Air circuit interrupter

An air circuit interrupter comprising;

• a first cam driven to be rotated by the handle operation of the circuit interrupter;
• a charge lever in rolling contact with said first cam for rotation;
• an energy storing spring chargeable by said charge lever;
• a link mechanism for transmitting the stored spring force in said spring to the side of a contact operating mechanism;
• a contact-opening-waiting mechanism for preventing said link mechanism from driving said contact operating mechanism to open when the contact is closed by an action of a spring force of a contacting pressure spring in said contact operating mechanism and an electromagnetic repulsive force acting on a current carrying member due to a current above a predetermined value;
• and an OFF operating member for opening the contact by releasing the contact-opening-waiting state by said contact-opening-waiting mechanism;
• said contact-opening-waiting mechanism comprising a second cam connected to said link mechanism and a trip latch having an engaging roller for engaging said second cam and an engaging portion for engaging said OFF operating member,
• said trip latch comprising a roller side latch half member having said engaging roller, an engaging side latch half member having said engaging portion, said half members being pivotally mounted on a common shaft, and an elastic member inserted between said half members so that they are biased away from each other, said half members of said trip latch being displaced toward each other against said elastic member by said action to release said contact-opening-waiting state to open the contact.