Testing Tyco Kilovac EV200A1ANA coil with 12V Battery

So this new Tyco Kilovac EV200A1ANA contactor requires an economizer to avoid coil overheating and getting damaged

Talking a lot on the phone and by mail about it with my dad, he told me to see if the coil was realy overheating and that is what I did using a small 12V AGM battery as a 12V source and also wired an ampmeter - in series - to see the current going in 

3,5A showing here and 3A after few minutes

Not showing on this picture but the temperature went up to 30°C when I left the power - 12V @ 3,5A - on the coil leads for more than 5 minutes, so it is getting warm and consuming some power - 36W or more -

I am still reading einteresting stuff online to make a simple economizer with a simple resistor and a capacitor ,in parallel, wired in series with the coil : http://www.diyelectriccar.com/forums/showthread.php/evdl-coil-economizer-13711.html 

Opening up the Tyco Kilovac EV200AAANA Economizer box

Saturday morning I decided to open up the Economizer box attached to the Tyco Kilovac EV200AAANA to see what this PWM circuit is made of; So I started by unscrewing the voltmeter and then the contactor
from the control board after taking the battery cables off its terminals


After that it was easy to remove this side box/cover

voilà

and here is the Tyco Economizer: it is actuelly a small PCB with 3307 reference number printed on it: KILOVAC 3-70-3209

and there are quite a few components soldered onto it !