Electromagnetic tripping mechanism and circuit breaker with same

Abstract

The invention relates to the technical field of low-voltage electrical appliances, in particular to an electromagnetic tripping mechanism and a circuit breaker with the same. The electromagnetic tripping mechanism comprises a keeper, a conductive member and a magnetic yoke arranged sequentially along a vertical direction, and an elastic reset member, wherein the magnetic yoke is provided with at least one second pull-in surface which is bent towards a first pull-in surface of the conductive member, and the conductive member is arranged between the main body portion of the magnetic yoke and thesecond pull-in surface; and the elastic reset member is arranged between a shell and the keeper, the elastic reset member stores energy when current is supplied to the conductive member, and energy is released after the current disappears so as to apply an acting force to the keeper to return to the initial position. According to the electromagnetic tripping mechanism and the circuit breaker withthe same, the keeper can be quickly pulled in even if the current is small, and tripping of products is realized.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to an electromagnetic tripping mechanism and a circuit breaker having the same. Background technique [0002] A low-voltage circuit breaker is a switching device that can not only switch on and off normal load current and overload current, but also switch on and off short-circuit current. In addition to controlling the circuit, the low-voltage circuit breaker also has certain protection functions, such as overload, short circuit, undervoltage and leakage protection. [0003] There is usually a protection mechanism in the circuit breaker, that is, an electromagnetic tripping mechanism. When the current passing through the circuit breaker increases to a certain value, the electromagnetic tripping mechanism makes the circuit breaker trip quickly, thereby protecting the circuit breaker. For example, the Chinese patent document CN207458872U discloses an electro...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the electromagnetic trip mechanism in the prior art cannot be disconnected quickly when the passing current is small, so as to provide an armature that can quickly attract the armature when the passing current is small, so that Electromagnetic tripping mechanism for product tripping and circuit breaker with same

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