This is the core overcurrent protection device for a distribution panel or motor branch circuit — the TMF characteristic gives you fixed thermal and magnetic pickup, no field-adjustable dials, so what you order is what protects the circuit.
The XT1N series is a compact molded case design for panelboard or enclosure mounting; it coordinates with downstream ABB S-series miniature breakers for selective coordination when the fault current stays within the XT1N's interrupting rating.
Deployment context
Mounts in a standard distribution panel or motor control center enclosure — the XT1N footprint fits ABB's modular busbar system and accepts plug-on accessories (auxiliary contacts, shunt trip, undervoltage release) without extra wiring. For a panel OEM, the fixed TMF trip means one less adjustment step on the assembly line; for an MRO planner, it means the spare part is identical every time you reorder.