Description:TECHNICAL FIELD
[0001] The present disclosure relates generally to the field of electrical protection devices. More particularly, the present disclosure relates to a withdrawable unit of circuit breakers. Specifically, the present disclosure relates to an operating mechanism to swivel a circuit breaker for engaging and disengaging current carrying parts between the circuit breaker and a cradle for the purpose of maintenance and/or replacement.

BACKGROUND
[0002] The following description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] As known in the conventional art, circuit breakers are used to safeguard electrical equipments from an overcurrent or a short current situation caused in the electrical equipment. During such faulty current conditions, the electrical contacts within a circuit breaker opens and stops the flow of electric current through the circuit breaker and to the electrical equipment.
[0004] Such circuit breaker systems are also termed as switchgear systems which can either be fixed to a bus bar system or be of removable type, known as draw-out circuit breakers with an enclosure. This enclosure is termed as a cradle arrangement provided for establishing and removing a connection with the bus bar system. A withdrawable circuit breaker unit, i.e., a draw-out module, is used to connect, test, and/or disconnect the circuit breaker to the main bus without unbolting or disturbing the termination. These circuit breakers are also known as air circuit breaker (ACB) or molded case circuit breaker (MCCB) or the like. Depending upon their construction, circuit breakers are classified as fixed and withdrawable/draw-out type circuit breakers as per international standards.
[0005] With the help of a mechanism, the circuit breaker is connected to main and auxiliary power supplies. As discussed above, the draw-out type circuit breakers comprise of two major parts a cradle and a circuit breaker. The cradle is the fixed part and the circuit breaker is moving part. The cradle is generally provided with an arrangement to load the circuit breaker and move it in and out of the cradle to achieve different positions such as isolated, test and service.
[0006] In the draw-out module, the cradle is used as base which has main contacts. The main supply is for circuit breakers and the auxiliary supply is for auxiliaries like shunt release, UV release, etc. There are three positions defining the connection between the cradle and the circuit breaker. A disconnect position is when both the auxiliary supply as well as the main supply are not connected, a test position is when only the auxiliary supply is connected but main supply is not connected, and a connect position is when both the auxiliary supply as well as the main supply are connected.
[0007] Further, the existing circuit breaker and cradle have a racking assembly which consists of a rack, racking screw, support bracket, lock nuts, and brass washer for moving the circuit breaker in and out of the cradle. However, the known methods for connecting the circuit breaker with the cradle generally comprise a differential engagement between extreme contacts (say, N and B pole) requiring high operating torque. This also results in sluggish movements and tilting of the circuit breaker which may further disturb the connection reliability. Thus, the conventional jaw contact system also causes an increase in the operational torque resulting in a sudden release of contacts. At the time of disengagement of contact from jaw contacts during a rack-out operation, jumping of breaker and jolt is also experienced.
[0008] There is therefore a need for a new racking mechanism with an easier construction and assembly, to eliminate the differential engagement between the extreme contacts by providing a gradual engagement and disengagement of contacts between the circuit breaker and the cradle, to operate on a low operating torque for an efficient contact connection, and to avoid jumping or dislocation of the circuit breaker while racking out of the cradle from the connect to the disconnect position.
[0009] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.

OBJECTS OF THE INVENTION
[00010] Some of the objects of the present disclosure, which at least one embodiment herein satisfies are as listed herein below.
[00011] It is an object of the present disclosure to provide system comprising a cradle with pivot pins for pivoting a circuit breaker on the cradle.
[00012] It is another object of the present disclosure to provide system for swiveling the circuit breaker.
[00013] It is another object of the present disclosure to provide system with a rail system for racking in and out of the circuit breaker into the cradle.
[00014] It is another object of the present disclosure to provide system with a racking mechanism for engaging and disengaging the circuit breaker with the cradle.
[00015] It is another object of the present disclosure to provide system for swiveling the circuit breaker from a disconnected or a test position to a connected position of the circuit breaker with the cradle.
[00016] These and other objects of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.

SUMMARY
[00017] The present disclosure relates generally to the field of electrical protection devices, more particularly, to a withdrawable unit of circuit breakers. Specifically, the present disclosure relates to a system for swiveling a circuit breaker for engaging and disengaging current carrying parts between the circuit breaker and a cradle.
