Help to connect SSR

[nitin100]

I believe that all SSR have input circuitry - and the current required is less than 10ma.
 
What is a catch diode? Automotive industry uses capacitors to remove the transient spikes. A battery is a VERY big capacitor which usually absorbs transients.
 
We have actually drifted from the main topic. I doubt that so much is required just to drive a simple relay.

 

[LarrylLix]

What is a catch diode? Automotive industry uses capacitors to remove the transient spikes. A battery is a VERY big capacitor which usually absorbs transients.

"Counter EMF diode". A diode place across an inductive element reverse biased to the normal polarity, Inductors do not like to have changes in current and "kick back" a high voltage in an attempt to keep the current flowing. Like an electronic inertia.
 
I have never heard the term "catch diode" before, either. Clamper, clamping, reverse bias etc...
 
 Capacitors only stretch out transients by reducing the magnitude and increasing the length of time. No energy is absorbed.
 
Batteries are not good transient absorbers. This is why large capacitors are often parallelled with smaller capacitors. Large capacitors can act as inductors with their foil wound construction.

 

[Tschmidt]

"Counter EMF diode".

That is the correct term. I thought it might be confusing so used the term "catch diode" - sorry for the confusion.
 
/tom