This is the exact part number for a 1250 A frame, typically used in switchboards, panelboards, and as a main or feeder breaker in low-voltage installations.
Procurement note: this is a heavy unit at 6.52 kgs, so factor that into shipping costs and handling for panel build or site delivery.
The 1250 A continuous current rating sets the frame size for feeder and main breaker applications. This is the thermal-magnetic or electronic trip rating — verify the trip unit type and interrupt rating from the full nameplate for coordination studies.