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The relay is one of the world’s oldest electrical components. Industrial engineers must understand how to identify, control, and troubleshoot all kinds of electrical relays.
Electrical control systems rely on solid-state and mechanical relay devices to manage the logical flow of operations and to amplify power from the control to the load circuit. During design and operation, relays must be thoroughly understood in order to bring about the best results, both for the reliability and the longevity of the machine. In this ebook, learn how to identify various types of relays, read the terminal numbers to understand wiring, and discern between the risks and benefits of choosing certain relays for mission-critical applications.
Helpful info. Thanks alot
Buried deep within the article is the first question you need to ask when choosing between SSR and mechanical. Can you tolerate a leakage current? An SSR is never totally off.
An SSR has much longer life but at a cost of some leakage current. I have often wondered why no one makes a hybrid relay. When controlling electric heaters, I have several times had to build one. The SSR for the high cycle life when running the heater and a mechanical one so I could turn it completely off.