How do i know which switch should i use in Simulink?

How do i know which switch should i use in Simulink when i am trying to design an electrical circuit using Simscape(because the Simulink signals and the Simscape are different and i need to convert them)

In a simple relaxation oscillator circuit , the neon lamp fires when its voltage reaches 75 V and turns off when its voltage drops to30 V. Its resistance is 120 Ohms when on and infinitely high when off. I have to figure out

(a) For how long is the lamp on each time the capacitor discharges?

(b) What is the time interval between light flashes?

And i am trying to simulate the neon lamp using two switches but i have a problem with the signal conversion

Answer 1

[Steve Miller]

To use Simulink signals to control inputs to Simscape blocks, you often need this converter block

https://www.mathworks.com/help/simscape/ref/simulinkpsconverter.html

This is how Simulink knows where the boundary is for the sets of equations to solve simultaneously (implicit equations) versus one block after the other (explicit equations).