Electromagnetic tripping device and circuit breaker equipped with the electromagnetic tripping device

Abstract

The invention belongs to the technical field of low-voltage apparatuses, and relates to an electromagnetic trip device and a breaker with the electromagnetic trip device. The electromagnetic trip device comprises a magnetic yoke, a movable iron core and a counter-force spring. The movable iron core is arranged on the magnetic yoke, the upper end of the movable iron core extends out of the magnetic yoke, and the counter-force spring is arranged on the movable iron core in a sleeving mode. The electromagnetic trip device is characterized by further comprising a permanent magnet used for providing magnetic flux flowing through a magnetic path and generating electromagnetic attraction force to the movable iron core, the permanent magnet is arranged on the magnet yoke, the lower end of the movable iron core corresponds to the permanent magnet, the upper end of the counter-force spring is borne by the movable iron core, the lower end of the counter-force spring is borne by the permanent magnet, and when the large current flows through an external current loop, the movable iron core is trigged to act. The current carrying row of a main loop or the constraint factor of the current-carrying coil section is eliminated; the size is reduced, the installing space is saved, the electromagnetic trip device can be completely isolated from the main loop, the safety coefficient is increased, installing is flexible and convenient, and the electromagnetic trip device can be installed at reasonable positions of the breaker; copper product resources can be saved, and the resistance value and the power consumption of the breaker can also be obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an electromagnetic tripping device, and also relates to a circuit breaker equipped with the electromagnetic tripping device. Background technique [0002] As known in the industry, circuit breakers usually have functions such as overload, short circuit and residual current action protection. The short circuit protection function is composed of moving iron core, static iron core, coil, yoke (also called yoke), reaction spring and transmission rod The constituted electromagnetic tripping device senses and establishes a magnetic field, and provides trigger energy to the actuator, such as the operating mechanism of the circuit breaker, through the action of the transmission rod, so that the operating mechanism acts to break the fault current, that is, to disconnect the circuit. [0003] The technical information of the electromagnetic tripping de...

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Problems solved by technology

However, in the patents and non-patent literature disclosed so far, there is no enlightenment to solve the technical problem

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