I opted for 240AC, as the 24VDC supply I bought is only about 2A, and most (cheaper!) contactors seem to need 2A to pull in.If you decide to go 24v dc give me a shout, I have quite a few of various sorts left over from a job. (No 24v ac though, I’ll have a check but I don’t think they are ac/dc rated) I’ve got loads of terminals kicking around too too!
Even if I went for the PLC compatible contactors, they need ~500mA, and the controller can only handle 250mA, so I'd need to use some form of interface relay anyway, which means there's no real benefit to going 24VDC and it would cost me a bigger 24VDC PSU.
I've opted for 2 4pole contactors, so I can have a power on delay to avoid all the drives/VFDs powering up at once.
Off course, I could have just went for a few big relays, but DIN rail mounted ones capable of switching several KW rated drives don't work out that much cheaper than contactors.