The TM-D trip unit combines a thermal element for overload protection (inverse-time, responding to I²t heating) and a magnetic element for short-circuit protection (instantaneous above a calibrated threshold). It is rated 25 A at 40 °C ambient; if your panel runs hotter, you derate per the manufacturer's curve. Mounting is on a backplate (not DIN rail), so plan for a drilled or tapped panel and lug connections. The Everlink terminals accept 2.5–95 mm² rigid aluminium/copper or 2.5–70 mm² flexible copper — sized for the 25 A rating but with headroom for larger conductors if the run is long. The 9-module pitch (9 x 9 mm = 81 mm width) fits standard enclosure cutouts for ComPacT NSXm frames.
The breaker mounts horizontally or vertically flat on the backplate — orientation does not affect the 50 kA rating, but vertical mounting improves natural convection for the thermal trip. Connections are front-facing on both line and load sides, which simplifies busbar or cable routing in a panel. The Everlink lug uses a single screw clamp; strip length and torque values follow the manufacturer's installation sheet. Power dissipation is 2.8 W per pole at rated current — 8.4 W total for the three poles. That matters for thermal management inside a sealed enclosure; add it to your heat load calculation to avoid nuisance tripping from elevated ambient temperature.