Soft-start circuit simulation
This is a simulation of the soft-start circuit as recommended by G3SEK for use with the control card. I have reduced the value of the series capacitor to 2k ohm for use with the selected +24 volt relay that has a coil resistance of 445 ohm and minimum latching voltage of 19.2 volts. This configuration provides a delay of just under 1 second. Rerunning the simulation for 120v gives a resistor value of 1k ohm (as one would expect!).