What the TMF trip means on the line
The XT1HU3060AFA000XXX: Thermal-magnetic trip block with a 60-600 A adjustment band on a 125 A frame. Thermal element handles overload; magnetic element handles short-circuit.
Panel fit and mounting
The XT1 series mounts on a DIN rail or direct-panel via screw terminals. Three-pole, fixed-configuration — no plug-in base needed. The fixed thermal and fixed magnetic settings mean you set the trip at commissioning and lock it; no field-adjustable dials to drift. For a panel-builder, that's one less thing to verify on the FAT. Terminations accept copper or aluminum conductors up to the frame's rated size.