Mein LaTeX-Forum

\documentclass[numbers=noenddot,a4paper,12pt,listof=totoc,bibliography=totoc]{scrbook}
\usepackage{blindtext}
\usepackage{siunitx}
\usepackage{amsmath}

\begin{document}
\chapter{Introduction}
\begin{equation}
   V=\SIrange{10}{30}{\volt}
\end{equation}
\end{document}
 

% arara: pdflatex
\documentclass{scrartcl}
\usepackage{amsmath}
\usepackage{siunitx}

\begin{document}
Wie erwartet:
\begin{align}
   V&=\SIrange{10}{30}{\volt} \\
    &=\SI{10}{\volt} to \SI{30}{\volt}
\end{align}
\SIrange{10}{30}{\volt}

\sisetup{range-phrase=\ensuremath{\text{ to }}}
\begin{equation}
 V=\SIrange{10}{30}{\volt}
\end{equation}
\SIrange{10}{30}{\volt}

\end{document}