krp_eee
Newbie level 4
I bought a solid state relay (made of triac with zero crossing detected optocoupler), it turned on/off sine wave AC of Line by 5 volt dc. But it didn't turned off UPS voltage(square wave), it remains always on.
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Yes, this sounds reasonable. A ZC detector SSR doesn't work with square wave. You need at least a sufficient low impedance snubber to reduce dv/dt. But it may not work at all.But it didn't turned off UPS voltage(square wave), it remains always on.