The 25 A continuous rating holds across 40 °C to 50 °C ambient, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C — so in a warm panel you lose about 2 A, not the full rating. The interrupting capacity is the headline: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V.
Built-in undervoltage release and insulation rating
The TM240 release is thermal-magnetic: the thermal element handles overloads (slow trip on sustained overcurrent), the magnetic element handles short-circuit (instantaneous trip above a set threshold). No ground-fault monitoring, no communication function, and no voltage-trigger or trip indicator — this is a straightforward thermal-magnetic MCCB with UVR, not a smart breaker.
That 76.2 mm width is three 25.4 mm pole spacings — standard for a 3-pole MCCB on a DIN rail or panel-mount base. Power loss is 11 W maximum, so heat dissipation is modest — no forced cooling needed in a typical panel.