Novel circuit breaker

Abstract

The invention discloses a novel circuit breaker, which comprises a shell, a first wiring terminal, a second wiring terminal, an arc plate, U-shaped arc plates, an end tab, a static contact and a moving contact, wherein the first wiring terminal and the second wiring terminal are arranged at the left end and the right end of the shell respectively; an arc extinguishing grid piece set composed of arc plates distributed up and down at intervals is arranged on the left side in the shell; the static contact is arranged on the upper right portion of the arc plate; the U-shaped arc plates are inserted between the arc plates; the moving contact is arranged on the right side of the static contact; and the end tab is connected with the second wiring terminal. Thus, as the electromagnetic driving force is enhanced, a series of problems caused by the weak electromagnetic driving force of individual positions in the moving process of the arc are avoided; a strong gas production material is not adopted any more, and the gas pressure in the arc extinguishing process is reduced, so that the phenomenon that the arc is blown out of the arc extinguishing grid sheet set by the high-pressure gas to cause breakdown and reignition of the arc behind the arc extinguishing grid sheet set is avoided. Therefore, the short circuit breaking capacity and the reliability of the circuit breaker are effectivelyimproved.

Description

Technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a new type of circuit breaker. Background technique [0002] The arc extinguishing device of a miniature circuit breaker is usually composed of an arc running path connecting a pair of moving and static contacts with the arc extinguishing chamber, an arc extinguishing grid group and an exhaust duct. See attached figure 1 As shown, in the case of a short circuit in the circuit, a short-circuit arc is first generated between the static contact and the moving contact, and then moves in the arc extinguishing direction under the use of the electromagnetic force generated by the U-shaped current path, and the arc transfers to arcing. After the passage, it is accelerated under the action of electromagnetic force and high-temperature air pressure and enters the arc extinguishing grid group to burn, cool down and extinguish. This is the basic working process of the arc extinguishing d...

AI Technical Summary

Problems solved by technology

[0003] However, the existing arc extinguishing devices are often prone to the following three defects: 1. The arc cannot enter the arc strike plate smoothly, causing the moving contact 11 to be burned by the arc, resulting in the inability to connect the circuit; Jump back and forth between the two contacts and the arc strike plate, and continue to burn until the arc strike plate 12 burns out, thereby destroying the circuit breaker; 3. The arc enters the arc extinguishing grid under the action of electromagnetic force and high temperature air pressure (unstable) After the sheet group continues to move to the end 13 of the grid sheet group, the phenomenon of back breakdown occurs, and the back breakdown causes the arc to continue to burn, the short circuit energy cannot be suppressed, and the circuit breaker fails

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