Electrical switch comprising: - a first conductive terminal comprising a first contact portion, - a second conductive terminal comprising a second contact portion, - a moveable body with a first and second contact surfaces (32, 33) arranged on an electric conductive portion, and moveable from a first position, in which the first and second contact portions (11, 21) are electrically disconnected, to a second position, in which the first and second contact portions (11, 21) are electrically connected respectively by the first and second contact surfaces (32, 33), - a combustion chamber, closed by the moveable body, - an electrical pyrotechnic device arranged to generate pressurizing gas in the combustion chamber to move the moveable body from the first position to the second position, characterized: - in that each of said first and second conductive terminals (10, 20) presents an elongated flat end portion and in that the first and second contact portions (11, 21) are cylindrical openings crossing a thickness of the respective elongated flat end portion of each conductive terminal, - in that said first and second contact surfaces (32, 33) are cylinders parallel to respectively said first and second contact portions (11, 21), - in that said second contact surface has a length arranged so that the first contact surface enters in connection with the first contact portion simultaneously to the moment when the second contact surface enters in connection with the second contact portion, - and in that at least one of first and second contact surfaces (32, 33) and the corresponding one of the first and second contact portions (11, 21) are arranged so that the moveable body is maintained in the second position. - a first conductive terminal comprising a first contact portion, - a second conductive terminal comprising a second contact portion, - a moveable body with a first and second contact surfaces (32, 33) arranged on an electric conductive portion, and moveable from a first position, in which the first and second contact portions (11, 21) are electrically disconnected, to a second position, in which the first and second contact portions (11, 21) are electrically connected respectively by the first and second contact surfaces (32, 33), - a combustion chamber, closed by the moveable body, - an electrical pyrotechnic device arranged to generate pressurizing gas in the combustion chamber to move the moveable body from the first position to the second position, - in that each of said first and second conductive terminals (10, 20) presents an elongated flat end portion and in that the first and second contact portions (11, 21) are cylindrical openings crossing a thickness of the respective elongated flat end portion of each conductive terminal, - in that said first and second contact surfaces (32, 33) are cylinders parallel to respectively said first and second contact portions (11, 21), - in that said second contact surface has a length arranged so that the first contact surface enters in connection with the first contact portion simultaneously to the moment when the second contact surface enters in connection with the second contact portion, - and in that at least one of first and second contact surfaces (32, 33) and the corresponding one of the first and second contact portions (11, 21) are arranged so that the moveable body is maintained in the second position.