FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"Arrangement of Electrical Switching Devices"
2. APPLICANT:
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: LARSEN & TOUBRO LIMITED,
L&T House, Ballard Estate, p. 0. Box: 278, Mumbai 400 001, India
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

Arrangement of Electrical Switching Devices
Field of the invention
The present invention relates generally to electrical switching devices and more particularly, to an arrangement of the electrical switching devices with a distribution block to make a compact enclosure with particular forms of separation.
Background of the invention
There are two types of enclosures used to distribute the generated power namely a Power Control Centre (PCC) and a Motor Control Centre (MCC). The PCC is a unit that distributes the power to different MCC and a Main Distribution Board (MDB) is a device used to distribute that power intelligently to different motor loads and lamp loads using feeders. Feeders are a semi enclosed housing consisting of a chassis and a door.
Figure 1 shows a block diagram of power generation in an enclosure in accordance with the prior art. Conventionally, each individual electrical device had to be tapped off from a vertical busbar separately. It was used to occupy much space physically with over provision of copper links for tapping. Also, the degree of protection was used to be achieved with very tedious shrouding.
Figure 2 shows a block diagram showing distribution of a single main supply to multiple outgoing circuits through a distribution block in accordance with the prior art.
In conventional system, there is no concept of modular distribution block to avail the supply for multiple outgoing. At present, direct link tapping is used for

such kind of arrangement that involves tedious, non standard and overdesigned link work and shrouding.
Accordingly, there exists a need to provide an arrangement of electrical switching devices with a distribution block to make a compact enclosure that overcomes the drawbacks of the prior art.
Objects of the invention
An object of the present invention is to provide an arrangement of electrical switching devices with a distribution block to make a compact enclosure with particular forms of separation.
Another object of the present invention is to provide a neat, clean, modular and optimum solution of the arrangement of the electrical switching devices up to form 3 and IP2X protection that is extendable up to form 4B separation.
Summary of the invention
Accordingly, the present invention provides an arrangement of electrical switching devices. The arrangement comprises a vertical busbar and a distribution block. The distribution block is connected to the vertical busbar through a connecting link inside a panel. The distribution block is capable of converting a single power supply input into many power outputs. The distribution block comprises a minibus assembly and an electrical device adaptor assembly.
The minibus assembly includes a plurality of minibus, a plurality of housing components and a plurality of mounting channels. The plurality of housing components is capable of cascading for widthwise extension. The electrical device adaptor assembly is mounted on the minibus assembly. The electrical

device adaptor assembly comprises a plurality of conductors connecting the minibus assembly to the electrical switching devices and a shroud providing support and degree of protection to the electrical switching devices.
The distribution block facilitates the arrangement of the same/different electrical switching devices together with proper degree of protection and form of separation in the smallest possible space thereby forming a compact enclosure. An incoming supply point of the distribution block is availed on rear, front and on either side at any point widthwise.
Brief description of the drawings
Figure 1 shows a block diagram of power generation in an enclosure in accordance with the prior art;
Figure 2 shows a block diagram showing distribution of a single main supply to multiple outgoing circuits through a distribution block in accordance with the prior art;
Figure 3 shows a side perspective view of an arrangement showing an assembly of the distribution block with a vertical busbar inside a panel, in accordance with the present invention;
Figures 4-15 shows different positions of a supply point, in accordance with the present invention;
Figure 16 shows a side perspective view of the distribution block of figure 3;
Figure 17 shows a front and a rear side of cascading of a minibus housing components, in accordance with the present invention;

Figure 18 shows a front and a rear side of the minibus housing components of figure 5;
Figure 19 shows an assembly view of an electrical device adaptor assembly connecting to a minibus assembly;
Figure 20 shows a front and a rear view of the electrical device adaptor assembly of figure 7; and
Figure 21 is a front view of the electrical device adaptor assembly of figure 8 showing a shroud.
Detailed description of the invention
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiments.
The present invention provides an arrangement of electrical switching devices with a distribution block to make a compact enclosure with particular forms of separation. The present invention provides a neat, clean, modular and optimum solution of the arrangement of the electrical devices up to form 3 and IP2X protection that is extendable up to form 4B separation.
The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description.

