The present subject matter described herein, relates to a rotary handle assembly for molded case circuit breaker (MCCB) to prohibit access to the molded case circuit breaker (MCCB) in ON and TRIP condition. The present subject matter, in particularly, relates to a novel defeat mechanism provided in a rotary handle assembly for a molded case circuit breaker (MCCB).
BACKGROUND AND PRIOR ART AND PROBLEM IN PRIOR ART:
[002] Background 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.
[003] A rotary handle assembly for molded case circuit breaker (MCCB) is an accessory device used to operate a molded case circuit breaker (MCCB) from outside, without directly operating the operating handle of the molded case circuit breaker (MCCB).
[004] The rotary handle assembly allows the user to easily switch the breaker ON or OFF by a rotating action. The rotary handle assembly is equipped with a mechanism that prevents the panel door from being open when the breaker is in ON position.
[005] U.S. patent application US 7, 399, 934 B2 discloses an external operation handle device for a circuit breaker which includes a rotary handle equipped with a handle lock lever, a drive mechanism linking the rotary handle and the locker handle of the circuit breaker, and a door lock lever for interlocking between the rotary handle and a door of the board. By operating the rotary handle, the circuit breaker can be turned to an ON or OFF position, and the door is unlocked at an OPEN position. The handle lock lever is slidably disposed on the rotary handle to

be anchored and held at a pulled out position in a condition where the rotary handle at the OPEN position unlocks the door of the board, and the door lock lever linked to the rotary handle is cramped and held at the unlock position in a condition where the rotary handle is at the OPEN position.
[006] U.S. patent application US 5, 140, 155 A discloses an auxiliary switch-contacts condition indicator accessory having an enclosure comprising a case and a cover, a switch unit arranged within said enclosure and operated by means of a switch button, an actuator lever pivotally-mounted within said enclosure and arranged for contacting said switch button when said switch unit is in actuated and releasing said switch button when said switch is actuated, a paddle within said enclosure and connecting with said lever for movement to first and second positions in response to movement of said actuator lever, said cover being adapted for providing visual access to said paddle when moved to either said first or said second position, and an extension on said lever and a slot within said paddle, said extension being retained within said slot to move said paddle in unison with said lever.
[007] U.S. patent application US 4, 782, 583 A discloses a molded case circuit breaker crossbar assembly which allows the movable contact carrier, contact spring and contact carrier operating cam to be preassembled prior to insertion within the circuit breaker case. The crossbar is fabricated from a plastic molding composition having slots thereon for supporting the movable contact carrier and for retaining the charged contact operating spring. The contact carrier operating cam engages a roller carried by the operating mechanism link to couple the crossbar assembly to the circuit breaker operating mechanism.
[008] Japanese Patent Application JP 4, 215, 621 B2 discloses an external operating handle device for opening and closing a circuit breaker mounted on a switchboard, a control panel or the like by handle operation from outside the panel, having a slide base with a handle arm connected to the handle via. a turn base, and a roller, a lever, and a biasing spring from a direction perpendicular to the moving direction of the slide base with cam parts formed on the left and right side edges of the slide base.

[009] In prior rotary handle assemblies described above, there is no provision provided for intentional trip of the molded case circuit breaker (MCCB) without opening the door of the rotary handle assembly. Further, the mechanism provided to control the opening and closing of the rotary handle door restrict the movement of operating handle of the molded case circuit breaker (MCCB) which introduce a time lag in working of the molded case circuit breaker (MCCB) and damage the molded case circuit breaker (MCCB). Also, sometimes even when the molded case circuit breaker trips, the same condition is not followed by the rotary handle due to inefficient mechanism, connecting both the molded case circuit breaker and rotary mechanism.
[0010] Furthermore, the rotary handle assembly of prior arts are not compact and easy to manufacture due to which cost of manufacturing the same is high.
[0011] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
OBJECTS OF THE INVENTION:
[0012] It is therefore the object of the present subject matter to overcome the aforementioned and other drawbacks in prior method/product/apparatus.
[0013] The principal objective of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism which do not introduce time lag in working of the molded case circuit breaker.
[0014] Another object of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism which only open the rotary handle door in OFF condition of the molded case circuit breaker (MCCB).
[0015] Another object of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism having an intentional trip button.

