ThruSwitch vs ThruRelay

Looking in Concert at the ThruPower module options for an ESR rack, there are ThruSwtich modules and ThruRelay modules along with multiple options of for each of those. Is there any document that describes the differences between all of those different types?

I cannot find any documents beyond the Sensor Power Control Modules document, but it doesn't go into great detail.

Also, are ThruPower modules in Dimmer mode natively Reverse-phase, Forward-phase, or auto-sensing? Datasheets just say that it can be a "Dimmer".

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