skimask,

A quick look at the datasheet would have shown that the ULN2004 does have Output Clamp Diodes. Datasheet boy.

Joel,

Maybe you need a snubber on the relay driving the contactors coil.
I use .022uF 400V and a 47ohm 1/2w resistor in series across the output, but then I'm using SSR's

Works good for all the contactors I've used.
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