A compact circuit breaker mechanism comprising: a handle assembly including a handle; a driving spring charging system comprising: at least one driving spring mounted between a camshaft and a fixed frame of the circuit breaker; motion transferring means coupled with the handle assembly and the camshaft, such that, every stroke of the handle rotates the camshaft in a direction opposite the direction of the handle rotation thereby charging said driving spring; a locking mechanism for preventing reverse direction rotation of the camshaft; a crank and slider assembly comprising: a crankshaft; a latch mechanism assembled on said crank shaft but moving independently of said crankshaft characterized in; at least two crank assemblies assembled on said crank shaft, each on either side of said latch mechanism, each of said crank assembly including at least two crank plates coupled to each other, a connecting rod being provided such that one end of said connecting rod is slidably assembled intermediate said at least two crank plates and the other free end has provision to be assembled with a slider rod; opening spring assemblies provided at the outer sides of the crank assemblies positioned independent of the crank shaft but integrally connected to a moving support, which is assembled on the slider rod, said opening spring being configured to be charged or discharged from the instant the circuit breaker starts closing or opening depending on the direction of movement of the crank assembly on the crankshaft; and a slider assembly comprising: a slider and moving contact assemblies with pressure springs to close and open the circuit breaker, the slider assembly adapted to move as one unit when the slider moves in a direction indicating closing of the circuit breaker. a handle assembly including a handle; a driving spring charging system comprising: at least one driving spring mounted between a camshaft and a fixed frame of the circuit breaker; motion transferring means coupled with the handle assembly and the camshaft, such that, every stroke of the handle rotates the camshaft in a direction opposite the direction of the handle rotation thereby charging said driving spring; a locking mechanism for preventing reverse direction rotation of the camshaft; at least one driving spring mounted between a camshaft and a fixed frame of the circuit breaker; motion transferring means coupled with the handle assembly and the camshaft, such that, every stroke of the handle rotates the camshaft in a direction opposite the direction of the handle rotation thereby charging said driving spring; a locking mechanism for preventing reverse direction rotation of the camshaft; a crank and slider assembly comprising: a crankshaft; a latch mechanism assembled on said crank shaft but moving independently of said crankshaft a crankshaft; a latch mechanism assembled on said crank shaft but moving independently of said crankshaft at least two crank assemblies assembled on said crank shaft, each on either side of said latch mechanism, each of said crank assembly including at least two crank plates coupled to each other, a connecting rod being provided such that one end of said connecting rod is slidably assembled intermediate said at least two crank plates and the other free end has provision to be assembled with a slider rod; opening spring assemblies provided at the outer sides of the crank assemblies positioned independent of the crank shaft but integrally connected to a moving support, which is assembled on the slider rod, said opening spring being configured to be charged or discharged from the instant the circuit breaker starts closing or opening depending on the direction of movement of the crank assembly on the crankshaft; and a slider assembly comprising: a slider and moving contact assemblies with pressure springs to close and open the circuit breaker, the slider assembly adapted to move as one unit when the slider moves in a direction indicating closing of the circuit breaker. a slider and moving contact assemblies with pressure springs to close and open the circuit breaker, the slider assembly adapted to move as one unit when the slider moves in a direction indicating closing of the circuit breaker.