▎ 摘　　要

NOVELTY - The utility model claims a circuit breaker, which can match with each other to form a chamber of the first shell and the second shell and a delay system, the operation system is set in the chamber and electric contact system. electrical contact system with static contact and moving contact are matched with each other. circuit breaker with a switch closed state the static contact and moving contact and the moving contact and the static contact is isolated switch open state. delay system capable of actuating operating system in response to the occurrence of a failure, the operating system such that the movable contact is separated from the fixed contact so that the breaker switch to switch open state from the closed state of the switch. movable contact and/or the static contact is composed of graphene/silver-based composite material. The utility model can effectively reduce the contact resistance between the contacts and improve the temperature rise of contact, improves the hardness of the contact surface and the contact arc ablation resistance, so as to improve electrical performance and service life of the breaker. The utility model further relates to mounting the breaker of the electric device.