It is a 3-pole, front-connected (F F) design with UL/CSA approvals, rated for panelboard and switchboard installation in North American and global industrial power distribution. The TMF trip unit provides fixed thermal protection (for overload) and adjustable magnetic protection (for short-circuit), letting the site electrical engineer coordinate the breaker with downstream loads without swapping trip units. The 200-2000 A magnetic adjustment range covers motor starting inrush and transformer energization while still clearing hard faults.
The 3-pole front-connected design mounts directly into UL 891 switchboard or UL 67 panelboard bus stacks. The TMF 200-2000 A magnetic adjustment dial is accessible from the front without removing the cover — useful for field-service techs re-coordinating after a load change. UL/CSA listing covers North American installations; the XT4H series also carries IEC 60947-2 ratings for global projects. Compliance documentation (RoHS, REACH, UL file, IEC test reports) is available from ABB upon request — quality-doc-control should request the declaration of conformity with the PO.