Arc extinguishing insulation device for breaker

The utility model relates to the field of breaker technology, especially to an arc extinguishing insulation device for a breaker. The utility model solves the problems that an arc extinguishing device of a conventional breaker is difficult to mount, complex in technology, unsuitable for mass production and unsatisfactory in arc extinguishing performance. The arc extinguishing insulation device for the breaker is provided with a box-shaped casing prepared by insulating materials in the breaker, wherein the box-shaped casing is provided with a plurality of arc extinguishing chambers each of which is provided with an arc extinguishing device therein, and insulating layers are arranged between shells of the arc extinguishing devices and those of the arc extinguishing chambers. Each extinguishing chamber can form a standard single electrode unit by the box-shaped casing. The arc extinguishing insulation device for the breaker is durable and beautiful, simple to install, good in arc extinguishing and insulating per