FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
& THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
POLE-WISE MODULAR TERMINAL BLOCK FOR MOLDED CASE CIRCUIT BREAKER;
LARSEN & TOUBRO LIMITED, A COMPANY INCORPORATED UNDER THE COMPANIES ACT, 1956, WHOSE ADDRESS IS L&T HOUSE, BALLARD ESTATE, MUMBAI - 400 001, MAHARASHTRA, INDIA.
THE FOLLOWING SPECIFICATION
PARTICULARLY DESCRIBES THE
INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED,

FIELD OF INVENTION
The present invention relates to molded case circuit breaker (MCCB) and more particularly to terminals of MCCB.
BACKGROUND OF INVENTION
In the field of Molded Case Circuit Breakers termination, there has been a problem of adapting the circuit breaker in such a manner that it should be securely and quickly connected to different types of conductors such as flat, round, prepared and unprepared conductors.
In earlier MCCB terminals it was very difficult to change the termination types of MCCB at mounting location by the customer, once it was delivered to them. In other words, a MCCB which was delivered for front termination could not be used for rear termination.
Also, there was a problem in the proper connection of cables or bus bars to the terminals of MCCB.
A novel mechanism for termination of MCCB is therefore required and the same is disclosed as follows.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an easy access to the terminals of MCCB for assembling, tightening the fasteners and ensuring the electrical connections.
In accordance with this, there is provided a pole-wise modular terminal block comprising a slot and a joining piece. The joining piece is a flexible

component and can be inserted into the slot of the pole-wise terminal blocks by click fit action for connecting two or more pole-wise terminal blocks together.
The pole-wise modular terminal block further comprises a nut pocket which retains a nut at the bottom of each pole. The block assembly can be connected at both end of am MCCB thereby accommodating several types of terminations including but not limited to front, spreader, box-clamp, tunnel, rear round conductor and rear flat conductor. The block receives a terminal exiting MCCB at each pole compartment.
In one embodiment herein, there are provided through holes in the two side walls of the centre pole compartment of the block for mounting circuit breakers.
BRIEF DESCRIPTION OF THE DRAWINGS
Reference will be made to embodiments of the invention, examples of which may be illustrated in the accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Fig. 1 is represents the pole-wise terminal block assembly for a single pole MCCB according to the present invention.
Fig. 2 represents the nut pocket assembly according to the present invention.

Fig. 3 represents the technique for fitting the joining piece into the terminal block.
Fig. 3a is the enlarged view of the shape of the joining piece as per the present invention.
Fig. 4 illustrates the way in which two terminal blocks are joined together by the joining piece as per the present invention.
Fig. 5 shows the pole wise terminal block assembly for a three poles circuit breaker as per the present invention.
Fig. 6 illustrates the way in which the interconnected Pole-wise terminal blocks are connected to the MCCB at both load and line sides as per the present invention.
Fig. 7 represents the connection of spreader terminals to the MCCB terminals as per the present invention.
Fig. 8 represents the connection of rear terminals to the MCCB terminals as per the present invention.
Fig. 9 represents the fitting of box-clamp into the terminal compartments of the pole-wise terminal blocks as per the present invention.
DESCRIPTION OF THE INVENTION
Disclosed herein is a pole-wise modular terminal block that comprises a slot and a joining piece. The joining piece is a flexible component and is inserted into the slot of the pole-wise terminal blocks by click fit action for connecting two or more pole-wise terminal blocks together.

