What it is and what it does
The Siemens SENTRON 3VA1063-4ED32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A at 40 °C, with a TM210 thermal-magnetic overcurrent release. It's built for line protection in distribution panels — the 121 kA breaking capacity at 240 V gives you headroom for high-fault installations where standard MCBs would weld shut.
Key ratings and what they mean for fit
The 63 A rating holds flat from 40 °C to 50 °C, then derates to 58 A at 70 °C — so in a warm panel you still get full current up to 50 °C. The 121 kA interrupting rating at 240 V is the headline number, but at 415 V it's still 75.6 kA, and at 690 V it drops to 11.9 kA. That matters if you're coordinating with downstream breakers in a 480 V system: the SCCR at 415 V is well above typical utility fault levels. The TM210 release is a standard thermal-magnetic curve — no electronic adjustment, no communication, no voltage trip. It's a workhorse for fixed-load feeder protection.
Panel fit and integration
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm tall — that's a 3-inch wide footprint, so it fits standard Siemens SENTRON mounting bases. Three poles, no auxiliary switch or undervoltage release fitted as standard (the base switch carries provision for up to 3 auxiliary switches HQ). No communication module, no ground-fault monitoring — it's a straight thermal-magnetic MCCB for basic feeder protection.