% Author: Dr. Matthias Jung, DL9MJ
% Year: 2020
\begin{circuitikz}
    %\tikzstyle{help lines}=[blue!50];
    %\draw[style=help lines] (-6,-4) grid (16,4);
    \draw(0,0)
        to [short, o-] ++(4,0) coordinate(dc0)
        to [short, -o] ++(2,0);
    \draw(0,3) to [R, o-] ++(4,0) coordinate(dc1)
               to [short, -o] ++(2,0);
    \draw(dc0)
        to [stroke Zener diode, mirror, *-*] (dc1);
\end{circuitikz}