What the description tells a panel builder
The 1SDA076406R1: The "DC 3P" in the description flags this as a DC-rated three-pole switch — the poles are arranged for DC interruption, which typically means series-connected arc chambers to handle the sustained DC arc. On a DIN-rail or backplate mount, the T8V-D frame footprint matches the standard ABB Tmax moulded-case breaker cutout, so it swaps into an existing panel layout without re-drilling the gland plate. The UL/CSA mark is the one the inspector looks for on the nameplate; without it, a DC disconnect in a UL 508A panel gets a red tag.