Electromechanical relays have several advantages over solid-state relays. They are usually less expensive; they are more flexible because they require less current sink from the digital I/O board; and they are smaller, so they can be packaged to take up less space. Relays have their drawbacks, however. They can arc or surge when used with devices carrying an inductive load (such as motors), and they don't offer the same optical isolation. Important: When using CYERB for switching inductive loads, use the newer CYDO output only boards, which cannot be reset by the "inductive kick."
The digital I/O lines to the CYERB are pulled to a steady state by circuitry in the board so they do not randomly open or close on power-up.
Note: Our CYERB 48L-5PK and CYERB 48SL-5PK are special order, for a pack of five relay panels. (If you need more than five, please call.) Leadtime approximately 8 weeks. Sorry, no returns on these items.