. Base mounting bracket (1) also consists of control sliding bracket (3) which also slides on Base mounting bracket (1) with the help of a pin (13). These threaded connectors (16) join the flexible push pull cables (2) with the base mounting bracket (1) assembly.
The flexible cable (2) connects the two or more interlocked breakers. The flexible cables (2) pass through threaded connector (16) and connect with the status sliding bracket (5) on one end and control sliding bracket (3) of other interlocked breaker on the other end (refer fig 9). A spring (22) is placed on (16) such that it is compressed between Base mounting bracket (1) and control sliding bracket (3).

The control sliding bracket (3) is connected with the control bracket (4) with the help of a pin (13d). As control sliding bracket (3) slides up or down it rotates the control bracket (4) which is pivoted on (1) with the help of (13b). Control bracket (4) is positioned such that as it rotates it rotates along with it control actuator (7). The control actuator (7) is fixed and held on the breaker with the help of secondary mounting bracket (6). The control actuator (7) can rotate in its position. The control actuator (7) is further connected to secondary sliding link (8) which can slide on (6) with the help of rivets (23) on secondary mounting bracket (6). Secondary sliding link (8) is then connected to a detachable trip actuator (9) which actuates the trip member (10).
The breaker mechanism consists of a close intermediate link (11) which forms an intermediate link between the close push button (12) and closing linkages of the mechanism. This close intermediate link (11) also interacts with the trip member (10). The (11) can slide as well as rotate about a pivot screw (20) fixed on the breaker mechanism.
CONCEPT OF OPERATION
Two circuit breakers interlocked with each other requiring a scheme such that when one circuit breaker is ON (closed) other circuit breaker should not switch ON.
Components of first breaker are numbered and for second breaker the similar components are numbered same as that of first breaker followed by alphabet 'bWhen the first circuit breaker is closed the pole shaft (17) of the first breaker rotate in anti clockwise direction, moving the welded links (18) along with it for the contacts to close. As (17) rotates it also rotates the Interlock driver (19) which is fixed on to (17). As (19) rotates it moves the status sliding bracket (5) in the upward direction. When sliding bracket (5) moves in upward direction it pulls the flexible cable (2). The flexible cable (2) in turn pulls the control sliding bracket (3b) of the second breaker in upward direction. As control sliding bracket (3b) slides upwards it compresses a spring (22b) placed between it and Base mounting bracket (I). Also control sliding bracket (3b) as it slides upwards, rotate control bracket (4b) in clockwise direction. As control bracket (4b) rotates it rotates control actuator (7b) in clockwise direction. Control actuator (7b) in turn slides secondary sliding link (8b) in the upward direction. As sliding link (8b) slides in the upward direction the trip actuator (9b)

which is rigidly fixed with (8b) rotates the trip member (10b) of the breaker mechanism. As trip member (10b) is being rotated it makes the second breaker to remain in trip condition such that the second breaker cannot be closed.
When the first breaker is switched off (17) rotates in clock wise direction allowing (5) to move down under the forces from (22b). As sliding bracket (5) moves down, control sliding bracket (3b) also moves down allowing control bracket (4b). sliding link (8b) and trip actuator (9b) reset to their original position. This releases the trip member (10b) to its original position thus allowing the second breaker to close.
Similarly when second breaker is closed, pole shaft (17b) rotates welded links (18b) to close the contacts and pole shaft (17b) causes Interlock driver (19b) to rotate in anti clockwise direction. This moves sliding bracket (5b) in the upward direction causing the second flexible cable (2b) to pull control sliding bracket (3) of the first breaker in the upward direction. This causes spring (22) to compress also rotating control bracket (4) in the clockwise direction. As control bracket (4) rotates it causes control actuator (7) to rotate in the clockwise direction which in turn pulls sliding link (8) in the upward direction causing trip actuator (9) to rotate the trip member (10) of the first breaker. Thus the first breaker will not be able to close.
Again when the second breaker is switched OFF, pole shaft (17b) rotates in clockwise direction allowing sliding bracket (5b) to move down under the forces from spring (22). As sliding bracket (5b) moves down control sliding bracket (3) also move down allowing control bracket (4), sliding link (8) and trip actuator (9) to reset to their original position. This releases the trip member (10) to its original position allowing the first breaker to close.
Thus complete interlocking is achieved by the interlock assembly.
The multiple features of Mechanical interlock is explained below,
Useable on both fixed as well as draw out breakers
From FIG. 1 and FIG. 6 it can be observed that the base mounting bracket (1) can be mounted on cradle of draw out breakers. And form FIG. 2, FIG.3 , FIG.4 and FIG. 5 it is shown that the base mounting bracket (1) is be mounted on breaker directly in case of fixed breakers

