Claims:1. A plug-in box comprising:
a rotor assembly (102) comprising a rotor (112) and an interface plate (220) that is configured with an interface plate cavity (224);
an MCCB (104); and
a mounting plate (108), wherein the MCCB (104) and the rotor assembly (102) are mounted on the mounting plate (108), and wherein the interface plate cavity (224) is configured to hold switch (106) of the MCCB (104) such that external rotary movement given to the rotor (112) of the rotor assembly (102) is translated into linear movement of the interface plate cavity (224) to operate the switch (106), and wherein position and linear travel of the interface plate cavity (224) is adjustable based on the switch (106) of the MCCB (104) to enable different MCCBs (104) to be used in the plug-in box.

2. The plug-in box of claim 1, wherein the MCCB (104) and the rotor assembly (102) are mounted on the mounting plate (108) using mounting holes (110).
3. The plug-in box of claim 1, wherein the rotor (112) is operatively coupled with at least one actuation means that is capable of being actuated in order to switch the MCCB (104) ON or OFF.
4. The plug-in box of claim 1, wherein the rotor assembly (102) comprises at least one side, wherein the side further comprises the rotor (112), a connector, and a latch.
5. The plug-in box of claim 1, wherein the rotor assembly (102) comprises a left side and a right side, wherein the left side comprises the rotor (112/246), a left connector (206), and a left latch (214), and wherein the right side comprises the rotor (112/240), a right connector (232), and a right latch (226).
6. The plug-in box of claim 5, wherein the left latch (214) is connected to the right latch (226) by means of the interface plate (/220).
7. The plug-in box of claim 5, wherein the left rotor (112/246) has a mounting step 202 configured to form a datum for the rotation axis of the rotor assembly (102), and wherein the left rotor (112/246) has alignment holes (204)for positioning the left connector(206) for connecting with the left rotor(112/246), and wherein the left connector (206)has one or more latch alignment holes (210)for positioning and connecting the left latch (214)with itself.
8. The plug-in box of claim 5, wherein the right rotor (112/240) has a mounting step 242 configured to form a datum for the rotation axis of the rotor assembly (102), and wherein the right rotor (112/240) has alignment holes (244)for positioning the right connector(232) for connecting with the right rotor(112/240), and wherein the right connector (232)has one or more latch alignment holes (236)for positioning and connecting the right latch (226)with itself.
9. A rotor assembly (102) comprising a rotor (112) and an interface plate that is configured with an interface plate cavity, wherein the interface plate cavity is configured to holds switch (106) of a MCCB (104) such that external rotary movement given to the rotor (112) of the rotor assembly (112) is translated into linear movement of the interface plate cavity to operate the switch (106), and wherein position and linear travel of the interface plate cavity is adjustable based on the switch (106) of the MCCB to enable different MCCBs (104) to be used in the plug-in box.
10. The rotor assembly (102) of claim 9, wherein the rotor assembly (102) and the MCCB (104) are mounted on a mounting plate.
, Description:TECHNICAL FIELD
[0001] The present disclosure relates to the field of electric power distribution. More particularly the present disclosure relates to plug-in units and boxes thereof as are used in electric busways.

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] Electric busways and plug-in units to tap power from them are well known in the art. Plug-in units for tapping electrical power from busway systems have undergone a continuing program to improve the ease and safety with which the apparatus may be mounted and electrically plugged into the bus duct. To eliminate the need to familiarize installation and maintenance personnel with several different attachment instructions and techniques, manufactures of busway equipment find it desirable to standardize on the mounting means and method throughout their entire line. However, the vast range of physical sizes of the apparatus render such standardization more difficult and in certain instances designs necessary for mounting physically large and cumbersome units are quite superfluous for the smaller units of the line.
