That derating curve means you can push this into a hot enclosure without oversizing.
What this disconnect does — and doesn't do
This is a straight switch disconnector — no overload protection, no short-circuit protection. It's meant for isolating a circuit under load, not for protecting it. The main circuit connects via busbar connection with front terminals, so you're looking at a solid copper bar drop, not wire lugs. That's enough to signal position back to a PLC or light a panel indicator. It's a bare-bones disconnect — reliable, simple, and built for the long haul with a mechanical life of 15,000 operating cycles.
Footprint is 70 mm deep, 140 mm wide, 158 mm tall (–). That's a four-pole unit taking up about five and a half inches of DIN-rail width. Front IP40 protection keeps tools and fingers out but isn't rated for washdown — keep this inside a closed panel. Maximum power loss is 57 W, so factor that into your enclosure heat budget.