[00018] According to an aspect of the present disclosure a system for swiveling a circuit breaker comprises a cradle having a racking mechanism. The racking mechanism swivels the circuit breaker along a pivot axis of the circuit breaker for engagement and disengagement of one or more power contacts of the cradle with one or more breaker contacts of the circuit breaker. The circuit breaker is pivoted on the cradle along the pivot axis.
[00019] In an embodiment, the cradle comprises a set of side plates and a rail system mounted on the set of side plates.
[00020] In an embodiment, the rail system enables a linear movement of the circuit breaker positioned on the rail system.
[00021] In an embodiment, the rail system comprises a set of seating slots for loading the circuit breaker onto the cradle at a predefined inclination.
[00022] In an embodiment, the racking mechanism swivels the circuit breaker from a disconnected or a test position to a connected position of the circuit breaker with the cradle.
[00023] In an embodiment, the racking mechanism is mounted on a bottom plate of the cradle and is operated manually or automatically.

BRIEF DESCRIPTION OF THE DRAWINGS
[00024] In the figures, similar components and/or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label with a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.
[00025] FIG. 1 illustrates a cradle 1 in accordance with an embodiment of the present disclosure.
[00026] FIG. 2 illustrates a circuit breaker 2 in accordance with an embodiment of the present disclosure.
[00027] FIG. 3 illustrates a racking mechanism 200 in accordance with an embodiment of the present disclosure.
[00028] FIG. 4 indicates an isometric view of the racking mechanism 200 mounted on the cradle 1 in accordance with an embodiment of the present disclosure.
[00029] FIG. 5 indicates a side view of the racking mechanism 200 mounted on the cradle 1, in accordance with an embodiment of the present disclosure.
[00030] FIG. 6(a) indicates an isometric view of a system 100 with the circuit breaker 2 loaded on the cradle 1, at disconnect or maintenance position, in accordance with an embodiment of the present disclosure.
[00031] FIG. 6(b) illustrates a side view of the system 100 with the circuit breaker 2 loaded on the cradle 1, at a disconnected or maintenance position, in accordance with an embodiment of the present disclosure.
[00032] FIG. 7(a) illustrates an isometric view of the system 100 with the circuit breaker 2, at a test position, pivoted to cradle 1, in accordance with an embodiment of the present disclosure.
[00033] FIG. 7(b) illustrates a side view of the system 100 with the circuit breaker 2, at a test position, pivoted to cradle 1, in accordance with an embodiment of the present disclosure.
[00034] FIG. 7(c) illustrates an isometric partial view of the system 100 with the circuit breaker 2, at a test position, pivoted to cradle 1 with a crank link 1.15 and a wedge system engagement, in accordance with embodiments of the present disclosure.
[00035] FIG. 8(a) illustrates an isometric view of the system 100 with the circuit breaker 2, at a connected position, pivoted to cradle 1, in accordance with an embodiment of the present disclosure.
[00036] FIG. 8(b) illustrates a side view of the system 100 with the circuit breaker 2, at a connected position, pivoted to cradle 1, in accordance with an embodiment of the present disclosure.
[00037] FIG. 8(c) illustrates an isometric partial view of the system 100 with the circuit breaker 2, at a connected position, pivoted to cradle 1 with a crank link 1.15 and a wedge system engagement, in accordance with embodiments of the present disclosure.
[00038] FIG. 9(a) illustrates an isometric view of a pivot mechanism of the cradle 1 at a pivoted position, in accordance with an embodiment of the present disclosure.
[00039] FIG. 9(b) illustrates a side view of an isometric view of the pivot mechanism of the cradle 1 at a de-pivoted position, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION
[00040] In the following description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. It will be apparent to one skilled in the art that embodiments of the present invention may be practiced without some of these specific details.
[00041] If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[00042] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[00043] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this invention will be thorough and complete and will fully convey the scope of the invention to those of ordinary skill in the art. Moreover, all statements herein reciting embodiments of the invention, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure).
