Wie kann ich in Circutikz ein Bauteil ausblenden?

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[siunitx,fetbodydiode,smartlabels]{circuitikz}
\usetikzlibrary{positioning}
\begin{document}

\begin{figure}
\centering

  % Based on a template by Erno Pentzin (2013), http://www.texample.net/tikz/examples/ac-drive-components/; based on suggestions from tex.stackexchange, https://tex.stackexchange.com/questions/395535/some-help-with-connections-and-voltage-arrow-in-circuitikz#395561

% Based on a template by Erno Pentzin (2013), http://www.texample.net/tikz/examples/ac-drive-components/; based on suggestions from tex.stackexchange, https://tex.stackexchange.com/questions/395535/some-help-with-connections-and-voltage-arrow-in-circuitikz#395561

\begin{circuitikz}[lbl/.style = {label={[label distance=4mm]above right:#1}}] % this line defines a new style to alter the distance of labels, mosfets due to diode and transformer label
    \draw 
    % top part of switch legs
    (0,0) coordinate (s1) 
    to ++ (0,-0.4)       
    %node (mosfet1) [nigfete,below,anchor=D] {$Q_1$} % old, label distance incorrect
    node (mosfet1) [nigfete,below,anchor=D,lbl=$Q_1$] {} % new, label distance ok
    (mosfet1) node (mosfet3) [nigfete,right=10mm,lbl=$Q_3$] {} % This is the only variable that needs to be changed to adjust the distance from Q1/Q2 to Q3/Q4
    (mosfet1.S) to [short,current/distance = 0.1,i=$i_{Q,1}$,-*] ++ (0,-0.4) coordinate (t1)

    % transformer
    (t1 -| mosfet3.S) coordinate (hilf1) % Connect Q1 with Q3S which is electrically wrong, but easier to draw  
    node (T) [opacity=0,transformer core,below right=0mm and 17mm]{} % This is the only variable that needs to be changed to adjust the distance from Transformer T from node t1 (underneath Q1)
    (T.base) node[label={[opacity=0]above:$N_1\quad  N_2$}]{}
    node[circ] (E) at ($(T.A1)+(0.35,-0.35)$) {} % Wicklungssinn T
    node[circ] (F) at ($(T.B1)+(-0.35,-0.35)$) {} % Wicklungssinn T

    % bottom part of switch legs
    (mosfet3.S |- T.A2)                             coordinate (t2)  % likewise counter intuitive
    to ++ (0,-0.4) 
    node (mosfet4) [nigfete,below,anchor=D,lbl=$Q_4$] {}
    (t1 |- mosfet4.D)   node (mosfet2) [nigfete,below,anchor=D,lbl=$Q_2$] {}

    % connection lines origins at transformer
    %(T.A1) to                       (t1) % old, replaced by short b/c current arrows, see below
    (t1) to [short,current/distance = 1,i=$i_1$] (T.A1)
    (T.A2) to [short,-*]            (t2)
    (T.B1) to [short]                ++ (0.5,0)     coordinate (t3)            
    (T.B2) to [short]                ++ (0.5,0)     coordinate (t4)

    % connection lines orign at mosfet
    (t1)        to      (mosfet2.D)
    (mosfet2.S) to ++   (0,-0.4)                    coordinate (s2)
    (mosfet3.D) to ++   (0, 0.4)                    coordinate (s3)
    (mosfet3.S) to      (mosfet4.D)
    (mosfet4.S) to ++   (0,-0.4)                    coordinate (s4)

    % supply lines
    (s3) -- (s1) to [short,*-] ++(-1.5,0) coordinate (czk+) to [short,*-o] ++ (-0.75,0)           coordinate (s+) % added *-o, * to get dot at S1
    (s4) -- (s2) to [short,*-] ++(-1.5,0) coordinate (czk-) to [short,*-o] ++ (-0.75,0)           coordinate (s-) % added *-o, * to get dot at S2
    % (s+) to [open, v=60<\volt>, invert] (s-) % old, with SI unit
    (s+) to [open, v=$U_{\mathrm{in}}$, invert] (s-) % new, with variable U_in

    % missing C_ZK inserted

    (czk+) to [C,l=$C_{\mathrm{ZK}}$] (czk-)

    ;
\end{circuitikz}

  \caption[Ersatzschaltbild]{Ersatzschaltbild}
  \label{fig:ersatzschaltbild}
\end{figure}
\end{document}