Line protection breaker with high interrupting capacity
That thermal stability means it holds its rating across typical panel internal temperatures without oversizing. Breaking capacity is the headline number here: 75.6 kA at 240 V, 52.5 kA at 415 V, and still 32 kA at 440 V. For a 40 A frame, those are high-interrupt ratings — the breaker can clear a bolted fault on a large transformer secondary or a motor-control center bus without upstream fuses. No communication module or ground-fault monitoring is fitted on this variant.
Mounting is via rear DIN rail or screw-mount plate. Maximum power loss is 13.3 W at rated load — negligible for thermal management in a ventilated panel, but worth noting for sealed enclosures where internal temperature rise must be calculated.