[00044] While embodiments of the present invention have been illustrated and described, it will be clear that the invention is not limited to these embodiments only. Numerous modifications, changes, variations, substitutions, and equivalents will be apparent to those skilled in the art, without departing from the spirit and scope of the invention, as described in the claim.
[00045] The present disclosure relates generally to the field of electrical protection devices, more particularly, to a withdrawable unit of circuit breakers. Specifically, the present disclosure relates to a system for swiveling a circuit breaker for engaging and disengaging current carrying parts between the circuit breaker and a cradle.
[00046] According to an aspect of the present disclosure a system for swiveling a circuit breaker comprises a cradle having a racking mechanism. The racking mechanism swivels the circuit breaker along a pivot axis of the circuit breaker for engagement and disengagement of one or more power contacts of the cradle with one or more breaker contacts of the circuit breaker. The circuit breaker is pivoted on the cradle along the pivot axis.
[00047] In an embodiment, the cradle comprises a set of side plates and a rail system mounted on the set of side plates.
[00048] In an embodiment, the rail system enables a linear movement of the circuit breaker positioned on the rail system.
[00049] In an embodiment, the rail system comprises a set of seating slots for loading the circuit breaker onto the cradle at a predefined inclination.
[00050] In an embodiment, the racking mechanism swivels the circuit breaker from a disconnected or a test position to a connected position of the circuit breaker with the cradle.
[00051] In an embodiment, the racking mechanism is mounted on a bottom plate of the cradle and is operated manually or automatically.
[00052] FIG. 1 illustrates a cradle 1 in accordance with an embodiment of the present disclosure.
[00053] In an aspect of the present disclosure, a cradle 1 comprises a set of side plates 1.18 and 1.19 placed at a left side and a right side of the cradle 1, a bottom plate 1.5 placed at the bottom and in connection with the set of side plates 1.18 and 1.19, a bottom cross piece 1.4 in connection with the bottom plate 1.5, and one or more to top cross pieces 1.3 in connection with the set of side plates 1.18 and 1.19. The cradle further comprises a rail system 1.22 mounted on the set of side plates 1.18 and 1.19. The rail system 1.22 is used for enabling a linear movement of a circuit breaker 2 positioned on the rail system 1.22 (as shown in FIG. 6(a) and 6(b)). The cradle 1 comprises one or more power contacts 1.1 for engaging and/or disengaging with one or more breaker contacts 2.1 of the circuit breaker 2. The cradle may also comprise a back plate 1.26, in connection with the set of side plates 1.18 and 1.19 for mounting of various electrical components including but not limited to the one or more power contacts 1.1 or a wiring harness or the like.
[00054] In another aspect, the rail system 1.22 comprises a set of seating slots 1.23 for loading of the circuit breaker 2 onto the cradle 1. Each seating slot of the set of seating slots 1.23 corresponds to the left side and the right side of the cradle 1. The each seating slot of the set of seating slots 1.23 consists of a predefined inclination such that one or more breaker seaters 2.7 of the circuit breaker 2 rests in the predefined inclination in the each seating slot.
[00055] In another aspect, the cradle comprises a pivot mechanism for pivoting the circuit breaker 2 onto the cradle 1. The pivot mechanism comprises a pivot pin 1.20, a lock ring 1.21, and a retaining spring 1.24. The pivot mechanism may be mounted on both the left side plate and the right side plate of the set of side plates 1.18 and 1.19 forming a pivot axis of the pivot mechanism as well as the circuit breaker 2.
[00056] It would be appreciated that although aspects of the present disclosure are explained with respect to a manual operation of the pivot mechanism, those skilled in the art would appreciate that, the pivot mechanism may also be operated automatically through any functional means, without departing from the scope of the present disclosure.
[00057] In another aspect, the cradle 2 comprises a racking mechanism 200 for swiveling the circuit breaker 2 along the pivot axis of the circuit breaker 2 for engagement and disengagement of the one or more power contacts 1.1 of the cradle 1 with the one or more breaker contacts 2.1 of the circuit breaker 2.
[00058] In another aspect, the cradle 2 comprises one or more slots 1.25 for an efficient sliding movement of the racking mechanism 200 or one or more components of the racking mechanism 200.
