Contact system of plastic case breaker

The invention discloses a contact system of a low-voltage switch device, such as, a circuit breaker, the contact system utilizes the principle of combining the electromagnetic repulsive force and thegas pressure, a structure with a moving contact and a static contact which can simultaneously swing and be repulsed and an automatic magnetic blow-out system, thus being able to accelerate the breaking speed between the moving contact and the static contact, widen the repulsion distance between the moving contact and the static contact, accelerate the arc extinguishment and further enhance the performance indicators for rapid flow limit and arc extinguishment. The contact system of the invention has compact structure, small volume and low production cost.