A double-
breakpoint circuit breaker for a
direct current system is characterized in that the double-
breakpoint circuit breaker comprises an operating
handle (1), the operating
handle (1) is linked with a rotating shaft (3) through an upper connecting rod (2), a jump pin (6) and a lock catch (7), the rotating shaft (3) is connected with a double-
breakpoint moving
contact system (a) through a lower connecting rod (4), and the rotating shaft (3) can be driven to rotate through the upper connecting rod (2), the jump pin (6) and the lock catch (7) in the rotating process of the operating
handle (1). And the rotating shaft (3) can drive the double-breakpoint moving
contact system (a) to move up and down through the lower connecting rod (4) in the rotating process, so that the double-breakpoint moving
contact system (a) and the corresponding double-breakpoint static contact
system (b) are contacted and separated to realize the on-off of the
circuit breaker. According to the circuit breaker, the rotation of the handle is converted into the up-and-down movement of the moving contact
system through the improvement of the rotating shaft structure and the installation position, the purpose of double breakpoints is achieved, and the up-and-down movement of the double-breakpoint moving contact system is not required to be linear movement. The moving contact keeps a trend of rotating towards two sides under the action of the pressure spring so as to realize
close contact with the static contact
assembly, the installation difficulty of a product is simplified, the reliability and the
stability of motion transmission are improved, meanwhile, due to the
layout of the whole circuit breaker, more arc extinguishing grid sheets can be arranged in the circuit breaker, and the
breaking capacity of the circuit breaker is improved.