Mains Switching interference.

[wp100]

Hi,

Have a board with small mechanical 6A relays driving mains loads at quiet low currents from 4 w to 50w, both simple resistive loads and inductive loads. ( at 230vac)

Problem is that their switching is occasionally affecting the controlling Pic, which already has various mains and dc filters on its board /psu.

While I could add on main suppressors and varistors etc to the relays wondered if using 2A zco solid state relay modules would overcome the problem or would they also need extra supressors in addition to its inbuilt snubber ?

thanks

 

[pwdixon]

If you zero voltage crossover solid-state switches there shouldn't be any switching transients.

 

[andre_luis]

More details about this circuit and pcb layout are needed in order to us provide a more precise advirsement.
There are many reasons to that.

Anyway, in most cases, a simple bypass suppressing capacitor could be enought to improve spike filtering.


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