Description:TECHNICAL FIELD
[0001] The present disclosure relates generally to rotary operating mechanisms. In particular, the present disclosure relates to a rotary handle for circuit breakers.

BACKGROUND
[0002] 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.
[0003] Circuit Breakers (MCCBs) are electronic protection devices that make, carry and break currents under normal or abnormal conditions. Particularly, Moulded Case CBs (MCCBs) provide overload protection and short-circuit protection, including in low voltage distribution systems. Unlike switches or fuse units, MCCBs provide compactness, resilient and consistent performance, allow use of insulating materials, while also enable incorporation of new technologies such as solid-state microprocessor-based trip and control systems. Further, the flexibility of MCCB allows them to be adapted to an extensive variety of applications.
[0004] CBs may be configured with a rotary handle that move between any of the four operational positions, viz. ON, OFF, TRIP & RESET. Rotary handles provide greater clearance, and in-turn improve safety from the circuit. Further, rotary handles allow for easier visualization of the state of the CB. Rotary handles also allow for pad locking the position of the CBs.
[0005] However, existing rotary handles have limited range of motion, particularly in the linear direction, and often are unable to reliably allow operators to reset CBs when tripped. Most rotary handles engage with a knob associated with a CB such that when the knob trips, and consequently moves in a linear direction, it rotates the rotary handle. The rotary handle may then indicate the operational position the CB is in. Rotary handles may also be used to move the CBs between each of the operational positions. For instance, while the MCCB allows current to flow when in the ON position, the MCCB may trips when an abnormal flow of current is detected. During tripping, a latch link in the mechanism moves to a new position, preventing the breaker from being turned back on until it is reset. To reset the CB, the rotary handle may be turned to the RESET position that brings the latch link to its original position.
[0006] Typically, rotary handles use a Scotch Yoke mechanism for converting rotary motion to linear motion of the knob. The scotch yoke mechanism include a rotating element which governs the sliding motion of the knob. Conventional scotch yoke mechanism convert rotary motion to linear motion in a pure sine wave over time, due to which the rotary handle may not be able to reliably push the knob head of the CB to the RESET position, especially when the RESET position is configured to be at the ends of the knob’s range of motion. Range of movement of cam followers in the linear direction corresponding to movement of the knob head may be limited due to the sinusoidal motion of scotch yoke mechanisms of existing solutions. Further, existing CB designs may require the force to the translated in a variable manner, such as increasing or decreasing based on the specification and dimensions of the CB and the rotary handle. Existing rotary handles do not allow for the same.
[0007] There is, therefore, a need for a device that addresses the aforementioned shortcomings of existing solutions.

OBJECTS OF THE INVENTION
[0008] Some of the objects of the present disclosure, which at least one embodiment herein satisfies are listed herein below.
[0009] An object of the present disclosure is to provide a rotary handle for circuit breakers (CBs).
[0010] Another object of the present disclosure is to provide a rotary handle that variably converts rotary motion of rotary handles to linear motion of CB knob heads.
[0011] Another object of the present disclosure is to provide a rotary handle for CBs that allows switching between ON and OFF positions with symmetric angular rotation.
[0012] Another object of the present disclosure is to provide a rotary handle with increased linear motion of CB knob heads for given rotary motion compared to existing solutions.
[0013] Another object of the present disclosure is to provide a rotary handle that is adaptable for CBs of a plurality of specifications and dimensions by replacing a cam guiding surface.
[0014] The other objects and advantages of the present invention will be apparent from the following description when read in conjunction with the accompanying drawings, which are incorporated for illustration of the preferred embodiments of the present invention and are not intended to limit the scope thereof.