[00059] FIG. 2 illustrates a circuit breaker 2 in accordance with an embodiment of the present disclosure.
[00060] The circuit breaker 2 comprises a set of pulling plates 2.2 and 2.3, one or more pivot plates 2.5 and 2.6, one or more breaker seaters 2.7, and the one or more breaker contacts 2.1. Each pulling plate from the set of pulling plates 2.2 and 2.3 comprises a pulling pin 2.4 for enabling a locking position with the racking assembly 200. The one or more breaker seaters 2.7 are inserted into the each seating slot from the set of seating slots 1.23 of the cradle 1, at the predefined inclination of the each seating slot. Further, each pivot plate from the one or more pivot plates 2.5 and 2.6 of the circuit breaker 2 is pivoted on the cradle 1 using the each pivot pin from the one or more the pivot pins 1.20 of the cradle 1. The pivoting of the circuit breaker 2 is confirmed by the lock ring 1.21 and the retaining spring 1.24 of the pivoting mechanism of the cradle 1.
[00061] FIG. 3 illustrates a racking mechanism 200, FIG. 4 indicates an isometric view of the racking mechanism 200 mounted on the cradle 1, and FIG. 5 illustrates a side view of the racking mechanism 200 mounted on the cradle 1, in accordance with an embodiment of the present disclosure.
[00062] In an embodiment of the present disclosure, the racking mechanism 200 swivels the circuit breaker 2 either from a disconnected or a test position to a connected position of the circuit breaker 2 with the cradle 1. The racking mechanism 200 comprises a set of wedge cam plates 1.10, one or more guide pins 1.13, a screw rod 1.7, a racking handle or key (not shown), a raising shaft 1.16, pulling link biasing spring 1.14, and a pulling link 1.11. Each wedge cam plate from the set of wedge cam plates 1.10 is in connection with the pulling link 1.11. In an exemplary aspect, the pulling link 1.11 is pivoted to an end of the each wedge cam plate from the set of wedge cam plates 1.10. Further, the each wedge cam plate from the set of wedge cam plates 1.10 comprises one or more guide pins 1.13 enabled to slide in the one or more slots 1.25 of the cradle 1, The each wedge cam plate from the set of wedge cam plates 1.10 is connected with each other via a wedge cam plate bridge connector 1.9. The wedge cam plate bridge connector 1.9 comprises a nut block 1.8 mounted on a center or a central zone of the wedge cam plate bridge connector 1.9. The screw rod 1.7 passes through the nut block 1.8 via a screw rod holder 1.6 and further extends outwards from a bottom cross piece 1.4 and/or a back plate 1.26 of the cradle 1. The screw rod 1.7 is rotated by the racking handle such that the wedge cam plate bridge connector 1.9 along with the set of wedge cam plates 1.10 moves in a forward or backward linear motion, enabling engagement and/or disengagement of the circuit breaker 2 with the cradle 1.
[00063] In an aspect, the raising shaft 1.16 comprises a crank link 1.15 at both its ends, wherein one end of the crank link 1.15 is pivoted to the cradle 1 and the other end of the crank link 1.15 is connected to an end of the raising shaft 1.16. The raising shaft 1.16 follows a cam profile on the each wedge cam plate from the set of wedge cam plates 1.10 for an upward and downward motion of the raising shaft 1.16 for engaging and/or disengaging the circuit breaker 2 with the cradle 1.
[00064] In an aspect, a rotation of the screw rod 1.7 by the racking handle causes a forward or backward movement of the wedge cam plate bridge connector 1.9 in a linear direction causing the upward or downward movement of the raising shaft 1.16 following the cam profile on the each wedge cam plate from the set of wedge cam plates 1.10. The upward movement of the raising shaft 1.16 causes a swiveling-in motion of the circuit breaker 2 and the downward movement of the raising shaft 116 causes a swiveling-out motion of the circuit breaker 2. Further, the swiveling-in motion of the circuit breaker 2 enables the engagement of the circuit breaker 2 with the cradle 1 i.e., the circuit breaker 2 and the cradle 1 are in connected position. The swiveling-out motion of the circuit breaker 2 enables the disengagement of the circuit breaker 2 with the cradle 1 i.e., the circuit breaker 2 and the cradle 1 are in the disconnected or the test position.
