The oxygen self-rescuer MSA SSR 30/100 is a small, robust respiratory protective devices for self-rescue, which can be used at every place where the ambient atmosphere may be oxygen deficient or contain toxic contaminants. These devices employ the well-known and worldwide proven principle of generating oxygen chemically. Due to its compact design and low weight, the oxygen self rescuer can be worn continuously on the belt so that it is available immediately in an emergency situation. It is donned in seconds and supplies oxygen to the wearer on their escape or while waiting for rescue.