Patent ID: 6985059

Claim:
A circuit breaker comprising: a base and a cover; a cassette disposed within said base; an operating mechanism disposed atop said cassette with a handle yoke having a projection extending therefrom, said handle yoke being movable between an on position and an off position; a rotary contact structure disposed with said cassette, said rotary contact structure having a contact arm supporting at least one contact, said contact arm being movable between a closed position and an open position; and a crank operably coupled to said handle yoke and said rotary contact structure to move said contact arm from the closed position to the open position when said handle yoke is moved from the on position to the off position, said crank having a blocking lever extending therefrom, said blocking lever interacting with said projection of said handle yoke to prevent said handle yoke from being moved to the off position when said contact arm is fixed in the closed position.