smart home

Hello all, I want to ask do I need to put the capacitor provided in the install action kit of wifi smart switch(with touch sensor, without neutral wire terminal) if I am not using LED bulbs, but just some ordinary bulbs? I had the same switch for 2 weeks. I installed it without the capacitor...

I have a cable that is controlled by 3 miniature circuit breakers (it's separate into three parts). Now, I have a remote controlled relay that can't handle the high current (it's a three phase cable and I don't know exactly how high it is). Basically, I want to turn it off and on remotely but...