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summary
In summary, SSRs use a photo detector to drive an output MOSFET to optically isolate circuits which operate from independent power sources of differing voltage levels. Some of the features and benefits of SSRs include a bidirectional MOSFET which supports both AC and DC switching, no possibility of thermal runaway since there are no bipolar elements, and the ability to switch low to high-voltage signal levels or an AC/DC load current.
PTM Published on: 2009-03-27