DESC:TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to an auxiliary (AUX) contact actuation system for switchgears. More particularly, present invention provides an auxiliary (AUX) contact actuation arrangement in ON & OFF conditions of the circuit breaker switches.

BACKGROUND AND THE PRIOR ART
It is necessary for electrical protection devices to provide true indication of the switching status (whether ON or OFF) for the safety of the operator. In general LED lights are used to show the status of the breaker (Breaker on LED on or Breaker OFF LED OFF or vice versa). To achieve this limit switches (also micro switches or AUX contacts) are used. Micro-switch has three terminals Common (C), Normally Closed (NC) & Normally Open (NO). During Normal conditions C and NC are connected and when micro-switch is actuated C & NC opens connecting C & NO. The indication devices are connected to the terminals of these AUC switches and provide indication when AUX switches from NO to NC or vice versa.
To actuate the AUX there is requirement of some actuator which transfers the movement of the contact shaft to the AUX which is moved or rotated by the arrangements of the mechanical links called mechanism. The operator has access to the mechanism through the knob which will be projected outwards from the housing of the breaker.
Conventional Moulded Case Circuit Breakers (referred here after as MCCB or breaker) have provisions for ON & OFF Auxiliary Contact (referred hereafter as AUX). AUX has a basic function of giving indication on transition of breaker to ON or OFF condition from any other condition. AUX is generally a micro-switch with three terminals Common (C), Normally Closed (NC) & Normally Open (NO). During Normal conditions C and NC are connected and when micro-switch is actuated C & NC opens connecting C & NO.
MCCB has three stable states –
a. ON: Contacts Closed & Mechanism Latched
b. OFF: Contacts Open & Mechanism Latched
c. Trip: Contacts Open & Mechanism De-latched
For normal ON / OFF operations of breaker the fork 23 has to be moved. By the movement of the fork breaker can be set into ON & OFF conditions. The basic information regarding MCCB operation and trip auxiliary contact can be referred from following two patents based on UV and SH.
Patent 1: Electric Circuit Breaker with improved trip alarm (US 3562733)
Patent 2: Mechanical bell alarm assembly for a Circuit Breaker (US 6882258 B2)
In conventional breakers the component used to actuate the actuator is mounted on latch link hinge point or it forms a rigid assembly with latch link. By this virtue the movement of the component is dependent upon the latch link movement.
Therefore, present invention provides an arrangement for actuation of AUX in ON & OFF condition to overcome the disadvantages of the conventional breakers. The present invention provides an arrangement which has an actuator which takes input directly from the shaft and actuates the AUX accordingly. Since the actuator is directly engaged with shaft by a special arrangement it travels linearly with the rotational movement of shaft. actuator is directly connected to the shaft so it provides true indication of the shaft location whether it is following stable states.

OBJECTS OF THE INVENTION
A basic object of the present invention is to overcome the disadvantages/drawbacks of the known art.
Another object of the present invention is to provide an auxiliary (AUX) contact actuation arrangement for circuit breaker.
Another object of the present invention is to provide true indication of the shaft location to the operator during ON and OFF condition of the circuit breaker.
These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.

SUMMARY OF THE INVENTION
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.
In an aspect of the present invention, there is provided an arrangement for auxiliary contact actuation in a circuit breaker(s), said arrangement comprising:
an auxiliary switch assembly comprises at least three terminal(s) and a auxiliary actuator link;
an operating mechanism assembly;
a rotating shaft having a rotor pivot profile and an actuator interface feature, said shaft assembled in a cassette by inserting said rotor pivot in a hole provided on said cassette, and said actuator interface feature projecting out through a slot provided on said cassette;
wherein an auxiliary actuator having at least two interface feature(s) and a slot; said auxiliary actuator connected to said rotating shaft by securing said slot with said actuator interface feature, therefore said auxiliary actuator facilitating upward and downward movement with the movement of said rotating shaft; thereby actuating said auxiliary switch assembly for indicating position of said rotating shaft during operation of said operating mechanism assembly in ON & OFF condition.
Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
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.
