This is the standard thermal-magnetic protection curve — thermal for overloads, magnetic for short-circuits — common across panelboard and distribution applications where adjustable trip isn't required.
Deployment context
The TMF trip unit is fixed-calibre — no dials or interchangeable rating plugs — so the 125 A rating is set at the factory and cannot be adjusted in the field. This simplifies ordering but locks the protection curve; verify the load's full-load amps match 125 A before committing the BOM line.
Sourcing posture
Because the lifecycle stage is current, this part is sourced through standard ABB distribution. No surplus or broker channel is needed for this order code.