Circuit interrupter

A circuit interrupter, comprising:

• a fixed terminal including a fixed contact;
• a movable contactor including a movable contact connected to the fixed contact;
• a squib configured to generate gas by combustion;
• a first moving mechanism including an excitation coil configured to move the movable contactor from a closed position where the movable contact is connected to the fixed contact to a first open position where the movable contact is separated from the fixed contact and a shaft with the movable contact coupled to one end and configured to move inside the excitation coil in the first open position;
• and
• a second moving mechanism including the squib and configured to move the movable contactor to a second open position where the movable contact is separated from the fixed contact to interrupt an abnormal current.

A circuit interrupter, comprising:

• a fixed terminal including a fixed contact;
• a movable contactor including a movable contact connected to the fixed contact;
• a moving mechanism configured to move the movable contactor from a closed position where the movable contact is connected to the fixed contact to an open position where the movable contact is separated from the fixed contact;
• a squib configured to generate gas by combustion;
• a case accommodating the squib and having a sleeve;
• and
• an accommodation for accommodating the fixed contact and the movable contactor;
• wherein the moving mechanism includes a piston accommodated in the sleeve;
• the gas moves the piston from a first position to a second position, and the piston moves the movable contactor from the closed position to the open position, when the squib generates the gas;
• and
• an inner diameter of the sleeve is tapered so as to become narrower in a direction from the first position to the second position and configured to hold the piston to maintain the force on the movable contactor in the direction toward the open position.