Its interrupting capacity hits 75.6 kA at 240 V and 52.5 kA at 415 V — numbers that govern selectivity coordination in a distribution panel.
Thermal derating and the TM240 release
The 63 A rating holds flat from 40 °C to 50 °C, then derates to 60.48 A at 55 °C and 56.7 A at 70 °C. That means a panel builder can size the breaker for a 63 A load at 50 °C ambient without headroom, but above that the TM240 release's thermal element will track the ambient curve — plan the enclosure's internal temperature rise accordingly. The TM240 designation means the thermal trip is fixed at 240 A (the short-time pickup), not adjustable; the magnetic instantaneous pickup is factory-set per the release curve.
Interrupting capacity across voltage levels
Breaking capacity is voltage-dependent: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. A site electrical engineer sizing for a 480 V panel should use the 440 V figure (32 kA) as the conservative reference for coordination studies — the 690 V number covers the uncommon case of a 690 V distribution bus.