Circuit breaker and automatic closing device thereof

Abstract

The invention discloses an automatic closing device of a circuit breaker. An automatic closing mechanism comprises a heat-sensitive element and a reset spring; after the heat-sensitive element is electrified, the automatic closing mechanism is enabled to push a handle of the circuit breaker to perform closing operation; after the heat-sensitive element is diselectrified, the reset spring enables the automatic closing mechanism to be reset. An auxiliary contact set is connected in series in a circuit used for supplying power to the heat-sensitive element. A rotary plate transmission mechanism is rotationally mounted on a base of the circuit breaker; when being in a first position, the rotary plate transmission mechanism does not interact with the auxiliary contact set; when being in a second position, the rotary plate transmission mechanism drives the auxiliary contact set to be switched off; the rotary plate transmission mechanism rotates to the second position from the first position in response to a trigger signal. A switching shift rod performs switching between an automatic position and a manual position; when being switched to the automatic position, the switching shift rod does not interact with the rotary plate transmission mechanism; when the switching shift rod is switched to the manual position, the trigger signal is generated. The trigger signal is further generated by the closing operation of the handle.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to an automatic closing device suitable for small circuit breakers. Background technique [0002] With the development of smart grid, miniature circuit breakers with remote operation function, such as prepaid miniature circuit breakers, are in increasing demand. New requirements have also been put forward for the functions of prepaid miniature circuit breakers. In addition to the overload and short circuit protection of the circuit breaker and the remote monitoring of the arrears and power outages of the smart grid, the requirements for the products after opening are also constantly proposed. Requirements for automatic closing technology, overvoltage and undervoltage protection technology, and remote control technology. [0003] In the prior art, the automatic closing technology of the circuit breaker is mainly realized by a motor and a transmission mechanism. For example, in one pr...

AI Technical Summary

Problems solved by technology

[0005] The automatic closing device realized by the motor and transmission mechanism has a large volume due to the use of many components, which is limited in the application of small circuit breakers

Another type of automatic closing device is realized by thermal elements. In the prior art, the number of automatic closing devices based on thermal elements is small, the technology is immature, and the application is not popular.

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