[0004] The disadvantage of this non-standardisation is all the more acutely felt in case of plug-in units as elaborated herein. Plug-in units are enclosed boxes configured with an MCCB (moulded case circuit breaker) that has to be operated by external means without opening the plug-in unit box for obvious safety considerations. The actuation of the on-off button of the MCCB needs to be derived from elements within the plug-in unit enclosure, but reachable by a user from outside the box. Hence, a plug-in unit is designed to work only with a certain MCCB and it can not accommodate other MCCBs since the position and linear motion of the on-off switches of the two MCCBs could vary depending upon their type and manufacturer.
[0005] But, a plug-in unit commonly requires changing the MCCB within. This could be because an existing MCCB has failed. It could also be because the system requirements have changed and an MCCB with higher or lower ratings now needs to be put in that plug-in unit. Due reasons explained above, such a change is not easily done. Typically, one is restricted to MCCBs of the same rating and/or same manufacture as originally installed since other MCCBs may be incompatible with the configuration such as dimensions, linkages etc. of the existing switching mechanism the plug-in unit is designed with.
[0006] Hence there is a need in the art for a mechanism that easily enables MCCBs of different manufacturers and/or sizes to be used in the box of a plug-in unit, without any change in its internal components.
[0007] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[0008] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
[0009] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0010] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0011] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. one or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all markush groups used in the appended claims.

OBJECTS OF THE INVENTION
[0012] It is the object of the present disclosure to provide for a rotor assembly for a plug-in box that enables the plug-in box to accommodate and use moulded case circuit breakers (MCCBs) of different types, sizes and manufacture.
[0013] Another object of the present disclosure is to provide for a rotor assembly for a plug-in box wherein moulded case circuit breakers (MCCBs) of different types, sizes and manufacture can be used without changing any part of the plug-in box.
[0014] Another object of the present disclosure is to provide for a rotor assembly for a plug-in box wherein moulded case circuit breakers (MCCBs) of different types, sizes and manufacture can be interchanged quickly and easily.

SUMMARY
[0015] The present disclosure relates to the field of electric power distribution. More particularly the present disclosure relates to plug-in units and boxes thereof as are used in electric busways.
[0016] In an aspect, a rotor assembly for a plug-in box is disclosed, wherein the rotor assembly can include an interface plate configured with an interface plate cavity, wherein the cavity can be engaged with on-off button of an MCCB.
[0017] In another aspect, the interface plate can have means to vary the position and travel of the interface plate cavity according to that of the on-off button of the MCCB in order to switch the MCCB ON and OFF.
[0018] In an aspect, means provided with the interface plate can include a rotor configured to be connected to external actuation means; a connector operatively attached to the rotor; and a latch operatively attached to the connector and the interface plate, wherein the position of the interface plate, the latch and the connector can be varied with respect to each other and the rotor.
[0019] In another aspect, the operative attachment of the connector to the rotor and that of the latch to the connector and the interface plate can be by means of holes, slots and fasteners that can hold the interface plate, the latch and the connector in different positions with respect to each other and the rotor.
[0020] In an aspect, present disclosure provides for a rotor assembly for a plug-in box that enables the plug-in box to accommodate and use MCCBs of different sizes, types and manufacturers, their switching being done externally. The rotor assembly has a rotor actuated by external means and an interface plate with a cavity that holds on-off switch of the MCCB being used in the plug-in box. External rotary movement given to the rotor assembly is translated into linear movement of the interface plate and cavity within to operate the MCCB switch.
[0021] In another aspect, the interface plate is connected to the rotor by means of a connector and a latch. All the components have means to vary their position with respect to each other. In an exemplary embodiment, such means can include alignment holes and slots that are used with fasteners to couple the components of the rotor assembly.
[0022] In another aspect, by adjusting the position of the various components by means of alignment holes and slots, position and linear travel of the interface plate can be adjusted according to that of MCCB switch and so different MCCBs can be used in the plug-in box.
[0023] Various objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like features.

BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 illustrates an overall view of a rotor assembly used in an exemplary embodiment of the present disclosure and its usage.
[0025] FIG. 2 illustrates various components of rotor assembly disclosed and how it can be configured to accommodate different MCCBs
[0026] FIG. 3 illustrates a generic exploded view of rotor assembly disclosed.
