The Siemens SENTRON 3VA1163-6EF36-0CH0 is a 3-pole molded case circuit breaker rated 63 A continuous at 40 °C, with a 220 kA interrupting capacity at 240 V — that's the number that decides whether it clears a fault without the upstream transformer tripping. At 415 V it still holds 154 kA, at 440 V it's 121 kA, and at 500 V or 690 V it drops to 17 kA. This is a line-protection design, not a motor-protection breaker — it's sized for feeder or main incoming duty where you need the high fault current withstand.
The 63 A rating holds flat from 40 °C through 50 °C, then drops one amp per 5 °C step: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, 58 A at 70 °C. The body is 70 mm deep, 76.2 mm wide, 130 mm tall — standard 3-pole MCCB footprint for a 63 A frame.
Built-in undervoltage release and auxiliary switches
The trip indicator on the front gives a quick visual that it tripped on fault vs. manual off.