SUMMARY
[0015] Aspects of the present disclosure relates generally to rotary operated mechanisms. In particular, the present disclosure relates to a rotary handle for circuit breakers (CBs).
[0016] In an aspect, a rotary handle for CBs may include a pivotable cam having a cam follower slidably configured thereto to move towards or away from a pivot point of cam. The rotary handle may include a cam guiding surface having a contour that engages with the cam follower and guides said cam follower along a predetermined path when the cam may be caused to pivot, the predetermined path having at least one substantially linear path along which said cam follower may be moved. The cam may be reciprocally engaged with a handle and with a knob head of a CB via the cam follower such that the cam follower actuates the knob head to move in a linear direction when the cam may be actuated to pivot by a pivoting motion of the handle.
[0017] In an embodiment, the cam may be reciprocally engaged with a handle and with a knob head of a CB via the cam follower such that the cam actuates the handle to pivot when said cam follower may be actuated to move by a linear motion of the knob head.
[0018] In an embodiment, the cam follower may be actuated to move either by operably pivoting the handle or by linear motion of the knob head when the CB trips.
[0019] In an embodiment, the contours of the cam guiding surface may include an arcing portion, and a linear portion tangentially connected to the arcing portion such that said arcing portion guides the cam follower to move in a substantially curved path, and said linear portion guides the cam follower to move in a substantially linear path therefrom.
[0020] In an embodiment, the arcing portion guides the cam follower to move at a predetermined distance from the pivot point of the cam between a first end to a second end of the arcing portion, and the linear portion guides the cam follower to move such that the distance between said cam follower and the pivot point of the cam increases as said cam follower moves from a near end to a far end of the linear portion.
[0021] In an embodiment, the cam may include a spring that biases the cam follower towards the pivot point of the cam.
[0022] In an embodiment, the rotary handle may include a slider that may be slidably configured to one or more slider pins, the slider having a first cavity that engages with the cam follower and a second cavity that engages with the knob head such that said slider slides linearly on the one or more slider pins when actuated to slide by the knob head or the cam follower whereby the slider reciprocally actuates the cam follower or the knob head to move respectively.
[0023] In an embodiment, the CB may include a latch link and a latch bracket, which when connected, allow current to flow through the CB, the latch bracket being disconnected from the latch link by the CB when tripped such that the latch bracket opposably engages with the knob head.
[0024] In an embodiment, the latch bracket reconnects with the latch link when said CB may be reset by pivoting the handle such that the cam follower moves the knob head to disengage the latch bracket from the knob head, thereby allowing said latch bracket to engage with a surface on the latch link.
[0025] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0027] FIG. 1A-1B illustrate exemplary representations of a rotary handle for a circuit breaker, according to embodiments of the present disclosure.
[0028] FIG. 2 illustrates an exemplary cross-sectional view of the proposed rotary handle on a circuit breaker, according to embodiments of the present disclosure.
[0029] FIG. 3A-3B illustrates an exemplary representation of a cam and a cam follower of the rotary handle, according to embodiments of the present disclosure.
[0030] FIG. 4 illustrates an exemplary representation of a cam guiding surface of the proposed rotary handle, according to the embodiments of the present disclosure.
[0031] FIG. 5A-5B illustrate exemplary representations of a slider of the rotary handle, according to the embodiments of the present disclosure.
[0032] FIG. 6A-6B illustrate exemplary representations of the rotary handle in a first operational position, according to the embodiments of the present disclosure.
[0033] FIG. 7 illustrates an exemplary representation of the rotary handle in a second operational position, according to the embodiments of the present disclosure.
[0034] FIG. 8 illustrates an exemplary representation of the rotary handle in a third operational position, according to the embodiments of the present disclosure.
[0035] FIG. 9 illustrates an exemplary representation of the rotary handle in a fourth operational position, according to the embodiments of the present disclosure.
[0036] FIG. 10 illustrates an exemplary representation of the slider when the rotary handle is in the fourth operational position, according to the embodiments of the present disclosure.

