Gas generator and manufacturing process thereof

A gas generator comprising:

• an electropyrotechnic initiator;
• and
• an assembly containing a gas generator for releasing at least one gas following ignition of the electropyrotechnic initiator;
• the initiator includes a case containing a pyrotechnic charge of the initiator and two electrodes jutting out outwards from the case for electrically controlling the ignition of the pyrotechnic charge of the initiator, the initiator further including a cap which caps the case on a gas generating side, the gas generator further includes a determined portion delimiting a first aperture for accessing the electrodes of the initiator from the outside and a retaining part obtained by overmoulding plastic material in the first aperture between the initiator, the cap and the determined portion, the retaining part for retaining the initiator and holding the initiator in position relatively to the determined portion, the electrodes crossing outwards the first aperture and the retaining part, the cap including a bottom integral with a side wall delimiting a second aperture into which the case is inserted, the wall having a first protrusion used for retaining the cap in a corresponding recess of the retaining part, wherein a side wall of the cap includes, in proximity to the second aperture and to the first protrusion used for retaining the cap, at least one other second mould-supporting protrusion in a supporting direction having a component from the bottom towards the second aperture, the other second mould-supporting protrusion being distinct from the first protrusion and having an outer edge at least partly not covered by the retaining part so as to be used as a supporting surface along the direction supporting a mould which is to be used for overmoulding.