The TM240 thermal-magnetic release handles the overload and short-circuit trip curves, so there's no electronic fiddling on site — set it and forget it. Breaking capacity is where this part earns its keep: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V. For a line-down spare, that's the kind of margin that keeps selectivity intact.
Thermal derating — it matters in a hot panel
At 55 °C it's 30.72 A, at 60 °C it's 30.08 A, at 65 °C it's 29.44 A, and at 70 °C it's 28.8 A. If your panel sits near a furnace line or a compressor skid that pushes ambient over 50 °C, size the load accordingly — the breaker won't nuisance-trip, but you lose about 3.2 A by the time you hit 70 °C. That's a real factor for a continuous process like injection molding where a 30 A motor load is the norm.
Built-in trip options
It's a straight-ahead line protection breaker with a remote trip coil for emergency-off or interlocking circuits.