The reason I did not use a diode was that I read somewhere it was not needed and could actually damage the KiloVac EV200AAANA contactor with the built in economizer circuit. The specs sheet says: "Built-in coil economizer – only 1.7W hold power @ 12VDC and it limits back EMF to 0V. Models requiring extenal economizer also available."
Amin
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