FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"RESIDUAL CURRENT CIRCUIT BREAKER DEVICE WITH IMPROVED FLAG INDICATOR AND REMOTE CONTROL MECHANISM THEREFOR"
2. APPLICANT:
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: L& T House
Ballard Estate, P. O. Box No. 278 Mumbai 400 072, INDIA
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

RESIDUAL CURRENT CIRCUIT BREAKER DEVICE WITH IMPROVED FLAG INDICATOR AND REMOTE CONTROL MECHANISM THEREFOR
Field of invention
The present invention relates to residual current circuit breakers and more particularly to flag indicators of the residual current circuit breakers.
Background of the Invention
Residual current circuit breakers (RCCB, hereinafter) are well known for disconnecting electrical circuit under unbalanced electrical current condition between the energized and neutral conductors. The RCCBs are designed to disconnect the electrical circuit during current leakage to the ground. Hence, the residual current circuit breakers are also known as ground fault circuit interrupter or appliance leakage current interrupter.
Generally, the RCCB includes two indicator flags such that the first indicator flag indicates closure of electrical contacts and the second indicator flag indicates a tripped condition. However, the use of two indicator flags makes the kinematic of these RCCBs apparently complex as it needs a plurality of different pieces for controlling the flag indication in the tripped condition of the RCCB. This complex design of RCCB structurally limits positioning of the auxiliary contacts only on one side of the RCCB without facilitating auxiliary contacts on both sides of the RCCB.
Another drawback of the existing RCCBs is evident when these RCCBs are controlled remotely. There are few attempts seen in the art for remotely controlling the RCCB devices, but these prior art RCCB devices essentially need creation of a parallel circuit to a test button. Moreover, these prior art devices do

not have electrical conductors positioned after the RCCBs. This substantially reduces safety in remote control of these RCCBs.
Therefore, there exists a need of a RCCB that eliminates all the drawbacks of prior art.
Objects of the invention
It is an object of the present invention to provide a Residual current circuit breakers (RCCB, hereinafter) having a kinematic with a single flag indicator for signaling the tripped condition of the RCCB.
Another object of the present invention is to provide a RCCB having a new remote control circuit having an improved safety.
Summary of the invention
Accordingly, the present invention provides a kinematic adapted for a residual current circuit breaker device for signaling a tripped condition which comprises an actuating lever rotatably coupled to a transmission lever. The kinematic of the residual current circuit breaker device includes an engagement means connecting to a first lever, a flag indicator lever and the actuating lever. The kinematic of the residual current circuit breaker device includes a first hook lever that engages with a second hook lever through a rotatable shaft. The first hook lever connects to the actuating lever. The second hook lever engages with the flag indicator lever thereby retaining the flag indicator lever positioned thereon. The kinematic of the residual current circuit breaker device includes a relay that connects to a lever through a pin. The lever engages with the first lever for facilitating rotation thereof. The lever engages with a spring for pressing the pin therein. The kinematic of the residual current circuit breaker device a mobile contact arm and a fixed contact arm. The mobile contact arm connects to the rotatable shaft through

a main spring. The kinematic of the residual current circuit breaker device includes a signal flag indicator that connects to the rotatable shaft for indicating an open position and a closed position of the mobile contact arm with the fixed contact arm. The kinematic of the residual current circuit breaker device includes a coil having an additional control coil and a contact. The control coil and the contact configured for realizing a remote contra!. The additional control coil causes intervention of the relay for generating a tripping condition.
Brief description of the invention
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 a front view of a residual current circuit breaker (RCCB, hereinafter) device constructed in accordance with an embodiment of the present invention in an OFF position;
FIG. 2 is a rear view of the RCCB device of FIG. 1 in the OFF position;
FIG. 3 is a front view of the RCCB device of FIG. 1 in an ON position;
FIG. 4 is a front view of the RCCB device of FIG. i showing a trip instant of the RCCB device;
FIG. 5 is a front view of the RCCB device of FIG. 1 showing a Final trip position of the RCCB device;

