Table 2 presents some of the gases and gas mixtures that have been researched for the replacement of SF\({}_{6}\) in medium and high voltage electrical switchgear, and their relative breakdown strength (\(E_{rel}\)), _GWP_, boiling temperature (\(T_{B}\)), lifetime (\(LT\)) in the atmosphere, toxicity threshold limit value-time weighted average (_TLV-TWA_), and decomposition products. The boiling temperature of all these gases is higher than the minimum operating temperature of outdoor medium voltage switchgear of 248 K, according to IEC 62271-200, except C\({}_{3}\)F\({}_{8}\), so the gases must be diluted with a carrier gas to ensure that they do not liquefy in any circumstance. The most common carrier gases are the natural gases, CO\({}_{2}\), N\({}_{2}\), and dry air. The dielectric strength of the components is similar to that of SF\({}_{6}\), even after mixing them with the carrier gas, and the highest _GWP_ is 70% lower. Besides, the lifetime in the atmosphere is lower than 20 days for the components CF\({}_{3}\)I, C\({}_{3}\)F\({}_{4}\)H\({}_{2}\), C\({}_{5}\)F\({}_{10}\)O, and C\({}_{6}\)F\({}_{12}\)O. Furthermore, the TLV-TWA values of all the gas mixtures are lower than the one of SF\({}_{6}\); however, as they need to be mixed with a carrier gas, the toxicity decreases. The key to identifying what could be a suitable alternative is to find a component with low _GWP_ that preserves a high dielectric strength when it is diluted with a vector gas to reduce the boiling temperature. Various researchers have already presented patents for some of these gas mixtures for their use in medium and high voltage switchgear [19; 20; 21; 22]. \begin{table} \begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Component**} & \multirow{2}{*}{**Mixture**} & \multirow{2}{*}{\(E_{rel}\)} & \multirow{2}{*}{\(\textbf{GWP}_{100}\)} & \(\textbf{T_{B}}\) & \(\textbf{LT}\) & _TLV-TWA_ & \multirow{2}{*}{**Decomposition Products**} & \multirow{2}{*}{**Ref.**} \\  & & & & & & & & & \\  & & & & & & & & \\ \hline Sulfur hexafluoride (SF\({}_{6}\)) & Pure & 1 & 23,500 & 209 & 3200 & 1000 & \begin{tabular}{c} COF\({}_{2}\), F\({}_{2}\), HF, H\({}_{2}\),S, NF\({}_{3}\), F\({}_{2}\)O, SO\({}_{2}\), \\ S\({}_{2}\)F\({}_{10}\), SF\({}_{4}\), SO\({}_{2}\)F\({}_{10}\)O, \\ \end{tabular} & [1; 23; 24] \\ \hline Trifluoriodomethane (CF\({}_{3}\)I) & \begin{tabular}{c} Pure \\ 30\% CF\({}_{3}\)I/CO\({}_{2}\) \\ \end{tabular} & 1.2 & \multirow{2}{*}{\(<\)5} & 251 & 0.005 & 150 & \begin{tabular}{c} CF\({}_{4}\), C\({}_{2}\)F\({}_{6}\), C\({}_{2}\)F\({}_{4}\), C\({}_{5}\)F\({}_{6}\), C\({}_{4}\)F\({}_{8}\), \\ C\({}_{2}\)F\({}_{5}\)I, C\({}_{3}\)F\({}_{7}\)I, C\({}_{2}\)F\({}_{6}\)O, C\({}_{3}\)F\({}_{7}\)I \\ \end{tabular} & [2; 25; 26; 27] \\ \hline Trifluoromethanesulphonyl & \begin{tabular}{c} Pure \\ 50\% \\ CF\({}_{3}\)SO\({}_{2}\)F\({}_{7}\)/N\({}_{2}\) \\ \end{tabular} & 1 & 3678 & 251 & 40 & * & No products after alternating & [28; 29; 30] \\ \hline Octafluoropropane (C\({}_{3}\)F\({}_{8}\)) & \
\begin{tabular}{c} Pure \\ 20\% C\({}_{3}\)F\({}_{8}\)/N\({}_{2}\) \\ \end{tabular} & 0.9 & \multirow{2}{*}{236} & \multirow{2}{*}{260} & \multirow{2}{*}{47} & \multirow{2}{*}{65} & \multirow{2}{*}{[31; 32; 33]} \\  & & & & & & & & \\  & & 20\% C\({}_{3}\)F\({}_{8}\)/N\({}_{2}\) \\ \end{tabular}  & 0.6 & 7000 & 236 & 260 & & & \\ \hline \multirow{3}{*}{Heptafluoroobutronitrile (C\({}_{4}\)F\({}_{7}\)N)} & Pure & 2 & \multirow{3}{*}{2100} & \multirow{3}{*}{268} & \multirow{3}{*}{47} & \multirow{3}{*}{65} &
\begin{tabular}{c} CF\({}_{4}\), C\({}_{2}\)F\({}_{6}\), C\({}_{3}\)F\({}_{6}\), C\({}_{5}\)F\({}_{6}\), C\({}_{7}\)F\({}_{8}\), C\({}_{2  
Binary and ternary mixtures made with the hydrofluorodefin C\({}_{3}\)F\({}_{4}\)H\({}_{2}\), also known as HFO-1234 ze(E), and the perfluoroketone C\({}_{5}\)F\({}_{10}\)O, have been studied. They will be referred to as HFO3E and PFK5, respectively, and their molecular structures are shown in Figure 1. These gases have been selected by Ormazabal Corporate Technology.