Abstract: A circuit breaker includes, a cylindrical portion having a gunpowder and a exploding unit for exploding the gunpowder by application of electric power to the gunpowder, the cylindrical portion being provided with an opening at at least one end; a base material securing the cylindrical portion, at least the surface of which is made of insulating material; a conductor fixed to the base material and having a break portion located at a position opposite to the opening of the cylindrical portion, the break portion being broken by explosive force of the gunpowder; a first metallic cover portion covering the cylindrical portion and the break portion; and a second metallic cover portion covering the base material from an opposite side to the cylindrical portion, wherein the first and second cover portions are fixed to the base material by directly connecting the first and second cover portions each other.

Abstract: A gas generator for an air bag, including a combustion chamber and a hermetic container accommodated in the combustion chamber. Gas generant pellets are charged in the hermetic container. The hermetic container has a wall adapted to be destroyed during combustion of the gas generant pellets. A partition foil piece covers a surface formed by the gas generant pellets charged in the hermetic container so as to conform to a profile of the surface formed by the gas generant pellets. The partition foil piece is non-reactive with the gas generant pellets and has a strength lower than that of the hermetic container. A cushioning member presses the partition foil piece toward the gas generant pellets by a resilient force of the cushioning member so as to suppress movement of the gas generant pellets charged in the hermetic container.