Electric circuit breaker device

An electric circuit breaker device comprising:

• an igniter provided to a housing;
• a projectile that is disposed in a movement path formed in the housing, the projectile formed to be movable in the movement path by receiving energy from the igniter;
• a conductor piece that forms one portion of a predetermined electric circuit, the conductor piece having two end portions connected to respective other portions of the predetermined electric circuit, the conductor piece having a first portion between both the end portions arranged to traverse the movement path;
• an insulated space that is formed on a side opposite to the projectile with the conductor piece in-between before the igniter is actuated, the insulated space connected to the movement path;
• a sensor that is connected to a first part positioned between both the end portions and to a second part that is between both the end portions and is different from the first part, the sensor configured to detect current flowing through the conductor piece between both the end portions, the sensor disposed to be integrated with the conductor piece;
• and
• a control unit that controls actuation of the igniter, based on the current detected by the sensor.