Arc extinguishing device for molded case circuit breaker and molded case circuit breaker

Abstract

The invention discloses an arc extinguishing device of a molded case circuit breaker and a molded case circuit breaker, wherein the plastic arc extinguishing device includes an arc extinguishing chamber, a white steel cardboard and an arc isolation member which are connected in sequence, and the arc extinguishing chamber includes The arc-extinguishing grid and the splint on both sides, the arc-extinguishing grid includes a U-shaped piece at the front end and a W-shaped piece at the rear end, the opening of the U-shaped piece is in the direction of the arc, and the W-shaped piece is on With uniform small holes, the splint is clamped on both sides of the U-shaped piece, the bottom surface of the W-shaped piece is perpendicular to the splint, and one side of the W-shaped piece is parallel to the The bottom surface of the U-shaped sheet is attached, the white steel cardboard is U-shaped, one side of the white steel cardboard is attached to the outer side of the W-shaped piece, and the arc blocking piece is U-shaped, One side surface of the arc-blocking member is attached to the outer side surface of the white steel cardboard. The arc extinguishing device of the invention has the advantages of simple structure, low cost and good arc extinguishing effect.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing device of a molded case circuit breaker and a molded case circuit breaker. Background technique [0002] Nowadays, people's life is inseparable from electrical energy, and various protectors for protecting circuits have emerged as the times require. Among them, the molded case circuit breaker is one of the common circuit protectors, which is used for circuit overload and short circuit protection, that is, when the circuit is short-circuited or overloaded, the tripping mechanism of the molded case circuit breaker automatically cuts off the circuit to protect the circuit. . In the process of cutting off the circuit, a large number of arcs will be generated. The arc generation is accompanied by high temperature and high pressure. If the arc is not evacuated in time, it will easily break down or burn the MCCB, which will seriously affect the breaking ca...

AI Technical Summary

Problems solved by technology

In the process of cutting off the circuit, a large number of arcs will be generated. The generation of arcs is accompanied by high temperature and high pressure. If the arc is not evacuated in time, it is easy to break down or burn the molded case circuit breaker, which seriously affects the breaking capacity of the molded case circuit breaker.

[0003] Shock waves are formed when large currents or short circuits are broken, and unacceptable breaking and explosion noises are formed, which affect the use environment of circuit breakers; in addition, they cause cracking of molded case circuit breakers, and cause molded case circuit breakers after long-term and repeated discharge work Fatigue damage of circuit breaker components, affecting the reliability of the circuit breaker and shortening the service life

At the same time, it is difficult to achieve rapid arc extinguishing for high-current breaking of molded case circuit breakers, and after-arc re-strike may occur from time to time, resulting in breaking failure

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