Referring to figures 3-9, an arrangement (100) of electrical switching devices (60) to make a compact enclosure (not shown) in accordance with the present invention is shown. The arrangement (100) comprises a vertical busbar (20) and a distribution block (40).
Specifically, figure 3 shows a connection of the distribution block (40) to the vertical busbar (20) inside a panel (not shown). The distribution block (40) is connected to the vertical busbar (20) through a connecting link (80). The vertical busbar (20) is positioned on a left side in the panel behind the distribution block (40). The distribution block (40) takes the supply from different locations of the vertical busbar (20) such as middle behind of the distribution block (40), on the very right side of the distribution block (40) and the like. The distribution block (40) is used in the arrangement (100) of same or different electrical switching devices (60) for example, a molded case circuit breaker, a miniature circuit breaker, switches and the like together in the enclosure.
The distribution block (40) converts a single power supply input/point (hereinafter "the supply point (22)") into many power outputs in a very compact and modular manner. The incoming supply point (22) of the distribution block (40) is availed on rear, front and on either side at any point widthwise. The same distribution block (40) is configured in the various configurations that is possible due to two factors namely location of a supply conductor (not shown) and a type of a customer termination (24). The location of the supply point (22) is possible on a left side, a right side, middle as well as behind the distribution block (40). The customer termination (24) is provided in various manners, for example a front termination provided directly over the electrical switching device (60), a rear termination from the rear side of the distribution block (40) and a side termination. In an embodiment, the customer termination (24) is a termination where a customer connects a load cable.

Specifically, figures 4-15 show different positions of the supply point (22). Figure 4 shows the configuration where the supply point (22) is at rear side of the electrical switching device (60) on left side thereby facilitating the front termination.
Figure 5 shows the configuration where the supply point (22) is at a top side of the electrical switching device (60) on left side thereby facilitating the rear termination at other end of the electrical switching device (60).
Figure 6 shows the configuration where the supply point (22) is at rear side of the electrical switching device (60) in the middle thereby facilitating the front termination.
Figure 7 shows the configuration where the supply point (22) is at top of the electrical switching device (60) in the middle thereby facilitating the rear termination at other end of the electrical switching device (60).
Figure 8 shows the configuration where the supply point (22) is at rear side of the electrical switching device (60) on right side thereby facilitating the front termination.
Figure 9 shows the configuration where the supply point (22) is at top of the electrical switching device (60) on right side thereby facilitating the rear termination at other end of the electrical switching device (60).
Figure 10 shows the configuration where the supply point (22) is at left side of the electrical switching device (60) thereby facilitating the front termination at the electrical switching device (60).
Figure 11 shows the configuration where the supply point (22) is at top left side

of the electrical switching device (60) thereby facilitating the rear termination at the electrical switching device (60).
Figure 12 shows the configuration where the supply point (22) is at right side of the electrical switching device (60) thereby facilitating the front termination at the electrical switching device (60).
Figure 13 shows the configuration where the supply point (22) is at top right side of the electrical switching device (60) thereby facilitating the rear termination at the electrical switching device (60).
Figure 14 shows the configuration where the supply point (22) is at top side thereby facilitating the front termination at the electrical switching device (60) on the either side.
Figure 15 shows the configuration where the supply point (22) is at bottom side thereby facilitating the front termination at the electrical switching device (60) on the either side.
Now referring to figures 16-21, the distribution block (40) comprises a minibus assembly (30), an electrical device adaptor assembly (36) and a plurality of blank covers (37). The blank cover (37) is used to hide the current carrying/live parts thereby providing protection from the front side wherever the minibus assembly (30) is revealed.
The minibus assembly (30) is a current conductor. The minibus assembly (30) includes a plurality of minibus (26), a plurality of housing components (28) and a plurality of mounting channels (29). The plurality of mounting channels (29) holds the distribution block (40) together with the enclosure.
The distribution block (40) uses a plurality of conductor links (not shown) to tap