[0016] Another object of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism which is capable enough to change the rotary handle position in accordance with operating position of the molded case circuit breaker.
[0017] Yet another object of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism which is compact and easy to manufacture.
[0018] Yet another object of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism which is easy to assemble.
[0019] Yet another object of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism which is cost effective.
[0020] Still yet another object of the present subject matter is to develop a rotary handle assembly with a novel defeat mechanism which comply with the Rohs compliance guide.
[0021] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.
SUMMARY OF THE INVENTION:
[0022] Solution to one or more drawbacks of existing rotary handle assembly in molded case circuit breaker (MCCB), and additional advantages are provided through the present rotary handle assembly with novel defeat mechanism as disclosed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure.
[0023] According to the preferred embodiment of the present subject matter, the rotary handle assembly for molded case circuit breaker (MCCB) to prohibit access

to the molded case circuit breaker (MCCB) in ON and TRIP condition comprises a rotary handle knob to manually reset the molded case circuit breaker (MCCB) after TRIP or OFF state, a rotary handle door provided below the rotary handle knob to cover the molded case circuit breaker (MCCB), a defeat mechanism to connect the rotary handle knob with operating handle of the molded case circuit breaker (MCCB), a bottom plate provided below the defeat mechanism to maintain distance between the molded case circuit breaker (MCCB) and the defeat mechanism, and a rotary handle base provided between the rotary handle door and the bottom plate to cover the defeat mechanism.
[0024] According to the preferred embodiment defeat mechanism of the rotary handle assembly controls the opening and closing of the rotary handle door in accordance with the operating state of the molded case circuit breaker (MCCB). The defeat mechanism comprises a plurality of slider pins, a slider rotary handle having provision on both sides to accommodate the plurality of slider pins and at bottom to accommodate operating handle of the molded case circuit breaker (MCCB), an engagement bar having one end fixedly connected to the slider rotary handle by means of a handle plate pin engaged on the top side of the slider rotary handle to move the engagement bar along with the slider rotary handle and other end of the engagement bar to restrict the opening of the rotary handle door when the molded case circuit breaker (MCCB) is in ON state, a spring support having a spring engaged with the fixed end of the engagement bar to restrain free motion of the engagement bar, a rotary handle punch to connect the rotary handle knob with the engagement bar for transmitting manual reset operation initiated by rotating the rotary handle knob to the engagement bar.
[0025] In an aspect, springs are provided on each of the plurality of slider pins to facilitate the engagement of engagement bar with rotary handle door.
[0026] In an aspect, each of the plurality of sliding pins are accommodated in the slider rotary handle by means of a bush, adjacent to the springs, to facilitate the sliding motion of the slider rotary handle.

[0027] In an aspect, the operating handle of the molded case circuit breaker (MCCB) engaged with the provision provided at the bottom of the slider rotary handle in a way that, any movement in operating handle of the molded case circuit breaker (MCCB), due to change in state of operation, is pass on to the engagement bar.
[0028] In an aspect, when the molded case circuit breaker (MCCB) TRIPS, the operating handle of the molded case circuit breaker (MCCB) moves to open the contacts and this movement of the operating handle is transmitted to the engagement bar through the slider rotary handle to slide the engagement bar slightly but not enough to disengage the engagement bar with the rotary handle door.
[0029] In an aspect, the molded case circuit breaker (MCCB) is reset by manually rotating the rotary handle knob due to which the rotating movement of the rotary handle knob is transmitted to the engagement bar through the rotary handle punch, which successively reset the molded case circuit breaker (MCCB) to ON condition, through the slider rotary handle engaged with the engagement bar.
[0030] In an aspect, a trip button is provided on the rotary handle assembly to intentionally trip the molded case circuit breaker (MCCB).
[0031] In an aspect, a sliding button is provided on the rotary handle base which is directly connected to the engagement bar for manually disengaging the engagement bar from the rotary handle door.
[0032] In an aspect, the rotary handle punch has a punch pin, a handle plate and a bush to connect the rotary handle knob with the engagement bar for transmitting manual reset operation initiated by rotating the rotary handle knob to the engagement bar.
[0033] In an aspect, a locking mechanism is provided on the rotary handle knob to lock the rotation of rotary handle knob while maintenance.

