Its 1000 A rating at 40 °C (derated to 900 A at 70 °C) sets the continuous current it can carry without tripping on overload — sized for high-current feeders or large secondary mains. The 187 kA interrupting capacity at 240 V AC (121 kA at 415 V, 52.5 kA at 690 V) tells you the maximum fault current it can safely clear without rupturing; that 187 kA figure at 240 V is well above typical utility fault levels, meaning this breaker can handle high-available-fault installations without cascading upstream.
Thermal derating and enclosure integration
The 330 W maximum power loss means the enclosure must dissipate that heat — plan for ventilation or a larger cabinet if the breaker runs near its rating in a sealed panel. Dimensions are 320 mm height × 210 mm width × 120 mm depth (12.6 × 8.27 × 4.72 in), a 3-pole frame that fits standard MCCB cutouts. The TM240 release is thermal-magnetic — thermal element for overload, magnetic for short-circuit — with a trip indicator for quick fault identification.
Rated insulation voltage 800 V.