Opto 22 G4 series modules are still an excellent choice for basic industrial sensing, control, and ladder logic applications. One should never argue with the simplest and most venerable of solutions, and after over 30 years of availability in the industry, we still like this one.  These simple modules offer easy sensing and switching as

Wurth Electronics SMT flat wire high current inductors offer impressive energy density and low loss performance. Allied Component Works regularly addresses designs requiring advanced magnetics to achieve maximum density and efficiency in power electronics. The Wurth Electronics WE-HCI series are fixed inductors with a somewhat improbable design that has provided impressive performance in recent applications.