I'm guess by that you mean a repair kit
They may do a repair kit? The energiser coil is where you apply power to the contactor and it closes it, so that your mains power then runs through the unit. Most contactors allow this to be swapped out as it wears out quicker than the unit. A good one will work at a much lower voltage, you could try a 12v supply just to see if the contactor moves? no guarantees