Arc chute, arc extinguishing chamber, and circuit breaker

The invention relates to an arc chute, an arc extinguishing chamber, and a circuit breaker. The arc chute is a plate body and is characterized in that the plate body of the arc chute is formed by folding one sheet material so that the sheet material has upper and lower portions stacked up and down. A gap is arranged between the upper portion and the lower portion and a plate insulating member is embedded in the gap between the upper portion and the lower portion. The plate insulating member is added to the arc chute so as to reduce the probability that adjacent short arcs are integrated and toprovide support for the further improvement of the miniaturization and breaking capacity of a circuit breaker. 本发明涉及种灭弧栅片及其灭弧室，其为片状体，其特征在于：所述灭弧栅片的片状体是由片材对折而成，使之具有上下相叠的上层部分和下层部分，上层部分和下层部分之间留有间隙，且所述上层部分和下层部分的间隙中嵌置有片状绝缘件。本发明是在灭弧栅片中增加片状绝缘件，有效降低相邻短弧串成体的概率，为断路器的小型化、分断能力的进步提升提供支持。