Tripping apparatus, particularly for circuit breakers

Abstract

The invention relates to a tripping apparatus (1), particularly for circuit breakers, which comprises at least one controllable tripping magnet (2) having an armature (2.1) that is operatively connected to a downstream tripping gear (6.3), which engages in a tripping mechanism that acts on the circuit breaker and is coupled to a preloaded spring (4) serving as a force amplifier. According to the invention, the tripping mechanism comprises a camshaft (5) having a plurality of cam lobes (5.1, 5.2, 5.4), wherein an actuating means (6) is associated with each cam lobe (5.1, 5.2, 5.4) having an offset rotational angle, and wherein, when tripped, at least two actuating processes associated with the respective actuating means (6.1, 6.2, 6.3) take place consecutively, so that the full spring force is transmitted by way of the camshaft (5) to at least one of said actuating means (6.1, 6.2, 6.3) so as to perform the relevant actuating process.

Description

technical field [0001] The invention relates to a tripping device, in particular for a circuit breaker, which has at least one controllable tripping magnet with an armature, which is operatively connected to a rear-mounted tripping catch, which acts on the circuit breaker. The release mechanism on the device is engaged, and the release mechanism is coupled with a pre-tensioned spring as a force amplifier. Background technique [0002] This trip unit with force amplification is used to operate circuit breakers. Circuit breakers designed for large currents can not only switch operating currents and small overload currents, but can also switch on large overload currents and short-circuit currents in the event of a fault, and this fault current is maintained for a given time and then disconnected. Overcurrents relate to the weakest link of the installation placed behind the circuit breaker as seen in the direction of energy flow. In order to protect the downstream equipment ag...

AI Technical Summary

Problems solved by technology

But this requires magnets with higher power requirements, which obviously increases the processing cost of this trip mechanism

In addition, the measures described require more installation space, which is generally not available

[0006]The switching times required by current circuit breakers can sometimes no longer be achieved with the solutions known from the prior art

At the same time a low energy actuator is required to actuate the trip detent, which also limits the spring force

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