... TTL, HTL, CMOS integrated circuits and etc; While the output loop adopts SCR or GTR to switch on andoff ... It comes with the features of reliable, fast switch, noiseless, long life, compact, no spark, corrosion resistant, explosion-proof, antivibration and ... and many other fields where need the explosion-proof, anti-temperature, corrosion resistant. It becomes the ideal replacements of relay (EMR) ...