If it's a "SIEMENS", there is a 99.9999999&4/10%certainty it's selenium. replace it with a 400v 4A silicon bridge. You'll need to add a dropping resistor afterward to compensate for voltage drop of the selenium.
I think that is just a spike supressor, a very high voltage disc capacitor. (This was supposed to have been posted hours ago. Unfortunately, it stayed as a draft, sorry.)I've decided the big orange thing is a thermistor by MuRata Electronics. I can't find the thermistor in the picture, but the "m" inside the "C" seems to be a MuRata symbol. Unfortunately I cannot determine from the markings how much thermal protection there is.