the supply from the minibus assembly (30). The plurality of housing components (28) provide many features like -
1. Supporting the plurality of minibus (26)
2. Provision of degree of protection
3. Ventilation for better performance
4. Cascading facility for widthwise extension
5. Accommodation of different rectangular cross section of conductor
In an embodiment, cascading of the plurality of housing components (28) is possible for widthwise extension. The minibus assembly (30) is modular that is extended widthwise to any extend required to increase the number of electrical switching devices (60) connected to the minibus assembly (30).
The electrical device adaptor assembly (36) is mounted on the minibus assembly (30) by a bolt connection (38). The electrical device adaptor assembly (36) comprises a plurality of conductors/links (32) and a shroud (34). The plurality of conductors (32) connects the minibus assembly (30) to the electrical switching devices (60). The shroud (34) provides a support and degree of protection. The shroud (34) of the electrical device adaptor assembly (36) provides many features like -
1. Supporting the plurality of conductors (32)
2. Provision of degree of protection
3. Capable of assembling at any point of width of the minibus assembly (30)
4. Accommodation of different rectangular cross section of the plurality of conductors (32)
5. Same adaptor housing is used for different the electrical switching devices (60)
The distribution block (40) is assembled inside the enclosure and connected to the vertical busbar (20) for availing power supply through a plurality of

terminals (not shown). These terminals are availed at any point of width of the distribution block (40). At the end, electrical switching devices (60) are connected to respective electrical device adaptor assemblies (36) and the other terminals of the electrical switching devices (60) are available for customer terminations (24). As per mentioned in the IEC standards, the arrangement (100) is compliant with different form of separation and degree of protection.
The arrangement (100) provides a neat, modular, scalable and flexible arrangement of electrical switching devices (60) with proper degree of protection and form of separation in the smallest possible space.
Advantages of the invention
1. The arrangement (100) of the electrical switching devices (60) provides particular form of separation and degree of protection.
2. The arrangement (100) provides a neat, clean, modular and optimum solution of arrangement of electrical devices up to form 3 and IP2X protection that is extendable up to form 4B separation.
3. The arrangement (100) provides modularity and flexibility in enclosure configurations.
4. The arrangement (100) is compatible to different electrical switching devices (60) and used in any type of the enclosure.
5. The arrangement (100) allows utilization of the optimum space inside the enclosure resulting in reducing the footprint area of the enclosure installation.
6. The arrangement (100) is extendable by cascading the same components.

7. The arrangement (100) allows accommodation of different conductor sizes for different current rating to achieve optimization.
8. The arrangement (100) allows connection of the distribution block (40) with the supply points (22) located at different positions.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, and to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such omissions and substitutions are intended to cover the application or implementation without departing from the spirit or scope of the claims of the present invention.

We Claim:
1. An arrangement (100) of electrical switching devices (60)
comprising:
a vertical busbar (20); and
a distribution block (40) connected to the vertical busbar (40) through a connecting link (80) inside a panel, the distribution block (40) being capable of converting a single power supply point (22) into many power outputs, the distribution block (40) having.
a minibus assembly (30) having a plurality of minibus (26), a plurality of housing components (28) and a plurality of mounting channels (29), the plurality of housing components (28) being capable of cascading for widthwise extension, and
an electrical device adaptor assembly (36) mounted on the minibus assembly (30), the electrical device adaptor assembly (36) having,
a plurality of conductors (32) connecting the minibus assembly (30) to the electrical switching devices (60), and
a shroud (34) providing support and degree of protection to the electrical switching devices (60),
wherein, the distribution block (40) facilitates the arrangement (100) of the same/different electrical switching devices (60) together with proper degree of protection and form of separation in the smallest possible space thereby forming a compact enclosure.
2. The arrangement (100) as claimed in claim 1, wherein the
incoming supply point (22) of the distribution block (40) is availed on rear, front
and on either side at any point widthwise.