DETAILED DESCRIPTION
[0037] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0038] Embodiments explained herein relate generally to rotary operating mechanisms. In particular, the present disclosure relates to a rotary handle for circuit breakers.
[0039] In an aspect, a rotary handle for CBs may include a pivotable cam having a cam follower slidably configured thereto to move towards or away from a pivot point of cam. The rotary handle may include a cam guiding surface having a contour that engages with the cam follower and guides said cam follower along a predetermined path when the cam may be caused to pivot, the predetermined path having at least one substantially linear path along which said cam follower may be moved. The cam may be reciprocally engaged with a handle and with a knob head of a CB via the cam follower such that the cam follower actuates the knob head to move in a linear direction when the cam may be actuated to pivot by a pivoting motion of the handle. In an embodiment, the cam may be reciprocally engaged with a handle and with a knob head of a CB via the cam follower such that the cam actuates the handle to pivot when said cam follower may be actuated to move by a linear motion of the knob head.
[0040] FIG. 1A-1B illustrate exemplary representations of a rotary handle 110 for a CB 140, according to embodiments of the present disclosure. As shown, the rotary handle 110 may include a handle 134 that may indicate the position of a knob head 111 of the CB 140. The handle 134 may also be manually operated to move the knob head 111 between any one of one or more operational positions of the knob head 111.
[0041] In an embodiment, the rotary handle 110 may be fastened to the CB 140. In an embodiment, the rotary handle 110 may be fastened using including, but not limited to, screws, bolts, nails, welding, adhesives, and the like. In an embodiment, the CB 140 may be indicative of a Moulded Case CB (MCCB). In an embodiment, the CB 140 may have a knob head 111 (as shown in FIG. 2) associated thereto. In an embodiment, the position of the knob head 111 may be in any one of the one or more operational positions that the CB 140. In an embodiment, the handle 134 may be reciprocally engaged with the knob head 111 such that the orientation of the handle 134 may indicate the position of the knob head 111. In an embodiment, the one or more operational positions may include, but not be limited to, ON, OFF, TRIP or RESET. In an embodiment when the knob head 111 is in the first operational position indicative of the ON position, the CB 140 may allow the normal flow of current therethrough. In an embodiment when the knob head 111 is in the second operational position indicative of the OFF position, the CB 140 may reversibly prevent the normal flow of current therethrough. In an embodiment when the knob head 111 is in the third operational position indicative of the TRIP position, the CB 140 may indicate an incidence of abnormal flow of current, and may reversibly prevent the CB 140 from being returned to the ON position. In such examples, the knob head 111 may be pushed to the fourth operational position indicative of the RESET position such that the knob head 111 can be returned to the ON position. In an embodiment, the knob head 111 may be moved between each of the four operational positions by rotating the handle 134. In such embodiments, the knob head 111 and the handle 134 may be reciprocally engaged via the cam 116.
[0042] In an embodiment, the CB 140 may include a latch link 142 and a latch bracket 144 (as shown in FIG. 2), which may allow a current to flow through the CB 140 when connected. In an embodiment, the latch link 142 and the latch bracket 144 may be disconnected when the CB 140 trips due to incidences of abnormal flow of currents therebetween. In an example, the CB 140 may trip and separate the latch link 142 and the latch bracket 144 when experiencing overload and short-circuit. In such embodiments, the latch bracket 144 may prevent the knob head 111 to be moved to the ON position when said latch bracket 144 may be reversibly detached from the latch link 142. In such embodiments, the latch bracket 144 may opposably engage with the knob head 111 such that said knob head 111 is prevented from moving to the ON position.
[0043] In an embodiment, the rotary handle 110 may be configured to the CB 140 such that said rotary handle 110 can indicate the position of the knob head 111. One or more orientations of the handle 134 associated with the rotary handle 110 may correspond to each of the operational positions of the CB 140.
[0044] The rotary handle may include a pivotable cam 116 having a cam follower 120 slidably configured thereto, as illustrated in FIGs. 2, 3A and 3B. In an embodiment, the cam 116 may be reciprocally engaged with the handle 134 such that pivoting the handle 134 causes the cam 116 to pivot correspondingly, and vice-versa. In an embodiment, the cam 116 may include slot cavity 117 configured to receive the cam follower 120, and allow said cam follower 120 to slide thereabout. In an embodiment, the cam follower 120 may be configured to move towards or away from the pivot point of the cam 116. Further, the cam follower 120 may include a disc structure 122 configured to securely fit into the slot cavity 117.
[0045] In an embodiment, the cam follower 120 may be configured to slide along a contour of a cam guiding surface 126, as illustrated in FIG. 4. In an embodiment, the cam follower 120 may engage with and move along the contours of the cam guiding surface 126. In an embodiment, the cam guiding surface 126 may be placed between the cam 116 and the CB 140. In an embodiment, the handle 134 may be configured by the hole 127 to the cam 116, and may rotate with said hole 127 as the pivot point. In an embodiment, the cam follower surface 123 may be configured to engage with the contours of the cam guiding surface 126. In an embodiment, the cam guiding surface 126 may be indicative of a plate having one or more paths defined therein. In an embodiment, the cam follower 120 may be actuated to move by rotating the handle 134 reciprocally associated with the cam 116. In an embodiment, the cam guiding surface 126 may be contoured to guide the cam follower 120 along a predetermined path as the rotating element 116 is rotated. In an embodiment, the predetermined path may have at least one substantially linear path along which said cam follower 120 may be moved. In an embodiment, the cam guiding surface 126 may have an arcing portion 128 having a substantially curved contour, and a linear portion 129 having a substantially linear contour.
