Choke AC signal - inductor?

Hi,

We have a switchable signal source. With the switch in position 1
there is an AC signal that fluctuates from 0V to 12V at about 60Hz (it
does not reverse polarity). If the switch is in position 2 the signal
is 12VDC constant.

The signal is connected to a standard electromagnetic relay. We would
like for the relay to turn on ONLY when the 12VDC signal is applied
and NOT when the AC signal is applied. Currently, the relay reacts
fast enough that when the 60Hz signal is applied, it will switch on
and off at 60Hz.

Will this work with a suitable sized inductor in series with the relay
coil? If so, how to calculate the proper size? If not, what is the
best method?

Thank you in advance...
.

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