Claims:
1. A circuit breaker comprising:
an operating mechanism (100) having a motor (16) and a gear assembly; and
a cam driver gear arrangement (A1, A2) mounted on said motor (16);
wherein a driver gear (A1) of said cam driver gear arrangement (A1, A2) is adapted to rotate along with the motor (16), which in turn translates a motion intermittently to a driven gear (A2) of said cam driver gear arrangement (A1, A2);
wherein said gear assembly comprises a worm gear (4D) coupled with said driver gear (A1) through a unidirectional bearing (21) such that said driver gear (A1) is adapted to rotate said worm gear (4D) at least two quarters with each rotation said motor (16).

2. The circuit breaker as claimed in claim 1, wherein during charging operation, when the motor starts rotating on receipt of power supply, said driver gear (A1), upon completion of one rotation, is adapted to engage with said driven gear (A2) for certain pre-determined degree of rotation and then adapted to disengage rotate freely.

3. The circuit breaker as claimed in claim 2, wherein when said driver gear (A1) engages with said driven gear (A2), said driver gear (A1) is adapted to at least partially charge a main spring system so as to enable said driven gear (A2) to retain its original position and repeat said charging operation.

4. The circuit breaker as claimed in claim 1, wherein said gear assembly further comprises a worm gear unit (4) that comprises said worm gear (4D), a sun gear (1), an epicyclic gear train (300), and a pinion (11) and rack (13) assembly.

5. The circuit breaker as claimed in claim 4, wherein said worm gear unit (4) comprises a spur gear (4A), a worm wheel (4B), a unidirectional bearing (4C) and said worm gear (4D), wherein said worm gear unit (4) is adapted to be driven by the motor (16) during automatic switching OFF operation of the circuit breaker.

6. The circuit breaker as claimed in claim 5, wherein said worm gear unit (4) is coupled to said sun gear unit (1) for transferring a rotary motion of the motor thereto.
7. The circuit breaker as claimed in claim 5, wherein said worm gear unit (4) comprises a solenoid spring (20) that is adapted to undergo a rotary motion when said worm gear unit being driven by the motor (16) so as to reduce speed of the motor and increasing torque transmission.

8. The circuit breaker as claimed in claim 5, wherein the spur gear (4A) is coupled with the sun gear unit (1) and to the worm gear unit (4) for further reducing the motor speed.

9. The circuit breaker as claimed in claim 8, wherein the epicyclic gear train (300) is coupled to the spur gear unit (4A) to transfer the rotary motion therefrom and the pinion (11) and rack (13) assembly is coupled to the epicyclic gear train 2 for converting rotary motion to larger linear motion.

10. The circuit breaker as claimed in 1, further comprises an internal gear arrangement (14) having a projection (14a) on the start point of charging or ON position of the circuit breaker, wherein said projection (14a) is adapted to enable transfer of the load being to a supportive latch (18) such that when a charging is initiated and on the way of achieving completion, said load is shifted from said supportive latch (18) to a main epicyclic latch (3).
, Description:The present disclosure relates to motor operators / remote operators of molded case circuit breakers (MCCB) for operating contact system using a mechanism. In an aspect, the circuit breaker can include an operating mechanism, a cam driver gear arrangement. The operating mechanism can have a motor and a gear assembly. The cam driver gear arrangement can be mounted on said motor. A driver gear (A1) of said cam driver gear arrangement can be adapted to rotate along with the motor so as to translate motion intermittently to a driven gear (A1) of said cam driver gear arrangement. The gear assembly can include a worm gear having a unidirectional bearing that is coupled with said a driven gear (A1) such that said a driven gear (A1) can be adapted to rotate said worm gear at least by two quarters with each rotation of said motor.