[0034] The locking mechanism comprises a locking knob provided on the rotary handle knob, and a knob slider provided adjacent to the locking knob wherein when the locking knob is pressed downwards, the knob slider slips down and engages with locking protrusions provided on the rotary handle base to restrict the rotation of the rotary handle knob.
[0035] The rotary handle assembly according to the preferred embodiment transfer the motion of the operating handle of the molded case circuit breaker to the rotary handle knob without any time lag. Thus, saving the molded case circuit breaker (MCCB) from potential damage.
[0036] The defeat mechanism of the rotary handle assembly according to the preferred embodiment does not let the rotary handle door to open in ON or TRIP condition.
[0037] Further, the intentional trip button provided on the rotary handle assembly solves the problem of opening the rotary handle door for intentional tripping.
[0038] Furthermore, the present rotary handle assembly is compact, easy to manufacture and economical as compared to the prior arts mentioned in the background section of the description.
[0039] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS:
[0040] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout

the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0041] Fig. 1 illustrates top view of the rotary handle assembly according to the preferred embodiment;
[0042] Fig. 2 illustrates bottom view of the rotary handle assembly according to the preferred embodiment;
[0043] Fig. 3 illustrates exploded view of the rotary handle assembly according to the preferred embodiment; and
[0044] Fig. 4 illustrates the locking mechanism provided on the rotary handle assembly according to the preferred embodiment.
[0045] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0046] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[0047] The terms "comprises", "comprising", or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or

inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by "comprises... a" does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.
[0048] Figures 1 and 2 illustrate a rotary handle assembly 100 for molded case circuit breaker (MCCB) to prohibit access to the molded case circuit breaker in ON or TRIP condition.
[0049] Referring to Figure 3, the rotary handle assembly 100 comprises of a rotary handle knob 101, which is provided to manually operate the molded case circuit breaker (MCCB). The rotary handle knob 101 is used to reset the molded case circuit breaker when it trips due to occurrence of unfavorable conditions. Further, rotary handle knob 101 is also used, in case the user wants to manually switch OFF the molded case circuit breaker (MCCB). User can change the operating condition of the molded case circuit breaker by rotating the rotary handle knob 101.
[0050] A rotary handle door 102 is provided below the rotary handle knob 101 to cover the molded case circuit breaker (MCCB). The rotary handle door 102 restricts access to the molded case circuit breaker (MCCB) in ON and TRIP condition. The rotary handle door 102 can only be open when the molded case circuit breaker is in OFF condition.
[0051] A defeat mechanism is provided to connect the rotary handle knob 101 with the operating handle of the molded case circuit breaker (MCCB). The defeat mechanism controls the opening and closing of the rotary handle door 102 in accordance with the operating state of the molded case circuit breaker (MCCB).
[0052] The rotary handle assembly 100 further has a bottom plate 106 provided below the defeat mechanism to maintain a distance between the molded case circuit breaker (MCCB) and the defeat mechanism. A rotary handle base 301 is provided between the rotary handle door 102 and the bottom plate 106 to cover the defeat mechanism.

[0053] The defeat mechanism has a plurality of slider pins 302 provided on a slider rotary handle 303. The slider rotary handle 303 has provisions on both sides to accommodate the plurality of slider pins 302. The slider pins 302 are accommodated in the slider rotary handle 303 by means of a bush 309a and springs (307b, 307c) which are provided adjacent to the bush 309a to restrict free motion of the slider rotary handle 303 on the slider pins 302 and to enable the engagement bar 304 to remain in engaged position with the rotary handle door 102 until the operating condition of the molded case circuit breaker (MCCB) is changed. Further, the slider rotary handle 303 has a provision provided on the bottom to accommodate the operating handle of the molded case circuit breaker.
[0054] The defeat mechanism further has an engagement bar 304 having its one end fixedly connected to slider rotary handle 303 by means of a handle plate pin 305. The handle plate pin 305 is fixedly attached to the top side of the slider rotary handle 303. The handle plate pin 305 synchronize the movement of engagement bar 304 with the slider rotary handle 303. Other end of the engagement bar 304 engages with the rotary handle door 102 to restrict the opening of the rotary handle door 102 when the molded case circuit breaker (MCCB) is in ON or TRIP condition.
[0055] A spring support 306 having a spring 307a is engaged with the fixed end of the engagement bar 304 to restrain free motion of the engagement bar 304.
[0056] The defeat mechanism further has a rotary handle punch 308 which connects the rotary handle knob 101 with the engagement bar 304. Any manual operation carried out by rotating the rotary handle knob 101 is transmitted to the engagement bar 304 through this rotary handle punch 308. The engagement bar 304 simultaneously transmit this manual operation to the operating handle of the molded case circuit breaker (MCCB) via. the slider rotary handle 303 to change the operating condition of the molded case circuit breaker.
[0057] An intentional trip button 105 is provided on the rotary handle assembly 100 to intentionally trip the molded case circuit breaker (MCCB). Further, a sliding button 107 is provided on the rotary handle base 301 which is directly