[0027] FIGs. 4A and 4B, and FIGs. 5A and 5B illustrate how a plug-in box configured with the rotor assembly disclosed can accommodate different MCCBs in accordance with an exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION
[0028] 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.
[0029] If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0030] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those of ordinary skill in the art. Moreover, all statements herein reciting embodiments of the invention, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure).
[0031] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[0032] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0033] The term ‘bus bar’ as used herein refers to a conductor that serves as a common connection for two or more circuits. Bus bars are mostly made aluminium or copper.
[0034] The term ‘busway’ as used herein refers to prefabricated electrical distribution system consisting of bus bars in a protective enclosure, including straight lengths, fittings, devices, and accessories. Busway includes bus bars, an insulating and/or support material, and a housing.
[0035] The term ‘plug-in unit’ or ‘tap-off box’ as used herein refers to an electrical assembly used in busways to tap electricity from the busbars therein. These install directly over the busbars in a busway system to get input electricity, output being directed to another bus way system or cables to various electrical equipment. Isolation and / or short circuit protection is provided by circuit breakers – usually Moulded Case Circuit Breakers (MCCBs).
[0036] The term ‘plug-in box’ as used herein refers to an enclosure of a plug-in unit.
[0037] The term ‘travel’ or ‘linear travel’ as used herein refers the distance the on-off switch of an MCCB has to be moved to switch on or off the MCCB.
[0038] The present disclosure relates to the field of electric power distribution. More particularly the present disclosure relates to plug-in units and boxes thereof as are used in electric busways.
[0039] In an aspect, a rotor assembly for a plug-in box is disclosed, wherein the rotor assembly can include an interface plate configured with an interface plate cavity wherein the cavity can be engaged with on-off button of an MCCB.
[0040] In another aspect, the interface plate can have means to vary the position and travel of the interface plate cavity according to that of the on-off button of the MCCB in order to switch the MCCB on and off.
[0041] In an aspect, the means provided with the interface plate can include a rotor configured to be connected to external actuation means; a connector operatively attached to the rotor; and a latch operatively attached to the connector and the interface plate, wherein the position of the interface plate, the latch and the connector can be varied with respect to each other and the rotor.
[0042] In another aspect, the operative attachment of the connector to the rotor and that of the latch to the connector and the interface plate can be by means of holes, slots and fasteners that can hold the interface plate, the latch and the connector in different positions with respect to each other and the rotor.
[0043] In an aspect, present disclosure provides for a rotor assembly for a plug-in box that enables the plug-in box to accommodate and use MCCBs of different sizes, types and manufacturers, their switching being done externally. The rotor assembly has a rotor actuated by external means and an interface plate with a cavity that holds on-off switch of the MCCB being used in the plug-in box. External rotary movement given to the rotor assembly is translated into linear movement of the interface plate and cavity within to operate the MCCB switch.
[0044] In another aspect, the interface plate is connected to the rotor by means of a connector and a latch. All the components have means to vary their position with respect to each other. In an exemplary embodiment, such means can include alignment holes and slots that are used with fasteners to couple the components of the rotor assembly.
[0045] In another aspect, by adjusting the position of the various components by means of alignment holes and slots, the position and linear travel of the interface plate can be adjusted according to that of MCCB switch and so different MCCBs can be used in the plug-in box.
[0046] Various objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like features.
[0047] FIG. 1 illustrates an overall view of a rotor assembly used in an exemplary embodiment of the present disclosure and its usage
[0048] In an aspect, the invention disclosed can include a rotor assembly 102 that can be mounted on a mounting plate 108 using mounting holes 110. The rotor assembly 102 can be configured inside a plug-in box (not shown) and can be used to switch ON or OFF an MCCB 104 that the plug-in box holds. MCCB 104 can be affixed to mounting plate 108 using the mounting holes 110.The ON-OFF switch 106 (also named MCCB button hereinafter) of MCCB 104 can be held in a cavity of rotor assembly as shown. Rotor 112 of the rotor assembly 102 can be operatively connected to a handle (not shown) outside the plug-in box that can be turned to switch MCCB 104 ON or OFF. The rotor assembly 102 can translate the rotating motion of the handle to an up or down movement that is imparted to MCCB switch 106 to switch it on or off. Besides, as explained in detail hereunder, position of various components of rotor assembly 102 can be varied to adjust to different types, sizes and manufacturers of MCCB 104 and switch them on or off as required.
