The following issues are associated with SF6 circuit breakers
Greenhouse gas
SF6 is the most potent greenhouse gas that the Intergovernmental Panel on Climate Change has evaluated. It has a global warming potential that is 23,900 times worse than CO2.[3] SF6 has been classified as a restricted gas under the Kyoto Protocol.[4]
Toxic lower order gases
When an arc is formed in SF6 gas small quantities of lower order gases are formed. Some of these byproducts are toxic and can cause irritation to eyes and respiratory system.
Oxygen displacement
SF6 is heavier than air so care must be taken when entering low confined spaces due to the risk of oxygen displacement.
__________________
Henry Ford Coming together is a beginning. Keeping together is progress. Working together is success.