An automatic fire extinguishing system, comprising: a canister having a central axis; an outlet port disposed on the canister; a nozzle manifold and nozzle, wherein the outlet port is disposed between the canister and the nozzle manifold; a dip tube disposed in the canister about the central axis; an electric actuator coupled to the canister; a propellant gas mixture having a first propellant gas and a second propellant gas within the canister; a gaseous fire suppression agent disposed in the canister; and a dry powder fire suppression agent disposed in the dip tube, wherein the dry powder fire suppression agent is discharged at the early stages of the overall extinguisher discharge; characterised in that: the dip tube comprises: dip tube side holes; an inlet port having a number of inlet openings at the axial end of the dip tube remote from the outlet port, which are covered by a semi-permeable membrane; and an internal ring that is coupled to a central rod, which is disposed in the canister and the dip tube about the central axis; wherein the dip tube is in partial fluid communication via the semi-permeable membrane with the canister and is coupled to the outlet port; and the electric actuator after actuation is mechanically coupled to the central rod, wherein driving of the central rod causes shifting of the internal ring, which uncovers the internal ring from the dip tube side holes. a canister having a central axis; an outlet port disposed on the canister; a nozzle manifold and nozzle, wherein the outlet port is disposed between the canister and the nozzle manifold; a dip tube disposed in the canister about the central axis; an electric actuator coupled to the canister; a propellant gas mixture having a first propellant gas and a second propellant gas within the canister; a gaseous fire suppression agent disposed in the canister; and a dry powder fire suppression agent disposed in the dip tube, wherein the dry powder fire suppression agent is discharged at the early stages of the overall extinguisher discharge; characterised in that: the dip tube comprises: dip tube side holes; an inlet port having a number of inlet openings at the axial end of the dip tube remote from the outlet port, which are covered by a semi-permeable membrane; and an internal ring that is coupled to a central rod, which is disposed in the canister and the dip tube about the central axis; wherein the dip tube is in partial fluid communication via the semi-permeable membrane with the canister and is coupled to the outlet port; and the electric actuator after actuation is mechanically coupled to the central rod, wherein driving of the central rod causes shifting of the internal ring, which uncovers the internal ring from the dip tube side holes. the dip tube comprises: dip tube side holes; an inlet port having a number of inlet openings at the axial end of the dip tube remote from the outlet port, which are covered by a semi-permeable membrane; and an internal ring that is coupled to a central rod, which is disposed in the canister and the dip tube about the central axis; dip tube side holes; an inlet port having a number of inlet openings at the axial end of the dip tube remote from the outlet port, which are covered by a semi-permeable membrane; and an internal ring that is coupled to a central rod, which is disposed in the canister and the dip tube about the central axis; wherein the dip tube is in partial fluid communication via the semi-permeable membrane with the canister and is coupled to the outlet port; and the electric actuator after actuation is mechanically coupled to the central rod, wherein driving of the central rod causes shifting of the internal ring, which uncovers the internal ring from the dip tube side holes.