Solid state relays can switch everyday mains-powered devices like lamps, but there’s danger inherent in working with household AC voltage. Victor wrote a tutorial on how to enclose the SSR in an old laptop power supply case. It’s simple to build, and it keeps you and your fingers safer than a bare board.
For a number of my upcoming projects I need a rig to test the functionality of a solid state relay that would be driven by a microcontroller and switch the mains for other devices. Having done projects with similar requirements in the past I remembered how much pain it was to test the solid state relay (SSR) with naked mains cables running around, etc.