documentclass[14pt]{extarticle}

usepackage[utf8]{inputenc}
usepackage[english]{babel}
usepackage{zi4}

begin{document}
Huge texttt{I need only latin here} % I see Inconsolata here
end{document}

documentclass[14pt]{extarticle}

usepackage[utf8]{inputenc}
usepackage[english,russian]{babel}
usepackage{zi4}

begin{document}
Huge texttt{I need only latin here}
end{document}

LaTeX Font Warning: Font shape `T2A/zi4/m/n' undefined
(Font)              using `T2A/cmr/m/n' instead on input line 8.

documentclass[14pt]{extarticle}
usepackage[OT1,T2A]{fontenc}
usepackage[utf8]{inputenc}
usepackage[english,russian]{babel}
usepackage{zi4}

newcommand{latinttfamily}{fontencoding{OT1}ttfamily}
DeclareTextFontCommand{ltexttt}{latinttfamily}

begin{document}
Huge Спасибо ltexttt{abc}
end{document}