[00065] In another aspect, the swiveling-out motion of the circuit breaker 2 may be considered to enable the circuit breaker 2 to be in the test position when the the pulling link 1.11 of the racking mechanism 200 is in a locking position with the pulling pin 2.4 of the circuit breaker 2. Further, the swiveling-out motion of the circuit breaker 2 may be considered to enable the circuit breaker 2 to be in the disconnected or a maintenance position when the the pulling link 1.11 of the racking mechanism 200 is in a de-locking position with the pulling pin 2.4 of the circuit breaker 2.
[00066] In another aspect, the locking and de-locking of the pulling link 1.11 with the pulling pin 2.4 is enabled via a pulling link biasing spring 1.14. When the circuit breaker 2 is pivoted, the pivot pin 1.20 is held in its position by the lock ring 1.21, as shown in FIG. 9(a). The pivoting of the circuit breaker 2 is carried out for the test position with the cradle 1. Further, rotating the screw rod 1.7 clockwise to rack-in the circuit breaker 2 from the test position to the connect position, the circuit breaker 2 swivels anti-clockwise, with respect to the pivotable axis at the pivot pin 1.20, and simultaneously the pulling pin 2.4 disengages from the pulling link 1.11 to engage the one or more breaker contacts 2.1 of the circuit breaker 2 with the one or more power contacts 1.1 of the cradle 1 and vice-versa from the connect position to the disconnect position of the circuit breaker 2 with the cradle 1.
[00067] In an aspect, the pulling link biasing spring 1.14 ensures an automatic inter-locking as well as de-locking of the pulling pin 2.4 with the pulling link 1.11. An end of the pulling link biasing spring 1.14 is fixedly connected with the bottom plate 1.5 of the cradle 1 and the other end of the pulling link biasing spring 1.14 is fixedly connected with the pulling link 1.11. The pulling link biasing spring 1.14 may be any flexible link, like a spring or an elastic link or the like, for ensuring the automatic inter-locking and de-locking of the pulling pin 2.4 with the pulling link 1.11.
[00068] In an embodiment of the present disclosure, the racking mechanism 200 may be mounted on the bottom plate 1.5 of the cradle 1. The racking mechanism 200 may be operated manually or automatically using any motor or a computer program or any means as known to a person ordinarily skilled in the art. Further, the racking mechanism 200 may form an integral part of the cradle 1 or may be an independent system which may be attached to or detached from the cradle 1 as per requirement of the operation of the cradle 1 and the circuit breaker 2.
[00069] FIG. 6(a) indicates an isometric view of a system 100 with the circuit breaker 2 loaded on the cradle 1 at disconnect or maintenance position, and FIG. 6(b) illustrates a side view of the system 100 with the circuit breaker 2 loaded on the cradle 1 at a disconnected or maintenance position, in accordance with an embodiment of the present disclosure.
[00070] In an embodiment of the present disclosure, the circuit breaker 2 is loaded on the cradle 1 using the rail system 1.22. The one or more breaker seaters 2.7 of the circuit breaker 2 are inserted into the each seating slot of the set of seating slots 1.23 of the rail system 1.22. The circuit breaker 2 is loaded on the cradle 1 at an angular position with the predefined inclination of the each seating slot of the set of seating slots 1.23. At this position, the circuit breaker 2 is just loaded onto the rail system 1.22 and not inserted into the cradle 1. Any maintenance of the circuit breaker 2 and/or the cradle 1 may be efficiently performed at this position without completely separating the circuit breaker 2 and the cradle 1 in the system 100. Thus, this position may be termed as a maintenance position of the system 100.
[00071] In an aspect, the circuit breaker 2 may be pushed gently into the cradle 1 using the rail system 1.22. With this movement of the circuit breaker 2, the pulling link 1.11 of the cradle 1 rotates anti-clockwise against the pulling link biasing spring 1.14 and engages with the pulling pin 2.4 of the circuit breaker 2. This engagement of the pulling link 1.11 with the pulling pin 2.4 interlocks circuit breaker 2 with the cradle 1. Being flexible, the pulling link biasing spring 1.14 maintains the engaged position of the pulling link 1.11. This position may be termed as a disconnect position of the system 100, as there is no contact between the one or more power contacts 1.1 of the cradle 1 and the one or more breaker contacts of the circuit breaker 2.1.