[0046] In an embodiment, the cam follower surface 123 of the cam 116 may engage with the arcing portion 128 and the linear portion 129, thereby causing the cam follower 120 to move along the contours of said arcing portion 128 and the linear portion 129. In an embodiment, the contours of the cam guiding surface 126 may ensure the cam 116 travels in the predetermined path and prevents slippages therefrom. The contours of the cam guiding surface 126 may be suitably adapted to move the cam follower 120 in a plurality of paths. In an embodiment, the contours of the cam guiding surface 126 may be configured to maximize length of the linear movement of the cam follower 120 for corresponding to rotational movement of the handle 134. In an embodiment, the contours of the cam guiding surface 126 may be suitably adapted for implementations in CBs 140 of a plurality of specifications and configurations.
[0047] In an embodiment, the cam follower 120 may be actuated to move either by operably pivoting the handle 134. In some embodiment, an operator may manually operate, and pivot, the handle to actuate motion of the cam follower 120 via the cam 116. In other embodiments, the handle 134 may be controllably operated using a remote electronic device. In other embodiments, the cam follower 120 may be actuated to move by the linear motion of the knob head 111 when the CB 140 trips.
[0048] The rotary handle 110 may include a slider 112 slidably configured to one or more slider pins 113 as shown in FIGs. 2, 5A and 5B. In an embodiment, the slider 112 may be configured to slide along one or more sliding pins 113. In an embodiment, the sliding pins 113 may have a substantially cylindrical contour. In other embodiments, the sliding pins 113 may be indicative of an elongated structure having a prismatic contour.
[0049] In an embodiment, the cam follower 120 may be received by a first cavity 115 of the slider 112. In an embodiment, the cam follower 120 may be configured to engage with the first cavity 115 of the slider 112. In an embodiment, the slider 112 may include a second cavity 114 that receives the knob head 111. The slider 112 may slide linearly on the one or more slider pins 113 when actuated to slide by the knob head 111 or the cam follower 120 whereby the slider 112 reciprocally actuates the cam follower 120 or the knob head 111 to move respectively. In some embodiments, the cam follower 120 may cause the slider 112 to move along the slider pins 113 when said cam follower 120 is actuated to move the cam 116 pivots. The cam 116 may be pivoted by rotating the handle 134. In other embodiments, tripping of the CB 140 may cause the knob head 111 to move whereby the slider 112 may be moved linearly along the slider pins 113 and in-turn cause the cam follower 120 to move along the contours of the cam guiding surface 126 in a respective direction. The cam follower 120 may cause the cam 116 to pivot, which may in-turn cause the handle 134 to rotate to an orientation that indicates the operational position of the knob head 111. In an example, the slider 112 may be moved in a first direction when the cam follower 120 is brought to the fourth operational position, as shown in FIG. 10.
[0050] FIGs. 6A to 9 illustrate the movement of the cam follower 120 along the cam guiding surface 126. FIG. 6A illustrates an embodiment where the cam follower surface 123 is in ON position. In such embodiments, the cam follower 120 may be positioned to be on a first end of the arcing portion 128 of the cam guiding surface 126. When in the ON position, the CB 140 may allow normal flow of current therethrough. In an embodiment, the cam follower 120 may be prevented from moving beyond the first end of the arcing portion 128 by an abutment. In an example, the distance between the cam follower 120 and the hole 127 may be about 14.85 mm. Further, in such examples, the distance between the cam follower 120 and the hole 127 may be constant while said cam follower 120 moves from the first end to a second end of the arcing portion. In such examples, the angle between the first end and the second end of the arcing portion 128 with respect to the hole 127 may be about 120 degrees.
[0051] FIG. 7 illustrates an embodiment where the cam follower 120 is in the OFF position. In such embodiments, the cam follower 120 may be positioned to be on the second end of the arcing portion 128 of the cam guiding surface 126. When in the OFF position, the CB 140 may prevent normal flow of current therethrough. In an embodiment, the cam follower 120 may be moved from the first end to the second end of the arcing portion 128 by rotating the rotating handle 134. In an embodiment, the arcing portion 128 may allow for symmetric angular rotation as the cam follower 120 moves between the ON position and the OFF position.
[0052] FIG. 8 illustrates an embodiment where the cam follower 120 is in the TRIP position. In an embodiment, the cam follower 120 may be in the TRIP position when said cam follower 120 is between the first end and the second end of the arcing portion 128. In an example, the cam follower 120 may be moved to the TRIP position when said cam follower surface 123 is about equidistant from the first end and the second end of the arcing portion 128. In other examples, the angle between the first end and the TRIP position on the arcing portion 128 with respect to the pivot point may be about 60 degrees.
