Abstract: A circuit breaker has a stationary contact arm (2) having a stationary contact (3), a first contact arm (107) having a contact (6) for contacting the stationary contact (3) and an extended terminal portion (107) for connecting a flexible wire (8) and a second contact arm (110) for pivoting the first contact arm, and a third contact arm (110a) that pivots about a common axis of the second contact arm and is provided with a flattened U-shaped aperture (114) thereon, and which is connected with an oblong aperture of the second contact arm by a connecting member (16).

Abstract: A multi-pole circuit interrupter having a first pole unit provided with an operating mechanism and a second pole unit provided with no operating mechanism for interrupting current flowing therethrough by separating a movable contact from a stationary contact as a result of an electromagnetic repulsive force generated upon occurrence of a large overcurrent irresepective of the automatic trip operation of an operating mechanism. Each of the pole units of the circuit interrupter comprises a contact arm assembly for supporting the movable contact including a first contact arm and a second contact arm pivotally supported by a common pivot pin. The first contact arm in the first pole unit has an elongated guide hole extending in a direction of movement of the movable contact and is directly connected to the operating mechanism. The first contact arm in the second pole unit is connected to the operating mechanism through a cross bar.