Fig. 1 is represents the pole-wise terminal block 101 assembly for a single pole MCCB according to the present invention. In Fig. 1, there is shown a nut pocket assembly 102 which comprises a nut pocket 202 that retains a nut 201 at the bottom of each pole as shown in Fig. 2. The nut pocket 202 which has hexagonal slot for retaining the nut 201. The entire nut holder assembly may be inserted in the slots provided at bottom of each pole compartments. Once the terminal block is fixed with the MCCB, the nut pocket assembly will be placed under the terminals of MCCB.
Fig. 3 represents the technique for fitting the joining piece into the terminal block. Fig. 3a is the enlarged view of the shape of the joining piece 302 as per the present invention. The joining piece 302 is a flexible component and is inserted into a slot 301 provided in the pole-wise terminal blocks 101 by click fit action.
Fig. 4 illustrates the way in which two terminal blocks are joined together by the joining piece 302 as per the present invention. Here the joining pieces 302 are inserted in the slot of a terminal block and another one terminal block is added by connecting to the same block. Likewise 'n' number of terminal blocks can be added by using the joining piece 302.
For connecting the bus bars and tunnel terminals from front side, whole nut pocket assembly may be used. This helps the nut to be retained exactly below the terminal surface. Further, the terminals may be connected to those conductors by screws which can be accessed from both top and front sides of the terminal block.

For Box-clamp termination, box-clamp may be inserted to the terminal compartment and it can be locked in the upward direction by inserting the nut pocket in reversed direction (and not full nut pocket assembly).
For rear connection of round conductors and links, the nut pocket is removed. The round conductors or stud can be inserted from bottom side and may be screwed to the terminal.
Fig. 5 shows the pole wise terminal block assembly for a three poles circuit breaker as per the present invention. Said pole-wise modular terminal block assembly can be connected at both end of the MCCB and it can accommodate several types of terminations such as front, spreader, box-clamp, tunnel, rear round conductor and rear flat conductor, etcetera. The pole-wise modular terminal block receives a terminal exiting MCCB at each pole compartment. The nut pocket assembly will be below the power terminals. The flat conductors such as bus bars are connected at terminals by screws and nuts which are retained by the nut pocket.
Fig. 6 illustrates the way in which the interconnected pole-wise terminal blocks are connected to the MCCB at both load and line sides as per the present invention. The pole-wise terminal block has gas vents at both bottom and top of each pole compartment. The purpose of gas vent is to exhaust the gases from the breaker housing during arcing period.
Fig. 7 represents the connection of spreader terminals to the MCCB terminals as per the present invention.

Fig. 8 represents the connection of rear terminals 801 to the MCCB terminals 802 as per the present invention.
Fig. 9 represents the fitting of box-clamp 902 into the terminal compartments 901 of the pole-wise terminal blocks as per the present invention.
Thus the pole-wise terminal block provides easy access to the terminals for assembling, tightening the fasteners and ensuring the electrical connections.
Further the above described embodiments of the present invention, has many advantages. The pole-wise terminal block can be utilized to provide several1 functions including main terminal protection, accommodatron of multiple terminations of multiple types, projections for gas vent, providing solutions for clearance and creepage issues as per the IEC and UL standards.
Also it provides projection for connecting inter phase barriers and terminal shield covers.
Another advantage of the present invention is that it eliminates separate terminal block moldings for two, three, and four pole breakers. The same single pole-wise terminal blocks can be used by joining irrespective to the number of poles of the breaker.
Overall it provides a safe routing for connection of external conductors to the incoming and outgoing terminals of MCCB. It also ensures proper connection of cables or bus bars to the terminals of MCCB.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

WE CLAIM
1. A pole wise modular terminal block comprising:
a slot; and
a joining piece;
wherein the joining piece is a flexible component and is inserted into the slot of the pole-wise terminal blocks by click fit action for connecting two or more pole-wise terminal blocks together.
2. The pole wise modular terminal block as in claim 1, wherein the block
further comprises a nut pocket which retains a nut at the bottom of each
pole.
3. The pole wise modular terminal block as in claim 1, wherein the block assembly can be connected at both end of am MCCB thereby accommodating several types of terminations including but not limited to front, spreader, box-clamp, tunnel, rear round conductor and rear flat conductor.
4. The pole wise modular terminal block as in claim 1, wherein the block receives a terminal exiting MCCB at each pole compartment.

5. The pole wise modular terminal block as in claim 1, wherein there are provided through holes in the two side walls of the centre pole compartment of the block for mounting circuit breakers.