[0053] In an embodiment, the CB 140 may be configured to move the knob head 111, and correspondingly the cam follower 120, to the third operational position, indicative of the TRIP position, when said CB 140 is tripped due to abnormal flow of current. In such embodiments, the latch bracket 144 may be disconnected from the latch link 142. Further, the latch bracket 144 may be moved to a position where said latch bracket 144 opposably engages with the knob head 111 whereby said knob head 111 may be prevented from moving to the first operational position, indicative of the ON position. In an embodiment, when the knob head 111 is moved to the third operational position by the CB 140, the cam follower 120 may be correspondingly be moved by the knob head 111 to the TRIP position, as shown in FIG. 8. The cam follower 120 may pivot the cam 116, and in-turn the handle 134, such that the handle 134 indicates to the operators that the CB 140 may be tripped.
[0054] The handle 134 may be moved to the fourth operational position, indicative of the RESET position, for resetting the CB 140 so as to resume current to flow through the CB 140. In such embodiments, the latch bracket 144 may be allowed to move and reconnect with the latch link 142 by rotating the handle 134 to the fourth operational position. In an embodiment, by rotating the rotating handle 134 beyond the second end of the arcing portion 128, the cam follower 120 may be caused to move along the linear portion 129 of the cam guiding surface 126 to move the knob head 111 to the RESET position, as shown in FIG. 9. In an embodiment, causing the cam follower 120 to move along the linear portion 129 may increase the distance between said cam follower 120 and the hole 127. In an example, as the cam follower 120 is moved from a near end of the linear portion 129 to a far end of the linear portion 129, the distance between the cam follower 120 and the hole 127 may gradually increase from about 14.85mm to about 21mm. Further, as shown in FIG. 6B, the cam follower 120 may be biased towards the pivot point by a spring 125. In such embodiments, the cam follower 120 may be biased to return to the near end of the linear portion 129 or the arcing portion 128.
[0055] In an embodiment, the cam guiding surface 126 may be configured to prevent the cam follower 120 to move beyond the far end of the linear portion 129 thereof. In an embodiment, the housing of the rotary handle 110 may include a corresponding abutment that prevents the cam follower 120 to move beyond the far end. In an example, the abutment may be configured such that the cam follower 120 may be prevented from moving further on the linear portion 129 when the distance between said cam follower 120 and the hole 127 is about 21mm. In an embodiment, the cam follower 120 may be in the RESET position when at the far end of the linear portion 129. In embodiments where the CB 140 is tripped, the CB 140 may prevent the knob head 111 to be moved to the ON position, until said knob head 111 is brought to the RESET position.
[0056] In an embodiment, the latch bracket 144 may reconnect with the latch link 142 when said CB 140 may be reset by pivoting the handle 134 such that the cam follower 120 moves the knob head 111 to disengage the latch bracket 144 from the knob head 111 and allowing said latch bracket 144 to engage with a surface on the latch link 142. In an embodiment, moving the knob head 111 to the RESET position may allow the latch bracket 144 to disengage from the knob head 111 and reconnect with the latch link 142. Thereafter, the knob head 111 may be allowed to be moved to the ON position. In an embodiment, the knob head 111 may be moved to the RESET position by rotating the handle 134. On being reset and brought to the ON position, the CB 140 may allow normal flow of current therethrough.
[0057] The rotary handle 110 of the present disclosure may allow the cam follower 120 to reliably move the knob head 111 to the RESET position. In an embodiment, the contours of the cam guiding surface 126 may provide increased range of movement in the linear direction for the cam follower 120, thereby ensuring that the knob head 111 is pushed so as to allow the latch bracket 144 to reconnect with the latch link 142. The contours of the cam guiding surface 126 may be suitably adapted to vary the displacement and force of the cam follower 120 in the linear direction based on use requirements.
[0058] Therefore, the present disclosure solves the aforementioned problems of the existing solutions.
[0059] 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 OF THE INVENTION
[0060] The present disclosure provides a rotary handle for circuit breakers (CBs).
[0061] The present disclosure provides a rotary handle that variably converts rotary motion of rotary handles to linear motion of CB knob heads.
[0062] The present disclosure provides a rotary handle for CBs that allows switching between ON and OFF positions with symmetric angular rotation.
[0063] The present disclosure provides a rotary handle with increased linear motion of CB knob heads for given rotary motion compared to existing solutions.
[0064] The present disclosure provides a rotary handle that is adaptable for CBs of a plurality of specifications and dimensions.
, Claims:1. A rotary handle (110) for circuit breakers (CBs) (140), comprising:
a pivotable cam (116) having a cam follower (120) slidably configured thereto to move towards or away from a pivot point of cam (116); and
a cam guiding surface (126) having contour that engages with the cam follower (120) and guides said cam follower (120) along a predetermined path when the cam (116) is caused to pivot, the predetermined path having at least one substantially linear path along which said cam follower (120) is moved, wherein the cam (116) is reciprocally engaged with a handle (134) and with a knob head (111) of a CB (140) via the cam follower (120) such that the cam follower (120) actuates the knob head (110) to move in a linear direction when the cam (116) is actuated to pivot by a pivoting motion of the handle (134).

