DESC:TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to circuit breakers. More particularly, present invention provides an arrangement for actuation of TAC actuator having different pivot axis than Latch link of the circuit breaker.

BACKGROUND AND THE PRIOR ART
Conventional Moulded Case Circuit Breakers (referred here after as MCCB or breaker) have provisions for Trip Auxiliary Contact (referred hereafter as TAC). TAC has a basic function of giving indication on transition of breaker to Trip condition from any other condition. TAC 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. Trip is a state of breaker in which the contacts are open and operating mechanism 2 trip plate 24 is de-latched. To bring the breaker to trip condition from ON condition the trip plate24 has to be rotated so as to de-latch the latch bracket 26. The force required to de-latch the trip plate 24 is very less compared to force required to move the breaker fork from On to OFF condition. Also transaction from On to Trip is faster than On to OFF. This process of rotating the trip plate 24 and de-latching the breaker is called as tripping of the breaker.
Trip is a state of breaker in which the contacts are open and operating mechanism is de-latched. To bring the breaker to trip condition from ON condition to Trip condition the trip plate has to be rotated so as to de-latch the latch bracket. The force required to de-latch the trip plate 24 is very less compared to force required to move the breaker fork from On to OFF condition. Also transaction from On to Trip is faster than On to OFF. This process of rotating the trip plate 24 and de-latching the breaker is called as tripping of the breaker. Fig 4 a & b shows latched and de-latched conditions of the mechanism.
While tripping the breaker the latch bracket 26 is de-latched from the trip plate 24 which allows latch link 25 to move away from latch bracket. To reset the breaker the same latch link is moved back which forces latch breaker to go in latched condition again. Conventional breakers use this movement of latch link 25 to actuate the TAC 4.
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 TAC 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, to overcome the drawbacks present in conventional circuit breaker, the present invention provides an arrangement for actuation of TAC actuator having different pivot axis than Latch link

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 arrangement for actuation of TAC actuator having different pivot axis than Latch link of the circuit breaker.
Another object of the present invention is to provide an arrangement for actuation of TAC actuator not forming rigid assembly with Latch link 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 actuation of TAC actuator having different pivot axis than latch link of the circuit breaker. The arrangement comprises:
an actuator comprises an actuator pivot point and a trip alarm contact interface point;
a latch link having an actuator interface feature and a latch link pivot point;
a mechanism trip plate;
wherein said actuator pivotally connected to said latch link to facilitate actuation of an auxiliary contact by rotation of said actuator with said latch link, thereby pushing said trip auxiliary contact actuator of said auxiliary contact to activate said auxiliary contact in trip 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 Operating Mechanism Assembly
Figure.4a illustrates the Operating Mechanism with Trip Plate Latched
Figure.4b illustrates the Operating Mechanism with Trip Plate de-latched
Figure.5a illustrates the Operating Mechanism with Trip Plate latched
Figure.5b illustrates the Operating Mechanism with Trip Plate de-latched and Latch link moved away from latch bracket
Figure.6 illustrates the Angle of rotation of latch link
Figure.7 illustrates the Construction of latch link
Figure.8 illustrates the Actuator for TAC
Figure.9 illustrates the Actuator assembly in breaker
Figure.10 illustrates the Breaker with TAC and actuator in Latched Condition
Figure.11 illustrates the Breaker with TAC and actuator in De-Latched Condition.
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 relates to an arrangement for actuation of trip alarm contact (TAC) 4, when breaker is in trip condition. Conventional breakers have TAC actuator mounted on the same axis as that of latch link hinge pin. Due to this arrangement the angle of rotation of actuator depends completely on the angle of rotation of latch link. The angle of rotation of the latch link is determined by mechanism 2 and contact system 1 parameters. The angle a shown in fig. 5 shows the rotation angle of latch link.
The fig 5(a) and 5(b) shows the travel of the latch link during On / Off to trip transition of the breaker. The angle a by which the latch link will rotate is defined by operating mechanism. So to get desired actuation movement of the actuator the TAC has to be mounted accordingly close or away from the latch link pivot point. Due to this feature the flexibility of mounting TAC in the breaker is lost.
The new actuator 5 designed is not a rigid component with latch link 25. The actuator 5 does not share common pivot axis with latch link 25. The actuator 5 is assembled in latch link slot 251. The Emboss 252 is pivot of latch link 25. This gives the flexibility of getting required actuation stroke from actuator 5 at any desired point by varying the actuator pivot point 51 and latch link interaction point 52 which is independent of the latch link pivot point 252. The actuator 5 is pivoted on a different axis than that of Latch link 25 and slot 251 is provided in latch link to assemble TAC actuator 5.In the present invention, the latch link is pinless,and a pin shaped extruded member from the latch link itself act as a pivotable member to do its function. In this case, there is a cut provided in the latch link in to which a plastic actuating member (which will give signal/input to the micro switch). The position of the cut is given in accordance to the travel required by the micro-switch and the place where it is positioned.
Fig.11While tripping the breaker the latch bracket 26 is de-latched from the trip plate 24 which allows latch link 25 to move away from latch bracket. Due to this the TAC actuator 5 rotated with respected to the latch link 25.
When TAC actuator 5 rotates with latch link 25, the TAC interface feature 52 pushes the auxiliary actuator 42 to activate Auxiliary contact (TAC) 4.
The TAC (micro switch) should be actuated by the mechanism indicating the TRIP condition of the mechanism. The trip condition can be obtained by taking the input to the micro switch only by two elements from the mechanism- latch link and trip plate. Normally the input is taken by a component which is fixed to the pin integrated to the latch link (the pin will act as a pivot to the latch link in the mechanism)
When the breaker is at ON or OFF condition, the micro switch remains open thus giving no input to the user. During the abnormal condition, if the breaker is tripped manually (Push To Trip) or by the sensing device (Thermo-Magnetic Release or Microprocessor Release) the micro switch is actuated. Thus giving alarm to the user. During TRIP, the latch rotates to a certain extent which is constrained by the mechanism designer.
Features of the present invention:
· TAC Actuator not forming rigid assembly with Latch link
· TAC Actuator having different pivot axis than Latch link
· Hardware free assembly.
,CLAIMS:1. An arrangement for actuation of a trip auxiliary contact actuator in a circuit breaker, said arrangement comprising:
an actuator comprises an actuator pivot point and a trip alarm contact interface point;
a latch link having an actuator interface feature and a latch link pivot point;
a mechanism trip plate;
wherein said actuator pivotally connected to said latch link to facilitate actuation of an auxiliary contact by rotation of said actuator with said latch link, thereby pushing said trip auxiliary contact actuator of said auxiliary contact to activate said auxiliary contact in trip condition.

2. The arrangement as claimed in claim 1, wherein said actuator assembled in said actuator interface point and pivoted on said latch link pivot point to provide flexibility to said actuator by varying said actuator pivot point and said latch link interface point, independent of said latch link pivot point.

3. The arrangement as claimed in claims 1 and 2 further comprising an extruded member from the latch link so as to facilitate pivotal movements.

4. The arrangement as claimed in claim 1, wherein said latch link comprising a cut positioned in accordance to the travel required by the micro-switch.

5. The arrangement as claimed in claim 1, wherein a latch bracket is de-latched from said mechanism trip plate facilitating movement of said latch link away from said latch, thereby rotating said actuator with respect to said latch link, during tripping of said circuit breaker.