https://www.epanorama.net/blog/2019/02/11/phoenix-contact-ssr-teardown/ All about electronics and circuit design Mon, 20 Apr 2026 05:05:07 +0000 hourly 1 http://wordpress.org/?v=3.9.14 https://www.epanorama.net/blog/2019/02/11/phoenix-contact-ssr-teardown/comment-page-1/#comment-1869233 Sat, 24 Jan 2026 11:47:50 +0000 http://www.epanorama.net/newepa/?p=181379#comment-1869233 https://www.phoenixcontact.com/en-pc/products/solid-state-relays-st-ov2-12dc-60dc-1-2905022

]]> https://www.epanorama.net/blog/2019/02/11/phoenix-contact-ssr-teardown/comment-page-1/#comment-1625173 Wed, 13 Feb 2019 08:48:34 +0000 http://www.epanorama.net/newepa/?p=181379#comment-1625173 The output circuit has somewhat interesting circuitry that goes to base of optoisolator output transistor.
My quess on the output circuit is there to introduce some hysteresis to the circuit operation (similar to electro-mechanical relays), meaning that when the control that turns on the output is reaches, the drive needs to be considerably lowered to to turn the output off again.

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