Safety device with cable or rope cutting in an explosive environment

A device for automatically releasing a mechanical cable or rope connection between two elements, in a zone having explosive atmosphere conditions, said device comprising:

• a mechanical assembly in the form of an enclosure that can be traversed by a cable or rope and that contains at least one sectioner for cutting the cable or rope, means for positioning the cable or rope, and means for measuring the tension of the cable or rope,
• control means making it possible to automatically control the triggering of the sectioner,
• in which device the enclosure is subdivided into at least two chambers:
• a main chamber that can be traversed by the cable or rope and that contains at least said sectioner, said means for positioning the cable or rope, and said means for measuring the tension of the cable or rope, and at least one adjacent side expansion chamber, the inner wall separating the main chamber from the side expansion chamber being provided with a plurality of orifices and serving as a flame arrester.