63 A MCCB with ETU320 — high interrupting capacity for line protection
The interrupting capacity is the headline: 187 kA at 240 V AC and 121 kA at 415 V AC, dropping to 79 kA at 500 V and 4.25 kA at 690 V. Thermal derating is gradual: the breaker holds its full 63 A rating up to 50 °C ambient, then tapers to 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C. In a crowded panel with elevated internal temperatures, that derating curve lets you plan the actual load without oversizing.
Integration — panel fit and auxiliary contacts
No auxiliary release is fitted, so external shunt or undervoltage coils would need to be added separately if required.
With 20,000 mechanical/electrical endurance cycles and the ETU320's adjustable I²t curves, this breaker coordinates well downstream of a larger SENTRON 3VA or upstream of 3RV motor-protective breakers.