The Siemens 3VA1063-4ED36-0BA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 3-pole unit rated 63 A continuous at 40 °C with a TM210 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). The key spec for a sourcing decision is the interrupting capacity: 121 kA at 240 V, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V. That means it handles high-fault scenarios at lower voltages but derates significantly above 500 V, where it holds at 11.9 kA.
Breaking capacity and thermal derating
At 415 V — common in European industrial panels — the 75.6 kA rating means this breaker can interrupt faults up to that level without cascading upstream. That's high enough for most secondary distribution boards fed from a transformer. The thermal derating is mild: it holds 63 A up to 50 °C, then drops to 62 A at 55 °C, 61 A at 60 °C, and 58 A at 70 °C. So if your panel runs hot (say 55 °C ambient), you still get 62 A — not a derating cliff.
Physical fit and integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. That's a standard MCCB footprint for a 3-pole 63 A frame — fits most DIN-rail or panel-mount enclosures without surprises. The undervoltage release is built in, so no auxiliary module needed for that function. The TM210 release is thermal-magnetic, fixed-trip, no electronic adjustment — set it and forget it.