That TM240 designation means the thermal trip element is fixed at 100 A (the frame rating), and the magnetic short-circuit pickup is adjustable up to 240 A (12x the Ir rating on the TM release family). This is the breaker you spec when you need a 100 A feed with a moderate magnetic pickup range for motor or distribution duty.
This breaker carries a 75.6 kA interrupting capacity at 240 V AC, dropping to 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V and 690 V. Those are the maximum fault currents it can safely clear at each voltage level.
Above that, it steps down: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C.
Physical fit — panel dimensions
The 76.2 mm width (3 inches) is standard for a 3-pole MCCB in this frame class; it occupies three 25 mm DIN spaces if mounted on a DIN rail adapter, or bolts directly into a panel with the supplied mounting pattern.