The XT1SU3045AAA000XXX: The description XT1S 125 TMF 45-500 3P F F UL/CSA breaks down as: XT1S frame size rated 125 A, TMF 45-500 thermal-magnetic trip unit adjustable from 45 A to 500 A, 3-pole, front-front terminals (line and load connections both at the front), and UL/CSA listing for North American panel applications. The TMF trip provides both thermal overload and magnetic short-circuit protection in a single unit.
Panel integration
The XT1S frame is designed for DIN-rail mounting or direct panel mounting via screw terminals. Front-front terminal orientation simplifies busbar routing in switchgear assemblies. The 3-pole configuration covers three-phase loads; the UL/CSA listing means it meets North American code requirements for branch-circuit protection.
