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It depends whether your contactor has one coil or two coils already built in.
Some GIGA units have 2 coils, pull-in and hold, and they use a timer to turn off the current to the Pull-in, which just leaves the hold coil doing its thing.

The economizer circuit can also be done using PWM for a single coil version, and this can be either current or voltage regulated. It does create electrical noise that might interfere with other circuitry.

In any case you will want to know or measure the R and L of the coil(s) that you will be driving so you can try to match the output parameters of the drive amplifier to the load parameters (e.g. impedance).

there are good discussions here on this site, searching coil economizer circuit.
 
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