Austdac has advised that the affected units are SR50 and SR100A self rescuers that are beltworn and are more than five years old.

This also applies to belt worn units that have been re-assigned as cached units (cached units which have not been used as belt worn units are not affected).

The manufacturing date can be found on the stainless steel clamping band.

“Mine operators should withdraw all affected units from service immediately,” Mine Safety NSW said in an alert.