Allows double switching of double conductor.
Switching by forced change of current-voltage ratio.
'closed' and 'open' determine the mechanical switch-position.
Electrically the switch is on if it is 'closed', whereas
the currents start decreasing exponentially, when it is opened.
The transition between the 'off' conductivity (epsG) and the 'on' resistivity (epsR) is continuous with an exponential relaxation function
f = (exp(-dt^p/2) - exp(-1/2))/(1 - exp(-1/2))with
dt relative time measured from switching instant t_relax relaxation time p power of exponent