connected to the engagement bar 304 for manually disengaging the engagement bar 304 from the rotary handle door 102.
[0058] Referring to figure 4, a locking mechanism is provided on the rotary handle knob 101 to lock the rotation of rotary handle knob 101 while maintenance. The locking mechanism comprises a locking knob 103 provided on the rotary handle knob 101 and a knob slider 104 provided adjacent to the locking knob 103 wherein when the locking knob 103 is pressed downwards, the knob slider 104 slips down and engages with locking protrusions 401 provided on the rotary handle base 301 to restrict the rotation of the rotary handle knob 103.
[0059] During operation, the operating handle of the molded case circuit breaker is engaged with the provision provided on the bottom of the slider rotary handle 303. Any movement in operating handle of the molded case circuit breaker, due to change in operating condition, is passed on to the engagement bar 304 through slider rotary handle 303.
Condition 1
When user want to RESET the molded case circuit breaker after TRIP condition.
[0060] In TRIP condition, the operating handle of the molded case circuit breaker changes its positon from extreme end to middle. This change in position is transmitted to the engagement bar 304 through the slider rotary handle 303. Since, the trip position of the operating handle of the molded case circuit breaker is in the middle, the sliding of the engagement bar 304 is not enough to disengage the engagement bar 304 from the rotary handle door 102. Due to this the rotary handle door 102 remains locked even after the molded case circuit breaker trips. To reset the molded case circuit breaker (MCCB) user has to rotate the rotary handle knob 101 to OFF and then ON position. The rotary handle knob 101 transmits the rotating motion to the engagement bar 304 through the rotary handle punch 308 which simultaneously transmits the motion of the engagement bar 304 to the operating handle of the molded case circuit breaker (MCCB) through slider rotary

handle 303. There is no need to open the rotary handle door 102 to reset the molded case circuit breaker (MCCB) after TRIP condition.
Condition 2
When user wants to intentionally trip the molded case circuit breaker.
[0061] In case, user wants to intentionally trip the molded case circuit breaker (MCCB), an intentional trip button 105 is provided on the rotary handle assembly (100) to intentionally trip the molded case circuit breaker (MCCB). The RESET operation to bring the molded case circuit breaker in ON state is already discussed in condition 1 above.
Condition 3
When user wants to open the rotary handle door for maintenance.
a. Using sliding button 7
[0062] In case, user wants to open the rotary handle door for maintenance, a sliding button 107 is provided on the rotary handle base 301 which is directly connected to the engagement bar 304 for manually disengaging the engagement bar 304 from the rotary handle door 102. The sliding motion of the engagement bar 304 is transmitted to the operating handle of the molded case circuit breaker (MCCB) through slider rotary handle 303 which brings the molded case circuit breaker (MCCB) in OFF condition.
b. Using rotary handle knob 101
[0063] In case, user wants to open the rotary handle door for maintenance, user can rotate the rotary handle knob 101 which transmits the rotating motion of the rotary handle knob 101 to the engagement bar 304 through the rotary handle punch 308, which simultaneously transmits the sliding motion of engagement bar 304 to the operating handle of the molded case circuit breaker (MCCB) through slider rotary handle 303 which brings the molded case circuit breaker in OFF condition.

[0064] The rotary handle assembly according to the preset subject matter transfers the motion of the operating handle of the molded case circuit breaker to the rotary handle knob without any time lag. Thus, saving the molded case circuit breaker (MCCB) from potential damage.
[0065] The defeat mechanism of the rotary handle assembly according to the present subject matter does not let the rotary handle door to open in ON or TRIP condition.
[0066] Further, the intentional trip button provided on the rotary handle assembly solves the problem of opening the rotary handle door for intentional tripping.
[0067] Furthermore, the present rotary handle assembly is compact, easy to manufacture and economical as compared to the prior arts mentioned in the background section of the description.
[0068] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition,

even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
[0069] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof

also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of "comprising" or "including" also contemplates embodiments that "consist essentially of or "consist of the recited feature.

