Home Forums Job & Work Life 전자부품에 대한 질문- 옵토 커플러와 릴레이 전자부품에 대한 질문- 옵토 커플러와 릴레이 Name * Password * Email In general cost is the primary concern and SSRs tend to be bigger in size too. If you spec for SSR that can do 10A 250VAC, it will be around $50 a piece. Mechanical relays are much cheaper, probably in the order or few bucks. Optocouplers used there are also cheap. For certain applications, typical SSRs are not applicable. E.g. RF switching. I agree to the terms of service Comment