Primary assembly (24) form an integral assembly. Base mounting bracket (1) can be mounted just by fastening two hardwares in the holes (15) provided on (1). And it can be observed that Primary assembly (24) interacts with (7) and (19) which are accessible for base mounting bracket (1) in case of both draw out as well as fixed breakers.
The secondary assembly (25) are mounted directly on breaker thus secondary assembly (25) remains common whether the breaker is used as fixed or of draw out type.
Also It is possible to mount primary assembly (24) on any type of breaker by modifying the positioning of mounting holes (15), control sliding bracket (3), control bracket (4) and status sliding bracket (5) as per the positioning of pole shaft (17) and control actuator (7) of particular type of breaker and its corresponding cradle.
In the F1G.1 and,2 a specific type of breaker is shown and all the position of interlock components is decided accordingly.
In the type of breaker shown components fixed on (1) interacts with control actuator (7) and (19) of the breakers. Since these components remain common for fixed as well as draw out type of breaker, the said interlock assembly can be used for both types of breakers.
Double safety by actuating the TRIP command as well as the defeating the CLOSE command.
When interlocking is provided in the present invention, trip member (10) of mechanism of the interlocked breaker is actuated this provides first level of safety from the breaker being switched ON. Further the trip member (10) when being actuated also presses a close intermediate link (11) in the downward direction. This close intermediate link (11) when pressed down disconnects the ON button (12) from the breaker mechanism. Thus when ON button is pressed, the command goes redundant. Hence providing double safety from breaker being turned ON
Interlocking also prevents the interlocked breakers to close on giving simultaneous close command.

In normal condition the interlocking starts working once the close command of any one of the breakers is given and the movement of contacts has begun. But if a simultaneous close command is given to more than one breaker, due to natural mechanical lag in movement of components the interlock will be delayed in working and the close command will be delivered to breaker mechanisms. Thus the breakers will tend to close irrespective of the interlocks provided.
In this invention provision is such that if simultaneous close command is given to more than one breaker initially all the close commands will be delivered to breaker mechanisms but as the pole shafts (17) start to rotate, trip members (10) of ail the interlocked breakers will rotate not allowing the breakers to make a proper close operation and tripping all the breakers in such a scenario.
Thus none of the breaker will switch ON if a simultaneous close command is given.
Status of the breaker derived from pole shaft directly connected to contacts, ensuring the reliability of the status perceived.
The interlock driver (19) is directly connected to the pole shaft (17) which has welded links (18) coupled with the contact assembly. Hence the status of the breaker as perceived by the interlock assembly will be accurate since the possibility of error due to number of intermediate linkages is eliminated. Thus, enhancing the reliability of the Interlock mechanism.
Circuit breaker can be mounted in any position and orientation within the length of interlock assembly cables.
The interlock mechanism of the interlocked breakers is connected via flexible push pull cables (2). Also the primary assembly and secondary assembly themselves are independent of position or orientation of the breakers. Thus within the reach of length of the cables (2) it is possible to mount the interlocked circuit breakers in any position or orientation without effecting the working of interlock assembly

