What this MCCB delivers — and what it doesn't
The Siemens SENTRON 3VA1063-3ED42-0BC0 is a 4-pole molded case circuit breaker rated for line protection, carrying a continuous current Iu of 63 A through its TM210 thermal-magnetic release. At 240 V it interrupts 75.6 kA, at 415 V it handles 52.5 kA, and at 440 V it clears 32 kA — numbers that tell you this breaker is sized for high-fault panels where a standard MCB would weld shut. The 800 V rated insulation voltage (Ui) gives headroom for 690 V line-to-line systems, though the interrupting rating at 690 V drops to 7.5 kA, so verify the available fault current if you're pushing that voltage class. This version includes an undervoltage release (UVR) and two HQ auxiliary switches. It does not have a voltage trip, phase-failure detection, ground-fault monitoring, or any communication module — it's a straightforward line-protection breaker, not a multifunction power monitor. The front face carries IP40 protection, fine for a clean indoor panel; keep it out of washdown zones. Dimensions are 70 mm deep, 101.6 mm wide, and 130 mm tall — a 4-pole footprint that fits standard SENTRON mounting rails. The latching endurance is rated at 15,000 operations, which covers routine switching without wearing out the mechanism prematurely.
Thermal derating — the real-world current you can actually run
The 63 A rating holds flat from 40 °C through 50 °C. 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. If your panel ambient sits above 50 °C — say a sealed enclosure near a furnace line — you lose roughly 0.6 A per degree. Plan the load accordingly; the breaker won't trip early, but you'll be running it above its calibrated thermal curve.
What the TM210 release means for coordination
The TM210 designation indicates a thermal-magnetic release with a fixed thermal pickup and a magnetic short-circuit trip set at 10× Iu (630 A). That's a standard curve for motor-circuit or distribution feeders where you want the magnetic element to ignore inrush and only clear hard faults. For selective coordination downstream, pair it with a breaker whose instantaneous trip is below 630 A; upstream, ensure your main has a higher magnetic pickup or a short-time delay.