SSW Series are respectively one, two, and three element electronic speed switches. They are powered by a DC battery supply and receive engine speed information from a magnetic speed sensor.
Both the SSW675 and SSW676 sense and signal a low speed setting (CRANK termination) and a high speed setting (OVERSPEED). The SSW676 has a third mid speed setting that can be used for several purposes such as parallel indication, underspeed, or general auxiliary contacts. The single element SSW674 has a wide range of adjustment and can be used for any one of these three functions.