Figure.1 illustrates the Basic Breaker Assembly
Figure.2 illustrates the Auxiliary Switch assembly
Figure.3 illustrates the AUX Actuator
Figure.4 illustrates the Rotor (Shaft)
Figure.5 illustrates the Cassette
Figure.6 illustrates the Operating Mechanism Assembly
Figure.7 (a) & 7(b) illustrates the Operating Breaker with AUX and actuator in Latched (OFF) Condition
Figure. 8(a) & 8(b) illustrates the Operating Breaker with AUX and actuator in ON Condition.
Figure.9 illustrates the micro switch mounting features on Chassis.
Figure.10 illustrates the arrangement (Assembly) of AUX actuator with Cassette and Chassis
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.
Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.
By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
Accordingly, present invention provides an auxiliary (AUX) contact actuation arrangement for circuit breaker(s).
The present invention relates to an arrangement for actuation of AUX (4) when breaker is in ON & OFF condition. In conventional breakers have AUX actuator is mounted in cassette in the slot (73). Due to this arrangement the travel of actuator depends completely on the angle of rotation rotor (6). The angle of rotation of the rotor (6) is determined by mechanism (2) and contact system (1) parameters. Fig. 8a & 8b shows the ON condition of a breaker. These figures explain the actuation of AUX in ON condition.
The present invention provides an arrangement for actuation of AUX contact 4 when breaker switches in ON & OFF conditions or vice versa and provides the more accurate indication. Fig.1 shows the internal arrangement of switchgear. The switchgear arrangement has a housing or contact system or pole modules 3 which may be an integral or modular type of construction. An energy providing mean 2 this operates the breaker or switchgear with the help of springs and links and an outer enclosure 1just to hold all modules together. Housing 3 is made of using two symmetric components 7 called cassettes Fig.5 and has all the necessary components for making and breaking the circuit inside it.
The shaft 6 assembled inside the cassettes by inserting profile 61 in the hole 71 on cassettes. Slot 72 is provided to projecting out the actuator interface feature 62. Surfaces 73 and 74 are act as guide and stopper as well for the moving actuator. A front cover (Not shown in Fig) is used to cover all modules from front side and provide better aesthetics. The mechanism transfers its energy to the contact system through lower link 26 (Fig. 1A and 1B). Lower link 26 is attached as pivoted joint with the contact system shaft or rotor 6 Fig. 4 by inserting pin 25 in the hole 63. Thus allows the free movement of shaft 6. The mechanism 2 is mounted on the cassettes with the help of holes provided on the side plates 21 and 22 (Fig 6). Component 23 is an operator interface. A knob sits on this to provide better grip for operating the breaker in ON, OFF or Reset states. Mechanism 2 also has a link called trip plate 24 by rotating it in clockwise direction breaker can be tripped immediately. Component 5 is used to provide actuation to the trip alarm contact when breaker trips.
The innovatively designed actuator 5 (Fig 3) is used to actuate the AUX contact 4 (Fig 2).The actuator 5 rests on the surface 73 of the cassette 7 and moves upward and downward with the movement of the feature 62 which moves with the movement of shaft 6. At the time of assembly actuator interface feature 62 of shaft 6 engages with the feature made of surfaces 52 and 53 of actuator 5 (Fig 3) and actuates it with the movement of shaft (Fig 7A). The surface 51 is the actuating surface of actuator which hits the actuation link 42 of AUX contact 4 (Fig 2 and 3) and switched it ON and OFF with the up and down movement of actuator (Fig 7A and 7B). The longer limb 54 of actuator 5 comes out of the slot 82 of chassis 8 (Fig 9 and 10) and provides actuation for EOM with the breaker operation. Slot 82 also guides the actuator and holds it in the intended manner. The micro switch 4 will be mounted on the feature provided on the chassis 8 (Fig 9) by screwing it in the hole 81. Chassis will be mounted from the front side of the breaker Fig 10.
