I'm relatively new to working on hardware projects, albeit I have years and years of software experience. I've started retrofitting an electric bike I have to make it "smart". It uses a 60v battery and the entire system is 60v, including the key'd on/off switch. I'd like to start simple by just figuring out how to drive the on/off switch with my 3.3v microcontroller that is rated at a max output of 800ma. Is this possible? I've started reading about MOSFET's for this situation but it's all a little blurry. I've done a lot of work in automotive electrical systems so an obvious solution for something like this seems like it'd be a relay of some kind that uses 3.3v to close the 60v circuit but this seems like too big of a difference for any relay I can find?
Any help & pointing me in the right direction for where to look & learn to drive this switch with low voltage would be extremely helpful. Thank you!