This component models any series combination of variable R,L and C elements, and can be connected to single-phase or single-line, 3-phase wires or components. If the Variable Series Impedance Branch is configured to have neither R, L nor C elements, then it will be modeled as an open-circuit branch. Negative R, L and C values are ignored and the previous non-negative value is kept. If the L value is less than 1e-20 (H) or the C value is less than 1e-20 (mF), then the respective element will be removed. If the R value is less than the ideal threshold, then resistive portion of the branch is considered to be a short-circuit.
It should be noted that it is more efficient to use the individual Resistor, Inductor or Capacitor components or the Runtime Configurable Passive Branch component if the application does not warrant dynamic changes to R, L or C.