You will find that this unbranded relay fits standard sockets, and the metal tabs feel secure and nicely finished.
Solid State Relay for Mager TSR-40DA MGR-3 032 3840Z DC-AC Three-phase 380VAC
A nice touch is the smooth spring action inside this unbranded relay, which feels reliable without being too stiff.
A nice touch is how the unbranded brand uses a bright indicator LED, so you know at a glance when it's active.