FIG. 6 is a rear view of the RCCB device of FIG. I showing the final trip position of the RCCB device;
FIG.7 is a plan view of the RCCB device of FIG. I; and
FIG. 8 a front view of the RCCB device of FIG. 1 showing a remote control adapted for the RCCB device.
Detail 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.
Referring to FIG. 1, a kinematic of a residual current circuit breaker device 100 (RCCB device 100, hereinafter) in accordance with a preferred embodiment of the present invention is illustrated. The kinematic of the RCCB device 100 includes a drum 1 coupled to a handle la. The kinematic of the RCCB device 100 includes a transmission lever 2 and an actuating lever 3. The actuating lever 3 is rotatably coupled to the transmission lever 2. The transmission lever 2 and the actuating lever 3 do not have a rotation axle fixed to the casing. The kinematic of the RCCB device 100 includes an engagement means 4 coupled to the actuation lever 3 along a link 3A. The engagement means 4 in this one particular embodiment is an engagement lever or a cam. The engagement means 4 is having a rotation axle fixed to the casing along a link 4A. The engagement means 4 connects to a first lever 5 and a first flag indicator lever 6 in this one particular embodiment. The first lever 5 is having a rotation axle fixed to the casing along a link 5A. The flag indicator lever 6 is having a rotation axle fixed to the casing along a link 6A. The flag indicator lever 6 is having a signaling end 6B that indicates a tripping condition of the RCCB device 100 in this one particular embodiment. The

actuation lever 3 couples to a first hook lever 7. The first hook lever 7 engages with a rotatable shaft 8. The kinematic of the RCCB device 100 includes a second hook lever 9 adapted to work in conjunction with the flag indicator lever 6 thereby retaining the flag indicator lever 6 in position under tripped condition of the RCCB device 100. In this one particular embodiment, the kinematic of RCCB device 100 includes a coil 10. The rotatable shaft 8 connects to a mobile contact arm 12 through a main spring 11. The kinematic of RCCB device 100 includes a fixed contact arm 13 in this one preferred embodiment. The kinematic of RCCB device 100 includes a signal flag indicator 15 that engages with the shaft 8. The signal flag indicator 15 indicates an open or a closed position of the mobile contact arm 12 and the fixed contact arm 13, respectively. The signaling flag indicator 15 is rotatable with respect to the shaft 8.
As shown in FIG. 2, the kinematic of the RCCB device 100 includes a relay 20 and a lever 21. The relay 20 includes a pin 23 that engages with the lever 21. The pin 23 protrudes from the relay 20, The lever 21 is adapted to engage with the lever 5. In this one preferred embodiment, the kinematic of the RCCB device 100 includes a spring 24 that acts on the lever 21 for pressing the pin 23 inside the relay 20. The pin 23 protrudes from the relay 20 (As shown by a dotted line) and preferably directly acts on the lever 21 such that the lever 21 and the spring 24 are in contact facilitating the spring 24 to act on the lever 21. In this one preferred embodiment, the lever 21 is fixedly engaged with the spring 24 such that the spring 24 is having a fulcrum around which the lever 21 rotates during operation.
Referring again to FIGS. 1-2, the kinematic of the RCCB device 100 is shown in an OFF position. In this position, the mobile contact arm 12 and the fixed contact arm 13 are in open condition, in this position, the signal flag indicator 15 signals that the mobile contact arm 12 and the fixed contact arm 13 are in open condition. In this position, the flag indicator lever 6 is not engaged with the hook 9. Instead, the flag indicator lever 6 is kept in position by a spring (not shown). In this

position, the engagement means 4 is unable to rotate the first lever 5 to stop the rotation of the engagement means 4.
Referring to FIG. 3. the RCCB device is shown in an ON position in accordance with an embodiment of the present invention. In this position, the mobile contact arm 12 and the fixed contact arm 13 are in closed condition. In this position, the signal flag indicator 15 signals that the mobile contact arm 12 and the fixed contact arm 13 are in a closed condition. In this position, the flag indicator lever 6 is not engaged with the hook 9. Instead, the flag indicator lever 6 is kept in position by a spring (not shown). In this position, the action engagement means 4 engage with the lever 5 by a toothed action.
Referring to FIG. 4, a trip instance of the RCCB device 100 is shown wherein the RCCB device 100 is in a non stable position. In this position, the lever 5 is moved by the engagement means 4 responsive to the action of the pin 23 on the lever 21. In this position, the engagement means 4 moves in a clockwise direction that drives the flag indicator lever 6 in a counterclockwise direction. In this position, the flag indicator lever 6 engages with the hook 9 thereby showing the indication of "tripped" condition in a different color. In this position, the releasing means 4 rotates to act on the flag indicator lever 6 thereby pushing the flag indicator lever 6 towards the hook 9 to facilitate their mutual engagement. In this position, the shaft 8 rotates to keep an open condition of the mobile contact arm 12 and the fixed contact arm 13. In this position, the flag indicator 15 moves to indicate the open condition of the mobile contact arm 12 and the fixed contact arm 13. The connection between the flag indicator lever 6 and the hook 9 facilitate the flag indicator 15 to be visible in the tripped instance of the RCCB device 100. in the tripped instance, the relay 20 acts on the lever 21 facilitating rotation of the lever 5. In this one embodiment, the lever 5 acts on the releasing means 4 which rotates the mobile contact arm 12 by means of the lever 7 and the shaft 8.

