\documentclass[]{article}
\usepackage{circuitikz}
\input{tikzsubimage}% requires expkv-cs and \str_if_eq:nnTF from expl3
\tikzsubimagedef\divider
[% key=value setup; the key 'anchor' is always defined
sep=2
,sym1=R
,sym2=R
,label1=~
,label2=~
,gnd=tlground
]
{% default (relative) position of pseudo-anchors
in={0,0}
,out={\ekvcValue{sep}{#1}+.5,0}
,j={\ekvcValue{sep}{#1},0}
,gnd={\ekvcValue{sep}{#1},-\ekvcValue{sep}{#1}}
}
{% code to draw the subimage