When operator turns ON the breaker by applying the force on knob assembled on the fork 23 in n left direction (Fig 1A) the lower links 26 pops out and rotates the shaft 6 in anti-clockwise for closing the contact inside the cassettes or housing. Because of the anti-clockwise rotation of shaft the actuator interface feature 62 moves upward (Fig 8A and 8B). When feature 62 moves upwards it also takes the actuator up by applying the force on the surface52 of actuator. The actuator 5 hits the auxiliary actuator link 42 of micro switch with the surface 51 thus switching the AUX/micro switch from NO to NC or vice versa and turns ON the LED connected on with the terminals 411, 412, 413.thia provides the indication to the operator that the shaft of breaker is in closed condition which truly shows that breaker is in ON condition and system is live. At this time the limb 54 also pops out from the chassis 8 which provides the inputs for actuation and/or indication of the EOM.
While making breaker ON, when fork (23) rotates to its full rotation, then due to link work rotor (shaft) (6) rotates to its full rotation. Due to this actuator interface feature (62) pushes the AUX actuator (5) in upward direction then AUX interface feature (51) hits the auxiliary actuator (42). Due to this AUX gets actuated. When AUX gets actuate, at the same time EOM actuation limb (54) actuates the EOM (Electrically Operated Mechanism).
When operator switches OFF the breaker by pressing the knob to the right side (Fig 1B) the lower links of mechanism moves upwards and shaft 6 rotates clockwise. Clockwise rotation of the shaft moves the actuator interface feature 62 downwards (Fig 7A and 7B) feature 62 applies the force on the surface 53 of the actuator 5 and brings down it. The surface 51 disengages from actuation link 42 of the micro switch 4. Due to this disengagement the link 42 opens up due to its inbuilt spring action and switches OFF the micro switch and the supply to the LED or indication mean cuts OFF. This shows the shaft or contacts of the breaker in open condition thus the breaker is OFF
Within same travel of AUX actuator, EOM actuation limb (54) is also use for guiding the actuator in proper manner.
· Hardware free assembly
· No spring element is used for actuation
· Provides true indication of shaft position
· Same component used for AUX and EOM actuation
,CLAIMS:1. An arrangement for auxiliary contact actuation in a circuit breaker(s), said arrangement comprising:
an auxiliary switch assembly comprises at least three terminal(s) and a auxiliary actuator link;
an operating mechanism assembly;
a rotating shaft having a rotor pivot profile and an actuator interface feature, said shaft assembled in a cassette by inserting said rotor pivot in a hole provided on said cassette, and said actuator interface feature projecting out through a slot provided on said cassette;
wherein an auxiliary actuator having at least two interface feature(s) and a slot; said auxiliary actuator connected to said rotating shaft by securing said slot with said actuator interface feature, therefore said auxiliary actuator facilitating upward and downward movement with the movement of said rotating shaft; thereby actuating said auxiliary switch assembly for indicating position of said rotating shaft during operation of said operating mechanism assembly in ON & OFF condition.
2. The arrangement as claimed in claim 1, wherein said interface feature(s) comprises an actuator interface feature and an electrically operated machine actuation interface feature.
3. The arrangement as claimed in claim 1, wherein anti-clockwise rotation of said rotating shaft through a knob assembled on a fork in said circuit breaker facilitate upward movement of said auxiliary actuator, thereby said actuator interface feature pushes said auxiliary actuator link consecutively switching said auxiliary switch assembly from normally open to normally closed.
4. The arrangement as claimed in claim 3, wherein said auxiliary switch assembly switching ON a LED(s) connected to said terminal(s) in closed condition of said rotating shaft for indicating the ON condition of said circuit breaker.
5. The arrangement as claimed in claim 3 and claim 4, wherein said electrically operated machine actuation interface feature pops out from aid cassette through a slot arrangement to facilitate actuation for an electrically operated machine with operation of said circuit breaker in ON condition.
6. The arrangement as claimed in claim 1, wherein clockwise rotation of said rotating shaft facilitate downward movement of said auxiliary actuator, thereby said actuator interface feature removed from said auxiliary actuator link consecutively switching said auxiliary switch assembly from normally closed to normally open.
7. The arrangement as claimed in claim 6, wherein said auxiliary switch assembly switching off said LED in open condition of said rotating shaft for indicating the OFF condition of said circuit breaker.
8. The arrangement as claimed in claim 1, wherein said actuator interface feature removed from said auxiliary actuator link due to inbuilt spring action of said auxiliary switch assembly.