PCB and DIN-Rail SSRs offer numerous features from which benefits may be obtained. The key features of these, and other SSRs, are quiet operation and long life. If applied properly, solid state relays will last significantly longer and are more reliable than electromechanical relays (EMRs). In most cases, with an SSR, customers can benefit from ten times the life of an EMR. Optical coupling of these products provides excellent input to output isolation. The inverse parallel SCR output is well suited for inductive load switching, and the low leakage current permits reliable control of low current loads. The integral heat sink on the SSRF, SSRK and SSRM products eliminates the need for an additional external heatsink.