It's the kind of disconnect you'd spec into a distribution panel or a motor control center where you need a manual break under load — not a breaker with thermal-magnetic trip, just a straight disconnect switch with a positive break indication.
What the 800 A rating means on the floor
800 A is the continuous current rating — meaning this switch can carry that load all day without overheating in a 40 °C ambient. For a maintenance planner or MRO buyer, that puts it squarely in the feeder or main-disconnect role for a large motor control center or a heavy industrial panel. It's not a branch device; it's the knife that kills power to a whole section of the plant.
The F F in the order code indicates front-mounted terminals and a front-rotating handle, so it's designed for through-panel operation where the handle sticks out the door and the body lives inside the enclosure. That's typical for a disconnect that a machine operator or maintenance tech needs to reach without opening the panel door.