[00072] In an embodiment of the present disclosure, the set of seating slots 1.23 may comprise a predefined inclination with respect to the rail system 1.22. Further, this predefined inclination of the set of seating slots 1.23 may range from 0 degree to 45 degrees, preferably in the range of 2-15 degrees. Each seating slot of the set of seating slots 1.23 may be configure at a same predefined inclination such that an efficient and smooth swiveling of the circuit breaker 2.
[00073] FIG. 7(a) illustrates an isometric view and FIG. 7(b) illustrates a side view of the system 100 with the circuit breaker 2, at a test position, pivoted to cradle 1, and FIG. 7(c) illustrates an isometric partial view of the system 100 with the circuit breaker 2, at a test position, pivoted to cradle 1 with a crank link 1.15 and a wedge system engagement, in accordance with embodiments of the present disclosure.
[00074] In an embodiment, the screw rod 1.7 is operated in a clockwise direction, by the racking handle or key, when the circuit breaker 2 and the cradle are in the disconnect position in the system 100. This clockwise rotation of the screw rod 1.7 racks-in the circuit breaker 2, in a linear direction or a direction parallel to the ground, from the disconnect position to a test position. Now, at test position, the circuit breaker 2 is pivoted by the one or more pivot pins 1.20 of the cradle 1 to the one or more pivot plates 2.5 and 2.6 of the circuit breaker 2. The one or more pivot pins 1.20 may be operated manually to pivot and de-pivot the circuit breaker 2 to the cradle 1. The each pivot pin of the one or more pivot pins 1.20 are held in their pivoted or de-pivoted position by the lock ring 1.21 and the retaining spring 1.24.
[00075] In an aspect, the pivoting and de-pivoting of the circuit breaker 2 onto the cradle 1 is carried out only at the test position of the system 100.
[00076] FIG. 8(a) illustrates an isometric view and FIG. 8(b) illustrates a side view of the system 100 with the circuit breaker 2, at a connected position, pivoted to cradle 1, and FIG. 8(c) illustrates an isometric partial view of the system 100 with the circuit breaker 2, at a connected position, pivoted to cradle 1 with a crank link 1.15 and a wedge system engagement, in accordance with embodiments of the present disclosure.
[00077] In an embodiment, a further rotation of the screw rod 1.7 of the racking mechanism 200 in the clockwise direction racks-in the circuit breaker 2 from the test position to a connect position with the cradle 1 in the system 100. The circuit breaker 2 further rotates anti-clockwise with respect to its pivotable axis at the pivot pin 1.20 and simultaneously disengages the pulling pin 2.4 of the circuit breaker 2 from the pulling link 1.11 of the racking mechanism 200. This racking-in or swiveling-in ensures the engagement of the one or more breaker contacts 2.1 of the circuit breaker 2 with the one or more power contacts 1.1 of the cradle 1, and vice-versa from the connect position to the disconnect or test position, in the system 1.
[00078] FIG. 9(a) illustrates an isometric view of a pivot mechanism of the cradle 1 at a pivoted position, and FIG. 9(b) illustrates a side view of an isometric view of the pivot mechanism of the cradle 1 at a de-pivoted position, in accordance with an embodiment of the present disclosure.
[00079] In an embodiment, the pivot pin 1.20, the lock ring 1.21, and the retaining spring 1.24 forms a pivot mechanism of the cradle 1. The pivot mechanism enables the pivoting and/or de-pivoting of the circuit breaker 2 by flipping the lock ring 1.21 towards or away from the cradle 1. When the pivoting of the circuit breaker 2 is to be performed, the lock ring 1.21 is flipped away or outwards from the cradle 1 and the pivot pin 1.20 gets inserted into the one or more pivot plates 2.5 and 2.6 of the circuit breaker 2, and held in its position by the lock ring 1.21 and the retaining spring 1.24, as shown in FIG. 9(a). For de-pivoting the circuit breaker 2 from the cradle, the lock ring 1.21 is flipped towards the cradle 1 and thus, the pivot pin 1.20 disengages from the circuit breaker 2 automatically by the retaining spring 1.24, as shown in fig 9(b).
