Arduino hangs when connect 220VAC to COM and NO contacts on relay

Using Arduino Motors, Mechanics, Power and CNC
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pardon my ignorance i'm all new to this :slight_smile:

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please take note that the diodes before the optocouplers and after them are not diodes these are resistors , i had to put them as diodes becuase the resistors i have found are so wide so i put them as diodes for spacing . the diodes before the leds are also resistors . i have labeled them write

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70VA @ 220V is about 320mA, that's a big coil, you definitely need AC snubbers, MOVs or bidirectional TVS diodes of the correct voltage and capacity.

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so a snubber across the contact of the coil (A1 and A2) or the contact of the relay ( COM and NO ) ?

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so what type of relay are you recommending ??

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