Referring to FIG. 5, a trip instance of the RCCB device 100 is shown wherein the RCCB device 100 is in a stable position. In this position, the releasing means 4 moves in a counterclockwise direction and returns to its initial position by overcoming the tooth of the lever 5. In this position, the flag indicator lever 6 remains engaged in the hook 9 thereby giving continuous indication of the "tripped" condition of the RCCB device 100. In this position, the shaft 8 maintains the open condition of the mobile contact arm 12 and the fixed contact arm 13. In this position, the flag indicator 15 maintains the indication of the opened contact between the mobile contact arm 12 and the fixed contact arm 13.
Referring to FIG. 6, the trip instance of the RCCB device 100 is shown wherein the RCCB device is in a final trip condition. In the final trip condition, the lever 21 is adapted to be moved by the spring 24 to push the pin 23 inside the relay 20. In this position, a subsequent operation of the handle la disengages the flag indicator lever 6 from the hook 9 thereby erasing the tripped signal.
Referring now to FIGS. 1 and 7, the kinematic of the RCCB device 100 includes a lever 30 that is coupled to a lever 31. The lever 30 is rotatable with respect to the casing and is driven by the drum 1 in this one preferred embodiment. The lever 30 and the flag indicator lever 6 cooperate with neighboring accessories and are coupled to the RCCB device 100 for additional operation and/or signaling.
As shown in FIG. 8, the coil 10 comprises an additional control coil 90 that connects to a contact 91. The coil 90 and the contact 91 are adapted for realizing a remote control of the RCCB device 100. The additional control coil 90 and the contact 91 facilitate a new remote control circuit having an improved safety. The additional control coil 90 facilitates passage of the current such that a magnetic field is generated thereby causing intervention of the relay 20. The intervention of the relay 20 generates a tripping condition, in this condition, the power provided to the additional control coil 90 is taken after the RCCB device 100 or provided

by a power source with low tension for safety reasons in accordance with the present invention.
Advantages of the present invention:
1. The single flag indicator lever 6 of the RCCB device 100 is adapted for signaling the tripped condition thereby advantageously simplifying the complexity in the kinematic of the RCCB device 100.
2. The coil 10 of the RCCB device 100 is having the control coil 90 connecting to the contact 91 adapted for advantageously providing intervention of the relay 20 for generating the tripping condition wherein the power provided to the additional control coil 90 is taken with low tension for providing safety to the RCCB device 100.
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, 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 omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient. but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

We Claim:
1. A kinematic adapted for a residua! current circuit breaker device for signaling a tripped condition, the kinematic of the residual current circuit breaker device comprising:
an actuating lever rotatably coupled to a transmission lever;
an engagement means connecting to the actuating lever, the engagement means connecting to a first lever by a toothed action, the engagement means connecting to a flag indicator lever facilitating rotation thereof;
a first hook lever engaging with a second hook lever through a rotatable shaft, the first hook lever connecting to the actuating lever, the second hook lever engaging with the flag indicator lever thereby retaining the flag indicator lever positioned thereon;
a relay connecting to a lever through a pin, the lever engaging with the first lever facilitating rotation thereof, the lever engaging with a spring for pressing the pin therein;
a mobile contact arm and a fixed contact arm, the mobile contact arm connecting to the rotatable shaft through a main spring;
a signal flag indicator connecting to the rotatable shaft for indicating an open position and a closed position of the mobile contact arm with the fixed contact arm; and
a coil having an additional control coil and a contact, the control coil and the contact configured for realizing a remote control, the additional control coil causing intervention of the relay for generating a tripping condition.