A contact arc extinguishing system, a low-voltage circuit breaker and an arc extinguishing system

Abstract

The invention provides a contact arc extinguishing system, a low-voltage circuit breaker and an arc extinguishing system. The contact arc extinguishing system comprises a contact system, an arc extinguishing system and a low-voltage circuit breaker, wherein the contact system comprises a movable contact and a fixed contact, and the movable contact is provided with a main contact and an arc contactwhich can be in contact with or be separated from the fixed contact; the arc extinguishing system is provided with an arc extinguishing chamber positioned above the contact system, the arc extinguishing chamber is internally provided with an insulating passage and a multistage narrow slit which is positioned above the insulating passage and communicates with the insulating passage, the width of the multistage narrow slit is decreased stage by stage from bottom to top, the arc contact is positioned inside the insulating passage, and the main contact is positioned outside the arc extinguishingsystem; and the low-voltage circuit breaker comprises the contact arc extinguishing system. The breaking capacity of the circuit breaker under the high voltage of more than AC 1000 V can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of low-voltage circuit devices, in particular to a contact arc extinguishing system for a circuit breaker, a low-voltage circuit breaker and the arc extinguishing system. Background technique [0002] Universal circuit breaker (abbreviated as ACB) is a circuit breaker commonly used in low-voltage power distribution equipment, and is currently the most intelligent protective device in the field of low-voltage electrical appliances. [0003] With the continuous expansion of the application field of low-voltage electrical appliances, many industries use a large number of large-scale and high-power equipment, so the requirements for power supply in power engineering continue to increase. Correspondingly, the voltage requirements for universal circuit breakers used in circuit protection systems are also increasing. Higher and higher. At present, many industries (such as coal mines and ships) have transformed the...

AI Technical Summary

Problems solved by technology

[0004] The current universal circuit breaker can meet the requirements of AC1000V working voltage, but there is a problem of low breaking capacity under the working voltage of AC1000V and above.

[0005] The use of double break point contact system is a common technology to improve the breaking capacity, but if this technology is applied to the universal circuit breaker, the structure of the circuit breaker will inevitably be more complicated, especially when the product is closed and disconnected, the contact Synchronization is difficult to control. If the double breakpoint structure is used, the manufacturing cost of the product will be greatly increased, and the performance parameters are difficult to control. Therefore, there is no universal circuit breaker with double contact structure on the market. The structure is not the preferred solution to improve the breaking capacity of the circuit breaker

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