[0049] FIG. 2 illustrates various components of rotor assembly 102 and how it can be configured to accommodate different MCCBs.
[0050] In an aspect, rotor assembly 102 can include on a side (that can be called left side), a left rotor 246, a left connector206, and a left latch 214.
[0051] In another aspect, rotor assembly 102 can include on an opposite side (that can be called right side), a right latch 226, a right connector 232 and a right rotor 240.
[0052] In another aspect, left latch 214 can be connected to right latch 226 by means of an interface plate 220 that can have an interface plate cavity 224 that can hold the protruding on-off button 106 of the MCCB 104.
[0053] In another aspect, rotor assembly 102 can be mounted inside the plug-in box on an axis created by features within the plug-in unit.
[0054] In another aspect, left rotor 246 can have a mounting step 202 that can form the the datum for the rotation axis of rotor assembly 102. The left rotor 246 can have alignment holes 204 for positioning the left connector 206. The left connector 206 can be connected to the left rotor 246, and can have alignment holes 208 for positioning itself with respect to the left rotor 246. The left connector 206 can also have latch alignment holes 210 for positioning and connecting the left latch 214 with itself. The left latch 214 can have an array of alignment holes 216 for positioning itself with respect to the left connector 206. The left latch 214 can also have alignment slots 218 for connecting with the interface plate 220.
[0055] In a similar fashion, right rotor 240 can have a mounting step 242 that can form the datum for the rotation axis of rotor assembly 102. The right rotor 240 can have alignment holes 244 for positioning the right connector 232. The right connector 232 can be connected to the right rotor 240, and can have alignment holes 234 for positioning itself with respect to the right rotor 240. The right connector 232 can also have latch alignment holes 236 for positioning and connecting the right latch 226 with itself. The right latch 226 can have an array of alignment holes 228 for positioning itself with respect to the right connector 232. The right latch 226 can also have alignment slots 230 for connecting the interface plate 220.
[0056] In an aspect all components can be connected to other relevant ones as described herein by means of fasteners that can be provided to hold them together via the holes in them.
[0057] The purpose of rotor assembly 102 is to enable operation of an MCCB assembled on mounting plate 108 in the plug-in box by means external to the plug-in box. To achieve this, interface plate 220 can be removed by removing the fasteners connecting the interface plate 220 to the right latch 226 and left latch214. An MCCB 104 can then be affixed on the mounting plate108 by matching mounting holes 110 to those in MCCB 104. The interface plate 220 can be placed over the MCCB 104 in such a fashion that MCCB button 106 can pass through the interface plate cavity 224. The alignment slots 222-1 and 222-2 in the interface plate 220 can be aligned with the alignment slots 218 of left latch 214 and alignment slots 230 of the right latch 226 respectively in such a fashion that the lower end of the interface plate cavity 224 touches the lower end of the MCCB button 106. The interface plate 220 can then be fastened to left latch 214 and right latch 226, using fasteners. The joining of rotor assembly to MCCB 104 is now complete.
[0058] To operate the MCCB 104, rotor 246 can be rotated along its rotation axis through external actuation. This motion of rotor 246 can create an upward or downward motion of interface plate 220 in whose cavity 224 MCCB button 106 is held.Accordingly MCCB button 106 can move up or down causing MCCB 104 to be switched on or off. In a similar fashion, if needed, rotor 240 can be rotated to switch MCB 104 on or off.
