This MCCB delivers 187 kA breaking capacity at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. At 415 V, 121 kA covers most industrial secondary substations and large motor control centers without needing upstream current-limiting fuses. The 17 kA rating at 690 V is adequate for 690 V drives and mining applications.
Thermal derating — real-world current capability
Rated 63 A from 40 °C through 50 °C ambient; at 55 °C it derates to 60.48 A, at 60 °C to 59.22 A, at 65 °C to 57.96 A, and at 70 °C to 56.7 A.
Physical fit and auxiliary wiring
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — standard SENTRON 3VA2 frame footprint for 3-pole 63 A units.