Patent ID: 8547190

Claim:
A tripping apparatus for a circuit breaker, comprising: at least a controllable tripping magnet including an armature operatively connected to a downstream tripping catch, which engages in a tripping mechanism that acts on the circuit breaker and is coupled to a preloaded spring serving as a force amplifier, the tripping mechanism comprising a camshaft including a plurality of cam lobes; an actuating device associated with each of the plurality of cam lobes, each actuating device respectively arranged at an offset rotational angle, wherein when the tripping apparatus is tripped, at least two actuating processes associated with the actuating devices take place consecutively, so that the full spring force is transmitted by way of the camshaft to at least one of said actuating devices so as to perform a relevant actuating process, and a first one of the actuating devices is configured as a breaker mechanism lever of a breaker mechanism, and comprises a curved contour which is configured such that, after the breaker mechanism lever reaches an end position thereof, upon a further rotational movement of the camshaft caused by the spring force, the cam lobe associated with the breaker mechanism lever slides along the curved contour such that the rotational angle of the camshaft increases without the end position of the breaker mechanism lever changing.