appears to be what I need but lacks any data on the technical side, like what size wire will it handel, voltage and current capabilities

I use this as an iverter cut-off switch in a small off-grid home solar electric system. It is mounted on the wall behind the inverter, and connected to the positive terminal of the battery bank and the positive terminal of the inverter. It is built like a tank, so to speak, very high quality. I use it only to cut all power to the inverter, as most inverters in solar power systems still drain some power from the batteries, even when the inverter switch is "off." It works! Easy to install! I'm delighted with this switch. (How can you be delighed with a switch? I don't know, but I am!!)

Used this switch for a battery upgrade in an RV. Like the compact size. Current handling capability is more than ample for my application. Switch has a quality feel to it.

We prefer this products solid contrcution and screw down lugs.