[0059] In an aspect, the position of interface plate 220 and interface plate cavity 224 within can be varied to fit position of a variety of MCCB buttons and consequently MCCBs. To achieve this, the position of the left latch 214 can be varied by connecting the rotor 246 with a different set of the alignment holes from the array of alignment holes 216 in the latch 214. Likewise, the position of the right latch 226 can be varied. Further, the position of the interface plate 220(and hence the interface plate cavity 224 therein) can be varied with respect to the left latch 214 and right latch 226 by sliding the fastener connecting them over the alignment slots 222-1 and 222-2. In this fashion, the combinations of these two movements can yield plural positions of interface plate cavity 224 that can then engage with a variety of the MCCB buttons and MCCBs. Accordingly the plug-in box can be configured to work with a plurality of MCCBs of different types, sizes and manufacture.
[0060] FIG. 3 illustrates a generic exploded view of rotor assembly disclosed.
[0061] As shown rotor assembly 102 can be configured in such a fashion that left rotor 246, left connector motion axis 212, right connector motion axis 238 and right rotor 240 are aligned on the same axis shown as 302 that can be the rotation axis of rotor assembly 102. This ensures that all other components of rotor assembly 102 in turn align properly and interface plate 220 can impart linear motion correctly to MCCB switch 106 whenever rotor 246 or rotor 240 are provided appropriate rotary motion.
[0062] FIGs. 4A and 4B, and FIGs. 5A and 5B illustrate how a plug-in box configured with the rotor assembly disclosed can accommodate different MCCBs in accordance with an exemplary embodiment of the present disclosure.
[0063] FIG. 4A and FIG. 4B illustrate how rotor assembly 102 can be configured to provide ON or OFF motion to MCCB switch 404 of an MCCB 402 of a type, say type-1. An alignment slot 218 of left latch 214 and another alignment slot 230 of right latch 226 is fastened to left alignment slot 222-1 and right alignment slot 222-2 respectively configured on interface plate 220 in accordance with position and linear travel requirement of MCCB switch 402. As shown, left alignment slot 222-1 and right alignment slot 222-2 can match with alignment slot 218 of left latch 214 and another alignment slot 230 of right latch 226 with no adjustment required. FIG. 4A illustrates ON condition and FIG. 4B OFF condition of MCCB 402 of type-1.
[0064] FIG. 5A and FIG. 5B illustrate how rotor assembly 102 can be configured to provide on or off motion to another MCCB switch 504 of an MCCB 502 of another type, say type-2; wherein position and linear travel of 504 can be different from that of 404. In this case, as shown, the fastening of left alignment slot 222-1 and right alignment slot 222-2 on interface plate 220 to alignment slot 218 of left latch 214 and alignment slot 230 of right latch 226 respectively can be adjusted accordingly to make the position and linear travel of interface plate cavity 224 suit position and linear travel of MCCB switch 504. This adjustment is as illustrated by region 506 and 508 respectively.FIG. 5A illustrates OFF condition and FIG. 5B ON condition of MCCB 502 of type-2.
[0065] In this fashion a plug-in box configured with rotor assembly 102 can accommodate different types and sizes of MCCBs.
[0066] While the invention disclosed is explained above using two rotors and associated components, it can be readily understood that the rotor assembly can as well be configured with only one rotor, one connector and one latch attached to interface plate, other details and functionalities remaining similar to as explained above.
[0067] As used herein, and unless the context dictates otherwise, the term “coupled to” is intended to include both direct coupling (in which two elements that are coupled to each other contact each other) and indirect coupling (in which at least one additional element is located between the two elements). Therefore, the terms “coupled to” and “coupled with” are used synonymously.
[0068] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C …. and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc. The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the appended claims.
[0069] 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
[0070] The present disclosure provides for a rotor assembly for a plug-in box that enables the plug-in box to accommodate and use moulded case circuit breakers (MCCBs) of different types, sizes and manufacture.
[0071] The present disclosure provides for a rotor assembly for a plug-in box wherein moulded case circuit breakers (MCCBs) of different types, sizes and manufacture can be used without changing any part of the plug-in box.
[0072] The present disclosure provides for a rotor assembly for a plug-in box wherein moulded case circuit breakers (MCCBs) of different types, sizes and manufacture can be changed quickly and easily.