Hello, I have some of these SSRs, http://www.mouser.com/Search/ProductDetail.aspx?qs=8ehJfnwBfpTEixK6L1K8TA%3D%3D. Looking at the datasheet here, http://www.crydom.com/en/Products/Catalog/s_1.pdf I have a few questions.
What does "Zero-crossing (resistive loads) or random-fire (inductive loads) output" mean?
And it says, "Typical Input Current 3.4-20 mA" and "Nominal Input Impedance [Ohms] 1500 Ohm". Does this mean I could omit a current limiting resistor as the internal impedance would limit it to 3.3mA (5v/1500?=3.3mA)?
I have also been reading that a snubber is not needed for SSRs. Will someone confirm or give argument otherwise?
Finally, is something like this safe to control directly from an output pin or should I use a transistor to switch it?
Thanks for your time,