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A normally-off type SSR (which is functionally the same as a “make contact” mechanical relay) leaves the output terminals open if there is no input signal, and short-circuits the output terminals if an input signal above threshold level is applied. Conversely, a normally closed type SSR (which is functionally the same as a “break contact” mechanical relay) keeps the output terminals short-circuited if there is no input signal, and opens the output terminals upon correct application of an input signal.
PTM Published on: 2009-03-27
