The TM-D trip unit is a fixed thermal-magnetic type — thermal for overload protection, magnetic for short-circuit. No adjustment dials; you set the protection by picking the right frame. The 160 A rating is the full-load current it can carry continuously without tripping. For a motor load, you'd typically size the breaker at 1.5–2× the motor FLA to handle inrush; for a resistive or distribution feeder, 160 A is the line limit.
Mounts on a backplate in any orientation — horizontal, vertical, or flat. The 81 mm width and 137 mm height fit standard distribution board cutouts. Connection terminals are Everlink lugs accepting 2.5–70 mm² flexible copper or 2.5–95 mm² rigid/stranded — that's a wide wire range for a 160 A breaker, useful when you're pulling parallel feeds or oversized conductors for voltage drop.