WE CLAIM:
1. A rotary handle assembly (100) for molded case circuit breaker (MCCB) to prohibit access to the molded case circuit breaker (MCCB) in ON and TRIP condition, the rotary handle assembly (100) comprises:
a rotary handle knob (101) to manually operate the molded case circuit breaker (MCCB);
a rotary handle door (102) provided below the rotary handle knob
(101) to cover the molded case circuit breaker (MCCB);
a defeat mechanism to connect the rotary handle knob (101) with operating handle of the molded case circuit breaker (MCCB), wherein the defeat mechanism controls the opening and closing of the rotary handle door (102) in accordance with the operating state of the molded case circuit breaker (MCCB);
a bottom plate (106) provided below the defeat mechanism to maintain distance between the molded case circuit breaker (MCCB) and the defeat mechanism; and
a rotary handle base (301) provided between the rotary handle door
(102) and the bottom plate (106) to cover the defeat mechanism;
characterized in that
the defeat mechanism comprises:
a plurality of slider pins (302);
a slider rotary handle (303) having provision on both sides to accommodate the plurality of slider pins (302), and at bottom to accommodate operating handle of the molded case circuit breaker (MCCB);

an engagement bar (304) having one end fixedly connected to the slider rotary handle (303) by means of a handle plate pin (305) engaged on the top side of the slider rotary handle (303) to move the engagement bar (304) along with the slider rotary handle (303) and other end of the engagement bar (304) engages with the rotary handle door (102) to restrict the opening of the rotary handle door (102), when the molded case circuit breaker (MCCB) is in ON or TRIP condition;
a spring support (306) having a spring (307a) engaged with the fixed end of the engagement bar (304) to restrain free motion of the engagement bar (304);
a rotary handle punch (308) to connect the rotary handle knob (101) with the engagement bar (304) for transmitting manual reset operation initiated by rotating the rotary handle knob (101) to the engagement bar (304), wherein the defeat mechanism restricts the opening of the rotary handle door (102) in ON and TRIP conditions.
2. The rotary handle assembly (100) as claimed in claim 1, wherein springs (307b, 307c) are provided on each of the plurality of slider pins (302) to facilitate the engagement of engagement bar (304) with rotary handle door (102).
3. The rotary handle assembly (100) as claimed in claim 1, wherein each of the plurality of sliding pins (302) are accommodated in the slider rotary handle (303) by means of a bush (309a), adjacent to the springs (307b, 307c) to facilitate the sliding motion of the slider rotary handle (303).
4. The rotary handle assembly (100) as claimed in claim 1, wherein the operating handle of the molded case circuit breaker (MCCB) engaged with the provision provided at the bottom of the slider rotary handle (303) in a way that, any movement in operating handle of the molded case circuit breaker (MCCB), due to change in state of operation, is pass on to the engagement bar (304).

5. The rotary handle assembly (100) as claimed in claim 4, wherein when the molded case circuit breaker (MCCB) TRIPS, the operating handle of the molded case circuit breaker (MCCB) moves to open the contacts and this movement of the operating handle is transmitted to the engagement bar (304) through the slider rotary handle (303) to slide the engagement bar (304) slightly but not enough to disengage the engagement bar (304) with the rotary handle door (102).
6. The rotary handle assembly (100) as claimed in claim 4, wherein the molded case circuit breaker (MCCB) is reset by manually rotating the rotary handle knob (101) due to which the rotating movement of the rotary handle knob (101) is transmitted to the engagement bar (304) through the rotary handle punch (308), which successively reset the molded case circuit breaker (MCCB) to ON condition, through the slider rotary handle
(303) engaged with the engagement bar (304).
7. The rotary handle assembly (100) as claimed in claim 1, wherein a trip button (105) is provided on the rotary handle assembly (100) to intentionally trip the molded case circuit breaker (MCCB).
8. The rotary handle assembly (100) as claimed in claim 1, wherein a sliding button (107) is provided on the rotary handle base (301) which is directly connected to the engagement bar (304) for manually disengaging the engagement bar (304) from the rotary handle door (102).
9. The rotary handle assembly (100) as claimed in claim 1, wherein the rotary handle punch (308) has a punch pin (310), handle plate (311) and a bush (309b) to connect the rotary handle knob (101) with the engagement bar
(304) for transmitting manual reset operation, initiated by rotating the
rotary handle knob (101), to the engagement bar (304).
10. The rotary handle assembly (100) as claimed in claim 1, wherein a locking
mechanism is provided on the rotary handle knob (101) to lock the rotation
of rotary handle knob (101) while maintenance.

11. The rotary handle assembly (100) as claimed in claim 10, wherein the locking mechanism comprises:
a locking knob (103) provided on the rotary handle knob (101);
a knob slider (104) provided adjacent to the locking knob (103) wherein when the locking knob (103) is pressed downwards, the knob slider (104) slips down and engages with locking protrusions (401) provided on the rotary handle base (301) to restrict the rotation of the rotary handle knob (103).