[00080] In an exemplary embodiment of the present disclosure, the said system 100 may further be extended to a simpler means by pivoting the circuit breaker 2 at the disconnect position and thus, eliminating the linear movement of the circuit breaker 2 and achieving all the said disconnect, test and connect positions in a similar manner without any affecting the efficacy of the system 100 in engagement and disengagement of the one or more power contacts 1.1 of the cradle 1 with the one or more breaker contacts 2.1 of the circuit breaker 2.
[00081] The system 100 ensures smooth and gradual engagement and disengagement of the one or more power contacts 1.1 with the one or more breaker contacts 2.1 by further eliminating a sudden engagement/disengagement of the one or more power contacts 1.1 with the one or more breaker contacts 2.1 which may result in jumping of the system or degrading the reliability of the system.
[00082] Thus, it will be appreciated by those of ordinary skill in the art that the diagrams, schematics, illustrations, and the like represent conceptual views or processes illustrating systems and methods embodying this invention. The functions of the various elements shown in the figures may be provided through the use of dedicated hardware as well as hardware capable of executing associated software. Similarly, any switches shown in the figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the entity implementing this invention. Those of ordinary skill in the art further understand that the exemplary hardware, software, processes, methods, and/or operating systems described herein are for illustrative purposes and, thus, are not intended to be limited to any particular named.
[00083] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced.
[00084] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES
[00085] The present disclosure provides system for swiveling of a circuit breaker for rack-in and rack-out of the circuit breaker into the cradle with one or more pivotable joints.
[00086] The present disclosure provides system for a synchronized movement of the circuit breaker by a wedge cam plate arrangement in connection with a nut block and wedge cam plate bridge.
[00087] The present disclosure provides system with power screw mechanism coupled with a crank link mechanism in connection with the wedge cam plate arrangement for a smooth and effective swiveling of the circuit breaker.
[00088] The present disclosure provides system provides a pivot mechanism as a bistable pivotable mechanism for locking/unlocking of the circuit breaker to a pivotable axis in the cradle ensuring a leverage to the circuit breaker at the required travel from the maintenance/disconnect position and/or the test position to the connect position and vice-versa.
[00089] The present disclosure provides system with a raising (or, lowering) shaft configured to interact with the circuit breaker and the wedge cam plate arrangement for connect and/or test/disconnect position of the circuit breaker and the cradle.
[00090] The present disclosure provides the circuit breaker with pivot plates for pivoting and swiveling-in and swiveling-out of the circuit breaker with a high mechanical advantage.
[00091] The present disclosure provides system with a racking mechanism which improves the stability and reliability of the system.
[00092] The present disclosure provides system for swiveling the circuit breaker for preventing the transmission of repulsion forces (electrodynamic forces) to the racking mechanism.

DESCRIPTION OF REFERENCE NUMERALS
[00093] 1: cradle; 1.1: power contacts; 1.2: power contacts housing; 1.3: top cross piece; 1.4: bottom cross piece; 1.5: bottom plate; 1.6: screw rod holder; 1.7: screw rod; 1.8: nut block; 1.9: wedge cam plate bridge connector; 1.10: wedge cam plate; 1.11: pulling link; 1.12: pulling pin pivot; 1.13: wedge cam plate guide pin; 1.14: pulling link biasing spring; 1.15: crank link; 1.16: raising shaft; 1.17: crank link pivot; 1.18, 1.19: side plates; 1.20: pivot pin; 1.21: lock ring; 1.22: rail system; 1.23: seating slots; 1.24: pivot pin retaining spring; 1.25: slots; 1.26: back plate.
[00094] 2: circuit breaker; 2.1: breaker contacts; 2.2, 2.3: rear bottom pulling plates left; 2.4: pulling pin; 2.5, 2.6: pivot plates; 2.7: breaker seater.