Provisions provided in the same assembly to be useable for two or more circuit breakers also for different scheme of interlocking.
The primary assembly is provided with additional provisional holes (14) and (21) for different interlocking schemes.
In FIG. 1 two breakers interlocked with each other is shown. Such interlocking generally has a scheme such that if first breaker is closed the second breaker should not close and vice versa. The interlocking assembly arrangement for such system can be seen in FIG. 9. Wherein two flexible cables (2) are used such that status sliding bracket (5) of first primary assembly is connected with control sliding bracket (3b) of second primary assembly using first cable (2) and status sliding bracket (5b) of second primary assembly is connected with control sliding bracket (3) of first primary assembly using a second cable (2b).
Similarly for 3 breakers by adding a third primary assembly and two additional flexible cables (2) different schemes for 3 circuit breakers can be achieved. One such example is provided in figure 10. In which for the third primary assembly an additional flexible cables are connected with control sliding bracket (3c) and status sliding bracket (5c) by using additional provisional holes (21) provided in the primary assembly.
Thus in such type of interlocking assuming 3 breakers X, Y, Z. Breaker X fitted with primary assembly (24a) of (la), breaker Y fitted with primary assembly (24b) of base mounting bracket (lb) and breaker Z fitted with primary assembly (24c) of base mounting bracket (lc).
If breaker X is closed the status sliding bracket (5a) of primary assembly (24a) will move upwards pulling the control sliding bracket (3c) of primary assembly (24c) thus, breaker Y can be closed but, breaker Z cannot be closed.
'If breaker Y is Closed, the status sliding bracket (5b) of primary assembly (24b) will move upwards pulling the control sliding bracket (3c) of primary assembly (24c) thus, breaker X can be closed but, breaker Z cannot be closed.
If both breaker X and breaker Y are closed, the status sliding brackets (5a) of primary assembly(24a) and (5b) of primary assembly (24b) will move upwards pulling the control sliding bracket (3c) of primary assembly(24c) thus, breaker Z cannot be closed.

If breaker Z is closed, the status sliding bracket (5c) of primary assembly(24c) will move upwards pulling the control sliding bracket (3a) of primary assembly (24a) and control sliding bracket (3b) of primary assembly (24b). Thus, Both breaker X and breaker Y cannot be closed
Further since the secondary assembly (25) remains same for every breaker and is mounted on the breakers directly it can be mounted on any number of breakers.
This type of scheme is generally followed where there are two incomers and one standby circuit breaker
Similarly other interlocking schemes such as for Two incomers and one bus coupler type of interlocking and three incomers type of interlocking can be achieved by increasing the number of flexible cables (2) from four to six and adding control sliding brackets (3) to selected primary assemblies such as shown in FIG.8 .
Also more methods for connecting more than 3 breakers can be arranged and worked out using the same arrangement.
Suitable for site retrofitting
In this invention the interlock assembly consisting of Primary assembly (24) and flexible cables (2) are preassembled as per the scheme required by the customer. Hence at site only the primary assembly has to be mounted on the breaker or cradle, which can be easily done by fastening two hardwares in the mounting holes (15) provided on base mounting bracket (1). Further to fix secondary assembly (25), Control actuator (7), Secondary sliding member (8) and secondary mounting bracket (6) is placed on the breaker and fixed using regular hardware through the holes (27) provided on the secondary mounting bracket (6). Further the Trip actuator (9) is slider type detachable component which can be slided and fixed on secondary sliding member (8). Thus completing the entire assembly just by fixing four hardwares
Also since the position of mounting holes (15) is provided based on position of Control actuator (7) and interlock driver (19) no further alignment or adjustment is required to mount the interlock assembly.

Hence the interlock assembly can be easily fixed on to the breakers on site without any modification on the breakers.
Breaker or breaker sub assembles need not be dismantled for assembling the interlock assembly
As mentioned above the entire assembly can be fixed on breakers just by fastening little hardware for which the mounting holes are easily accessible both on breaker as well as cradle. Thus not requiring any breaker assembly to be dismantled.
Provision is provided in the interlock assembly such that the interlock assembly to make it redundant if required.
In the primary assembly (24) provision is provided such that the threaded connector (16) can be positioned to bottom most position. In this position the initial position of control bracket (4) can be set at a large distance from control actuator (7) such that when the interlocked breaker is closed although the status sliding bracket (5) of interlocked breaker will pull the control bracket of the breaker under consideration, the control bracket (4) will move but fill fail to actuate the control actuator (7). Thus making the interlock redundant. Similarly all the threaded connectors (16) of all the interlocked breakers can be positioned such that the control brackets (4) will fail to actuate their corresponding control actuators (7). Thus rendering the entire interlock assembly redundant.
ADVANTAGES
• Interlock assembly compatible with both fixed as well as draw out type circuit breakers.
• Double safety by actuating the TRIP command as well as the defeating the CLOSE command.
• Apart from normal interlocking also prevents the interlocked circuit breakers to close on giving simultaneous close command.
• Status of the breaker derived from pole shaft directly connected to contacts through welded links thus, ensuring the reliability of the status perceived.

