A-causal bonds must mostly be used here, because the causality depends on the embedding of the switch in its environment. A leaking switch has been used to ensure that the switch will not lead to a division by zero in either switch position, irrespective of the circuit topology.
Parameters: level: Potential threshold for switch control (default value = 0.5 Volt) Ron: Leakage resistance in on state (default value = 1e-5 Ohm) Goff: Leakage conductance in off state (default value = 1e-5 Mho)