Major loop structure of double-breaking-point universal circuit breaker

The invention relates to a major loop structure of a novel double-breaking-point universal circuit breaker. The major loop structure mainly comprises an upper fixed contact bus, an upper fixed contact, an upper movable contact, an upper movable contact supporting piece, a movable contact flexible connection device, a lower movable contact supporting piece, a lower movable contact, a lower fixed contact, a lower fixed contact bus, a bus flexible connection device and a lower connection bus. The upper fixed contact and the lower fixed contact are fixedly connected to the upper fixed contact bus and the lower fixed contact bus respectively. The upper movable contact and the lower movable contact are fixedly connected to the upper movable contact supporting piece and the lower movable contact supporting piece respectively. The two ends of the movable contact flexible connection device are electrically connected with the upper movable contact supporting piece and the lower movable contact supporting piece respectively. The two ends of the bus flexible connection device are electrically connected to the lower fixed contact bus and the lower connection bus respectively. The major loop structure of the double-breaking-point universal circuit breaker has the greatest advantage that the electrical property balance degree of the upper contact system and the lower contact system is greatly improved.