, Claims:1. A system (100) for swiveling a circuit breaker (2), the system (100) comprising:
a cradle (1) having a racking mechanism (200) configured to swivel the circuit breaker (2) along a pivot axis of the circuit breaker (2) for engagement and disengagement of one or more power contacts (1.1) of the cradle (1) with one or more breaker contacts (2.1) of the circuit breaker (2); and
the circuit breaker (2) is configured to be pivoted on the cradle (1).

2. The system (100) as claimed in claim 1, wherein the cradle (1) comprises a set of side plates (1.18, 1.19) and a rail system (1.22) mounted on the set of side plates (1.18, 1.19), wherein the rail system (1.22) enables a linear movement of the circuit breaker (2) positioned on the rail system (1.22).

3. The system (100) as claimed in claim 2, wherein the rail system (1.22) comprises a set of seating slots (1.23) for loading the circuit breaker (2) onto the cradle (1), wherein each seating slot of the set of seating slots (1.23) comprises a predefined inclination such that one or more breaker seaters (2.7) of the circuit breaker (2) rest in the predefined inclination in the each seating slot.

4. The system (100) as claimed in claim 1, wherein the cradle (1) comprises one or more pivot pins (1.20) for pivoting and de-pivoting the circuit breaker (2) to the cradle (1), wherein each pivot pin from the one or more the pivot pins (1.20) engages and disengages with each pivot plate from one or more pivot plates (2.5, 2.6) of the circuit breaker (2) using a lock ring (1.21) and a retaining spring (1.24).

5. The system (100) as claimed in claim 1, wherein the racking mechanism (200) swivels the circuit breaker (2) either from a disconnected or a test position to a connected position of the circuit breaker (2) with the cradle (1).
6. The system (100) as claimed in claim 5, wherein the disconnected position or the test position or the connected position of the circuit breaker (2) with the cradle (1) is confirmed by the locking and de-locking of the pulling link (1.11) with a pulling pin (2.4) of the circuit breaker (2), wherein the locking and de-locking of the pulling link (1.11) with the pulling pin (24) is enabled via a pulling link biasing spring (1.14).

7. The system (100) as claimed in claim 1, wherein the racking mechanism (200) comprises:
a set of wedge cam plates (1.10), wherein each wedge cam plate from the set of wedge cam plates (1.10) is in connection with a pulling link (1.11) and comprises one or more guide pins (1.13) configured to slide in one or more slots (1.25) of the cradle (1), wherein the each wedge cam plate from the set of wedge cam plates (1.10) is connected with each other via a wedge cam plate bridge connector (1.9);
the wedge cam plate bridge connector (1.9) comprises a nut block (1.8), wherein a screw rod (1.7) passes through the nut block (1.8) and extends outwards from a bottom cross piece (1.4) of the cradle (1) and the screw rod (1.7) is configured to be rotated by a racking handle; and
a raising shaft (1.16) comprising a crank link (1.15) at both the ends of the raising shaft (1.16), wherein one end of the crank link (1.15) is pivoted to the cradle (1) and the other end of the crank link (1.15) is connected to an end of the raising shaft (1.16), wherein the raising shaft (1.16) is configured to follow a cam profile of the set of wedge cam plates (1.10).

8. The system (100) as claimed in claim 7, wherein a rotation of the screw rod (1.7) by the racking handle causes a forward or backward movement of the wedge cam plate bridge connector (1.9) in a linear direction, wherein the forward or backward movement of the wedge cam plate bridge connector (1.9) causes an upward or downward movement of the raising shaft (1.16) following the cam profile of the set of wedge cam plates (1.10).
9. The system (100) as claimed in claim 8, wherein the upward movement of the raising shaft (1.16) enables a swiveling-in motion of the circuit breaker (2) and the downward movement of the raising shaft (116) enables a swiveling-out motion of the circuit breaker (2), wherein the swiveling-in motion of the circuit breaker (2) enables the connected position of the circuit breaker (2) with the cradle (1) and the swiveling-out motion of the circuit breaker (2) enables the disconnected or the test position of the circuit breaker (2) with the cradle (1).

10. The system (100) as claimed in claim 1, wherein the racking mechanism (200) is mounted on a bottom plate (1.5) of the cradle (1) and is operated manually or automatically.