Patent ID: 8350168

Claim:
An interrupter unit for a circuit breaker, comprising: a rotary arm assembly including a rotating member and first and second arms, each of the arms being rigidly coupled to the rotating member such that the arms are configured to rotate in unison with the rotating member about an axis of rotation and such that the first arm does not overlap the second arm about the axis of rotation, each of the arms having a first end and a second end, the first end of the first arm including a first moveable contact, the second end of the first arm including a second moveable contact, the first end of the second arm including a third moveable contact, and the second end of the second arm including a fourth moveable contact; a line terminal including a first stationary contact that is configured to be electrically connected with the first moveable contact; an intermediate terminal including a second stationary contact configured to be electrically connected with the second moveable contact and a third stationary contact configured to be electrically connected with the third moveable contact; a load terminal including a fourth stationary contact configured to be electrically connected with the fourth moveable contact; and a driving member having a closed position and a tripped position, the driving member being coupled to the rotary arm assembly via a biasing member, the biasing member biasing the rotary arm assembly such that the moveable contacts are positioned to electrically couple with the respective stationary contacts in response to the driving member being in the closed position, the driving member being configured to rotate the rotary arm assembly to separate the moveable contacts from the respective stationary contacts such that the moveable contacts are electrically insulated from the stationary contacts in response to the driving member switching from the closed position to the tripped position.