63 A MCCB with 220 kA interrupting capacity at 240 V
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. The rated insulation voltage is 800 V. 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.
Thermal derating and panel fit
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. If your panel ambient runs above 50 °C, you're leaving about 5 A on the table. The body is 70 mm deep, 76.2 mm wide, 130 mm tall — standard 3-pole MCCB footprint for a 63 A frame. It mounts on a DIN rail or panel plate; the 19.8 W max power loss means you need some ventilation if it's in a sealed enclosure with other heat sources.
Built-in undervoltage release and auxiliary switches
This variant ships with an undervoltage release (UVR) integrated — it trips the breaker if control voltage drops, which is common on safety circuits or emergency-stop chains that need a drop-out on power loss. It also carries two auxiliary switches plus one trip alarm switch (HQ type), so you get remote status on open/closed and fault-trip without adding a separate accessory block. The trip indicator on the front gives a quick visual that it tripped on fault vs. manual off.