What this 630 A MCCB carries
Its interrupting capacity hits 242 kA at 240 V and still holds 187 kA at 415 V and 440 V — that's the kind of fault-clearing muscle that keeps a 400 V bus from cascading upstream when a bolted fault hits.
Thermal derating curve — the real continuous rating in a hot panel
The 630 A rating at 40 °C is the headline number, but inside a sealed enclosure at 50 °C you're looking at 593 A, and at 60 °C it drops to 557 A. At 70 °C ambient the breaker is good for 520 A continuous. That's a 17 % reduction from the 40 °C figure — plan your fill factor around the worst-case ambient, not the catalog max.
The breaker measures 248 mm high by 138 mm wide by 110 mm deep. The width at 138 mm means it occupies three 45 mm pole spaces on a DIN-rail adapter plate, standard for a 3-pole MCCB this size.
Maximum power loss is 162 W at rated current. In a sealed stainless enclosure at 50 °C ambient, that heat load drives the derating curve above.