Contact arc extinguishing system of circuit breaker

The contact arc extinguishing system of the circuit breaker comprises a contact system and an arc extinguishing chamber, the contact system comprises a moving contact and a static contact, the moving contact comprises a short contact piece and a long contact piece, the short contact piece is provided with a moving contact, the long contact piece is provided with a moving arc contact, the static contact is provided with a static contact and a static arc contact, and the short contact piece and the long contact piece are connected with each other. The static contact corresponds to the moving contact, the static arc contact corresponds to the moving arc contact, and the circuit breaker is characterized in that a first distance d1 between the moving contact and the static contact is greater than a second distance d2 between the moving arc contact and the static arc contact in the process of opening the moving contact. The advantages are that the spacing structure is arranged to ensure that the distance between th