• Circuit breaker can be mounted in any position and orientation within the length of interlock assembly cables.
• Provisions incorporated in the same assembly to be useable for two or more circuit breakers and for different schemes of interlocking.
• Suitable for site retrofitting.
• Breaker or breaker sub assembles need not be dismantled for assembling the interlock assembly.
• Provision also provided in the mechanical interlock assembly such that the interlock assembly becomes non functional if needed by the user.

WE CLAIM:
1. An improved mechanical interlock arrangement for two or more circuit breakers, said arrangement comprising
a) first circuit breaker and said second circuit breaker comprising:
a primary assembly, said primary assembly comprising atleast one base mounting bracket, atleast one control sliding bracket, atleast one control bracket, atleast one status sliding bracket, atleast one pin assisting sliding, atleast one threaded connector, atleast one pin. and atleast one spring positioned on said threaded connector operating inbetween said base mounting bracket and said control sliding bracket;
wherein said control sliding bracket slides on said base mounting bracket facilitated by the spring
wherein said control sliding bracket being connected to said control bracket by means of one of said sliding pin means
a secondary assembly comprising atleast one secondary mounting bracket, atleast one hole in said secondary mounting bracket, atleast one control actuator held by said secondary mounting bracket atleast one secondary sliding link, atleast one trip actuator, and atleast one rivet on said secondary mounting bracket;
a breaker set assembly comprising atleast one trip member, atleast OUQ intermediate link, atleast one push button, atleast one pole shaft, atleast one welded link, atleast one interlock driver/pole shaft adapter, and atleast one pivot screw; wherein said intermediate link of said breaker set interacts with said trip member and rotates about said pivot screw
a plurality of provisional holes for different interlocking scheme;
a plurality of mounting holes; and
a plurality of provisional threaded holes connecting said threaded connector in different schemes.

b) a flexible cable assembly connecting said first and second circuit breakers wherein said flexible cables pass through said threaded connectors connecting said status sliding bracket and said control sliding bracket wherein said cable assembly allowing the breaker to be mounted in any orientation or position within the length of the cables.
2. Arrangement as claimed in claim 1 wherein plurality of mounting holes allowing the base mounting bracket to be mounted on different type of breakers.
3. Arrangement as claimed in claim 1, wherein said base mounting bracket is fixed on a cradle in said draw out type circuit breakers and directly on breaker in said fixed type of breaker.
4. Arrangement as claimed in claim 1, wherein said base mounting bracket comprising a sliding bracket positioned in path of said pole shaft adapter/interlock driver.
5. Arrangement as claimed in claim 1, wherein said base mounting bracket comprising said threaded holes with additional provisional holes thereby fixing said threaded connectors for various schemes of interlocking.
6. Arrangement as claimed in claim 5, wherein said threaded connectors is adapted to join said flexible cables with said base mounting bracket
7. Arrangement as claimed in claim 1, wherein said control bracket is positioned at variable height with the help of said threaded connectors and rotates along with it said control actuator.

8. Arrangement as claimed in claim 1, wherein said control actuator further connected with said secondary sliding link on which a trip actuator is connected to actuate the trip member.
9. Arrangement as claimed in claim 1, wherein said interlock forms an intermediate link between said push button and closing linkages of said interlock mechanism.
10. An improved mechanical interlock arrangement for two or more circuit breakers as herein
described and illustrated with reference to accompanying drawings.