"It needs to be rated at least 30 amps 12 volts DC and be able to delay starting for one to two seconds."
If you can tolerate a delay before the relay opens, the brute force method is to hang a large capacitor across the coil terminals with a resistor in series with the wire driving the relay coil.
R(ohms) x C(farads) = Time Constant(seconds)
My guess is that you will need about 1 to 2 time constants to reach the pull in voltage of the relay. So R times C should equal about 1. Try 20 ohms at 2 Watts and 47,000 uF at 63 VDC.
LarryC
