Solid state relay - the modern method of switching mains

olid state relays elektor june 1982 — 6-57 solid state relaYs the modern method of switching mains Electronic relays have quite a lot of advantages over their conventional electro/mechanical counterparts; they don"t spark, wear out as quickly, cause less or interference, and they require a control current of only a few milliamps. Even so, compact solid state relays are extremely rful. The ability to handle up to 8 A is not at all unusual. Solid state relays perform in exactly the same manner as conventional mechanical relays, but, as their titel would suggest, contain no moving parts. However their design is a little more critical if long term reliability is to be achieved. The solid state relay (SSR) to be described here can be used in complete safety as the control circuit is totally isolated from the load. More- over the control voltage can be varied over a wide range which is more than can be said of its mechanical counter- part. The pros and cons It can be considered that t...