2. The rotary handle (110) as claimed in claim 1, wherein the cam (116) is reciprocally engaged with the handle (134) and with the knob head (111) of the CB (140) such that the cam (116) actuates the handle (134) to pivot when said cam follower (120) is actuated to move by a linear motion of the knob head (110).

3. The rotary handle (110) as claimed in claim 1, wherein the cam follower (120) is actuated to move either by operably pivoting the handle (134) or by linear motion of the knob head (111) when the CB (140) trips.

4. The rotary handle (110) as claimed in claim 1, wherein the contours of the cam guiding surface (126) comprises an arcing portion (128), and a linear portion (129) tangentially connected to the arcing portion (128) such that said arcing portion (128) guides the cam follower (120) to move in a substantially curved path, and said linear portion (129) guides the cam follower (120) to move in a substantially linear path therefrom.
5. The rotary handle (110) as claimed in claim 4, wherein the arcing portion (128) guides the cam follower (120) to move at a predetermined distance from the pivot point of the cam (116) between a first end to a second end of the arcing portion (128), and the linear portion (129) guides the cam follower (120) to move such that the distance between said cam follower (120) and the pivot point of the cam (116) increases as said cam follower (120) moves from a near end to a far end of the linear portion (129).

6. The rotary handle (110) as claimed in claim 1, wherein the cam (116) comprises a spring (125) that biases the cam follower (120) towards the pivot point of the cam (116).

7. The rotary handle (110) as claimed in claim 1, wherein the rotary handle (110) comprises a slider (112) that is slidably configured to one or more slider pins (113), the slider (112) having a first cavity that engages with the cam follower (120) and a second cavity that engages with the knob head (111) such that said slider (112) slides linearly on the one or more slider pins (113) when actuated to slide by the knob head (111) or the cam follower (120) whereby the slider (112) reciprocally actuates the cam follower (120) or the knob head (111) to move respectively.

8. The rotary handle (110) as claimed in claim 1, wherein the CB (140) comprises a latch link (142) and a latch bracket (144), which when connected, allow current to flow through the CB (140), the latch bracket (144) being disconnected from the latch link (142) by the CB (140) when tripped such that the latch bracket (144) opposably engages with the knob head (111).

9. The rotary handle (110) as claimed in claim 8, wherein the latch bracket (144) reconnects with the latch link (142) when said CB (140) is reset by pivoting the handle (134) such that the cam follower (120) moves the knob head (111) to disengage the latch bracket (144) from the knob head (111), thereby allowing said latch bracket (144) to engage with a surface on the latch link (142).